Subaru high-resolution spectroscopy of complex metal absorption lines of the quasar HS 1603+3820

Toru Misawa, Toru Yamada, Masahide Takada-Hidai, Yiping Wang, Nobunari Kashikawa, Masanori Iye, Ichi Tanaka

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13 Citations (Scopus)


We present a high-resolution spectrum of the quasar HS 1603+3820 (z em = 2.542), observed with the High Dispersion Spectrograph on the Subaru Telescope. This quasar, first discovered in the Hamburg/CfA Quasar Survey, has 11 C IV lines at 1.96 < Zabs < 2.55. Our spectrum covers eight of the 11 C IV lines at zabs > 2.29 and resolves some of them into multiple narrow components with b < 25 km s-1 because of the high spectral resolution R = 45,000, while other lines show broad profiles (b > 65 km s-1). We use three properties of C IV lines, specifically, time variability, covering factor, and absorption-line profile, to classify them into quasar intrinsic absorption lines (QIALs) and spatially intervening absorption lines (SIALs). The C IV lines at 2.42 < Zabs < 2.45 are classified as QIALs in spite of their large velocity shifts from the quasar. Perhaps they are produced by gas clouds ejected from the quasar with velocity vej = 8000-10,000 km s -1. On the other hand, three C IV lines at 2.48 < zabs < 2.55 are classified as SIALs, which suggests there exist intervening absorbers near the quasar. We, however, cannot rule out QIALs for the two lines at zabs ∼ 2.54 and 2.55, because their velocity shifts, 430 km s-1 blueward and 950 km s-1 redward of the quasar, are very small. The C IV line at zabs ∼ 2.48 consists of many narrow components and also has corresponding low-ionization metal lines (Al II, Si II, and Fe II). The velocity distribution of these low-ionization ions is concentrated at the center of the system compared with that of the high-ionization C IV ion. Therefore we ascribe this system of absorption lines to an intervening galaxy.

Original languageEnglish
Pages (from-to)1336-1344
Number of pages9
JournalAstronomical Journal
Issue number3 1767
Publication statusPublished - 2003 Mar
Externally publishedYes


  • Quasars: absorption lines
  • Quasars: individual (HS 1603+3820)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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