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

Wang, Zhong and Bush, Stephanie and McElroy, Doug and Minchin, Robert (2008) Infrared and Ultraviolet Observations of VIRGOHI 21 and NGC 4254's Outer Disk. In: The evolution of galaxies through the neutral hydrogen window. AIP Conference Proceedings. No.1035. American Institute of Physics , Melville, NY, pp. 211-213.

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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.

Item Type:Book Section
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Additional Information:© 2008 American Institute of Physics.
Subject Keywords:XUV Disk, Galaxy interaction, Galex, Spitzer, HI
Series Name:AIP Conference Proceedings
Issue or Number:1035
Classification Code:PACS: 95.85.Hp, 95.85.Mt, 98.58.Nk
Record Number:CaltechAUTHORS:20090713-133832280
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Official Citation:Infrared and Ultraviolet Observations of VIRGOHI 21 and NGC 4254's Outer Disk Zhong Wang, Stephanie Bush, Doug McElroy, and Robert Minchin, AIP Conf. Proc. 1035, 211 (2008), DOI:10.1063/1.2973583
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14573
Deposited By: Tony Diaz
Deposited On:01 Sep 2009 18:20
Last Modified:08 Nov 2021 23:12

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