Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 95 71 Optical identification of the x-ray sources in the 3C 295 field
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Sep-2008
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

catalogue service