Results
author = "Barger, A. J."
The OPTX Project IV: How Reliable is [OIII] as a Measure of AGN Activity?
Description :
We compare optical and hard X-ray identifications of AGNs using a uniformly
selected (above a flux limit of f_2-8 keV = 3.5e-15 erg/cm2/s) and highly
optically spectroscopically complete ( > 80% for f_2-8 keV > 1e-14 erg/cm2/s
and > 60% below) 2-8 keV sample observed in three Chandra fields (CLANS...
Repository :
arXiv
Language(s) :
Undetermined
The Number Density of Intermediate and High Luminosity Active Galactic Nuclei at z~2-3
Description :
We use the combination of the 2 Ms Chandra X-ray image, new J and H band
images, and the Spitzer IRAC and MIPS images of the Chandra Deep Field-North to
obtain high spectroscopic and photometric redshift completeness of high and
intermediate X-ray luminosity sources in the redshift interval z=2-3....
Repository :
arXiv
Language(s) :
Undetermined
The view of galaxy formation from Hawaii: Seeing the dark side of the universe
Description :
The strength of the submillimeter background light shows directly that much
of the energy radiated by star formation and AGN is moved to far infrared
wavelengths. However, it is only as this background at 850 microns has been
resolved with direct submillimeter imaging that we have seen that it is ...
Repository :
arXiv
Language(s) :
Undetermined
An Integrated Picture of Star Formation, Metallicity Evolution, and Galactic Stellar Mass Assembly
Description :
We present an integrated study of star formation and galactic stellar mass
assembly from z=0.05-1.5 and galactic metallicity evolution from z=0.05-0.9
using a very large and highly spectroscopically complete sample selected by
rest-frame NIR bolometric flux in the GOODS-N. We assume a Salpeter IMF...
Repository :
arXiv
Language(s) :
Undetermined
Measuring the Sources of the Intergalactic Ionizing Flux
Description :
We use a wide-field (0.9 square degree) X-ray sample with optical and GALEX
ultraviolet observations to measure the contribution of Active Galactic Nuclei
(AGNs) to the ionizing flux as a function of redshift. Our analysis shows that
the AGN contribution to the metagalactic ionizing background pea...
Repository :
arXiv
Language(s) :
Undetermined
Active Galactic Nuclei Selected from GALEX Spectroscopy: The Ionizing Source Spectrum at z~1
Description :
We use a complete sample of Lya emission-line selected AGNs obtained from
nine deep blank fields observed with the grism spectrographs on the Galaxy
Evolution Explorer (GALEX) satellite to measure the normalization and spectral
shape of the AGN contribution to the ionizing background (rest-frame
w...
Repository :
arXiv
Language(s) :
Undetermined
The OPTX Project V: Identifying Distant AGNs
Description :
The Baldwin, Phillips, and Terlevich emission-line ratio diagnostic
([OIII]/H{\beta} versus [NII]/H{\alpha}, hereafter BPT diagram) efficiently
separates galaxies whose signal is dominated by star formation from
those dominated by AGN activity (BPT-AGN). Yet this BPT diagram is limited to...
Repository :
arXiv
Language(s) :
Undetermined
The Faintest X-ray Sources from z=0-8
Description :
We use the new 4 Ms exposure of the CDF-S field obtained with the Chandra
X-ray satellite to investigate the properties of the faintest X-ray sources
over a wide range of redshifts. We use an optimized averaging procedure to
investigate the weighted mean X-ray fluxes of optically selected sources ...
Repository :
arXiv
Language(s) :
Undetermined
Mapping the Evolution of High Redshift Dusty Galaxies with Submillimeter Observations of a Radio-Selected Sample
Description :
Direct submm imaging has recently revealed the 850-micron background to be
mostly composed of a population of distant ultraluminous infrared galaxies, but
identifying the optical/NIR counterparts to these sources has proved difficult
due to the poor submm spatial resolution. However, the proportio...
Repository :
arXiv
Language(s) :
Undetermined
Faint Submillimeter Counts from Deep 850 Micron Observations of the Lensing Clusters A370, A851, and A2390
Description :
We present deep 850 micron maps of three massive lensing clusters, A370,
A851, and A2390, with well-constrained mass models. Our cluster exposure times
are more than 2 to 5 times longer than any other published cluster field
observations. We catalog the sources and determine the submillimeter numb...
Repository :
arXiv
Language(s) :
Undetermined