1st quadrant Galactic SNRs (0°<l<45°)


G0.0+0.0 ADS: search fulltext or title/keyword/abstract

Sgr A East

Radio: Non-thermal shell, in complex region, interacting with molecular material to the W.
X-ray: Diffuse emission, centrally peaked.
Point sources: Compact X-ray/radio source.

References:

Last updated: 20 Dec 2022


G0.3+0.0 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G0.33+0.04, G0.30+0.04 and G0.4+0.1.

Radio: Bilateral shell, near Galactic Centre.
X-ray: Diffuse emission.

References:

Last updated: 20 Dec 2022


G0.9+0.1 ADS: search fulltext or title/keyword/abstract

Radio: Flat spectrum core within steep spectrum shell.
X-ray: Central core, with non-thermal spectrum.
Point sources: Central pulsar.

References:

Last updated: 20 Dec 2022


G1.0−0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G1.05−0.1 and G1.05−0.15.

Radio: Incomplete shell, to the S of Sgr D.
X-ray: Possibly detected.

References:

Last updated: 20 Dec 2022


G1.4−0.1 ADS: search fulltext or title/keyword/abstract

Radio: Shell, brightest in E.
X-ray: Diffuse emission.

References:

Last updated: 20 Dec 2022


G1.9+0.3 ADS: search fulltext or title/keyword/abstract

Radio: Shell, brighter to the N, brightening; shows secular increase.
X-ray: Shell, with bright limbs to E and W.
Distance: HI absorption gives <10 kpc.

References:

Last updated: 20 Dec 2022


G3.1−0.6 ADS: search fulltext or title/keyword/abstract

Radio: Elongated shell.

References:

Last updated: 20 Dec 2022


G3.7−0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G003.8−00.3.

Radio: Double arc.

References:

Last updated: 20 Dec 2022


G3.8+0.3 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell.
Distance: Optical extinction suggests 4.1 kpc.

References:

Last updated: 20 Dec 2022


G4.2−3.5 ADS: search fulltext or title/keyword/abstract

Radio: Elongated shell.
Optical: Detected.

References:

Last updated: 25 Apr 2014


G4.5+6.8 ADS: search fulltext or title/keyword/abstract

Kepler, SN1604, 3C358

Notes: This is the remnant of Kepler's SN of AD1604.

Radio: Incomplete shell, brighter to the N.
Optical: Faint filaments.
X-ray: Shell, brighter to the N.
Distance: Optical expansion and proper motion indicates about 2.9 kpc, HI observations suggest 3.4 to 6.4 kpc.

References:

Last updated: 15 Dec 2022


G4.8+6.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G4.5+6.2.

Radio: Faint shell.

References:

Last updated: 25 Apr 2014


G5.2−2.6 ADS: search fulltext or title/keyword/abstract

Radio: Poorly resolved shell.

References:

Last updated: 25 Apr 2014


G5.4−1.2 ADS: search fulltext or title/keyword/abstract

Milne 56

Notes: Part been called G5.3−1.0. Has been suggested that this is not a SNR.

Radio: Incomplete shell, including wide `v' of emission to E with small flat-spectrum source at apex.
Optical: Detected.
X-ray: Pulsar detected, with faint extension.
Point sources: Pulsar nearby, in flat spectrum source.
Distance: HI absorption suggests >4.3 kpc, optical extinction suggests 3.9 kpc.

References:

Last updated: 14 Dec 2022


G5.5+0.3 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G5.55+0.32.

Radio: Shell.
Optical: Detected.

References:

Last updated: 11 May 2017


G5.9+3.1 ADS: search fulltext or title/keyword/abstract

Radio: Asymmetric shell.

References:

Last updated: 9 Dec 2022


G6.1+0.5 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G6.10+0.53.

Radio: Partial shell.
Optical: Detected.

References:

Last updated: 20 Dec 2022


G6.1+1.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G6.1+1.15.

Radio: Faint, diffuse emission.
Distance: Optical extinction suggests 3.3 or 3.7 kpc.

References:

Last updated: 14 Dec 2022


G6.4−0.1 ADS: search fulltext or title/keyword/abstract

W28

Notes: Has been called G6.6−0.2.

