Note: this is an
archived version which has been superseded.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: 0.40
- Radio: Distorted shell (4C50.52, an extragalactic double, is within the boundary of the remnant).
- Optical: Filaments possibly associated.
- X-ray: Centrally brightened.
- Distance: Various associations suggest 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, in SNRISM, p261. 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
- Uyaniker et al. 2003, ApJ, 585, 785. DRAO at 1.4 GHz (1') including polarisation.
ADS
Last updated: 11 Jan 2004
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Dave Green/MRAO, Cambridge, UK/D.A.Green@mrao.cam.ac.uk