The Chandra Cosmos Legacy Survey: Optical/Ir Identifications

Marchesi, S.; Civano, F.; Elvis, M.; Salvato, M.; Brusa, M.; Comastri, A.; Gilli, R.; Hasinger, G.; Lanzuisi, G.; Miyaji, Takeshi; Treister, Ezequiel; Urry, C. Megan; Vignali, C.; Zamorani, G.; Allevato, V.; Cappelluti, N.; Cardamone, Carolin N.; Finoguenov, A.; Griffiths, R. E.; Karim, A.; Laigle, C.; LaMassa, Stephanie; Jahnke, K.; Ranalli, P.; Schawinski, Kevin; Schinnerer, E.; Silverman, John D.; Smolčić, Vernesa; Suh, Hyewon; Trakhtenbrot, Benny

doi:10.3847/0004-637x/817/1/34

Cited by 312 publications

(474 citation statements)

References 134 publications

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“…Matthee et al (2017) argue that the excess of the bright end of luminosity function is caused by AGNs and for HAEs at z ∼1.47 and 2.2 the fraction of X-ray sources in the HAEs monotonically increases with the Hα luminosity at L(Hα) > 10 42.5 erg s −1 irrespective of redshift (see also Sobral et al 2016). On the other hand, as described in §3.5, matching our samples of emission-line galaxies to the catalog of the Chandra X-ray sources in the COSMOS field (Marchesi et al 2016) indicates that at most 0.1% of the emission-line galaxies are detected in X-ray as well. The fraction of O2Es with an X-ray counterpart is similar to that for HAEs and O3Es.…”

Section: Bright End Of Luminosity Functionmentioning

confidence: 88%

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A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

Hayashi¹,

Tanaka²,

Shimakawa³

et al. 2017

Publications of the Astronomical Society of Japan

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We present initial results from the Subaru Strategic Program (SSP) with Hyper Suprime-Cam (HSC) on a comprehensive survey of emission-line galaxies at z < 1.5 based on narrowband imaging. The first Public Data Release (PDR1) provides us with data from two narrowband filters, specifically NB816 and NB921 over 5.7 deg 2 and 16.2 deg 2 respectively. The 5σ limiting magnitudes are 25.2 (UltraDeep layer, 1.4 deg 2 ) and 24.8 (Deep layer, 4.3 deg 2 ) mag in NB816, and 25.1 (UltraDeep, 2.9 deg 2 ) and 24.6-24.8 (Deep, 13.3 deg 2 ) mag in NB921. The wide-field imaging allows us to construct unprecedentedly large samples of 8,054 Hα emitters c 2017. Astronomical Society of Japan. 2Publications of the Astronomical Society of Japan, (2017), Vol. 00, No. 0 at z ≈ 0. 25 and 0.40, 8,656 [OIII] emitters at z ≈ 0. 63 and 0.84, and 16,877 [OII] emitters at z ≈ 1.19 and 1.47. We map the cosmic web on scales out to about 50 comoving Mpc that includes galaxy clusters, identified by red sequence galaxies, located at the intersection of filamentary structures of star-forming galaxies. The luminosity functions of emission-line galaxies are measured with precision and consistent with published studies. The wide field coverage of the data enables us to measure the luminosity functions up to brighter luminosities than previous studies. The comparison of the luminosity functions between the different HSC-SSP fields suggests that a survey volume of > 5 × 10 5 Mpc 3 is essential to overcome cosmic variance. Since the current data have not reached the full depth expected for the HSC-SSP, the color cut in i−NB816 or z−NB921 induces a bias towards star-forming galaxies with large equivalent widths, primarily seen in the stellar mass functions for the Hα emitters at z ≈ 0.25-0.40. Even so, the emission-line galaxies clearly cover a wide range of luminosity, stellar mass, and environment, thus demonstrating the usefulness of the narrowband data from the HSC-SSP to investigate star-forming galaxies at z < 1.5.

