Note: this is an
archived version which has been superseded. The current SNR
catalogue is at
http://www.mrao.cam.ac.uk/surveys/snrs/
G89.0+4.7
HB21
- Right Ascension: 20 45 00
- Declination: +50 35
- Size (/arcmin): 120×90
- Type: S
- Flux density at 1 GHz (/Jy): 220
- Spectral Index: 0.38
- Radio: Distorted shell (4C50.52, an extragalactic double, is within the boundary of the remnant).
- Optical: Filaments and patches.
- X-ray: Centrally brightened.
- Distance: Various associations imply 0.8 kpc.
References:
- Hirabayashi & Takahashi 1972, PASJ, 24, 231. 30-m dish at 4.2 GHz (11': S=160±40 Jy).
ADS
- Willis 1973, A&A, 26, 237. NRAO 300-ft at 2.7 GHz (5': S=148±16 Jy), plus optical filaments.
ADS
- Hill 1974, MNRAS, 169, 59. Half-Mile Telescope at 1.4 GHz (3'×3'.9).
ADS
- Haslam et al. 1975, A&A, 39, 453. Effelsberg 100-m at 2.7 GHz (4'.4)
ADS
- Fukui & Tatematsu 1988, IAUCo, 101, 261. CO observations of the vicinity (2'.7).
ADS
- Tatematsu et al. 1990, A&A, 237, 189. DRAO at 408 MHz (3'.5×4'.5) and 1.4 GHz (1'.0×1'.3), including HI, plus CO observations of adjacent molecular cloud.
ADS
- Biggs & Lyne 1996, MNRAS, 282, 691. Pulsar search.
ADS
- Leahy & Aschenbach 1996, A&A, 315, 260. ROSAT observations.
ADS
- Lorimer et al. 1998, A&A, 331, 1002. Pulsar search.
ADS
- Koo et al. 2001, ApJ, 552, 175. NRAO 12-m and other CO observations (27'' and 45'') of eastern part.
ADS
- Reich et al. 2003, A&A, 408, 961. Effelsberg 100-m at 863 MHz (14'.5: S=228±5 Jy).
ADS
- Uyanıker et al. 2003, ApJ, 585, 785. CGPS at 1.4 GHz (1') including polarisation.
ADS
- Byun et al. 2006, ApJ, 637, 283. CO observations of surroundings.
ADS
- Lazendic & Slane 2006, ApJ, 647, 350. X-ray observations.
ADS
- Leahy 2006, ApJ, 647, 1125. CGPS at 408 MHz (2'.8×3'.7) and 1.4 GHz (0'.8×1'.1).
ADS
- Kothes et al. 2006, A&A, 457, 1081. CGPS at 408 MHz (~3': S=259±19 Jy) and 1420 MHz (~1': S=183±9 Jy), including polarisation and review of flux densities.
ADS
- Kang & Koo 2007, ApJS, 173, 85. SGPS of high velocity HI.
ADS
- Mavromatakis et al. 2007, A&A, 461, 991. Optical observations.
ADS
- Shinn et al. 2009, ApJ, 693, 1883. IR observations.
ADS
- Pannuti et al. 2010, AJ, 140, 1787. ASCA and Chandra observations.
ADS
- Shinn et al. 2010, AdSpR, 45, 445. IR observations in S.
ADS
- Gao et al. 2011, A&A, 529, A159. Urumqi 25-m at 5 GHz (9'.5: S=107±11 Jy), including polarisation and review of flux densities.
ADS
- Reichardt et al. 2012, A&A, 546, A21. γ-ray detection.
ADS
- Shinn et al. 2012, ApJ, 759, 34. AKARI observations of H2.
ADS
- Pivato et al. 2013, ApJ, 779, 179. Fermi observations.
ADS
Last updated: 23 May 2014
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Dave Green/Cambridge, UK/D.A.Green@mrao.cam.ac.uk