Journal Article

H <span class="smallCaps">i</span> gas in the rejuvenated radio galaxy 4C29.30

Yogesh Chandola, D. J. Saikia and Neeraj Gupta

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 403, issue 1, pages 269-273
Published in print March 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15854.x
H i gas in the rejuvenated radio galaxy 4C29.30

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We report the results of our observations of H i absorption towards the central region of the rejuvenated radio galaxy 4C29.30 (J0840+2949) with the Giant Metrewave Radio Telescope. The radio source has diffuse, extended emission with an angular size of ∼520 arcsec (639 kpc) within which a compact edge-brightened double-lobed source with a size of 29 arcsec (36 kpc) is embedded. The absorption profile which is seen towards the central component of the inner double is well resolved and consists of six components; all but one of which appears to be redshifted relative to the optical systemic velocity. The neutral hydrogen column density is estimated to be N(H i) =4.7 × 1021(Ts/100)(fc/1.0) cm−2, where Ts and fc are the spin temperature and covering factor of the background source, respectively. This detection reinforces a strong correlation between the occurrence of H i absorption and rejuvenation of radio activity suggested earlier, with the possibility that the redshifted gas is fuelling the recent activity.

Keywords: galaxies: active; galaxies: individual: 4C29.30; galaxies: nuclei; radio continuum: galaxies; radio lines: galaxies

Journal Article.  3477 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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