Variable ultraviolet absorption in the spectrum of MR 2251-178

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Abstract

We present an ultraviolet spectrum of MR 2251-178 taken with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) with the G230L grating. The observation is part of a snapshot program of quasars (QSOs) that systematically searches for intrinsic absorption lines through variability. The sample consists of all QSOs observed with the HST/Faint Object Spectrograph (FOS) that showed associated narrow absorption lines. The FOS spectrum of MR 2251-178, taken in 1996, showed an associated C IV doublet with a λ1548 equivalent width of 1.09 ±0.09 Å. It is not detected in the, STIS spectrum taken 4 years later, down to a 3 σ threshold of 0.19 Å. In addition to its other accolades, these observations make MR 2251-178 the very first QSO at low redshift in which the associated absorption is shown to be truly intrinsic. We discuss the implications of this and suggest courses for future study.

Original languageEnglish (US)
Pages (from-to)L7-L10
JournalAstrophysical Journal
Volume556
Issue number1 PART 2
DOIs
StatePublished - Jul 20 2001

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ultraviolet absorption
quasars
spectrographs
faint objects
Hubble Space Telescope
telescopes
ultraviolet spectra
gratings
thresholds

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "Variable ultraviolet absorption in the spectrum of MR 2251-178",
abstract = "We present an ultraviolet spectrum of MR 2251-178 taken with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) with the G230L grating. The observation is part of a snapshot program of quasars (QSOs) that systematically searches for intrinsic absorption lines through variability. The sample consists of all QSOs observed with the HST/Faint Object Spectrograph (FOS) that showed associated narrow absorption lines. The FOS spectrum of MR 2251-178, taken in 1996, showed an associated C IV doublet with a λ1548 equivalent width of 1.09 ±0.09 {\AA}. It is not detected in the, STIS spectrum taken 4 years later, down to a 3 σ threshold of 0.19 {\AA}. In addition to its other accolades, these observations make MR 2251-178 the very first QSO at low redshift in which the associated absorption is shown to be truly intrinsic. We discuss the implications of this and suggest courses for future study.",
author = "Rajib Ganguly and Charlton, {Jane C.} and Michael Eracleous",
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Variable ultraviolet absorption in the spectrum of MR 2251-178. / Ganguly, Rajib; Charlton, Jane C.; Eracleous, Michael.

In: Astrophysical Journal, Vol. 556, No. 1 PART 2, 20.07.2001, p. L7-L10.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Variable ultraviolet absorption in the spectrum of MR 2251-178

AU - Ganguly, Rajib

AU - Charlton, Jane C.

AU - Eracleous, Michael

PY - 2001/7/20

Y1 - 2001/7/20

N2 - We present an ultraviolet spectrum of MR 2251-178 taken with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) with the G230L grating. The observation is part of a snapshot program of quasars (QSOs) that systematically searches for intrinsic absorption lines through variability. The sample consists of all QSOs observed with the HST/Faint Object Spectrograph (FOS) that showed associated narrow absorption lines. The FOS spectrum of MR 2251-178, taken in 1996, showed an associated C IV doublet with a λ1548 equivalent width of 1.09 ±0.09 Å. It is not detected in the, STIS spectrum taken 4 years later, down to a 3 σ threshold of 0.19 Å. In addition to its other accolades, these observations make MR 2251-178 the very first QSO at low redshift in which the associated absorption is shown to be truly intrinsic. We discuss the implications of this and suggest courses for future study.

AB - We present an ultraviolet spectrum of MR 2251-178 taken with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) with the G230L grating. The observation is part of a snapshot program of quasars (QSOs) that systematically searches for intrinsic absorption lines through variability. The sample consists of all QSOs observed with the HST/Faint Object Spectrograph (FOS) that showed associated narrow absorption lines. The FOS spectrum of MR 2251-178, taken in 1996, showed an associated C IV doublet with a λ1548 equivalent width of 1.09 ±0.09 Å. It is not detected in the, STIS spectrum taken 4 years later, down to a 3 σ threshold of 0.19 Å. In addition to its other accolades, these observations make MR 2251-178 the very first QSO at low redshift in which the associated absorption is shown to be truly intrinsic. We discuss the implications of this and suggest courses for future study.

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