J/MNRAS/366/171 Red AGN in XMM/SDSS fields (Georgakakis+, 2006)
Red active galactic nuclei in XMM-Newton/Sloan Digital Sky Survey fields.
Georgakakis A.E., Georgantopoulos I., Akylas A.
<Mon. Not. R. Astron. Soc., 366, 171-181 (2006)>
=2006MNRAS.366..171G 2006MNRAS.366..171G
ADC_Keywords: Surveys ; X-ray sources ; Active gal. nuclei
Keywords: surveys - X-rays: galaxies - X-rays: general
Abstract:
In this paper we combine archival and proprietary XMM-Newton
observations (about 5deg2) that overlap with the Sloan Digital Sky
Survey to explore the nature of the moderate-z X-ray population. We
focus on X-ray sources with optically red colours (g-r>0.4), which we
argue are important for understanding the origin of the X-ray
background (XRB).
Description:
In this paper, we use 28 XMM-Newton archival observations selected to
overlap with the second data release of the SDSS (DR2, Stoughton et
al., 2002AJ....123..485S 2002AJ....123..485S) and with a proprietary period that expired
before 2003 September.
For this paper, the source extraction is performed in the 2-8keV
merged PN plus MOS images (when available) using the EWAVELET task of
SAS with a detection threshold of 6σ.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 84 Optical and X-ray properties of the hard X-ray
selected sample
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See also:
http://www.sdss.org/ : SDSS Home Page
J/A+A/432/69 : Extremely Red Objects XMM-Newton observations (Brusa+, 2005)
J/MNRAS/349/135 : XMM-Newton/2dF survey. II. (Georgakakis+, 2004)
J/MNRAS/352/91 : XMM-Newton/2dF survey. IV. (Georgantopoulos+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [GGA2006] Sequential number
3 A1 --- n_[GGA2006] Note on [GGA2006] (1)
5- 6 I2 h RAh X-ray Right ascension (J2000)
8- 9 I2 min RAm X-ray Right ascension (J2000)
11- 15 F5.2 s RAs X-ray Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 28 F5.2 arcsec DEs Declination (J2000)
30- 34 F5.2 mag rmag r magnitude
36 A1 --- l_P Limit flag on P
37- 40 F4.2 % P Probability that the optical counterpart
is a chance coincidence
42- 46 F5.2 10-17W/m2 FX X-ray flux in the 2-8keV band
48- 51 F4.2 10-17W/m2 e_FX rms uncertainty on FX
53- 57 F5.2 --- logFX/Fopt X-ray-to-optical flux ratio
59- 63 F5.3 --- zsp ?=- Spetroscopic redshift
65- 66 A2 --- SpClass Spetroscopic classification (2)
68- 72 F5.3 --- zph ?=- Photometric redshift
74- 78 F5.2 --- logLX X-ray luminosity in the 2-8keV band,
corrected for X-ray absorption
80 A1 --- l_NH Limit flag on NH
81- 85 F5.2 10+22cm-2 NH ?=- Rest-frame hydrogen column density
87- 91 F5.2 10+22cm-2 E_NH ? Error on NH (upper limit)
93- 97 F5.2 10+22cm-2 e_NH ? Error on NH (lower limit)
99-102 F4.2 --- Gamma ?=- Power-law spectral index
104-107 F4.2 --- E_Gamma ? Error on Gamma (upper limit)
109-112 F4.2 --- e_Gamma ? Error on Gamma (lower limit)
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Note (1): Notes as follows:
a = Photometric redshift from the LX-log(FX-Fopt)
b = Source #72 is classified Galactic star by 2QZ. Inspection of the
optical spectrum however, suggests an early-type galaxy at z=0.243.
c = Source #84 has no spectral classification in NED
Note (2): Spectral class as follows:
AL = for absorption-line systems
NL = for narrow emission-line sources
BL = broad emission-line optical spectra
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Jun-2006