Radio: Several non-thermal sources in a ring, with flat spectrum core.
Optical: Diffuse emission.
X-ray: Diffuse emission from most of the remnant.
Point sources: Young pulsar near edge of remnant, but not thought to be related.
Distance: HI observations suggest 1.9 kpc, optical extinction suggests 3.6 kpc.

References:

Last updated: 20 Dec 2022


G6.4+4.0 ADS: search fulltext or title/keyword/abstract

Radio: Faint asymmetric shell.

References:

Last updated: 25 Apr 2014


G6.5−0.4 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G6.51−0.48, and part has been called G6.67−0.42.

Radio: Shell, overlapping G6.4−0.1.
Optical: Detected.
Distance: Optical extinction suggests 3.7 kpc.

References:

Last updated: 20 Dec 2022


G7.0−0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G7.06−0.12.

Radio: Double rim, brightest in W, confused by bright HII region M20 in SE.

References:

Last updated: 20 Dec 2022


G7.2+0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G7.20+0.20.

Radio: Partial shell.

References:

Last updated: 20 Dec 2022


G7.5−1.7 ADS: search fulltext or title/keyword/abstract

Radio: Irregular shell.
Point sources: Pulsar within boundary.

References:

Last updated: 20 Dec 2022


G7.7−3.7 ADS: search fulltext or title/keyword/abstract

1814−24

Notes: Has been associated with the SN of AD386.

Radio: Shell, with high polarisation.
X-ray: Arc in S.

References:

Last updated: 9 Apr 2019


G8.7−5.0 ADS: search fulltext or title/keyword/abstract

Radio: Asymmetric shell.

References:

Last updated: 13 Dec 2022


G8.7−0.1 ADS: search fulltext or title/keyword/abstract

(W30)

Notes: Has been called G8.6−0.1.

Radio: Clumpy non-thermal shell, with low-frequency turnover.
X-ray: Northern edge detected.
Point sources: Pulsar inside W edge.
Distance: Optical extinction suggests 4.2 kpc.

References:

Last updated: 20 Dec 2022


G8.9+0.4 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G8.90+0.40.

Radio: Shell.
Distance: Optical extinction suggests 3.5 kpc.

References:

Last updated: 20 Dec 2022


G9.7−0.0 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G9.7−0.1, G9.70−0.06 and G9.7+0.0.

Radio: Shell.

References:

Last updated: 20 Dec 2022


G9.8+0.6 ADS: search fulltext or title/keyword/abstract

Radio: Asymmetric shell.

References:

Last updated: 20 Dec 2022


G9.9−0.8 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G9.95−0.81.

Radio: Shell.
Optical: Detected.
Distance: H2 emission suggests 3.8 kpc.

References:

Last updated: 20 Dec 2022


G11.0−0.0 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G11.0+0.0, G11.03−0.05 and G11.00−0.05.

Radio: Partial shell.
X-ray: Diffuse emission.
Distance: Optical absorption suggests 2.4 kpc.

References:

Last updated: 20 Dec 2022


G11.1−0.7 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G11.15−0.71.

Radio: Partial shell.

References:

Last updated: 20 Dec 2022


G11.1+0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G11.18+0.11.

Radio: Shell.

References:

Last updated: 20 Dec 2022


G11.2−0.3 ADS: search fulltext or title/keyword/abstract

Notes: Probably associated with the SN of AD386.

Radio: Symmetrical clumpy shell, with flatter spectrum core.
X-ray: Shell, with hard spectrum centrally brightened region around pulsar.
Point sources: Central pulsar.
Distance: HI absorption indicates 4.4 kpc, H2 emission suggests 4.7 kpc.

References:

Last updated: 20 Dec 2022


G11.4−0.1 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell, possibly with central core.

References:

Last updated: 20 Dec 2022


G11.8−0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G11.89−0.21.

Radio: Shell.
X-ray: Possibly detected.

References:

Last updated: 20 Dec 2022


G12.0−0.1 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell, defined in E only.
X-ray: Detected, including possible PWN.

References:

Last updated: 20 Dec 2022


G12.2+0.3 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G12.26+0.30.

Radio: Partial shell.

References:

Last updated: 20 Dec 2022


G12.5+0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G12.58+0.22.

Radio: Diffuse, central brightened.

