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Journal Article

Discovery of an Extended Ultraviolet Disk in the Nearby Galaxy NGC 4625


Popescu,  Cristina C.
Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;


Tuffs,  Richard
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Gil de Paz, A., Madore, B., Boissier, S., Swaters, R., Popescu, C. C., Tuffs, R., et al. (2005). Discovery of an Extended Ultraviolet Disk in the Nearby Galaxy NGC 4625. The Astrophysical Journal, 627(1, Part 2), L29-L32.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-88AA-F
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.