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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1624
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dc.contributor.authorOmar, A.-
dc.contributor.authorAnantharamaiah, K.R.-
dc.contributor.authorRupen, M.-
dc.contributor.authorRigby, J.-
dc.date.accessioned2006-12-28T10:02:46Z-
dc.date.available2006-12-28T10:02:46Z-
dc.date.issued2002-01-
dc.identifier.citationAstronomy and Astrophysics, 2002, Vol.381, pL29-L32en
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/2289/1624-
dc.description.abstractVLA 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.en
dc.format.extent180958 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherEDP Sciencesen
dc.relation.urihttp://arxiv.org/abs/astro-ph/0111268en
dc.relation.urihttp://dx.doi.org/10.1051/0004-6361:20011604en
dc.rights(2002) by the European Southern Observatory (ESO).en
dc.subjectGALAXIES: ACTIVEen
dc.subjectGALAXIES: INDIVIDUAL: NGC 1052en
dc.subjectGALAXIES: ISMen
dc.subjectRADIO LINES: GALAXIESen
dc.titleVLA detection of OH absorption from the elliptical galaxy NGC 1052en
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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