DSpace
 

RRI Digital Repository >
04. Astronomy and Astrophysics >
Research Papers (A&A) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1624

Title: VLA detection of OH absorption from the elliptical galaxy NGC 1052
Authors: Omar, A.
Anantharamaiah, K.R.
Rupen, M.
Rigby, J.
Keywords: GALAXIES: ACTIVE
GALAXIES: INDIVIDUAL: NGC 1052
GALAXIES: ISM
RADIO LINES: GALAXIES
Issue Date: Jan-2002
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, 2002, Vol.381, pL29-L32
Abstract: VLA observations of OH absorption towards the elliptical galaxy NGC 1052 are presented. Both OH lines, at 1665 and 1667 MHz, were detected in absorption towards the center of NGC 1052. The hyperfine ratio of the two OH lines (tau 1667/tau 1665) is 2.6+/-0.8 as compared to 1.8 expected for the excitation under LTE conditions for an optically thin cloud. The column density of OH is estimated to be 2.73 (+/-0.26)*E14 cm-2 assuming Tex ~ 10 K. The centers of both the OH lines are redshifted from the systemic velocity of the galaxy by ~ 173 km s-1. The velocity of OH line coincides with the velocity corresponding to the strongest HI absorption. We suggest that OH absorption is arising from a molecular cloud falling towards the nucleus. The OH line, though narrower, is found to be within the much broader and smoother H2O megamaser emission. The possible link between OH/HI and H2O emission is discussed.
URI: http://hdl.handle.net/2289/1624
ISSN: 0004-6361
Alternative Location: http://arxiv.org/abs/astro-ph/0111268
http://dx.doi.org/10.1051/0004-6361:20011604
Copyright: (2002) by the European Southern Observatory (ESO).
Appears in Collections:Research Papers (A&A)

Files in This Item:

File Description SizeFormat
2002 A&A V381 L29p.pdf4p.176.72 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

    RRI Library DSpace