Observations of QSO J2233-606 in the Southern Hubble Deep Field

Sealey, K. M., Drinkwater, M. J. and Webb, J. K. (1998) Observations of QSO J2233-606 in the Southern Hubble Deep Field. Astrophysical Journal, 499 2: L135-L138. doi:10.1086/311370

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Author Sealey, K. M.
Drinkwater, M. J.
Webb, J. K.
Title Observations of QSO J2233-606 in the Southern Hubble Deep Field
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 1998
Sub-type Article (original research)
DOI 10.1086/311370
Open Access Status File (Publisher version)
Volume 499
Issue 2
Start page L135
End page L138
Total pages 4
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Abstract The Hubble Deep Field South (HDF-S) Hubble Space Telescope (HST) observations are expected to begin in 1998 October. We present a composite spectrum of the QSO in the HDF-S held covering UV/optical/near-IR wavelengths, obtained by combining data from the Australian National University 2.3 m telescope with STIS on the HST.(1) This intermediate-resolution spectrum covers the range 1600-10000 Angstrom and allows us to derive some basic information on the intervening absorption systems which will be important in planning future higher resolution studies of this QSO. The QSO J2233 - 606 coordinates are alpha = 22(h)33(m)37(s).6, delta = -60 degrees 33'29 (J2000), the magnitude is B = 17.5, and its redshift is z(em) = 2.238, derived by simultaneously fitting several emission lines. The spectral index is alpha = -0.7 +/- 0.1, measured between the Ly alpha and Mg II emission lines. Many absorption systems are present, including systems with metal lines redward of the Ly alpha emission line at z(abs) 2.204, 1.942, 1.870, 1.787 and a few very strong Ly alpha features at z(abs) = 2.077, 1.928, without similarly strong metal lines. There is a conspicuous Lyman limit (LL) absorption system that is most likely associated with the z(abs) = 1.942 system with a neutral hydrogen column density of N-HI = (3.1 +/- 1.0) x 10(17) cm(-2). There is some evidence for the presence of a second LL absorber just to the blue of the conspicuous system at z = 1.870. We have employed a new technique, based on an analysis of the shape of the observed spectrum in the region of the LL absorption, to explore the properties of the gas. We tentatively conclude that this system might have suitable characteristics for measuring the deuterium-to-hydrogen (D/H) ratio.
Keyword Astronomy & Astrophysics
Quasars, Absorption Lines
Quasars, Emission Lines
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 13 Aug 2007, 10:30:10 EST