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J/A+A/434/801       X-ray sources near Lockman Hole          (Zappacosta+, 2005)

Constraining the thermal history of the warm-hot intergalactic medium. Zappacosta L., Maiolino R., Finoguenov A., Mannucci F., Gilli R., Ferrara A. <Astron. Astrophys., 434, 801-809 (2005)> =2005A&A...434..801Z
ADC_Keywords: X-ray sources ; Redshifts Keywords: cosmology: large-scale structure of Universe - X-rays: diffuse background - galaxies: intergalactic medium - galaxies: distances and redshifts Abstract: We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we have investigated the soft X-ray emission from the Warm-Hot Intergalactic Medium (WHIM) expected to be associated with this large-scale structure and we set a tight upper limit to its flux in the very soft 0.2-0.4keV band. The non-detection requires the WHIM at these redshifts to be cooler than 0.1keV. Combined with the WHIM emission detections at lower redshift, our result indicates that the WHIM temperature rapidly decreases with redshift, as expected in popular cosmological models. Description: An analysis of the redshift distribution of the sources previously identified in the Lockman Hole (most of which are optical counterparts of X-ray sources detected by ROSAT and XMM) has revealed the existence of 8 sources in the narrow redshift range 0.780-0.807 (∼74∼Mpc). These sources are located within a region of about 20-arcmin. In the same region we have found another object with a photometrically estimated redshift of 0.8±0.1 To confirm this we have obtained multi-object spectroscopy of 215 galaxies in the same area. We used the multi-object spectroscopic mode (MOS) of the optical spectrometer DOLORES, at the Telescopio Nazionale Galileo (TNG), with the LR-R grating, which covers the 4470-10360Å range at a resolution of 11Å. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 39 103 Catalogue of objects
Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [ZMF2005] Sequential number 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 15 F5.2 s RAs 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 F5.3 --- z Redshift 36- 39 A4 --- q_z Redshift quality
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Aug-2006
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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