J/ApJ/819/62 The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)
The Chandra Cosmos Legacy Survey: overview and point source catalog.
Civano F., Marchesi S., Comastri A., Urry M.C., Elvis M., Cappelluti N.,
Puccetti S., Brusa M., Zamorani G., Hasinger G., Aldcroft T.,
Alexander D.M., Allevato V., Brunner H., Capak P., Finoguenov A., Fiore F.,
Fruscione A., Gilli R., Glotfelty K., Griffiths R.E., Hao H.,
Harrison F.A., Jahnke K., Kartaltepe J., Karim A., Lamassa S.M.,
Lanzuisi G., Miyaji T., Ranalli P., Salvato M., Sargent M., Scoville N.J.,
Schawinski K., Schinnerer E., Silverman J., Smolcic V., Stern D., Toft S.,
Trakhenbrot B., Treister E., Vignali C.
<Astrophys. J., 819, 62 (2016)>
=2016ApJ...819...62C 2016ApJ...819...62C (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Surveys
Keywords: catalogs; cosmology: observations; galaxies: evolution;
quasars: general; surveys; X-rays: general
Abstract:
The COSMOS-Legacy survey is a 4.6Ms Chandra program that has imaged
2.2deg2 of the COSMOS field with an effective exposure of ∼160ks
over the central 1.5deg2 and of ∼80ks 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 2x10-5.
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 2.2x10-16, 1.5x10-15, and 8.9x10-16erg/cm2/s in the
0.5-2, 2-10, and 0.5-10keV bands, respectively. The observed fraction
of obscured active galactic nuclei with a column density >1022/cm2
from the hardness ratio (HR) is ∼50+17-16%. 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.
Description:
The half-a-field shift tiling strategy was designed to uniformly cover
the COSMOS Hubble area in depth and point-spread function (PSF) size
by combining the old C-COSMOS (Elvis+, 2009, J/ApJS/184/158)
observations with the new Chandra ones (see Figure 1). We summarize
the main properties of the new ACIS-I Chandra COSMOS-Legacy
observations in Table 1. The observations took place in four blocks:
2012 November to 2013 January; 2013 March to July; 2013 October to
2014 January; and 2014 March. The mean net effective exposure time per
field was 48.8ks after all the cleaning and reduction operations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 68 COSMOS-Legacy Survey (CLS) observation summary
table5.dat 273 4016 COSMOS-Legacy Survey point source catalog
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See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
J/ApJ/817/172 : X-ray Observations of Stripe 82 (LaMassa+, 2016)
J/ApJS/220/10 : AEGIS-X Deep survey of EGS (AEGIS-XD) (Nandra+, 2015)
J/ApJ/808/185 : NuSTAR surveys: COSMOS catalog (Civano+, 2015)
J/A+A/577/A121 : The XMM-ATLAS catalogues (Ranalli+, 2015)
J/MNRAS/446/911 : X-ray sources in the AKARI NEP deep field (Krumpe+, 2015)
J/MNRAS/443/2590 : The VLA-COSMOS Survey. V. 324MHz (Smolcic+, 2014)
J/MNRAS/436/3581 : X-ray observations of Stripe 82 (LaMassa+, 2013)
J/ApJS/202/6 : XDEEP2 survey catalog (Goulding+, 2012)
J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/A+A/535/A80 : Type-2 QSOs in XMM-COSMOS (Mainieri+, 2011)
J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)
J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)
J/ApJS/185/433 : SWIRE/Chandra survey in Lockman Hole Field (Wilkes+, 2009)
