Query : 2014A&A...572A..31F

2014A&A...572A..31F - Astronomy and Astrophysics, volume 572A, 31-31 (2014/12-1)

A ∼6 Mpc overdensity at z ≃ 2.7 detected along a pair of quasar sight lines: filament or protocluster?


Abstract (from CDS):

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≃2.69 along the lines of sight toward a pair of background quasars. Three main absorption regions spanning ∼2000km/s (corresponding to 6.4h70–1Mpc proper) are coincident in the two lines of sight, which are separated by ∼90h70–1kpc 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.

Abstract Copyright:

Journal keyword(s): quasars: absorption lines - intergalactic medium - large-scale structure of Universe

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 SDSS J091338.30-010708.7 QSO 09 13 38.3097033312 -01 07 08.713815096           ~ 16 0
2 SDSS J091338.96-010704.6 QSO 09 13 38.9752265184 -01 07 04.654345728           ~ 17 0

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