Hopkins Ultraviolet Telescope Observations of Six E and S0 Galaxies

Details Hopkins Ultraviolet Telescope Observations of Six E and S0 Galaxies Hopkins Ultraviolet Telescope Observations of Six E and S0 Galaxies

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2004b&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #20.04; Bulletin of the American Astronomical Society, Vol. 27, p.834

Astronomy and Astrophysics

Astronomy

Scientific paper

In order to better understand the hot stellar populations of E and S0 galaxies, we observed six objects using the Hopkins Ultraviolet Telescope. Through our 11'' times 60'' aperture, we obtained one observation each of M 49 (1346 s), M 87 (950 s), M 89 (1682 s), and NGC 3115 (1634 s), two observations of NGC 3379 (3074 s), and four observations of M 60 (5824 s). The far-ultraviolet (FUV) spectra were obtained during orbital night as part of the Astro-2 mission on the space shuttle Endeavor in March 1995, and cover the spectral range of 912 Angstroms to 1850 Angstroms with a resolution of 2--4 Angstroms. This sample quadruples the number of early-type galaxies studied to the Lyman limit. After correcting for geocoronal emission and interstellar extinction in our own Galaxy, all the spectra are similar, even though the ``UV upturn'' strength, as characterized by the parameter m1550-V, varies over the range of 2.04 mag to 3.86 mag for these galaxies. Comparison with models of evolved stellar populations confirms the conclusion from Astro-1 data that the FUV flux can be explained by stars with a narrow range of temperature and envelope mass on the extreme horizontal branch (EHB). This work was supported by NASA contract NAS 5-27000 to the Johns Hopkins University.

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