Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..666s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 666-673.
Astronomy and Astrophysics
Astronomy
53
Emission Spectra, Intergalactic Media, Molecular Clouds, Spiral Galaxies, Charge Coupled Devices, Cosmic Dust, Cosmic Gases, H Lines, Stellar Activity, Very Large Array (Vla)
Scientific paper
The intergalactic cloud of neutral hydrogen in the M96 group are examined for signs of emission over a wide range of frequencies, from radio waves to X rays. Past or present stellar activity in the gas might have been expected to produce detectable visual infrared, CO, OH, or radio recombination-line emission. None was detected. The limits are used to study physical conditions in the intergalactic gas. In particular, B and V band limits on starlight and IRAS limits on the presence of dust strongly constrain the presence of stars or stellar by-products. However, given the uncertainties about physical conditions in the intergalactic environment, it is difficult to rule out entirely the presence of stellar-processed materials. Results of neutral hydrogen mapping from a large-scale survey of the intergalactic cloud and surrounding region are also presented. These observations confirm that the gas is confined to a large ringlike structure. The simplest interpretation remains that the intergalactic gas in Leo is primordial.
Claussen Mark J.
Dickman Robert L.
Hacking Perry B.
Houck James R.
Lewis Murray B.
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