Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.0907b&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #09.07; Bulletin of the American Astronomical Society, Vol. 30, p.1261
Other
Scientific paper
The ``UV upturn'' is a sharp rise in spectra of elliptical galaxies shortward of rest-frame 2500 Angstroms. It is a ubiquitous phenomenon in nearby giant ellipticals, and is thought to arise primarily from low-mass evolved stars on the extreme horizontal branch and beyond. Models suggest that the UV upturn is a very strong function of age for these old stellar populations, increasing as the galaxy gets older. In some models the change in UV/optical flux ratio is a factor of 25 over timescales of less than 3 Gyr. To test the predictions for rapid evolution of the UV upturn, we have observed a sample of normal elliptical galaxies in the z=0.375 cluster Abell 370 with the Faint Object Camera aboard the Hubble Space Telescope. A combination of two long-pass filters was used to isolate wavelengths shortward of rest-frame 2700 Angstroms, providing a measurement of the UV upturn at a lookback time of approximately 4 Gyr. Surprisingly, the four ellipticals observed show a range of UV upturn strength that is similar to that seen in nearby ellipticals, with an equivalent m1550-V color ranging from 2.9--3.4 mag. Our result is inconsistent with some models for the UV upturn; other models are consistent only for a high redshift of formation (z_f >= 4).
Brown Ted M.
Deharveng Jean Michel
Ferguson Henry C.
Jedrzejewski Robert I.
No associations
LandOfFree
Measurements of Far-UV Emission from Elliptical Galaxies at z=0.375 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Measurements of Far-UV Emission from Elliptical Galaxies at z=0.375, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurements of Far-UV Emission from Elliptical Galaxies at z=0.375 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-992679