Results
author = "Alexander, D M"
The X-ray-Infrared/Submillimetre Connection and the Legacy Era of Cosmology
Author(s) :
Alexander, D. M.
Description :
We review some recent results on the identification and characterisation of
Active Galactic Nuclei (AGN) obtained by cross correlating X-ray surveys with
infrared and submillimetre surveys. We also look toward the scientific gains
that could be achieved from an XMM-Newton survey of the medium-deep...
Repository :
arXiv
Language(s) :
Undetermined
Where do z~2 Submillimeter-Emitting Galaxies Lie On the Black-Hole-Spheroid Mass Plane?
Author(s) :
Alexander, D. M.
Description :
Submillimeter-emitting galaxies (SMGs) are z~2 bolometrically luminous
systems hosting energetic starburst and AGN activity. SMGs may represent a
rapid growth phase that every massive galaxy undergoes before lying on the
well-established black-hole-spheroid mass relationship in the local Universe....
Repository :
arXiv
Language(s) :
Undetermined
Identifying the Obscured Black-Hole Growth Phase of Distant Massive Galaxies
Author(s) :
Alexander, D. M.
Description :
It is well established that a dominant phase in the growth of massive
galaxies occurred at high redshift and was heavily obscured by gas and dust.
Many studies have explored the stellar growth of massive galaxies but few have
combined these constraints with the growth of the supermassive black hol...
Repository :
arXiv
Language(s) :
Undetermined
On the Seyfert 2 warm and cool infrared dichotomy
Author(s) :
Alexander, D. M.
Description :
An optical spectropolarimetric study has shown that the detectability of
polarised broad H-alpha in Seyfert 2 galaxies is correlated to the IRAS f60/f25
flux ratio where only those Seyfert 2s with "warm" IRAS colours show polarised
broad line emission. It was suggested that those Seyfert 2s with "...
Repository :
arXiv
Language(s) :
Undetermined
The Unified model and the Seyfert 2 infrared dichotomy
Author(s) :
Alexander, D. M.
Description :
An optical spectropolarimetric study has shown that the detectability of
polarised broad H-alpha in Seyfert 2 galaxies is correlated to the IRAS f60/f25
flux ratio where only those Seyfert 2s with "warm" IRAS colours show polarised
broad line emission. It was suggested that those Seyfert 2s with "...
Repository :
arXiv
Language(s) :
Undetermined
The Quest for a Complete Census of AGN Activity
Author(s) :
Alexander, D. M.
Description :
Deep X-ray surveys provide the most efficient identification of Active
Galactic Nuclei (AGN) activity. However, recent evidence has indicated that the
current <10 keV surveys do not detect the most heavily obscured AGNs. Here we
explore whether the X-ray undetected AGN population can be identified...
Repository :
arXiv
Language(s) :
Undetermined
Weighing Black Holes in high-z SCUBA Galaxies
Author(s) :
Alexander, D. M.
Description :
Deep SCUBA surveys have uncovered a population of dust-enshrouded
star-forming galaxies at z~2. Using the ultra-deep 2 Ms Chandra Deep
Field-North survey we recently showed that a large fraction of these systems
are also undergoing intense black-hole growth. Here we provide further
constraints on ...
Repository :
arXiv
Language(s) :
Undetermined
A local infrared perspective to deeper ISO surveys
Description :
We present new techniques to produce IRAS 12 micron samples of galaxies and
stars. We show that previous IRAS 12 micron samples are incompatible for
detailed comparison with ISO surveys and review their problems. We provide a
stellar infrared diagnostic diagram to distinguish galaxies from stars w...
Repository :
arXiv
Language(s) :
Undetermined
Supermassive black-hole growth over cosmic time: Active galaxy demography, physics, and ecology from Chandra surveys
Description :
Extragalactic X-ray surveys over the past decade have dramatically improved understanding of the majority populations of active galactic nuclei (AGNs) over most of the history of the universe. Here we briefly highlight some of the exciting discoveries about AGN demography, physics, and ecology, with...
Repository :
Europe PubMed Central
Language(s) :
English
The obscured quasar population from optical, mid-infrared, and X-ray surveys
Description :
Over the last few years, optical, mid-infrared and X-ray surveys have brought
to light a significant number of candidate obscured AGN and, among them, many
Type 2 quasars, the long-sought after "big cousins'' of local Seyfert 2
galaxies. However, despite the large amount of multi-wavelength data c...
Repository :
arXiv
Language(s) :
Undetermined