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Date and Time of the Query: 2019-06-15 T16:38:09 PDT
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For refcode 2010ApJ...716.1514Y:
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2010ApJ...716.1514Y The Dearth of Chemically Enriched Warm-Hot Circumgalactic Gas Yao, Y.; Wang, Q. D.; Penton, S. V.; Tripp, T. M.; Shull, J. M.; Stocke, J. T. Abstract. The circumgalactic medium (CGM) around galaxies is believed to record various forms of galaxy feedback and contain a significant portion of the "missing baryons" of individual dark matter halos. However, clear observational evidence for the existence of the hot CGM is still absent. We use intervening galaxies along 12 background active galactic nuclei (AGNs) as tracers to search for X-ray absorption lines produced in the corresponding CGM. Stacking Chandra grating observations with respect to galaxy groups and different luminosities of these intervening galaxies, we obtain spectra with signal-to-noise ratios of 46-72 per 20 m{Angstrom} spectral bin at the expected O VII K{alpha} line. We find no detectable absorption lines of C VI, N VII, O VII, O VIII, or Ne IX. The high spectral quality allows us to tightly constrain upper limits to the corresponding ionic column densities (in particular log [N_O VII_(cm^-2^)]<= 14.2-14.8). These nondetections are inconsistent with the Local Group hypothesis of the X-ray absorption lines at z ~= 0 commonly observed in the spectra of AGNs. These results indicate that the putative CGM in the temperature range of 10^5.5^-10^6.3^ K may not be able to account for the missing baryons unless the metallicity is less than 10% solar. Key words: cosmology: observations, intergalactic medium, quasars: absorption lines, X-rays: general
Retrieve 139 NED objects in this reference.
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