Infrared and Ultraviolet Observations of VIRGOHI 21 and NGC 4254's Outer Disk

Details Infrared and Ultraviolet Observations of VIRGOHI 21 and NGC 4254's Outer Disk Infrared and Ultraviolet Observations of VIRGOHI 21 and NGC 4254's Outer Disk

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1035..211w&link_type=abstract

THE EVOLUTION OF GALAXIES THROUGH THE NEUTRAL HYDROGEN WINDOW. AIP Conference Proceedings, Volume 1035, pp. 211-213 (2008).

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Astronomical And Space-Research Instrumentation, Star Formation, Ultraviolet, Hi Regions And 21-Cm Lines, Diffuse, Translucent, And High-Velocity Clouds, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Infrared, Accretion And Accretion Disks

Scientific paper

We present the results of Spitzer and Galex observations of gas/dust and star formation activities in the extreme outer disk of Virgo galaxy NGC 4254 and its surrounding regions. These observations were motivated in part by the potential existence of a ``dark galaxy'' in the vicinity. In the intergalactic VIRGOHI 21 region where the free-floating HI gas is found, neither UV nor mid-IR shows corresponding emission, thus providing stringent upper limits on the stellar mass and star formation rate in these clouds.
On the other hand, we find clearly discernible excess ultraviolet emission in parts of the extended disk of NGC 4254, which is yet unseen in the optical and infrared. These UV emission appears different from the so-called ``XUV disks'' of other nearby galaxies in both their distribution pattern and physical origin, which we suggest is directly related to the gas concentration of VIRGOHI 21.

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