RT Journal Article
T1 Discovery of an extended ultraviolet disk in the nearby galaxy NGC 4625
A1 Gil De Paz, Armando
A1 Madore, B. F.
A1 Boissier, S.
A1 Swaters, R.
A1 Popescu, C. C.
A1 Tuffs, R. J.
A1 Sheth, K.
A1 Kennicutt, R. C.
A1 Bianchi, L.
A1 Thilker, D.
A1 Martin, D. C.
AB 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 10^3-10^4 M_☉, with their Hα emission (when present) being dominated by ionization from single stars.
PB American Astronomical Society
SN 0004-637X
YR 2005
FD 2005-07-01
LK https://hdl.handle.net/20.500.14352/51777
UL https://hdl.handle.net/20.500.14352/51777
LA eng
NO © 2005. The American Astronomical Society. All rights reserved. GALEX is a NASA Small Explorer launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and scientific analysis of the GALEX mission. We thank Judith Cohen for kindly providing her Ha filter for COSMIC. R. C. K. is partially financed by NASA grant NAG5-8426.
DS Docta Complutense
RD 5 jul 2025