Abstract
view Abstract Citations (156) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Keck High Resolution Spectroscopy of PKS 0123+257: Intrinsic Absorption in a Radio-Loud Quasar Barlow, Thomas A. ; Sargent, W. L. W. Abstract We present results from Keck I high resolution spectroscopy of the radio-loud quasar PKS 0123+257 (Ζe=2.364, V=17.5). In this object we detect Lyα, N V λλ 1238, 1242, Si IV λλ 1393,1402, and C IV λλ 1548,1550 in an absorption system at a redshift of 2.369. The Lyα 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 ratio also clearly demonstrates that the absorbing clouds at this redshift do not fully occult the background light source along our line-of-sight. The absorption lines are positioned near the centers of the broad emission-lines and the coverage fraction of the strongest absorption lines varies inversely proportionally with the strength of the corresponding emission lines. This implies that although the absorption-line region may obscure the continuum source, it does not completely occult the broad emission-line region. This effect suggests that the lines are formed close to the QSO central region. A model is proposed in which the apparent coverage fraction derived for the weaker absorption lines may vary with the column density of the lines. Broad absorption-lines (which are known to be intrinsic) are found nearly exclusively in radio-quiet objects. Intrinsic narrow absorption lines have previously been found in radio-quiet QSOs; it is therefore significant that an intrinsic absorption system has been verified in a radio-loud quasar. Publication: The Astronomical Journal Pub Date: January 1997 DOI: 10.1086/118239 arXiv: arXiv:astro-ph/9611010 Bibcode: 1997AJ....113..136B Keywords: QUASARS: INDIVIDUAL: PKS 0123+257; QUASARS: ABSORPTION LINES; Astrophysics E-Print: 16 pages with 5 figures, AAS LaTex v4.0. To appear in the Astronomical Journal, January 1997 full text sources arXiv | ADS | data products SIMBAD (1) NED (1)
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