THE COSMOS-WIRCam NEAR-INFRARED IMAGING SURVEY. I. BzK-SELECTED PASSIVE AND STAR-FORMING GALAXY CANDIDATES AT z ≳ 1.4

By H. McCracken, P. Capak, Mara Salvato, H. Aussel, D. Thompson, E. Daddi, D. Sanders, Jean-Paul Kneib, C. Willott, C. Mancini and 11 more. 2009

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We present a new near-infrared survey covering the 2 deg2 COSMOS field conducted using WIRCam at the Canada–France–Hawaii Telescope. By combining our near-infrared data with Subaru B and z images, we construct a deep, wide-field optical–infrared catalog. At Ks < 23 (AB magnitudes), our survey completeness is greater than 90% and 70% for stars and galaxies, respectively, and contains 143,466 galaxies and 13,254 stars. Using the BzK diagram, we divide our galaxy catalog into quiescent and star-forming galaxy candidates. At z ∼ 2, our catalogs contain 3931 quiescent and 25,757 star-forming galaxies representing the largest and most secure sample at these depths and redshifts to date. Our counts of quiescent galaxies turns over at Ks ∼ 22, an effect that we demonstrate cannot be due to sample incompleteness. Both the number of faint and bright quiescent objects in our catalogs exceed the predictions of a recent semi-analytic model of galaxy formation, indicating potentially the need for further refinements in the amount of merging and active galactic nucleus feedback at z ∼ 2 in these models. We measure the angular correlation function for each sample and find that the slope of the field galaxy correlation function flattens to 1.5 by Ks ∼ 23. At small angular scales, the angular correlation function for passive BzK galaxies is considerably in excess of the clustering of dark matter. We use precise 30-band photometric redshifts to derive the spatial correlation length and the redshift distributions for each object class. At Ks < 22, we find rγ/1.80 = 7.0  ±   0.5h−1 Mpc for the passive BzK candidates and 4.7  ±   0.8 h−1 Mpc for the star-forming BzK galaxies. Our pBzK galaxies have an average photometric redshift of zp ∼ 1.4, in approximate agreement with the limited spectroscopic information currently available. The stacked Ks image will be made publicly available from IRSA.

Subfields: Astronomy and Astrophysics, Instrumentation

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Citations in the corpus

• A PUBLIC Ks-SELECTED CATALOG IN THE COSMOS/UltraVISTA FIELD: PHOTOMETRY, PHOTOMETRIC REDSHIFTS, AND STELLAR POPULATION PARAMETERS, (2013, methodology): “We have also not included the J-band imaging of COSMOS from KPNO (Capak et al. 2007), nor the H and Ks imaging from CFHT/WIRCAM (McCracken et al. 2010).”
• Bolometric luminosities and Eddington ratios of X-ray selected active galactic nuclei in the XMM-COSMOS survey (2012, methodology): “2 These data were reduced using similar methods as described in McCracken et al. (2010). c© 0000 RAS, MNRAS000, 000–000”
• DISSECTING PHOTOMETRIC REDSHIFT FOR ACTIVE GALACTIC NUCLEUS USING XMM- AND CHANDRA-COSMOS SAMPLES (2011, methodology): “An additional 15 objects were found in the K-band catalog (McCracken et al. 2010) and aperture photometry were extracted in all broad-band optical/near-IR and COSMOS bands using the K-band images as reference.”
• THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z ∼ 1.6. I. Hα-BASED STAR FORMATION RATES AND DUST EXTINCTION (2013, methodology): “These are sBzK-selected (Daddi et al. 2004) galaxies, from the catalog of McCracken et al. (2010), based on deep near-IR imaging from the Canada-France-Hawaii Telescope withKs < 23, and optical imaging (BJ, z+) from Subaru.”
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS (2012, methodology): “The first-year data set described in this paper is already deeper than all existing COSMOS NIR data (McCracken et al. 2010; Bielby et al. 2012) in all bands by between one and two magnitudes and also contains for the first time deep Y-band imaging.”
• IDENTIFYING LUMINOUS ACTIVE GALACTIC NUCLEI IN DEEP SURVEYS: REVISED IRAC SELECTION CRITERIA (2012, methodology): “To constrain the IRAC colors of BzK-selected galaxies in COSMOS, we adopt the COSMOS BzK catalog of McCracken et al. (2010).”
• Enhanced star formation rates in AGN hosts with respect to inactive galaxies from PEP-Herschel observations (2012, methodology): “The COSMOS optical catalog is supplemented with K photometry from McCracken et al. (2010), IRAC photometry from Sanders et al. (2007) and Ilbert et al. (2009), and 24µm photometry from Le Floc’h et al. (2009).”
• GALAXY CLUSTERING IN THE NEWFIRM MEDIUM BAND SURVEY: THE RELATIONSHIP BETWEEN STELLAR MASS AND DARK MATTER HALO MASS AT 1 < z < 2 (2010, unknown): “…et al. 2002; Brown et al. 2005; Kong et al. 2006, 2009; Kim et al. 2010), BzKs (Kong et al. 2006; Hayashi et al. 2007; Blanc et al. 2008; Hartley et al. 2008; McCracken et al. 2010), and Distant Red Galaxies (DRGs Grazian et al. 2006; Foucaud et al. 2007; Quadri et al. 2007, 2008; Kim et al. 2010).”
• Mass assembly in quiescent and star-forming galaxies since z ≃ 4 from UltraVISTA (2013, background): “The DR1 data are at least one magnitude deeper than previous COSMOS near-infrared datasets (McCracken et al. 2010) and also provide new Y-band photometric information.”
• EVOLUTION OF GALAXIES AND THEIR ENVIRONMENTS AT z = 0.1–3 IN COSMOS (2013, methodology): “This includes HST-ACS F814W (Scoville et al. 2007a), Suprime-Cam on Subaru (Taniguchi et al. 2007) and CFHT-MagaCam/WIRCam (McCracken et al. 2010); near infrared imaging (Y, J, H & Ks) from NOAO-4m, UH88, UKIRT (Capak et al. 2007; McCracken et al. 2010), Ultra-Vista (McCracken et al. 2012); Spitzer ”
• THE CHANDRA COSMOS SURVEY. III. OPTICAL AND INFRARED IDENTIFICATION OF X-RAY POINT SOURCES (2012, methodology): “…counterparts of the C-COSMOS sources in the i-band (0.76µm) using the Subaru photometric catalog (Capak et al. 2007, hereinafter “optical catalog”), in the K-band (2.15µm) using the CFHT/Megacam catalog (McCracken et al. 2010) and at 3.6µm using the Spitzer IRAC catalog (Sanders et al. 2007).”