J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)
J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)
J/A+A/497/635 : XMM-Newton wide-field survey in COSMOS (Cappelluti+, 2009)
J/ApJS/179/19 : CDFS survey: 2 Ms source catalogs (Luo+, 2008)
J/ApJS/172/182 : XMM Clusters of galaxies in COSMOS field (Finoguenov+ 2007)
J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)
J/AJ/128/1974 : The VLA-COSMOS survey (Schinnerer+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Field Field identifier (CLS_NN; numbers 1-56)
8- 12 I5 --- ObsID [15207/16562] Chandra observation ID
14- 23 F10.6 deg RAdeg Chandra right ascension (J2000)
25- 32 F8.6 deg DEdeg Chandra declination (J2000)
34- 44 A11 "Y/M/D" Date Observation date
46- 50 I5 s Exp [5439/53051] Exposure time
52- 57 F6.2 deg Roll [48/268] Roll angle
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Chandra source name (1)
11- 20 F10.6 deg RAdeg Chandra Right Ascension (J2000)
22- 29 F8.6 deg DEdeg Chandra Declination (J2000)
31- 33 F3.1 arcsec PosErr [0.1/7] X-ray positional error
35- 41 F7.1 --- Det0.5-7 [-99/30115.7]? Maximum likelihood detection
value in 0.5-7keV band
43- 51 E9.3 ct/s CR0.5-7 [0/0.06] 0.5-7keV count rate
53- 61 E9.3 ct/s e_CR0.5-7 [-99/0.002]? CR0.5-7 uncertainty
63- 70 E8.3 mW/m2 F0.5-10 0.5-10keV flux in erg/s/cm2
72- 79 E8.2 mW/m2 e_F0.5-10 [-99/]? F0.5-10 uncertainty
81- 85 F5.2 --- SN0.5-7 [0/78] 0.5-7keV signal-to-noise ratio
87- 92 F6.2 ks Exp0.5-7 [10/268]? 0.5-7keV exposure time
94- 99 F6.1 ct Cts0.5-7 [3/5440]? 0.5-7keV aperture photometry counts
101-105 F5.1 ct e_Cts0.5-7 [2/95]? Cts0.5-7 uncertainty
107-113 F7.1 --- Det0.5-2 [-99/24570.8]? Maximum likelihood detection
value in 0.5-2keV band
115-123 E9.3 ct/s CR0.5-2 [0/0.05] 0.5-2 keV count rate
125-133 E9.3 ct/s e_CR0.5-2 [-99/0.002]? CR0.5-2 uncertainty
135-143 E9.3 mW/m2 F0.5-2 0.5-2keV flux in erg/s/cm2
145-153 E9.3 mW/m2 e_F0.5-2 [-99/]? F0.5-2 uncertainty
155-159 F5.2 --- SN0.5-2 [0/67] 0.5-2keV signal-to-noise ratio
161-166 F6.2 ks Exp0.5-2 [13/243]? 0.5-2keV exposure time
168-173 F6.1 ct Cts0.5-2 [1/3918]? 0.5-2keV aperture photometry counts
175-179 F5.1 ct e_Cts0.5-2 [2/81]? Cts0.5-2 uncertainty
181-186 F6.1 --- Det2-7 [-99/7830]? Maximum likelihood detection
value in 2-7keV band
188-196 E9.3 ct/s CR2-7 [0/0.02] 2-7keV count rate
198-206 E9.3 ct/s e_CR2-7 [-99/0.0005]? CR2-7 uncertainty
208-216 E9.3 mW/m2 F2-10 2-10keV flux in erg/s/cm2
218-226 E9.3 mW/m2 e_F2-10 [-99/]? F2-10 uncertainty
228-232 F5.2 --- SN2-7 [0.7/41]? 2-7keV signal-to-noise ratio
234-239 F6.2 ks Exp2-7 [21/289]? 2-7keV exposure time
241-246 F6.1 ct Cts2-7 [2/1867]? 2-7keV aperture photometry counts
248-252 F5.1 ct e_Cts2-7 [2/56]? Cts2-7 uncertainty
254-259 F6.2 --- HR [-0.95/0.92]? Hardness Ratio, (H-S)/(H+S)
261-266 F6.2 --- b_HR [-1/1]? Hardness Ratio 90% lower limit
268-273 F6.2 --- B_HR [-1/1]? Hardness Ratio 90% upper limit
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Note (1): "cid_" NNNN, numbers among 1-3811; or "lid_" NNNN,
numbers among 38-6208. The "lid" are the new 2273 sources and
the "cid" are the 1743 sources updated from the C-COSMOS
(Elvis+, 2009, J/ApJS/184/158; in Simbad).
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 18-May-2016