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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 39 103 Catalogue of objects
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Aug-2006