2015A&A...575A..43C


Query : 2015A&A...575A..43C

2015A&A...575A..43C - Astronomy and Astrophysics, volume 575A, 43-43 (2015/3-1)

Missing cosmic metals revealed by X-ray absorption towards distant sources.

CAMPANA S., SALVATERRA R., FERRARA A. and PALLOTTINI A.

Abstract (from CDS):

The census of heavy elements (metals) produced by all stars through cosmic times up to present-day is limited to ≲50%; of these only half are still found within their parent galaxy. The majority of metals is expelled from galaxies into the circumgalactic (or even more distant, intergalactic) space by powerful galactic winds, leaving unpleasant uncertainty on the amount, thermal properties and distribution of these key chemical species. These dispersed metals unavoidably absorb soft X-ray photons from distant sources. We show that their integrated contribution can be detected in the form of increasing X-ray absorption with distance, for all kinds of high-energy cosmic sources. Based on extensive cosmological simulations, we assess that ∼10% of all cosmic metals reside in the intergalactic medium. Most of the X-ray absorption arises instead from a few discrete structures along the line of sight. These extended structures, possibly pin-pointing galaxy groups, contain million degree, metal-enriched gas, 100-1000 times denser than the cosmic mean. An additional ∼10% of cosmic metals could reside in this phase.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - galaxies: active - galaxies: halos - intergalactic medium - X-rays: general

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 2E 1852 Sy1 07 43 12.5393029560 +74 29 36.758906988     17.53     ~ 27 0
2 QSO B0909+5312 QSO 09 13 01.031 +52 59 28.90   17.29 16.71     ~ 149 1
3 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 838 0
4 [VV98] J105239.6+572432 QSO 10 52 39.5958253296 +57 24 31.425574788   18.39 18.07     ~ 76 0
5 [VV98] J105316.9+573552 QSO 10 53 16.7644541304 +57 35 50.730680004   19.97 19.47     ~ 67 0
6 2MASS J11594101-1959247 Sy1 11 59 41.0142906912 -19 59 24.583599996   16.2 16.2     ~ 32 0
7 4C 58.27 QSO 13 47 40.9925176320 +58 12 42.072773868   18.91 18.84     ~ 67 1

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