A high spectral resolution VLA search for H I absorption towards A496, A1795, and A2584

Details A high spectral resolution VLA search for H I absorption towards A496, A1795, and A2584 A high spectral resolution VLA search for H I absorption towards A496, A1795, and A2584

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109...26o&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 109, no. 1669, p. 26-31

Astronomy and Astrophysics

Astrophysics

22

Absorption Spectra, H I Regions, Radio Astronomy, Radio Sources (Astronomy), X Ray Spectra, Cooling Flows (Astrophysics), High Resolution, Hydrogen, Spectral Line Width, Spectral Resolution, Very Large Array (Vla), X Ray Sources, X Ray Spectroscopy

Scientific paper

In this paper, we present the results of a Very Large Array (VLA) search for H I absorption with high spectral resolution (1.6 km/s) towards A496, A1795, A2584, and A2597. These observations are well matched to the properties of cold, optically thick H I clouds, where the line width is given by the width of an individual cloud rather than the dispersion in an ensemble of clouds. We do not detect any H I absorption with narrow linewidths in these clusters. Our limits mainly apply to clouds which are larger than a few tenths parsec-i.e., if the clouds are much smaller than the background radio source and have a low covering factor in velocity space, they could still escape detection. The estimated limits on column density (for clouds in this regime of parameter space) are 2-3 orders of magnitude less than the 1021/sq cm required to explain the x-ray absorption seen in some cooling flow clusters. The combination of our high spectral resolution H I absorption searches with the existing lower spectral resolution H I absorption searches and the searches for H I emission makes it unlikely that atomic hydrogen is the dominant component of the cold x-ray absorbing gas in the inter-cloud medium (ICM).

Affiliated with

Also associated with

No associations

Rating

A high spectral resolution VLA search for H I absorption towards A496, A1795, and A2584 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A high spectral resolution VLA search for H I absorption towards A496, A1795, and A2584, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A high spectral resolution VLA search for H I absorption towards A496, A1795, and A2584 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1818302