G21.5−0.9
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- Right Ascension: 18 33 33
- Declination: −10 35
- Size (/arcmin): 5
- Type: C
- Flux density at 1 GHz (/Jy): 7
- Spectral Index: varies
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:
- Wilson & Weiler 1976, A&A, 53, 89. WSRT at 5 GHz (6″×35″).
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- Becker & Kundu 1976, ApJ, 204, 427. NRAO interferometer at 2.7 GHz (5″×20″) and 8 GHz (2″×7″), plus review of flux densities.
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- Altenhoff et al. 1979, A&AS, 35, 23. Effelsberg 100-m at 4.9 GHz (2.′6).
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- Becker & Szymkowiak 1981, ApJ, 248, L23. VLA at 5 GHz (8″), and Einstein observations.
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- Davelaar et al. 1986, ApJ, 300, L59. EXOSAT X-ray spectrum, and VLA HI observations.
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- Morsi & Reich 1987, A&AS, 69, 533. Effelsberg 100-m at 32 GHz (26.″5: S=5.64±0.29 Jy).
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- Fürst et al. 1988, PASJ, 40, 347. NRO array at 22.3 GHz (4.″4×7.″3).
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- Junkes et al. 1988, LNP, 316, 134. Effelsberg 100-m at 2.7 GHz (4.′3), including polarisation.
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- Salter et al. 1989, A&A, 225, 167. Observations at 90.7 (29.″5: S=3.8±0.4 Jy) and 141.9 GHz (S=2.5±1.2 Jy).
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- Salter et al. 1989, ApJ, 338, 171. NRAO 12-m at 84.2 GHz (S=3.94±0.70 Jy), plus review of flux densities.
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- Asaoka & Koyama 1990, PASJ, 42, 625. Ginga X-ray spectrum.
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- Kassim 1992, AJ, 103, 943. VLA at 327 MHz (3.′3×3.′4: S=9 Jy).
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- Wallace et al. 1994, A&A, 286, 565. HI of surroundings.
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- Green et al. 1997, AJ, 114, 2058. Parkes 64-m OH observations.
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- Slane et al. 2000, ApJ, 533, L29. Chandra observations identifying X-ray halo.
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- Warwick et al. 2001, A&A, 365, L248. XMM-Newton observations of X-ray halo.
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- Bock et al. 2001, ApJ, 561, L203. BIMA at 94 GHz (4.″6×8.″6).
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- Safi-Harb et al. 2001, ApJ, 561, 308. Chandra and other X-ray observations.
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- Reich 2002, in NSPS, p1. Effelsberg 100-m at 22 GHz (8″) and 32 GHz, including polarisation.
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- La Palombara & Mereghetti 2002, A&A, 383, 916. XMM-Newton upper limit on pulsations.
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- Bocchino et al. 2005, A&A, 442, 539. XMM-Newton and Chandra observations.
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- Gupta et al. 2005, CSci, 89, 853. Pulsar discovery.
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- Camilo et al. 2006, ApJ, 637, 456. Pulsar discovery.
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- Bietenholz & Bartel 2008, MNRAS, 386, 1411. VLA at 4.75 GHz (0.″53×0.″82) for expansion studies.
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- Tian & Leahy 2008, MNRAS, 391, L54. VGPS at 1.4 GHz (1′) including HI.
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- Matheson & Safi-Harb 2010, ApJ, 724, 572. Chandra observations.
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- Bietenholz et al. 2011, MNRAS, 412, 1221. VLA at 1.4 GHz (14″×18″).
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- Bhatnagar et al. 2011, ApJ, 739, L20. VLA at 6 GHz.
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- Sun et al. 2011, A&A, 536, A83. Urumqi 25-m at 5 GHz (9.′5: S=6.5±0.4 Jy) including polarisation and review of flux densities.
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- Zajczyk et al. 2012, A&A, 542, A12. IR observations, including polarisation.
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- Nynka et al. 2014, ApJ, 789, 72. NuSTAR observations.
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- Planck Collaboration: Arnaud et al. 2016, A&A, 586, A134. Planck flux densities at 70, 100 and 143 GHz.
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- Ranasinghe & Leahy 2018, AJ, 155, 204. VGPS HI absorption observations.
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- Aharonian et al. 2018, PASJ, 70, 38. Hitomi observations.
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- Lee et al. 2019, AJ, 157, 123. [FeII] IR observations.
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- Guest et al. 2019, MNRAS, 482, 1031. Deep Chandra observations.
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- Chawner et al. 2020, MNRAS, 493, 2706. Herschel observations.
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- Guest & Safi-Harb 2020, MNRAS, 498, 821. Chandra observations.
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- Dokara et al. 2021, A&A, 651, A86. VLA at 4 to 8 GHz (18″: S=5.8 Jy) including polarisation, and Spitzer observations.
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- Castelletti et al. 2021, A&A, 653, A62.VLA 74-MHz survey flux density, and other low-frequency radio flux densities.
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- Millard et al. 2021, ApJS, 257, 36. ISO far-IR spectroscopy.
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- Raycheva & Sezer 2022, AdSpR, 69, 531. Suzaku observations.
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- Lai et al. 2022, ApJ, 930, 1. VLA at 5 (10.″2×12.″9) and 7.4 GHz (7.″0×9.″9), including polarisation.
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- Rennie et al. 2022, ApJ, 933, 187. Observations at 26 to 34 GHz.
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Last updated: 5 Jan 2024
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