References:

Last updated: 20 Dec 2022


G12.7−0.0 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G12.72−0.00.

Radio: Shell.

References:

Last updated: 20 Dec 2022


G12.8−0.0 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G12.7+0.0, G12.82−0.02, G12.83−0.02.

Radio: Shell.
X-ray: Diffuse.
Point sources: Central X-ray pulsar.

References:

Last updated: 20 Dec 2022


G13.1−0.5 ADS: search fulltext or title/keyword/abstract

Notes:

Radio: Faint shell.

References:

Last updated: 20 Dec 2022


G13.3−1.3 ADS: search fulltext or title/keyword/abstract

Radio: Amorphous emission.
Optical: Filaments in S.
X-ray: Elongated emission.
Distance: Absorption indicates 2–4 kpc, optical extinction suggests 4.8 kpc.

References:

Last updated: 14 Dec 2022


G13.5+0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G13.46+0.16.

Radio: Elongated, incomplete shell.
Distance: H2 emission suggests 12.4 kpc.

References:

Last updated: 20 Dec 2022


G14.1−0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G14.18−0.12.

Radio: Shell.

References:

Last updated: 20 Dec 2022


G15.1−1.6 ADS: search fulltext or title/keyword/abstract

Radio: Elongated, incomplete shell.
Optical: Diffuse shell.
Distance: Optical extinction suggests 2.9 kpc.

References:

Last updated: 14 Dec 2022


G15.4+0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G15.42+0.18.

Radio: Shell.
X-ray: Centrally brightened.
Distance: HI observations suggest 4.8 kpc.

References:

Last updated: 20 Dec 2022


G15.5−0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G15.51−0.15.

Radio: Poorly defined.

References:

Last updated: 20 Dec 2022


G15.9+0.2 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell, with bright concentration to the E.
X-ray: Shell, brighter to S and E.
Point sources: Central X-ray source.
Distance: HI absorption suggests 7 to 16 kpc.

References:

Last updated: 20 Dec 2022


G16.0−0.5 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G16.05−0.57.

Radio: Shell.
Distance: H2 emission suggests 4.1 kpc.

References:

Last updated: 20 Dec 2022


G16.2−2.7 ADS: search fulltext or title/keyword/abstract

Radio: Double rim.

References:

Last updated: 24 May 2014


G16.7+0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G16.73+0.08.

Radio: Asymmetric shell with flat-spectrum core.
X-ray: Non-thermal core.
Distance: HI absorption suggests about 14 kpc.

References:

Last updated: 20 Dec 2022


G17.0−0.0 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G17.0+0.0, G17.02−0.04.

Radio: Shell.

References:

Last updated: 20 Dec 2022


G17.4−2.3 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete, poorly defined shell.
Optical: Filaments to SE, and diffuse emission.

References:

Last updated: 24 May 2014


G17.4−0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G17.48−0.12.

Radio: Partial shell.

References:

Last updated: 20 Dec 2022


G17.8−2.6 ADS: search fulltext or title/keyword/abstract

Radio: Well defined shell.

References:

Last updated: 24 May 2014


G18.1−0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G18.1−0.2 and G18.16−0.16.

Radio: Shell.
X-ray: Possibly detected.
Distance: HI absorption suggests 6.4 kpc, H2 emission suggests about 5.3 kpc.

References:

Last updated: 20 Dec 2022


G18.6−0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G18.62−0.28.

Radio: Partial shell.
Distance: HI absorption suggests 4.4 kpc.

References:

Last updated: 20 Dec 2022


G18.8+0.3 ADS: search fulltext or title/keyword/abstract

Kes 67

Notes: Has been called G18.9+0.3.

Radio: Incomplete shell, in complex region near the HII region W39.
Distance: Association with molecular cloud suggests 12 kpc, HI absorption suggests 13.8 kpc.

References:

Last updated: 20 Dec 2022


G18.9−1.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G18.95−1.1 and G18.94−1.04.

Radio: Non-thermal, diffuse partially limb-brightened, with central ridge.
Optical: Detected.
X-ray: Partial shell.
Point sources: Compact X-ray source, with diffuse nebula.
Distance: Optical absorption suggests 1.8 kpc, H2 emission suggests 4.7 kpc, optical extinction suggests 3.1 kpc.

