Journal
ASTRONOMY & ASTROPHYSICS
Volume 572, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201423961
Keywords
quasars: absorption lines; intergalactic medium; large-scale structure of Universe
Categories
Ask authors/readers for more resources
Simulations predict that gas in the intergalactic medium (IGM) is distributed in filamentary structures that connect dense galaxy clusters and form the cosmic web. These structures of predominantly ionized hydrogen are difficult to observe directly due to their lack of emitting regions. We serendipitously detected an overdensity of log N(HI) > 18.0 absorbers at z similar or equal to 2.69 along the lines of sight toward a pair of background quasars. Three main absorption regions spanning similar to 2000 km s(-1) (corresponding to 6.4 h(70)(-1) Mpc proper) are coincident in the two lines of sight, which are separated by similar to 90 h(70)(-1) kpc transverse proper distance. Two regions have [Fe/H] < -1.9 and correspond to mild overdensities in the IGM gas. The third region is a sub-DLA with [Fe/H] = -1.1 that is probably associated with a galaxy. We discuss the possibility that the lines of sight probe along the length of a filament or intercept a galaxy protocluster.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available