A galaxy overdensity at z=0.401 associated with an X-ray emitting structure of Warm-Hot Intergalactic Medium
arXiv:astro-ph/0703076 · doi:10.1051/0004-6361:20066591
Abstract
We present the results of spectroscopic observations of galaxies associated with the diffuse X-ray emitting structure discovered by Zappacosta et al. (2002). After measuring the redshifts of 161 galaxies, we confirm an overdensity of galaxies with projected dimensions of at least 2 Mpc, determine its spectroscopic redshift in z=0.401+/-0.002, and show that it is spatially coincident with the diffuse X-ray emission. This confirms the original claim that this X-ray emission has an extragalactic nature and is due to the Warm-Hot Intergalactic Medium (WHIM). We used this value of the redshift to compute the temperature of the emitting gas. The resulting value depends on the metallicity that is assumed for the IGM, and is constrained to be between 0.3 and 0.6 keV for metallicities between 0.05 and 0.3 solar, in good agreement with the expectations from the WHIM.
arXiv comment9 pages, A&A, in press, minor language changes
References in corpus (27)
- The Cosmic Baryon Budget
- Where are the Baryons?
- Baryons in the Warm-Hot Intergalactic Medium
- Lyman Alpha Imaging of a Proto-Cluster Region at <z>=3.09
- The Cosmic Energy Inventory
- A wide field Hubble Space Telescope study of the cluster CL0024+16 at z=0.4. I: morphological distributions to 5 Mpc radius
- Near-infrared template spectra of normal galaxies: k-corrections, galaxy models and stellar populations
- The CNOC2 Field Galaxy Luminosity Function I: A Description of Luminosity Function Evolution
- Evolution Since z=1 of the Morphology-density Relation of Galaxies
- On the Iron content in rich nearby Clusters of Galaxies
- Simulating the physical properties of dark matter and gas inside the cosmic web
- Tracing the Warm-Hot Intergalactic Medium at Low Redshift: X-ray Forest Observations Towards H1821+643
- Hydrodynamic Simulation of the Cosmological X-ray Background
- Shock-Heated Gas in the Large Scale Structure of the Universe
- Weak lensing study of dark matter filaments and application to the binary cluster A 222 and A 223
- Warm-hot intergalactic baryons revealed
- The KPNO/Deeprange Distant Cluster Survey: I. The Catalog & the Space Density of Intermediate Redshift Clusters
- Ultra-Low Iron Abundances in Distant Hot Gas in Galaxy Groups
- Properties of the diffuse X-ray background in a high-resolution hydrodynamical simulation
- On the Lack of a Soft X-Ray Excess from Clusters of Galaxies
- Warm-Hot Intergalactic Medium in the Sculptor Supercluster
- Tracing the Warm Hot Intergalactic Medium in the local Universe
- The thermal Sunyaev-Zel'dovich Signature of Baryons in the Local Universe
- X-Ray Emission from the Warm Hot Intergalactic Medium
- Galaxy morphology and evolution from SWAN Adaptive Optics imaging
- Warm-hot intergalactic medium contribution to baryonic matter
- Constraining the thermal history of the Warm-Hot Intergalactic Medium
Cited by in corpus (9)
- Metal-line emission from the warm-hot intergalactic medium: I. Soft X-rays
- Confirming the Detection of an Intergalactic X-ray Absorber Toward PKS 2155-304
- Studying the WHIM with Gamma Ray Bursts
- X-raying the Intergalactic OVI Absorbers
- Studying the Warm-Hot Intergalactic Medium in Emission
- Discovery of a large-scale galaxy filament near a candidate intergalactic X-ray absorption system
- Expected properties of the Two-Point Autocorrelation Function of the IGM
- LUCIFER@LBT view of star-forming galaxies in the cluster 7C 1756+6520 at z~1.4
- Soft X-ray excess of clusters: a thermal filament model, and the strong lensing of background galaxy groups