J/A+A/424/545 Optically faint obscured quasars (Padovani+, 2004)
Discovery of optically faint obscured quasars with Virtual Observatory tools.
Padovani P., Allen M.G., Rosati P., Walton N.A.
<Astron. Astrophys., 424, 545-559 (2004)>
=2004A&A...424..545P 2004A&A...424..545P
ADC_Keywords: QSOs ; Active gal. nuclei ; X-ray sources
Keywords: astronomical data bases: miscellaneous - methods: statistical -
galaxies: quasars: general - X-rays: galaxies
Abstract:
We use Virtual Observatory (VO) tools to identify optically faint,
obscured (i.e., type 2) active galactic nuclei (AGN) in the two Great
Observatories Origins Deep Survey (GOODS) fields. By employing
publicly available X-ray and optical data and catalogues we discover
68 type 2 AGN candidates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 47 Type 2 AGN candidates, HDF-N
table2.dat 90 21 Type 2 AGN candidates, CDF-S
table4.dat 90 3 Type 2 AGN candidates, UDF
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See also:
J/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003)
J/ApJS/155/271 : Chandra Deep Field-South: Optical spectroscopy (Szokoly+ 2004)
II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004)
II/261 : GOODS initial results (Giavalisco+, 2004)
Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- GOODS GOODS designation (JHHMMSS.ss+DDMMSS.s)
22- 25 I4 --- UDF ? UDF designation (Cat. II/258, table 4 only)
27- 29 I3 --- A03 Alexander et al. (2003, Cat. J/AJ/126/539
sequential number, [ABB2003] CDFN NNN (table1)
or [ABB2003] CDFS NNN (table2&3) in Simbad
31- 33 I3 --- S04 ? Szokoly et al. (2004, Cat. J/ApJS/155/271
sequential number, [SBH2004] XID NNNa in Simbad
(table2 only)
34 A1 --- m_S04 [a] Multiplicity index on S04
35- 36 I2 h RAh Right ascension (J2000.0)
38- 39 I2 min RAm Right ascension (J2000.0)
41- 45 F5.2 s RAs Right ascension (J2000.0)
47 A1 --- DE- Declination sign (J2000.0)
48- 49 I2 deg DEd Declination (J2000.0)
51- 52 I2 arcmin DEm Declination (J2000.0)
54- 57 F4.1 arcsec DEs Declination (J2000.0)
59- 62 F4.2 arcsec Offset Offset between X-ray and optical positions
64- 68 F5.2 aW/m2 Flux ? Flux in the 0.5-8keV band (10-15erg/cm2/s)
70- 74 F5.2 --- HR ? Hardness ratio, HR=(H-S)/(H+S) (1)
76- 80 F5.2 mag imag ACS i magnitude
82- 85 F4.2 mag e_imag rms uncertainty on imag
87- 90 F4.1 [10-7W] logLX X-ray luminosity in 2-8keV band
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Note (1): Where H=(2.0-8.0keV) counts and S=(0.5-2.0keV) counts.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-May-2006