THE ULTRAVIOLET UPTURN IN ELLIPTICAL GALAXIES AND ENVIRONMENTAL EFFECTS
نویسندگان
چکیده
منابع مشابه
UV Upturn in Elliptical Galaxies: Theory
I review the current theoretical understanding on the UV upturn phenomenon in early-type galaxies.
متن کاملFeedback and environmental effects in elliptical galaxies
The role of the environment of an elliptical galaxy on its hot interstellar gas is discussed. In general, the X-ray halos of early-type galaxies tend to be smaller and fainter in denser environments, with the exception of group-central galaxies. X-ray observations show many examples of nearby galaxies which are undergoing gas stripping. On the other hand, most bright galaxies in clusters do man...
متن کاملA Binary Model for the UV-upturn of Elliptical Galaxies
The discovery of an excess of light in the far-ultraviolet (UV) in 1969 in elliptical galaxies was a major surprise. While it is now clear that this UV excess (UV-upturn) is probably caused by an old population of helium-burning stars. Han et al (2002, 2003) proposed a binary model for the formation of hot subdwarfs (helium burning stars) and the model can reproduce the observations in our Gala...
متن کاملThe Far-Ultraviolet Radiation from Elliptical Galaxies
Since the discovery of the Ultraviolet Upturn Phenomenon (“UVX”) in early-type galaxies it has been clear that the stellar populations of such systems contain an unexpected hot component. Recent work has provided strong circumstantial evidence that the stars radiating at short wavelengths (λ < 2000 Å) is in fact due to hot horizontal branch, post-HB stars and post-AGB stars. We summarize the ar...
متن کاملFar-Ultraviolet Emission from Elliptical Galaxies at z = 0.55.
The rest-frame UV-to-optical flux ratio, which characterizes the "UV upturn" phenomenon, is potentially the most sensitive tracer of age in elliptical galaxies; models predict that it may change by orders of magnitude over the course of a few gigayears. In order to trace the evolution of the UV upturn as a function of redshift, we have used the far-UV camera on the Space Telescope Imaging Spect...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal Supplement Series
سال: 2011
ISSN: 0067-0049,1538-4365
DOI: 10.1088/0067-0049/195/2/22