Hydra A
| {{{name}}} | |
|---|---|
 Hydra A imaged by Hubble Space Telescope | |
| Observation data (J2000.0 epoch) | |
| Constellation | Hydra |
| Right ascension | 09h 18m 05.6680s[1] |
| Declination | −12° 05′ 43.806″[1] |
| Characteristics | |
| Type | G |
| Other designations | |
| Hydra A, MCG -02-24-007, 3C 218, PKS 0915-11, WISEA J091805.68-120543.9[1] | |
Hydra A (also known as 3C 218), is a giant elliptical galaxy with an active galactic nucleus. Since its designation as Hydra A, the galaxy is located in the constellation of Hydra at a distance of 840 million light-years according to redshift values. It was discovered in 1952 by the Australian astronomer Bernard Mills during a survey of strong radio sources. Hydra A is one of the brightest X-ray sources in the sky as seen from Earth.[1][2][3][4]
Observation
Hydra A is located in a galaxy cluster named CIG 0915.7-1153 containing six galaxies. According to the redshift values of the different galaxies measured by the NOAO Fundamental Plane Survey and the X-ray distance measurement by the ROSAT X-ray space telescope, the cluster ClG 0915.7-1153 is located at 742 million light-years
Reference
- ↑ 1.0 1.1 1.2 1.3 "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2025-12-19.
- ↑ "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2025-12-19.
- ↑ Smith, Russell J.; Hudson, Michael J.; Nelan, Jenica E.; Moore, Stephen A. W.; Quinney, Stephen J.; Wegner, Gary A.; Lucey, John R.; Davies, Roger L.; Malecki, Justin J.; Schade, David; Suntzeff, Nicholas B. (2004-10). "NOAO Fundamental Plane Survey. I. Survey Design, Redshifts, and Velocity Dispersion Data". The Astronomical Journal. 128 (4): 1558–1569. doi:10.1086/423915. ISSN 0004-6256. Check date values in:
|date=(help) - ↑ "1952AuSRA...5..456M Page 456". adsabs.harvard.edu. Retrieved 2025-12-19.
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