X-Ray Number Counts of Normal Galaxies

On the Nature of X-ray Bright Optically Normal Galaxies

Recent X-ray surveys by Chandra and XMM-Newton have revealed a population of X-ray bright, optically normal galaxies (XBONGs) at moderate redshifts. By analogy with nearby low-luminosity active galactic nuclei, we propose that many XBONGs are powered by an inner radiatively inefficient accretion flow (RIAF) plus an outer standard thin accretion disk. The absence of optical/UV activity in XBONGs...

X-ray Luminosity Functions of Normal Galaxies in the Goods

We present soft (0.5-2 keV) X-ray luminosity functions (XLFs) in the Great Observatories Origins Deep Survey (GOODS) fields, derived for galaxies at z ∼ 0.25 and 0.75. SED fitting was used to estimate photometric redshifts and separate galaxy types, resulting in a sample of 40 early-type galaxies and 46 late-type galaxies. We estimate k-corrections for both the X-ray/optical and Xray/NIR flux r...

Cosmological Implications of Number Counts of Clusters of Galaxies: logN–logS in X-Ray and Submm Bands

We compute the number counts of clusters of galaxies, the logN–logS relation, in several X-ray and submm bands on the basis of the Press-Schechter theory. We pay particular attention to a set of theoretical models which well reproduce the ROSAT 0.52 keV band logN–logS, and explore possibilities to further constrain the models from future observations with ASCA and/or at submm bands. The latter ...

Compact Stellar X-ray Sources in Normal Galaxies

Searching for X - ray luminous ‘ normal ’ galaxies in 2 dFGRS

We cross-correlated the Chandra XASSIST and XMM-Newton Serendipitous Source Catalogues with the 2 degree Field Galaxy Redshift Survey (2dFGRS) database. Our aim was to identify the most X-ray luminous (LX > 10 42 erg s −1) examples of galaxies in the local Universe whose X-ray emission is dominated by stellar processes rather than AGN activity ('normal' galaxies) as well as to test the empirica...