References:

Last updated: 20 Dec 2022


G19.1+0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G19.15+0.27.

Radio: Partial shell.
Distance: Optical extinction suggests 3.6 kpc.

References:

Last updated: 20 Dec 2022


G20.0−0.2 ADS: search fulltext or title/keyword/abstract

Radio: Faint, filled-centre, polarised.
X-ray: Centrally brightened.
Point sources: OH source 20.1−0.1 is nearby.
Distance: HI absorption suggests 11.2 kpc.

References:

Last updated: 20 Dec 2022


G21.0−0.4 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G21.04−0.47.

Radio: Shell.

References:

Last updated: 20 Dec 2022


G21.5−0.9 ADS: search fulltext or title/keyword/abstract

Notes: Early observations relate to the central core only.

Radio: Filled-centre, with high frequency turnover.
X-ray: Central core, with extended, faint halo.
Point sources: Central pulsar.
Distance: HI absorption suggests 4.4 kpc.

References:

Last updated: 20 Dec 2022


G21.6−0.8 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G21.64−0.84.

Radio: Faint, irregular shell.

References:

Last updated: 20 Dec 2022


G21.8−3.0 ADS: search fulltext or title/keyword/abstract

Radio: Shell, polarised in E.
Optical: Filaments in N.

References:

Last updated: 20 Dec 2022


G21.8−0.6 ADS: search fulltext or title/keyword/abstract

Kes 69

Radio: Incomplete shell.
X-ray: Detected.
Distance: Association with CO indicates 5.2 kpc, HI absorption suggests 5.6 kpc, H2 emission suggests 4.1 kpc, optical extinction suggests 4.9 kpc.

References:

Last updated: 20 Dec 2022


G22.7−0.2 ADS: search fulltext or title/keyword/abstract

Radio: Non-thermal ring in complex region, overlapping G23.3−0.3.
X-ray: Possible detection.
Point sources: Variable radio source near centre, and γ-ray source near edge.
Distance: Association with CO indicates 4.4 kpc, HI absorption suggests 4.7 kpc, optical extinction suggests 4.7 kpc.

References:

Last updated: 20 Dec 2022


G23.3−0.3 ADS: search fulltext or title/keyword/abstract

W41

Radio: Distorted ring, in complex region, overlapping G22.7−0.2.
X-ray: Possible extended emission, with compact sources.
Point sources: Pulsar association suggested.
Distance: HI and CO observations suggest 4.2 or 4.8 kpc, optical extinction suggests 3.4 kpc.

References:

Last updated: 20 Dec 2022


G24.7−0.6 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell, defined in SW.
Distance: HI absorption and CO suggests 3.8 kpc.

References:

Last updated: 20 Dec 2022


G24.7+0.6 ADS: search fulltext or title/keyword/abstract

Radio: Filled-centre, with faint shell, and a compact HII region to the S.
Distance: Optical extinction suggests 2.7 kpc.

References:

Last updated: 20 Dec 2022


G25.1−2.3 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell, extent not well defined.
Distance: Optical extinction suggests 3.5 kpc.

References:

Last updated: 14 Dec 2022


G27.4+0.0 ADS: search fulltext or title/keyword/abstract

4C−04.71

Notes: Early references refer to G27.3−0.1 (Kes 73), a supposed larger remnant.

Radio: Incomplete shell.
X-ray: Diffuse emission, with central low period pulsar.
Point sources: Central AXP.
Distance: HI absorption suggests 7.5 to 9.8 or 5.8 kpc, association with CO suggests 9 kpc, H2 emission suggests 5.8 kpc.

References:

Last updated: 20 Dec 2022


G27.8+0.6 ADS: search fulltext or title/keyword/abstract

Radio: Filled-centre, with spectral turnover.
X-ray: Possible pulsar wind nebula.
Distance: Optical extinction suggests 4.0 kpc.

References:

Last updated: 14 Dec 2022


G28.3+0.2 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G28.36+0.21.

Radio: Asymmetric shell.

References:

Last updated: 20 Dec 2022


G28.6−0.1 ADS: search fulltext or title/keyword/abstract

Radio: Poorly defined regions of non-thermal emission.
X-ray: Diffuse shell, with thermal and non-thermal emission.
Point sources: Pulsar in NE.
Distance: HI absorption and CO suggests 9.6 kpc.

