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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 suggest 0.8 kpc, optical extinction suggests 2.3 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 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. Fermi detection. ADS
• Shinn et al. 2012, ApJ, 759, 34. Akari observations of H₂. ADS
• Pivato et al. 2013, ApJ, 779, 179. Fermi observations. ADS
• Planck Collaboration: Arnaud et al. 2016, A&A, 586, A134. Planck flux densities at 30 and 44 GHz. ADS
• Acero et al. 2016, ApJS, 224, 8. Fermi observations. ADS
• Boubert et al. 2017, A&A, 606, A14. Gaia search for runaway progenitor companion. ADS
• Shan et al. 2018, ApJS, 238, 35. Optical absorption for distance. ADS
• Suzuki et al. 2018, PASJ, 70, 75. Suzaku observations. ADS
• Ambrogi et al. 2019, A&A, 623, A86. Fermi detection. ADS
• Zhao et al. 2020, ApJ, 891, 137. Optical extinction for distance. ADS
• Sett et al. 2021, A&A, 647, A183. Pulsar search. ADS

Last updated: 16 Dec 2022

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