Recent X-Ray Observations of Seyferts and Emission-Line Galaxies
نویسندگان
چکیده
منابع مشابه
X/γ-ray spectra of Seyferts and BeppoSAX observations
BeppoSAX results on Seyfert galaxies are reviewed and discussed.
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We present single-dish Lovell telescope H i observations of a sample of 67 emission-line and UV-excess galaxies, of which 52 are taken from the University of Michigan (UM) catalogue. In addition, H i observations of 24 gas-rich irregular galaxies are presented. We find that emission-line galaxies are H i–rich with a median H i mass to blue luminosity ratio MHI /LB of ∼ 0.45 M /L . Within the UM...
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In the standard CDM (Cold Dark Matter) cosmological scenario, initial density fluctuations, generated in the early Universe, grow under the influence of gravity. The Universe gets more and more structured with time. At large scale, the matter density distribution exhibits a web-like topology with expanding voids surrounded by contracting sheets and filaments. Massive clusters of galaxies, locat...
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In the last eight years, the Chandra and XMM–Newton satellites changed significantly our view of X–ray clusters of galaxies. In particular, several complex phenomena have been directly observed: interactions between cluster galaxies and the Intra Cluster Medium (ICM), cold fronts in the ICM, hot bubbles due to relativistic jets from radio loud AGN, the lack of cold gas in “cool–cores”, and non–...
متن کاملX-ray Emission from Clusters of Galaxies
We present a summary of X-ray spectral observations of 30 clusters of galaxies from HEAO-1. There exists strong correlations between X-ray luminosity, Lx , and temperature kT in the form L xaT2 ' 3 . This result combined with the Lx vs central galaxy density relation and the virial theorem indicates that the core radius of the gas should be roughly independent of Lx or KT and that more luminous...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1980
ISSN: 1539-2996
DOI: 10.1017/s1539299600004536