NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A Very Large Array search for emission from HI associated with nearby Lyman alpha absorbersWe present a sensitive Very Large Array (VLA) search for H I emission from the vicinity of the Lyman alpha clouds in the Virgo Cluster, which were recently discovered with Hubble Space Telescope (HST) in absorption toward the nearest quasar 3C273. We searched an area of 40 by 40 arcmin centered on 3C273, covering a velocity range from 840 to 1840 km/s. The bandpass was self-calibrated on 3C273 leading to a spectral dynamic range of better than 10(exp 5) to 1. No H I was detected. The rms noise in the final images corresponds to a 3 sigma column density sensitivity of 2.8 x 10(exp 19) sq cm on scales of a few kpc. Small H I clouds could have been detected down to a few times 10(exp 6) solar mass. Our failure to detect H I emission at the higher column densities sets a lower limit to the radius of the Lyman alpha clouds of 3.9 kpc, assuming a spherical geometry.
Document ID
19950042294
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Van Gorkom, J. H.
(Columbia Univ. New York, NY, United States)
Bahcall, J. N.
(Institute for Advanced Study, Princeton, NJ United States)
Jannuzi, B. T.
(Institute for Advanced Study, Princeton, NJ United States)
Schneider, D. P.
(Institute for Advanced Study, Princeton, NJ United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1993
Publication Information
Publication: The Astronomical Journal
Volume: 106
Issue: 6
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
95A73893
Funding Number(s)
CONTRACT_GRANT: NSF AST-89-17744
CONTRACT_GRANT: NAG5-1618
CONTRACT_GRANT: NSF AST-90-23254
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available