Candels/Goods-S, Cdfs, and Ecdfs: Photometric Redshifts for Normal and X-Ray-Detected Galaxies

Hsu, Li-Ting; Salvato, M.; Nandra, K.; Brusa, M.; Bender, R.; Buchner, Johannes; Donley, J. L.; Kocevski, Dale D.; Guo, Y.; Hathi, N. P.; Rangel, C.; Willner, S. P.; Brightman, Murray; Georgakakis, A.; Budavàri, Tamás; Szalay, Alexander S.; Ashby, M. L. N.; Barro, Guillermo; Dahlén, T.; Faber, S. M.; Ferguson, Henry C.; Galametz, A.; Grazian, A.; Grogin, Norman A.; Huang, Kuang-Han; Koekemoer, Anton M.; Lucas, Ray A.; McGrath, Elizabeth J.; Mobasher, Bahram; Peth, Michael; Rosario, D. J.; Trump, Jonathan R.

doi:10.1088/0004-637x/796/1/60

Cited by 132 publications

(235 citation statements)

References 57 publications

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“…the 68 per cent confidence intervals) on our photo-z are also comparable to the residuals between our best photo-z estimate and the available spectroscopic redshifts, in contrast to most previous work where errors may be underestimated by a factor ∼ 2 − 6 (e.g. Luo et al 2010;Hsu et al 2014). Furthermore, we require the full p(z) distribution, which most prior studies do not provide.…”

Section: Photometric Redshiftssupporting

confidence: 82%

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The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼ 5

Aird

Coil

Georgakakis

et al. 2015

Monthly Notices of the Royal Astronomical Society

360

559

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We present new measurements of the evolution of the X-ray luminosity functions (XLFs) of unabsorbed and absorbed Active Galactic Nuclei (AGNs) out to z ∼ 5. We construct samples containing 2957 sources detected at hard (2-7 keV) X-ray energies and 4351 sources detected at soft (0.5-2 keV) energies from a compilation of Chandra surveys supplemented by wide-area surveys from ASCA and ROSAT. We consider the hard and soft X-ray samples separately and find that the XLF based on either (initially neglecting absorption effects) is best described by a new flexible model parametrization where the break luminosity, normalization and faint-end slope all evolve with redshift. We then incorporate absorption effects, separately modelling the evolution of the XLFs of unabsorbed (20 < log N H < 22) and absorbed (22 < log N H < 24) AGNs, seeking a model that can reconcile both the hard-and soft-band samples. We find that the absorbed AGN XLF has a lower break luminosity, a higher normalization, and a steeper faint-end slope than the unabsorbed AGN XLF out to z ∼ 2. Hence, absorbed AGNs dominate at low luminosities, with the absorbed fraction falling rapidly as luminosity increases. Both XLFs undergo strong luminosity evolution which shifts the transition in the absorbed fraction to higher luminosities at higher redshifts. The evolution in the shape of the total XLF is primarily driven by the changing mix of unabsorbed and absorbed populations.

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Section: Photometric Redshiftssupporting

confidence: 82%

“…Barger et al 2003;Cardamone et al 2010a;Hsu et al 2014). Many of these studies take additional steps to improve the quality of the photo-z estimates.…”

Section: Photometric Redshiftsmentioning

confidence: 99%

The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼ 5

Aird

Coil

Georgakakis

et al. 2015

Monthly Notices of the Royal Astronomical Society

360

559

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“…from PRIMUS, Coil et al 2011, or 3DHST, Momcheva et al 2016) and photometric redshifts (including high quality AGN photo-z, where available, from Hsu et al 2014;Nandra et al 2015;Marchesi et al 2016) for sources in our NIR-selected catalogues. Rest-frame colours are calculated using EaZY (Brammer et al 2011).…”

Section: Data and Sample Selectionmentioning

confidence: 99%

X-rays across the galaxy population – II. The distribution of AGN accretion rates as a function of stellar mass and redshift