References:

Last updated: 20 Dec 2022


G28.7−0.4 ADS: search fulltext or title/keyword/abstract

Notes: Has been called As G28.7−0.44.

Radio: Asymmetric shell.

References:

Last updated: 20 Dec 2022


G28.8+1.5 ADS: search fulltext or title/keyword/abstract

Radio: Part of rim detected.
X-ray: Diffuse, Centrally brightened.

References:

Last updated: 11 May 2017


G29.6+0.1 ADS: search fulltext or title/keyword/abstract

Radio: Diffuse shell.
Point sources: AXP associated.

References:

Last updated: 20 Dec 2022


G29.7−0.3 ADS: search fulltext or title/keyword/abstract

Kes 75

Notes: Has erroneously been called G29.6+0.1.

Radio: Shell with flatter spectrum emission from centre.
X-ray: Thermal shell and non-thermal core, and central pulsar.
Point sources: X-ray pulsar.
Distance: Association with CO implies 11 kpc, and HI absorption suggests 5.6 kpc.

References:

Last updated: 20 Dec 2022


G30.7−2.0 ADS: search fulltext or title/keyword/abstract

Radio: Poorly defined.

References:

Last updated: 13 Aug 1998


G30.7+1.0 ADS: search fulltext or title/keyword/abstract

Radio: Non-thermal, highly polarised part shell?
Point sources: Compact source near centre.
Distance: Optical extinction suggests 3.6 kpc.

References:

Last updated: 14 Dec 2022


G31.5−0.6 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G31.55−0.65.

Radio: Distorted shell? near HII region.
Optical: Diffuse, incomplete shell.

References:

Last updated: 20 Dec 2022


G31.9+0.0 ADS: search fulltext or title/keyword/abstract

3C391

Radio: Shell, brightest in NW, with low frequency turnover.
X-ray: Diffuse with central core.
Distance: HI absorption and CO association suggests 7.1 kpc, as does H_2 emission.

References:

Last updated: 20 Dec 2022


G32.0−4.9 ADS: search fulltext or title/keyword/abstract

3C396.1

Radio: Possible large shell?

References:

Last updated: 25 Feb 1988


G32.1−0.9 ADS: search fulltext or title/keyword/abstract

Radio: Possible faint shell, not well defined.
X-ray: Diffuse, with clumps.
Distance: H2 emission suggests 5 kpc, optical extinction suggests 4.7 kpc.

References:

Last updated: 20 Dec 2022


G32.4+0.1 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G32.45+0.1.

Radio: Shell.
X-ray: Shell.
Distance: X-ray absorption suggests 17 kpc.

References:

Last updated: 20 Dec 2022


G32.8−0.1 ADS: search fulltext or title/keyword/abstract

Kes 78

Notes: Part has been called G33.1−0.1.

Radio: Incomplete, elongated shell.
Optical: Detected.
X-ray: Patchy, elongated shell.
Distance: Association with CO and HI absorption indicate 4.8 kpc, H2 emission suggests 5.4 kpc.

References:

Last updated: 20 Dec 2022


G33.2−0.6 ADS: search fulltext or title/keyword/abstract

Radio: Incomplete shell.
Optical: Filaments and diffuse emission.
Distance: H2 emission suggests 4.9 kpc.

References:

Last updated: 20 Dec 2022


G33.6+0.1 ADS: search fulltext or title/keyword/abstract

Kes 79, 4C00.70, HC13

Notes: Has been called G33.7+0.0 and G33.7+0.05.

Radio: Shell, with bright central region, in complex region.
X-ray: Multiple shells and filaments.
Point sources: Central X-ray pulsar.
Distance: HI absorption suggests 7.8 or 3.5 kpc, and CO observations suggest 5.5 kpc.

References:

Last updated: 20 Dec 2022


G34.7−0.4 ADS: search fulltext or title/keyword/abstract

W44, 3C392

Notes: Has been called G34.6−0.5.

