Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.0504b&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #05.04; Bulletin of the American Astronomical Society, Vol. 28, p.827
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from Keck I service observations of the radio loud quasar PKS 0123+2543 (z_e=2.358, V=17.5). We selected this object in order to study intrinsic QSO absorption line systems, since it had been reported to have an absorption system with z_a > z_e. It has been demonstrated previously (Barlow 1995, BAAS 27, 872) that high resolution ( ~ 6 km/s FWHM) spectra of QSO absorption lines can be used to help distinguish narrow intrinsic and intervening systems. In this object, we detect Lyalpha , N V lambda lambda 1238,1242, Si IV lambda lambda 1393,1402, and C IV lambda lambda 1548,1550 in an absorption system at z_a=2.369. The Lyalpha line has a square-bottomed profile suggesting a high column density of gas, yet the line does not reach zero intensity. The resolved C IV doublet clearly demonstrates that the absorbing clouds do not cover the background light source since the calculated optical depth assuming complete coverage is not 2:1. The absorption lines are positioned near the center of the broad emission-lines and the coverage factor of the different ions varies with the strength of the broad emission lines. This implies that although the absorption region may obscure the continuum source, it does not completely cover the broad emission-line region. This effect suggests that the lines are close to the QSO central region (intrinsic to the QSO). Broad absorption-lines (which are known to be intrinsic) are found nearly exclusively in radio-quiet objects. Although intrinsic narrow absorption lines have previously been found in radio quiet QSOs (Hamann et al. 1995, ApJ 443, 606), it is significant that an intrinsic absorption system has been found in a radio loud quasar.
Barlow Thomas A.
Sargent Wallace L. W.
No associations
LandOfFree
Keck HIRES Spectra of PKS 0123+2543: Intrinsic Absorption in a Radio Loud Quasar does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Keck HIRES Spectra of PKS 0123+2543: Intrinsic Absorption in a Radio Loud Quasar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Keck HIRES Spectra of PKS 0123+2543: Intrinsic Absorption in a Radio Loud Quasar will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1351788