3rd quadrant Galactic SNRs


G180.0−1.7

S147

Radio: Large faint shell, with spectral break.
Optical: Wispy ring.
X-ray: Possible detection.
Point sources: Pulsar within boundary, with faint wind nebula.
Distance: Optical absorption towards stars indicates >0.36 and <0.88 kpc.

References:

Last updated: 13 May 2017


G182.4+4.3

Radio: Incomplete shell.
Optical: Brighter in S and NW.
X-ray: Diffuse emission.

References:

Last updated: 28 Apr 2014


G184.6−5.8

Crab Nebula, 3C144, SN1054

Notes: This is the remnant of the SN of AD1054.

Radio: Filled-centre, central pulsar, with faint `jet' (or tube) extending from the N edge; shows secular decline.
Optical: Strongly polarised filaments, diffuse synchrotron emission, with `jet' faintly visible.
X-ray: Central `torus' around the pulsar.
Point sources: Pulsar powering the remnant.
Distance: Proper motions and radial velocities give 2 kpc.

References:

Last updated: 13 May 2017


G189.1+3.0

IC443, 3C157

Radio: Limb-brightened to NE, with faint extension to the E.
Optical: Brightest to the NE, with faint filaments outside the NE boundary.
X-ray: Shell, brightest to the NE, plus compact source with nebula.
Point sources: X-ray source and nebula in S.
Distance: Mean optical velocity suggests 0.7–1.5 kpc, association with S249 gives 1.5–2 kpc.

References:

Last updated: 16 Jun 2017


G190.9−2.2

Radio: Incomplete shell.

References:

Last updated: 20 May 2014


G205.5+0.5

Monoceros Nebula

Radio: In complex region, parts may be HII regions.
Optical: Large ring, near Rosette nebula.
X-ray: Possibly detected.
Distance: Mean optical velocity suggests 0.8 kpc, low frequency radio absorption suggests 1.6 kpc.

References:

Last updated: 13 May 2017


G206.9+2.3

PKS 0646+06

Radio: Diffuse source near the Monoceros Nebula.
Optical: Filaments detected.
X-ray: Possibly detected.

References:

Last updated: 12 Jun 2017


G213.0−0.6

Notes: Has also been called G213.3−0.4.

Radio: Large, faint shell.
Optical: Filamentary shell.
Point sources: Central X-ray source

References:

Last updated: 14 May 2014


G260.4−3.4

Puppis A, MSH 08−44

Notes: This remnant overlaps the Vela SNR (G263.9−3.3).

Radio: Angular shell, brightest to the E, poorly defined to the W.
Optical: Nebulosity and wisps.
X-ray: Brightest to the E.
Point sources: Central possible pulsating X-ray source.
Distance: Association with HI gives 2.2 kpc.

References:

Last updated: 16 Jun 2017


G261.9+5.5

Radio: Faint shell with little limb brightening.

References:

Last updated: 13 Aug 1998


G263.9−3.3

Vela (XYZ)

Notes: This refers to the whole Vela XYZ complex, of which X has at times been classified as a separate (filled-centre) remnant. This remnant is overlapped by G260.4−3.4 and G266.2−1.2.

Radio: Large shell, with flatter spectrum component (Vela X), and pulsar nebula.
Optical: Filaments.
X-ray: Patchy shell, with extensions, central nebula and pulsar.
Point sources: Pulsar within Vela X, with one-sided `jet'.
Distance: Vela pulsar parallax gives 0.3 kpc, optical spectra and HI studies suggest 0.25 kpc.

References:

Last updated: 13 May 2017


G266.2−1.2

RX J0852.0−4622

Notes: This remnant overlaps the Vela SNR (G263.9−3.3).

Radio: Incomplete shell, confused by the Vela SNR.
Optical: Nebulosity offset to NE.
X-ray: Non-thermal shell, confused by the Vela SNR, with central source, and possible associated pulsar.
Point sources: Central X-ray source, with optical nebula, and possible associated pulsar.
Distance: X-ray data suggest an upper limit of 1 kpc.

References:

Last updated: 13 May 2017


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