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Roncarelli, M; Moscardini, L; Tozzi, P; Borgani, S; Cheng, LM; Diaferio, A; Dolag, K; Murante, G; Roncarelli, M , Univ Bologna, Dipartimento Astron, Via Ranzani 1, I-40127 Bologna, Italy
Properties of the diffuse X-ray background in a high-resolution hydrodynamical simulation
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
KeywordSunyaev-zeldovich Effect(s) Deep Field-south Intracluster Medium Galaxy Clusters Xmm-newton Surface Brightness Chandra Evolution Baryons Entropy
AbstractWe study the properties of the diffuse X-ray background by using the results of a cosmological hydrodynamical simulation of the concordance Lambda cold dark matter (Lambda CDM) model. The simulation follows gravitational and gas dynamics and includes a treatment of physical processes, such as radiative cooling, star formation and supernova feedback. From the simulation outputs, we produce a set of two-dimensional maps of the intergalactic medium X-ray emission integrated over redshift. We find that the signal in the soft (0.5-2 keV) band is lognormally distributed with a mean intensity of about 4 x 10(-12) erg s(-1) cm(-2) deg(-2); approximately 40 per cent of the emission originates from warm-hot gas ( defined as baryons with 10(5) < T < 10(7) K), and 90 per cent comes from structures at z < 0.9. Since the spectrum is soft, being mostly provided by the intergalactic medium at low temperature, the total mean intensity in the hard (2-10 keV) X-ray band is smaller by a factor of about 4. In order to constrain the physical processes included in our simulation, we compare our results with the observed upper limit (1.2 +/- 0.3) x 10(-12) erg s(-1) cm(-2) deg(-2) of the soft X-ray emission due to diffuse gas. To this purpose, we remove the contributions of observable extended objects ( groups and clusters of galaxies) from the simulated maps by adopting different detectability criteria which are calibrated on the properties of systems at intermediate redshifts observed by Chandra. We show that the simulated diffuse soft X-ray emission is consistent with the present observed upper limit. However, if future measurements will decrease the level of the unresolved X-ray background by a factor of 2, a more efficient feedback mechanism should be required to suppress the soft emission of the gas residing within filaments and group-size haloes.
2006
ISSN0035-8711
Volume368Issue:1Pages:74-84
Subject AreaPhysics
Indexed BySCI
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Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5996
CollectionSCI期刊论文
Corresponding AuthorRoncarelli, M , Univ Bologna, Dipartimento Astron, Via Ranzani 1, I-40127 Bologna, Italy
Recommended Citation
GB/T 7714
Roncarelli, M,Moscardini, L,Tozzi, P,et al. Properties of the diffuse X-ray background in a high-resolution hydrodynamical simulation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,368(1):74-84.
APA Roncarelli, M.,Moscardini, L.,Tozzi, P.,Borgani, S.,Cheng, LM.,...&Roncarelli, M , Univ Bologna, Dipartimento Astron, Via Ranzani 1, I-40127 Bologna, Italy.(2006).Properties of the diffuse X-ray background in a high-resolution hydrodynamical simulation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,368(1),74-84.
MLA Roncarelli, M,et al."Properties of the diffuse X-ray background in a high-resolution hydrodynamical simulation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 368.1(2006):74-84.
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