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J/ApJ/742/61 Photometric redshift of AGNs from XMM- and C-COSMOS (Salvato+ 2011)

Dissecting photometric redshift for active galactic nucleus using XMM- and Chandra-COSMOS samples. Salvato M., Ilbert O., Hasinger G., Rau A., Civano F., Zamorani G., Brusa M., Elvis M., Vignali C., Aussel H., Comastri A., Fiore F., Le Floc'h E., Mainieri V., Bardelli S., Bolzonella M., Bongiorno A., Capak P., Caputi K., Cappelluti N., Carollo C.M., Contini T., Garilli B., Iovino A., Fotopoulou S., Fruscione A., Gilli R., Halliday C., Kneib J.-P., Kakazu Y., Kartaltepe J.S., Koekemoer A.M., Kovac K., Ideue Y., Ikeda H., Impey C.D., Le Fevre O., Lamareille F., Lanzuisi G., Le Borgne J.-F., Le Brun V., Lilly S., Maier C., Manohar S., Masters D., McCracken H., Messias H., Mignoli M., Mobasher B., Nagao T., Pello R., Puccetti S., Perez-Montero E., Renzini A., Sargent M., Sanders D.B., Scodeggio M., Scoville N., Shopbell P., Silverman J., Taniguchi Y., Tasca L., Tresse L., Trump J.R., Zucca E. <Astrophys. J., 742, 61 (2011)> =2011ApJ...742...61S
ADC_Keywords: Active gal. nuclei ; Surveys ; X-ray sources ; Redshifts Keywords: galaxies: active - galaxies: distances and redshifts - surveys - methods: data analysis - techniques: photometric - X-rays: galaxies Abstract: In this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of the Cosmic Evolution Survey (COSMOS) field. The availability of a large training set of spectroscopic redshifts that extends to faint magnitudes enabled photometric redshifts comparable to the highest quality results presently available for normal galaxies. We demonstrate that morphologically extended, faint X-ray sources without optical variability are more accurately described by a library of normal galaxies (corrected for emission lines) than by active galactic nucleus (AGN) dominated templates, even if these sources have AGN-like X-ray luminosities. Preselecting the library on the bases of the source properties allowed us to reach an accuracy σΔz/(1+zspec)∼0.015 with a fraction of outliers of 5.8% for the entire Chandra-COSMOS sample. In addition, we release revised photometric redshifts for the 1735 optical counterparts of the XMM-detected sources over the entire 2deg2 of COSMOS. For 248 sources, our updated photometric redshift differs from the previous release by Δz>0.2. These changes are predominantly due to the inclusion of newly available deep H-band photometry (HAB=24mag). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 56 1694 Extracted from C-COSMOS photometric redshift catalog table5.dat 56 1735 Extracted from XMM-COSMOS photometric redshift catalog
See also: II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012) J/A+A/542/A16 : X-ray detection of radio-selected SF galaxies (Ranalli+, 2012) J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010) J/A+A/512/A34 : XMM-COSMOS Type 1 AGNs (Lusso+, 2010) J/ApJ/693/8 : High-redshift QSOs in the COSMOS survey (Brusa+, 2009) J/ApJ/696/1195 : COSMOS AGN spectroscopic survey. I. (Trump+, 2009) J/A+A/497/635 : XMM-Newton survey in COSMOS field (Cappelluti+, 2009) J/ApJ/680/939 : Optical spectra of 24um galaxies in COSMOS. I. (Caputi+, 2008) J/ApJS/172/523 : COSMOS field Lyα emitters at z∼5.7 (Murayama+, 2007) J/ApJS/172/383 : AGN candidates in the COSMOS field (Trump+, 2007) J/ApJS/172/368 : XMM-Newton survey in COSMOS field. IV. (Mainieri+, 2007) J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007) J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007) : COSMOS home page : COSMOS archive : XMM- C-COSMOS photometric z cat. Byte-by-byte Description of file: table[45].dat
Bytes Format Units Label Explanations
1- 6 I6 --- XID [1/100382] X-ray identifier (1) 8- 14 I7 --- OID ?=-99 Optical counterpart identifier (2) 16- 20 F5.3 --- zph [0/7] Photometric redshift (0=star) 22- 26 F5.3 --- b_zph Lower value on zph 27 A1 --- n_zph [*] Lower value forced (5) 28- 32 F5.3 --- B_zph Upper value on zph 33 A1 --- f_zph [*] Upper value forced (5) 34- 40 F7.3 --- PDFz [14.06/100.1]?=-99 Redshift probability distribution 42- 44 I3 --- Temp [1/131]?=-99 Best-fit template (3) 47- 49 I3 --- Cl [1/4]?=-99 Morphological classification (4) 51- 56 F6.2 mag VAR [0/2.1]?=-99 Variability parameter defined as Eq.(1) in Salvato et al. 2009ApJ...690.1250S
Note (1): Chandra identifier from Civano et al. 2012, Cat. J/ApJS/201/30, (Col. CID; <CXOC JHHMMSS.s+DDMMSS> in Simbad) for table 4. XMM identifier from Brusa et al. 2010, Cat. J/ApJ/716/348, <XMMC NNNNNN> in Simbad for table 5. Note (2): As reported in the photo-z catalog (Ilbert et al. 2009ApJ...690.1236I; Column 2) and in the photometric catalog "cosmosphot20081101" available in the COSMOS web page: Note (3): Best-fit template: from 1 to 31 the templates are from Salvato et al. 2009ApJ...690.1250S, templates from 100+(1...30) are from the Ilbert et al. 2009ApJ...690.1236I library. Note (4): From Leauthaud et al. 2007ApJS..172..219L. 1 or 3 indicates extended sources, while 2 or 4 indicates point-like sources. Note (5): The asterisk, in table5 only, was added at CDS when the limit value was changed; see the "History" section below.
History: * 24-Oct-2012: From electronic version of the journal * 13-Dec-2012: In table5, 3 lower values of zph, higher than the actual zph, were forced to zph value (records#153, 872 and 907). Similarly, 5 upper values of zph, lower than the actual zph, were forced to zph value (records# 66, 435, 456, 733, 955)
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Oct-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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