MPI für Kernphysik / Infrared Astrophysics |
|Discovery of an Extended Ultraviolet Disk in the Nearby Galaxy NGC 4625|
|Authors:||Gil de Paz, A.; Madore, B.F.; Boissier, S.; Swaters, R.; Popescu, Cristina C.; Tuffs, Richard; Sheth, K.; Kennicutt, Jr.; Bianchi, L.; Thilker, D.; Martin, D. C.|
|Research Context:||galaxies: formationgalaxies: individual (NGC 4625)galaxies: star clustersultraviolet: galaxies|
|Date of Publication (YYYY-MM-DD):||2005-07-01|
|Title of Journal:||The Astrophysical Journal|
|Issue / Number:||1, Part 2|
|Copyright:||© 2005. The American Astronomical Society|
|Review Status:||not specified|
|Abstract / Description:||Recent far-UV (FUV) and near-UV (NUV) observations of the nearby galaxy NGC 4625 made by the Galaxy Evolution Explorer (GALEX) show the presence of an extended UV disk reaching to 4 times the optical radius of the galaxy. The UV-to-optical colors suggest that the bulk of the stars in the disk of NGC 4625 are currently being formed, providing a unique opportunity to study today the physics of star formation under conditions similar to those when the normal disks of spiral galaxies like the Milky Way first formed. In the case of NGC 4625, the star formation in the extended disk is likely to be triggered by interaction with NGC 4618 and possibly also with the newly discovered galaxy NGC 4625A. The positions of the FUV complexes in the extended disk coincide with peaks in the H I distribution. The masses of these complexes are in the range 103104 M, with their H emission (when present) being dominated by ionization from single stars.|
|Free Keywords:||galaxies: formationgalaxies: individual (NGC 4625)galaxies: star clustersultraviolet: galaxies|
|External Publication Status:||published|
|Affiliations:||MPI für Kernphysik/Group H. J. Völk/Infrared Astrophysics (R. Tuffs, H.J. Völk)|
|External Affiliations:||Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101.
Department of Astronomy, University of Maryland, College Park, MD 20742-2421
Spitzer Science Center, California Institute of Technology, MC 220-6, 1200 East California Boulevard, Pasadena, CA 91125.
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.
Center for Astrophysical Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.
California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125.
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