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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1404

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)

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