The distribution of the absorption-line redshifts of quasars: clustering of matter around quasars.

Details The distribution of the absorption-line redshifts of quasars: clustering of matter around quasars. The distribution of the absorption-line redshifts of quasars: clustering of matter around quasars.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..317l&link_type=abstract

Astronomy and Astrophysics, v.304, p.317

Astronomy and Astrophysics

Astrophysics

1

Quasars: General, Absorption Lines, Galaxies: Redshifts, Large-Scale Structure Of The Universe

Scientific paper

We study the statistics of the distribution of normalized relative radial velocities β=v/c between the heavy-element lines and the emission lines in the spectrum of quasars. This distribution is flat for β>=0.025 but exhibits an asymmetrical peak for lower values of β, including negative values. We explain the flat distribution as due to intervening absorbers, probably galactic disks or halos, contributing to the mass density of the Universe by {OMEGA}_g,c_=~0.065(0.1Mpc/r_g_)^2^(m_g_/10^12^Msun_)h^-1^ where r_g_ is the radius m_g_ the mass of these systems. The peak at low values of β is interpreted as due to a dense virialized cluster of such objects with r_vir_=~1.5h^-1^Mpc (at a redshift of about 2.1) and M_vir_=~5.10^15^ h^-1^Msun_ surrounded by an accretion region with a turn-around radius r_ta_=~3.1Mpc (this is the radius where the expansion is zero) and an overall radius r_clu_=~10 h^-1^Mpc and an overall mass M(<=r_clu_)=~4x10^16^h^-1^Msun_. This mass is characteristic of the largest entities in the Universe. These objects are similar to the Great Attractor after the difference in cosmic time is taken into account. Their contribution to the mass density of the Universe corresponds to about 4.7{OMEGA}_g,c_ around radio-loud quasars and about {OMEGA}_g,c_ around other quasars

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