Title:	Detection of an H I disk in Hydra A?
Authors:	Dwarakanath, K.S. Owen, F.N. Van Gorkom, J.H.
Keywords:	ABSORPTION SPECTRA COOLING FLOWS (ASTROPHYSICS) DISK GALAXIES H I REGIONS RADIO GALAXIES GALACTIC CLUSTERS STELLAR SPECTRA VELOCITY DISTRIBUTION
Issue Date:	Mar-1995
Publisher:	The University of Chicago Press for the American Astronomical Society
Citation:	Astrophysical Journal Letters, 1995, Vol.442, p1-4
Abstract:	We present new observations of the H I absorption system seen toward the core of the radio galaxy Hydra A, which is the central galaxy in a cooling flow cluster Abell 780. Our improved spatial (approximately 2 sec) and velocity (approximately 1.4 km/s) resolutions indicate that the absorption arises very close to the nucleus, probably in a gas disk located in the central regions of the galaxy. There is no indication that any of the absorption arises in the cooling flow. The H I absorption is seen only toward the core and is within approximately 100 km/s of the systemic velocity. The absorption covers a velocity range approximately 100 km/s. It can be decomposed into six Gaussian components with widths approximately 10-20 km/s and optical depths approximately 0.1-0.5. No narrow line features (approximately 1 km/s) were detected in Hydra A to a 3 sigma optical depth limit of 0.06.
URI:	http://hdl.handle.net/2289/1404
ISSN:	0004-637X 1538-4357 (online)
Alternative Location:	http://adsabs.harvard.edu/cgi-bin/bib_query?1995ApJ...442L...1D
Copyright:	(1995) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System.
Appears in Collections:	Research Papers (A&A)

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.