scholarly journals The Properties and Redshift Evolution of Intermediate-Luminosity Off-Nuclear X-Ray Sources in the Chandra Deep Fields

2006 ◽  
Vol 131 (5) ◽  
pp. 2394-2405 ◽  
Author(s):  
B. D. Lehmer ◽  
W. N. Brandt ◽  
A. E. Hornschemeier ◽  
D. M. Alexander ◽  
F. E. Bauer ◽  
...  
Keyword(s):  
X Ray ◽  
Deep Fields

scholarly journals The deep Chandra survey in the SDSS J1030+0524 field

2020 ◽  
Vol 637 ◽  
pp. A52 ◽  
Author(s):  
R. Nanni ◽  
R. Gilli ◽  
C. Vignali ◽  
M. Mignoli ◽  
A. Peca ◽  
...  
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Cumulative Number ◽  
Imaging Data ◽  
X Ray ◽  
Large Scale Structures ◽  
Multi Wavelength ◽  
Deep Fields ◽  
Initial Source

We present the X-ray source catalog for the ∼479 ks Chandra exposure of the SDSS J1030+0524 field, which is centered on a region that shows the best evidence to date of an overdensity around a z > 6 quasar, and also includes a galaxy overdensity around a Compton-thick Fanaroff-Riley type II (FRII) radio galaxy at z = 1.7. Using wavdetect for initial source detection and ACIS Extract for source photometry and significance assessment, we create preliminary catalogs of sources that are detected in the full (0.5−7.0 keV), soft (0.5−2.0 keV), and hard (2−7 keV) bands, respectively. We produce X-ray simulations that mirror our Chandra observation to filter our preliminary catalogs and achieve a completeness level of > 91% and a reliability level of ∼95% in each band. The catalogs in the three bands are then matched into a final main catalog of 256 unique sources. Among them, 244, 193, and 208 are detected in the full, soft, and hard bands, respectively. The Chandra observation covers a total area of 335 arcmin2 and reaches flux limits over the central few square arcmins of ∼3 × 10−16, 6 × 10−17, and 2 × 10−16 erg cm−2 s−1 in the full, soft, and hard bands, respectively This makes J1030 field the fifth deepest extragalactic X-ray survey to date. The field is part of the Multiwavelength Survey by Yale-Chile (MUSYC), and is also covered by optical imaging data from the Large Binocular Camera (LBC) at the Large Binocular Telescope (LBT), near-infrared imaging data from the Canada France Hawaii Telescope WIRCam (CFHT/WIRCam), and Spitzer IRAC. Thanks to its dense multi-wavelength coverage, J1030 represents a legacy field for the study of large-scale structures around distant accreting supermassive black holes. Using a likelihood ratio analysis, we associate multi-band (r, z, J, and 4.5 μm) counterparts for 252 (98.4%) of the 256 Chandra sources, with an estimated reliability of 95%. Finally, we compute the cumulative number of sources in each X-ray band, finding that they are in general agreement with the results from the Chandra Deep Fields.

scholarly journals Obscured AGN

2013 ◽  
Vol 9 (S304) ◽  
pp. 43-43
Author(s):  
Amy Barger
Keyword(s):  
Growth Rate ◽  
Black Hole ◽  
Substantial Fraction ◽  
X Ray ◽  
James Clerk Maxwell ◽  
Supermassive Black Hole ◽  
Black Hole Growth ◽  
Deep Fields ◽  
Hole Growth

AbstractObscured AGN may correspond to a substantial fraction of the supermassive black hole growth rate. I will present new surveys with the SCUBA-2 instrument on the James Clerk Maxwell Telescope of the Chandra Deep Fields and discuss whether we can distinguish obscured AGN in hard X-ray and radio selected samples using submillimeter observations.

scholarly journals Piercing through Highly Obscured and Compton-thick AGNs in the Chandra Deep Fields. I. X-Ray Spectral and Long-term Variability Analyses

2019 ◽  
Vol 877 (1) ◽  
pp. 5 ◽  
Author(s):  
Junyao Li ◽  
Yongquan Xue ◽  
Mouyuan Sun ◽  
Teng Liu ◽  
Fabio Vito ◽  
...  
Keyword(s):  
X Ray ◽  
Deep Fields

scholarly journals Most Hard‐X‐Ray–Selected Quasars in the Chandra Deep Fields are Obscured

2007 ◽  
Vol 657 (1) ◽  
pp. 95-101 ◽  
Author(s):  
J. X. Wang ◽  
P. Jiang ◽  
Z. Y. Zheng ◽  
P. Tozzi ◽  
C. Norman ◽  
...  
Keyword(s):  
X Ray ◽  
Deep Fields

scholarly journals The X‐Ray–derived Cosmological Star Formation History and the Galaxy X‐Ray Luminosity Functions in the Chandra Deep Fields North and South

