2004A&A...420..889M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET02:03:06

2004A&A...420..889M - Astronomy and Astrophysics, volume 420, 889-897 (2004/6-4)

Extreme gas properties in the most distant quasars.

MAIOLINO R., OLIVA E., GHINASSI F., PEDANI M., MANNUCCI F., MUJICA R. and JUAREZ Y.

Abstract (from CDS):

We present near-IR, low resolution spectra of eight of the most distant quasars known, with redshifts in the range 4.9<z<6.4. Half of these quasars are characterized by deep, broad and blueshifted absorption features associated with both high and low ionization species (CIV, SiIV, AlIII, MgII), i.e. they belong to the class of Broad Absorption Line (BAL) quasars, which are associated with powerful outflows of dense gas. Although the sample is small, the large fraction of BAL quasars, the depth and ionization state of the absorption features suggest that these most distant quasars are surrounded by a much larger amount of dense gas than lower redshift (z<4) quasars. The possible interpretation in terms of extremely high accretion rates and the association with the early formation of quasars and of their host galaxies is discussed. The absorption properties of the dust, associated with the gas along the line of sight, appear different with respect to lower redshift quasars, possibly indicating different dust physics at these highest redshifts.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: high-redshift - galaxies: quasars: absorption lines - galaxies: quasars: general

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO J0756+4104 QSO 07 56 18.139 +41 04 08.61   25.29 23.32     ~ 46 0
2 SDSS J103027.09+052455.0 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 230 0
3 SDSS J104433.04-012502.0 QSO 10 44 33.044 -01 25 02.07     21.81     ~ 155 1
4 SDSS J104845.05+463718.3 QSO 10 48 45.058 +46 37 18.38   25.87 24.76     ~ 117 0
5 SDSS J114816.64+525150.3 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 404 0
6 SDSS J130608.25+035626.3 QSO 13 06 08.258 +03 56 26.33   25.59 24.81     ~ 131 0
7 QSO J1605-0112 QSO 16 05 01.2139885707 -01 12 20.698849701   26.55 24.30     ~ 37 0
8 QSO J1737+5828 QSO 17 37 44.8801064223 +58 28 29.612406771   25.47 22.95     ~ 46 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-02:03:06

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