The X-ray Variability of High-Redshift QSOs
نویسندگان
چکیده
منابع مشابه
Contribution of microlensing to X-ray variability of distant QSOs
We consider a contribution of microlensing to the X-ray variability of high-redshifted QSOs. Cosmologically distributed gravitational microlenses could be localized in galaxies (or even in bulge or halo of gravitational macrolenses) or could be distributed in a uniform way. We have analyzed both cases of such distributions. We found that the optical depth for gravitational microlensing caused b...
متن کاملThe Environments of High Redshift QSOs
We present a sample of i-dropout candidates identified in five Hubble Advanced Camera for Surveys fields centered on Sloan Digital Sky Surveys QSOs at redshift z ∼ 6. Our fields are as deep as the Great Observatory Origins Deep Survey (GOODS) ACS images which are used as a reference field sample. The galaxies are color-selected. We find them to be overdense in two fields, underdense in two fiel...
متن کاملOn the contribution of microlensing to X-ray variability of high-redshifted QSOs
We consider a contribution of microlensing in X-ray variability of high-redshifted QSOs. Such an effect could be caused by stellar mass objects (SMO) located in a bulge or/and in a halo of this quasar as well as at cosmological distances between an observer and a quasar. Here, we not consider microlensing caused by deflectors in our Galaxy since it is well-known from recent MACHO, EROS and OGLE...
متن کاملX - ray Properties of High Redshift Clusters
We describe the ensemble X-ray properties of high redshift clusters with emphasis on changes with respect to the local population. Cluster X-ray luminosity evolution is detected in five nearly independent surveys. The relevant issue now is characterizing this evolution. Cluster temperature evolution provides constraints on the dark matter and dark energy content of the universe. These constrain...
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: International Astronomical Union Colloquium
سال: 2002
ISSN: 0252-9211
DOI: 10.1017/s0252921100030773