HI absorption toward the nucleus of the radio galaxy PKS 2322-123 in A 2597

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dc.contributor.author Taylor, Gregory en_US
dc.contributor.author O'Dea, Christopher en_US
dc.contributor.author Peck, Alison en_US
dc.contributor.author Koekemoer, Anton en_US
dc.date.accessioned 2006-06-09T13:06:57Z en_US
dc.date.available 2006-06-09T13:06:57Z en_US
dc.date.issued 1999-02-10 en_US
dc.identifier.citation Astrophysical Journal Letters Journal 512N1 (1999) L27–L30 en_US
dc.identifier.issn 1538-4357 en_US
dc.identifier.uri http://hdl.handle.net/1850/1963 en_US
dc.description Also archived in: arXiv:astro-ph/9811343 v2 24 Nov 1998 en_US
dc.description.abstract We present sensitive, high resolution Very Long Baseline Array (VLBA) observations of the central 0.3′′ of PKS 2322−123 at 1.3 and 5 GHz. These observations reveal straight and symmetric jets emerging from both sides of an inverted spectrum core. The 21 cm line of atomic hydrogen is detected in absorption against the core and eastern jet with substantial opacities, but is not seen towards the equally strong western jet. Both a narrow (110 km s−1 FWHM) and a very broad (735 km s−1 FWHM) line are seen, although the very broad line is seen only against the core. Both lines are redshifted (∼220 ± 100 km s−1) with respect to the systemic velocity. The most likely explanation for the observed Hi kinematics are an atomic torus centered on the nucleus with considerable turbulence and inward streaming motions. The scale height of this torus is less than 20 pc. Though rare in flux limited samples of compact radio sources, symmetric parsec-scale structure appears nearly ubiquitous among radio galaxies with Hi absorption, probably because they are viewed more nearly edge-on through the torus. (Refer to PDF file for exact formulas). en_US
dc.description.sponsorship GBT thanks STScI for hospitality during a visit in which this paper was written. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, Caltech, under contract with NASA. en_US
dc.format.extent 289174 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher University of Chicago Press: Astrophysical Journal Letters en_US
dc.relation.ispartofseries vol. 512 en_US
dc.relation.ispartofseries no. 1 en_US
dc.relation.ispartofseries part 2 en_US
dc.relation.ispartofseries pps. L27–L30 en_US
dc.subject Cooling flows en_US
dc.subject Galaxies-clusters en_US
dc.subject Galaxies-elliptical and lenticular en_US
dc.subject Galaxies-individual (A2597) en_US
dc.subject Galaxies-individual (PKS 2322−123) en_US
dc.subject Galaxies-jets en_US
dc.title HI absorption toward the nucleus of the radio galaxy PKS 2322-123 in A 2597 en_US
dc.type Article en_US

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