Radio: Distorted shell, brighter to the E, with pulsar and associated nebula.
Optical: Diffuse emission.
X-ray: Centrally concentrated, thermal spectrum, plus pulsar wind nebula.
Point sources: Pulsar within the boundary of the remnant.
Distance: HI absorption suggests 3.0 kpc, optical absorption suggests 2.1 or 2.7 kpc, H2 emission suggests 2.8 kpc.

References:

Last updated: 20 Dec 2022


G35.6−0.4 ADS: search fulltext or title/keyword/abstract

Notes: Re-identified as SNR in 2009.

Radio: Diffuse, with some limb brightening.
Distance: HI absorption suggests 3.8 kpc.

References:

Last updated: 20 Dec 2022


G36.6−0.7 ADS: search fulltext or title/keyword/abstract

Radio: polarised arc, possibly part of a larger shell?
Distance: Optical extinction suggests 8.7 kpc.

References:

Last updated: 20 Dec 2022


G36.6+2.6 ADS: search fulltext or title/keyword/abstract

Radio: Poorly resolved shell.

References:

Last updated: 19 May 1992


G38.7−1.3 ADS: search fulltext or title/keyword/abstract

Notes: G38.7−1.4 refers to the E portion.

Radio: Incomplete shell.
Optical: Arc of filaments, brighter to E.
X-ray: Detected in E.
Distance: Optical extinction suggests 4.1 kpc.

References:

Last updated: 14 Dec 2022


G39.2−0.3 ADS: search fulltext or title/keyword/abstract

3C396, HC24, NRAO 593

Radio: Shell, brighter to W, with faint `tail' to E.
X-ray: Diffuse, brighter to W, with central core.
Point sources: Central X-ray source.
Distance: HI absorption suggests 8.5 kpc, H2 emission suggests 9.5 kpc.

References:

Last updated: 20 Dec 2022


G39.7−2.0 ADS: search fulltext or title/keyword/abstract

W50, SS433

Notes: Eastern part has been called G40.0−3.1. Is this a SNR?

Radio: Elongated shell, containing SS433, adjacent to the HII region S74.
Optical: Faint filaments at the edge of the radio emission.
X-ray: Emission from SS433 and two lobes.
Point sources: SS433 is the compact source in the centre of the W50.
Distance: HI absorption and CO observations indicate 4.9 kpc, optical emission gives 4.7 kpc.

References:

Last updated: 15 Dec 2022


G40.5−0.5 ADS: search fulltext or title/keyword/abstract

Radio: Shell, brightest to the NE.
Point sources: Central pulsar.
Distance: Optical extinction suggests 5.1 kpc.

References:

Last updated: 20 Dec 2022


G41.1−0.3 ADS: search fulltext or title/keyword/abstract

3C397

Radio: 3C397 is two sources: the E is the SNR, the W is a HII region.
X-ray: Brighter to the E and W, with central component.
Distance: HI absorption suggest 8.5 kpc.

References:

Last updated: 20 Dec 2022


G41.5+0.4 ADS: search fulltext or title/keyword/abstract

Radio: Partial clumpy shell, brighter to NE.

References:

Last updated: 20 Dec 2022


G42.0−0.1 ADS: search fulltext or title/keyword/abstract

Radio: Irregular shell.

References:

Last updated: 20 Dec 2022


G42.8+0.6 ADS: search fulltext or title/keyword/abstract

Notes: Has been called G42.8+0.65.

Radio: Faint shell.
Point sources: Near soft gamma repeater, and young pulsar.
Distance: Optical extinction suggests 4.2 kpc.

References:

Last updated: 20 Dec 2022


G43.3−0.2 ADS: search fulltext or title/keyword/abstract

W49B

Radio: Shell, brightest to the SE and W, near the HII region W49A.
X-ray: Centrally brightened, elongated E–W.
Point sources: Compact X-ray source.
Distance: HI absorption suggests 11.3 kpc, H2 emission suggests 7.5 kpc.

References:

Last updated: 20 Dec 2022


G43.9+1.6 ADS: search fulltext or title/keyword/abstract

Radio: Large, poorly defined faint shell.
Point sources: Soft gamma repeater nearby.
Distance: Association with CO suggests 3.1 kpc, optical extinction suggests 1.5 kpc.

References:

Last updated: 14 Dec 2022


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Dave Green / Cambridge, UK /