J/A+A/484/303 X-ray sources close to 3C 295 galaxy cluster (D'Elia+, 2008)
The candidate filament close to the 3C 295 galaxy cluster:
optical and X-ray spectroscopy.
D'Elia V., Fiore F., Mathur S., Cocchia F.
<Astron. Astrophys., 484, 303-309 (2008)>
=2008A&A...484..303D 2008A&A...484..303D
ADC_Keywords: Clusters, galaxy ; X-ray sources
Keywords: X-rays: galaxies - galaxies: clusters: individual: 3C 295 -
X-rays: diffuse background -
cosmology: large-scale structure of Universe
Abstract:
We present a detailed analysis of the overdensity of X-ray sources
close to the 3C 295 galaxy cluster (z=0.46) to assess whether it is
associated with a filament of the large-scale structure of the
Universe. We obtained optical spectra of the optical counterparts of
eleven sources associated with the filament, finding that one is at
z=0.474. This is a type 1 AGN at 1.5' from the cluster center.
We found three more sources with a redshift in the range 0.37/0.53. We
extracted the stacked X-ray spectrum of 47 X-ray sources belonging to
the putative filament.
Description:
To acquire the optical spectra of the 3C 295 sources, we proposed a
Multi Object Spectroscopy (MOS) programme using DOLORES@TNG (AOT 9).
Two acquisition images each of exposure time 900 s and with a limiting
magnitude of R∼24, had already been obtained using DOLORES on March
19, 2002.
We acquired the spectral data on 22 and 23 March, 2004.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 71 Optical identification of the x-ray sources in
the 3C 295 field
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [DFM2008] Sequential number
5- 6 I2 h RAh X-ray right ascension (J2000)
8- 9 I2 min RAm X-ray right ascension (J2000)
11- 16 F6.3 s RAs X-ray right ascension (J2000)
18 A1 --- DE- X-ray declination sign (J2000)
19- 20 I2 deg DEd X-ray declination (J2000)
22- 23 I2 arcmin DEm X-ray declination (J2000)
25- 29 F5.2 arcsec DEs X-ray declination (J2000)
31- 32 I2 h RA1h Optical right ascension (J2000)
34- 35 I2 min RA1m Optical right ascension (J2000)
37- 41 F5.2 s RA1s Optical right ascension (J2000)
43 A1 --- DE1- Optical declination sign (J2000)
44- 45 I2 deg DE1d Optical declination (J2000)
47- 48 I2 arcmin DE1m Optical declination (J2000)
50- 54 F5.2 arcsec DE1s Optical declination (J2000)
55 A1 --- u_DE1s Uncertainty flag on position
57- 61 F5.2 mag Rcmag Cousins R magnitude
64- 71 E8.3 mW/m2 FX X-ray flux in the (0.5-10keV) band
73 I1 --- Chip Chip number
75 A1 --- Flg [y/n] Stacked X-ray spectrum ?
77- 81 F5.3 --- z ?=- Redshift
83- 90 E8.3 10-7W LX ?=- X-ray luminosity
92- 95 A4 --- Class Class of object
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Sep-2008