Query : 2004A&A...423..943T

2004A&A...423..943T - Astronomy and Astrophysics, volume 423, 943-954 (2004/9-1)

High-resolution spectroscopy of flat-spectrum quasars. I. Redshifted emission and absorption in PKS 2145+067.


Abstract (from CDS):

We report Very Large Telescope (VLT) observations of the quasar PKS 2145+067. We obtained high-resolution (R≃100000 or 3km/s) optical spectra with the UV-Visual Echelle Spectrograph (UVES) at the VLT UT2 telescope. The emission redshift measured from [OIII] is zem=1.0003. In our spectra, the well-known intervening metal-rich absorption system at zabs=0.79089 shows MgII absorption lines resolved into 15 velocity components with a total spread of about 206km/s. This absorption is consistent with a line of sight passing through the extended gaseous halo of a disk galaxy. The derived Doppler line broadening parameters are in the range b=2 to 5km/s. We also detected absorption lines of MgI, FeII, and CaII in the same system. The ionization state of the absorbing gas is analyzed and compared with previous studies of PKS 2145+067. Finally, we discuss the implications of high-resolution data for proposed cosmological variations of the fine-structure constant.

Abstract Copyright:

Journal keyword(s): galaxies: quasars: absorption lines - galaxies: quasars: emission lines - galaxies: quasars: individual: PKS 2145+067

Errata: erratum vol. 440, p. 59 (2005)

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 QSO B1634+7037 QSO 16 34 28.9917184368 +70 31 32.393436960   14.90 14.66     ~ 267 0
2 HD 312980 * 18 14 03.2262624384 -20 18 07.355351664 10.17 10.50 9.68 9.69   B0 38 0
3 4C 06.69 QSO 21 48 05.45866779 +06 57 38.6041877   16.85 16.47 15.06   ~ 653 1

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