Aird

Coil

Georgakakis

2017

Monthly Notices of the Royal Astronomical Society

160

266

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We use deep Chandra X-ray imaging to measure the distribution of specific black hole accretion rates (L X relative to the stellar mass of the galaxy) and thus trace AGN activity within star-forming and quiescent galaxies, as a function of stellar mass (from 10 8.5 -10 11.5 M ⊙ ) and redshift (to z ∼ 4). We adopt near-infrared selected samples of galaxies from the CANDELS and UltraVISTA surveys, extract X-ray data for every galaxy, and use a flexible Bayesian method to combine these data and to measure the probability distribution function of specific black hole accretion rates, λ sBHAR . We identify a broad distribution of λ sBHAR in both starforming and quiescent galaxies-likely reflecting the stochastic nature of AGN fuelling-with a roughly power-law shape that rises toward lower λ sBHAR , a steep cutoff at λ sBHAR 0.1−1 (in Eddington equivalent units), and a turnover or flattening at λ sBHAR 10 −3 − 10 −2 . We find that the probability of a star-forming galaxy hosting a moderate λ sBHAR AGN depends on stellar mass and evolves with redshift, shifting toward higher λ sBHAR at higher redshifts. This evolution is truncated at a point corresponding to the Eddington limit, indicating black holes may self-regulate their growth at high redshifts when copious gas is available. The probability of a quiescent galaxy hosting an AGN is generally lower than that of a star-forming galaxy, shows signs of suppression at the highest stellar masses, and evolves strongly with redshift. The AGN duty cycle in high-redshift (z 2) quiescent galaxies thus reaches ∼20 per cent, comparable to the duty cycle in star-forming galaxies of equivalent stellar mass and redshift.

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“…As Figure 14 (left) shows, as survey area increases and the effective flux limits of the surveys become shallower, the detected sources are preferentially at higher luminosity at every redshift. This is further illustrated in Figure 14 (right), which compares the normalized luminosity distribution of Stripe 82X with COSMOS and CDFS, highlighting the complementarity of the different survey strategies in preferentially identifying sources within different luminosity ranges (see, e.g., Hsu et al 2014). Wide-area surveys which explore a large volume of the universe, like Stripe 82X, are necessary to discover rare objects that have a low space density, including the highest luminosity quasars.…”

Section: The L -Z Plane Probed By Stripe 82xmentioning

confidence: 83%

THE 31 DEG² RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

LaMassa

Urry²,

Cappelluti

et al. 2016

ApJ

Self Cite

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We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg 2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are significantly detected with XMM-Newton (>5σ) and Chandra (>4.5σ). This catalog release includes data from XMM-Newton cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are 8.7×10 −16 erg s −1 cm −2 , 4.7×10 −15 erg s −1 cm −2 , and 2.1×10 −15 erg s −1 cm −2 in the soft (0.5-2 keV), hard (2-10 keV), and full bands (0.5-10 keV), respectively, with approximate half-area survey flux limits of 5.4×10 −15 erg s −1 cm −2 , 2.9×10 −14 erg s −1 cm −2 , and 1.7×10 −14 erg s −1 cm −2 . We matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared WISE coverage, near-infrared coverage from UKIDSS and VISTA Hemisphere Survey, ultraviolet coverage from GALEX, radio coverage from FIRST, and far-infrared coverage from Herschel, as well as existing ∼30% optical spectroscopic completeness, we are beginning to uncover rare objects, such as obscured high-luminosity active galactic nuclei at high-redshift. The Stripe 82X point source catalog is a valuable data set for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live.

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Candels/Goods-S, Cdfs, and Ecdfs: Photometric Redshifts for Normal and X-Ray-Detected Galaxies

Cited by 132 publications

References 57 publications

The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼ 5

The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼ 5

X-rays across the galaxy population – II. The distribution of AGN accretion rates as a function of stellar mass and redshift

THE 31 DEG² RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

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Candels/Goods-S, Cdfs, and Ecdfs: Photometric Redshifts for Normal and X-Ray-Detected Galaxies

Cited by 132 publications

References 57 publications

The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼ 5

The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼ 5

X-rays across the galaxy population – II. The distribution of AGN accretion rates as a function of stellar mass and redshift

THE 31 DEG2 RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG

Contact Info

Product

Resources

About

THE 31 DEG² RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG