Group galaxies around giant radio galaxy NGC 6251
Cheng, R., Peng, B., Strom, R.G., and Wei, J. (2011) Group galaxies around giant radio galaxy NGC 6251. Monthly Notices of the Royal Astronomical Society, 412 (4). pp. 2433-2444.
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We have investigated galaxies around NGC 6251 to search for an associated group. Our main goal is to study the environment around the giant radio galaxy to better understand the reasons for its size and structure. To this end, we have made spectroscopic observations with the 2.16-m optical telescope at Xinglong Station of the National Astronomical Observatories of China (NAOC) and obtained spectra of 45 objects (including four likely stars). The redshifts give us 10 new galaxies in a group, which are in addition to seven previously known members. The 17 galaxies' positions are compared with the radio emission. The optical velocity dispersion of group members within 0.7 Mpc of NGC 6251 is not consistent with that expected from correlation curves of X-ray luminosity Lx versus velocity dispersion σr. We briefly discuss this result, suggesting that in the NGC 6251 group, the density of X-ray emitting gas is unusually low, and this is the main reason for the size of the radio source.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||galaxies: active, galaxies: distances and redshifts, galaxies: individual: NGC 6251, galaxies: ISM, ISM: jets and outflows, techniques: spectroscopic,|
|FoR Codes:||02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020103 Cosmology and Extragalactic Astronomy @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%|
|Deposited On:||26 Apr 2012 16:24|
|Last Modified:||21 May 2013 01:50|
Last 12 Months: 0
|Citation Counts with External Providers:||Web of Science: 4|
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