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Section: Bright End Of Luminosity Functionmentioning

confidence: 88%

“…The D-COSMOS field is partially covered. Marchesi et al (2016) present the catalog of 4016 X- Table 3. Samples of emission-line galaxies.…”

Section: Agn Contaminationmentioning

confidence: 99%

A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

Hayashi¹,

Tanaka²,

Shimakawa³

et al. 2017

Publications of the Astronomical Society of Japan

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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%

“…We compile high-resolution spectroscopic redshifts (see Skelton et al 2014;Muzzin et al 2013;Aird et al 2015Aird et al , 2017Marchesi et al 2016, and references therein for full details), lowresolution spectroscopic redshifts (i.e. 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.…”

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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“…We used the X-ray point-source catalog from Marchesi et al (2016) (described in detail in Sect. 2) to match the X-ray and radio sources.…”

Section: X-ray Counterpartsmentioning

confidence: 99%

The VLA-COSMOS 3 GHz Large Project: Multiwavelength counterparts and the composition of the faint radio population

Smolčić

Delvecchio

Zamorani

et al. 2017

A&A

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255

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We study the composition of the faint radio population selected from the Karl G. Jansky Very Large Array Cosmic Evolution Survey (VLA-COSMOS) 3 GHz Large Project, which is a radio continuum survey performed at 10 cm wavelength. The survey covers a 2.6 square degree area with a mean rms of ∼2.3 µJy/beam, cataloging 10 830 sources above 5σ, and enclosing the full 2 square degree COSMOS field. By combining these radio data with optical, near-infrared (UltraVISTA), and mid-infrared (Spitzer/IRAC) data, as well as X-ray data (Chandra), we find counterparts to radio sources for ∼93% of the total radio sample reaching out to z 6; these sources are found in the unmasked areas of the COSMOS field, i.e., those not affected by saturated or bright sources in the optical to near-infrared (NIR) bands. We further classify the sources as star-forming galaxies or AGN based on various criteria, such as X-ray luminosity; observed mid-infrared color; UV-far-infrared spectral energy distribution; rest-frame, near-UV optical color that is corrected for dust extinction; and radio excess relative to that expected from the star formation rate of the hosts. We separate the AGN into subsamples dominated by low-to-moderate and moderate-to-high radiative luminosity AGN, i.e., candidates for highredshift analogs to local low-and high-excitation emission line AGN, respectively. We study the fractional contributions of these subpopulations down to radio flux levels of ∼11 µJy at 3 GHz (or ∼20 µJy at 1.4 GHz assuming a spectral index of -0.7). We find that the dominant fraction at 1.4 GHz flux densities above ∼200 µJy is constituted of low-to-moderate radiative luminosity AGN. Below densities of ∼100 µJy the fraction of star-forming galaxies increases to ∼60%, followed by the moderate-to-high radiative luminosity AGN (∼20%) and low-to-moderate radiative luminosity AGN (∼20%). Based on this observational evidence, we extrapolate the fractions down to sensitivities of the Square Kilometer Array (SKA). Our estimates suggest that at the faint flux limits to be reached by the (Wide, Deep, and UltraDeep) SKA1 surveys, a selection based only on radio flux limits can provide a simple tool to efficiently identify samples highly (>75%) dominated by star-forming galaxies.

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The Chandra Cosmos Legacy Survey: Optical/Ir Identifications

Cited by 312 publications

References 134 publications

A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

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

The VLA-COSMOS 3 GHz Large Project: Multiwavelength counterparts and the composition of the faint radio population

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The Chandra Cosmos Legacy Survey: Optical/Ir Identifications

Cited by 312 publications

References 134 publications

A 16 deg2 survey of emission-line galaxies at z &lt; 1.5 in HSC-SSP Public Data Release 1

A 16 deg2 survey of emission-line galaxies at z &lt; 1.5 in HSC-SSP Public Data Release 1

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

The VLA-COSMOS 3 GHz Large Project: Multiwavelength counterparts and the composition of the faint radio population

Contact Info

Product

Resources

About

A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1