THE CHANDRA COSMOS LEGACY SURVEY: OVERVIEW AND POINT SOURCE CATALOG

By F. Civano, S. Marchesi, A. Comastri, M. Urry, M. Elvis, N. Cappelluti, S. Puccetti, M. Brusa, G. Zamorani, G. Hasinger and 32 more. 2016

252 citations recorded by the source corpus.

The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg2 of the COSMOS field with an effective exposure of ≃ 160 ?> ks over the central 1.5 deg2 and of ≃ 80 ?> ks in the remaining area. The survey is the combination of 56 new observations obtained as an X-ray Visionary Project with the previous C-COSMOS survey. We describe the reduction and analysis of the new observations and the properties of 2273 point sources detected above a spurious probability of 2 × 10−5. We also present the updated properties of the C-COSMOS sources detected in the new data. The whole survey includes 4016 point sources (3814, 2920 and 2440 in the full, soft, and hard band). The limiting depths are 2.2 × 10−16, 1.5 × 10−15, and 8.9 × 10−16 erg cm − 2 s − 1 ?> in the 0.5–2, 2–10, and 0.5–10 keV bands, respectively. The observed fraction of obscured active galactic nuclei with a column density >1022 cm−2 from the hardness ratio (HR) is ∼50 − 16 + 17 ?> %. Given the large sample we compute source number counts in the hard and soft bands, significantly reducing the uncertainties of 5%–10%. For the first time we compute number counts for obscured (HR > −0.2) and unobscured (HR < −0.2) sources and find significant differences between the two populations in the soft band. Due to the unprecedent large exposure, COSMOS-Legacy area is three times larger than surveys at similar depths and its depth is three times fainter than surveys covering similar areas. The area-flux region occupied by COSMOS-Legacy is likely to remain unsurpassed for years to come.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Computational Mechanics

View Paper: https://www.semanticscholar.org/paper/8b8a76d80df368b9907494877d091f103f6b0cc8

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Citations in the corpus

x-cigale: fitting AGN/galaxy SEDs from X-ray to infrared (2020, methodology): “(iv) We also test X-CIGALE on a random sample of galaxies with only Chandra X-ray upper limits in the AKARI-NEP field, where excellent MIR data are available (§4).”
Titans of the early Universe: The Prato statement on the origin of the first supermassive black holes (2018, methodology): “The use of deep X-ray surveys such as Chandra COSMOS Legacy (Civano et al. 2016) has provided a few more candidates (e.g., Schramm et al. 2013; Pardo et al. 2016; Mezcua et al. 2018a) as well as observational evidence that a population of IMBHsmust exist in dwarf galaxies, at least out to z ∼1.5…”
The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release (2017, background): “…2007; Elvis et al. 2009; Ilbert et al. 2013; McCracken et al. 2012; Scott et al. 2008; Aretxaga et al. 2011; Smolčić et al. 2012; Miettinen et al. 2015; Civano et al. 2016; Laigle et al. 2016, Capak et al., in prep.) and more than 97 000 optical spectroscopic redshifts (Salvato et al., in prep.”
The ALPINE-ALMA [CII] survey (2020, methodology): “…deep NIR YJHK imaging from the UltraVista Survey (McCracken et al. 2012), SPITZER 3.6 and 4.5 µm imaging (Sanders et al. 2007), with good X-ray coverage with both XMM-Newton (Hasinger et al. 2007) and Chandra (Elvis et al. 2009; Civano et al. 2016), as well as radio waves (Smolčić et al. 2017).”
Observational evidence for intermediate-mass black holes (2017, methodology): “…technique to a sample of ∼50,000 starburst and late-type dwarf galaxies up to redshift ∼1.5 in the Chandra COSMOS Legacy survey (2.2 deg2, 4.6 Ms; Civano et al. 2016), finding also an X-ray excess that can be explained by accreting BHs with MBH ∼ 105 M and X-ray luminosities as low as 1039 erg…”