2004 ◽  
Vol 607 (2) ◽  
pp. 721-738 ◽  
Author(s):  
Colin Norman ◽  
Andrew Ptak ◽  
Ann Hornschemeier ◽  
Guenther Hasinger ◽  
Jacqueline Bergeron ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
X Ray ◽  
Luminosity Functions ◽  
Formation History ◽  
The Galaxy ◽  
Deep Fields ◽  
North And South

scholarly journals The Future of X-Ray Time-Domain Surveys

2011 ◽  
Vol 7 (S285) ◽  
pp. 199-206
Author(s):  
Daryl Haggard ◽  
Gregory R. Sivakoff
Keyword(s):  
Time Domain ◽  
Gamma Ray ◽  
High Energy ◽  
Galactic Centre ◽  
Time Resolved ◽  
X Ray ◽  
Stellar Flares ◽  
Time Domain Data ◽  
Deep Fields ◽  
Energy Dependent

AbstractModern X-ray observatories yield unique insight into the astrophysical time domain. Each X-ray photon can be assigned an arrival time, an energy and a sky position, yielding sensitive, energy-dependent light curves and enabling time-resolved spectra down to millisecond time-scales. Combining those with multiple views of the same patch of sky (e.g., in the Chandra and XMM-Newton deep fields) so as to extend variability studies over longer baselines, the spectral timing capacity of X-ray observatories then stretch over 10 orders of magnitude at spatial resolutions of arcseconds, and 13 orders of magnitude at spatial resolutions of a degree. A wealth of high-energy time-domain data already exists, and indicates variability on timescales ranging from microseconds to years in a wide variety of objects, including numerous classes of AGN, high-energy phenomena at the Galactic centre, Galactic and extra-Galactic X-ray binaries, supernovæ, gamma-ray bursts, stellar flares, tidal disruption flares, and as-yet unknown X-ray variables. This workshop explored the potential of strategic X-ray surveys to probe a broad range of astrophysical sources and phenomena. Here we present the highlights, with an emphasis on the science topics and mission designs that will drive future discovery in the X-ray time domain.

scholarly journals The unresolved hard X-ray background: the missing source population implied by the Chandra and XMM--Newton deep fields

2005 ◽  
Vol 357 (4) ◽  
pp. 1281-1287 ◽  
Author(s):  
M. A. Worsley ◽  
A. C. Fabian ◽  
F. E. Bauer ◽  
D. M. Alexander ◽  
G. Hasinger ◽  
...  
Keyword(s):  
Source Population ◽  
X Ray ◽  
Deep Fields ◽  
X Ray Background

scholarly journals Conference Summary

2002 ◽  
Vol 184 ◽  
pp. 411-422 ◽  
Author(s):  
D. B. Sanders
Keyword(s):  
Far Infrared ◽  
Astronomical Observatory ◽  
Redshift Distribution ◽  
X Ray ◽  
Conference Summary ◽  
The Past ◽  
Deep Fields ◽  
Significant Milestone

AbstractThis conference on AGN Surveys has proved to be a significant milestone in our understanding of the redshift distribution of optically selected QSOs, and in our initial understanding of the cosmic distribution of AGN from the first far-infrared and X-ray deep fields. It has also set the stage for continuing debates concerning the multiwave-length properties of AGN, the cosmological distribution of “obscured” AGN, and the “orientation versus evolution” debate on the nature of the sources discovered at different wavelengths. Much of this debate could have been anticipated from previous studies of the complete samples of optically-selected AGN provided to us by the pioneering work carried out by the staff of the Byurakan Astronomical Observatory over the past 40 years.

scholarly journals Mock catalogs for the extragalactic X-ray sky: Simulating AGN surveys with ATHENA and with the AXIS probe

2020 ◽  
Vol 642 ◽  
pp. A184
Author(s):  
S. Marchesi ◽  
R. Gilli ◽  
G. Lanzuisi ◽  
T. Dauser ◽  
S. Ettori ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Cosmic Time ◽  
Galactic Nuclei ◽  
Theoretical Models ◽  
X Rays ◽  
X Ray ◽  
Flux Limit ◽  
Order Of Magnitude ◽  
Deep Fields ◽  
First Time

We present a series of new, publicly available mock catalogs of X-ray selected active galactic nuclei (AGNs), nonactive galaxies, and clusters of galaxies. These mocks are based on up-to-date observational results on the demographic of extragalactic X-ray sources and their extrapolations. They reach fluxes below 10−20 erg cm−2 s−1 in the 0.5–2 keV band, that is, more than an order of magnitude below the predicted limits of future deep fields, and they therefore represent an important tool for simulating extragalactic X-ray surveys with both current and future telescopes. We used our mocks to perform a set of end-to-end simulations of X-ray surveys with the forthcoming ATHENA mission and with the AXIS probe, a subarcsecond resolution X-ray mission concept proposed to the Astro 2020 Decadal Survey. We find that these proposed, next generation surveys may transform our knowledge of the deep X-ray Universe. As an example, in a total observing time of 15 Ms, AXIS would detect ∼225 000 AGNs and ∼50 000 nonactive galaxies, reaching a flux limit of f0.5−2 ∼ 5 × 10−19 erg cm−2 s−1 in the 0.5–2 keV band, with an improvement of over an order of magnitude with respect to surveys with current X-ray facilities. Consequently, 90% of these sources would be detected for the first time in the X-rays. Furthermore, we show that deep and wide X-ray surveys with instruments such as AXIS and ATHENA are expected to detect ∼20 000 z > 3 AGNs and ∼250 sources at redshift z > 6, thus opening a new window of knowledge on the evolution of AGNs over cosmic time and putting strong constraints on the predictions of theoretical models of black hole seed accretion in the early universe.

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