Faint object spectrograph observations of the large-redshift gravitational lens candidate 1208+1011

John N. Bahcall, George F. Hartig, Buell T. Jannuzi, Dan Maoz, Donald P. Schneider

Research output: Contribution to journalArticle

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Abstract

We report HST spectroscopic observations of the z = 3.8 gravitational lens candidate 1208+1011. Lowdispersion (R = 200) Faint Object Spectrograph data, covering the wavelength range 3700-7800 Å, were obtained for each of the two components (V ≈ 18.3 and 19.8 mag) and for a comparison (blank) field; the fainter component and the blank field are both separated by 0″.47 from the brighter image. The spectra of both components possess strong Lyα/N V and O VI/Lyβ emission lines at a redshift of 3.8 as well as a number of similar absorption features. Both components have a ratio of the equivalent widths of the O VI complex to the Lyα complex much larger than the typical value seen in large-redshift quasars. There are small differences in the measured profiles of the Lyα and O VI/Lyβ emission lines of the images. These differences could be caused by absorption along different paths to a single lensed object, by unequal imaging of extended emissions, by systematic measuring errors, or by intrinsic differences in two nearly identical neighboring quasars.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume400
Issue number2 PART 2
StatePublished - Dec 1 1992

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faint objects
gravitational lenses
spectrographs
blanks
quasars
wavelength
coverings
profiles
wavelengths

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bahcall, John N. ; Hartig, George F. ; Jannuzi, Buell T. ; Maoz, Dan ; Schneider, Donald P. / Faint object spectrograph observations of the large-redshift gravitational lens candidate 1208+1011. In: Astrophysical Journal. 1992 ; Vol. 400, No. 2 PART 2.
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abstract = "We report HST spectroscopic observations of the z = 3.8 gravitational lens candidate 1208+1011. Lowdispersion (R = 200) Faint Object Spectrograph data, covering the wavelength range 3700-7800 {\AA}, were obtained for each of the two components (V ≈ 18.3 and 19.8 mag) and for a comparison (blank) field; the fainter component and the blank field are both separated by 0″.47 from the brighter image. The spectra of both components possess strong Lyα/N V and O VI/Lyβ emission lines at a redshift of 3.8 as well as a number of similar absorption features. Both components have a ratio of the equivalent widths of the O VI complex to the Lyα complex much larger than the typical value seen in large-redshift quasars. There are small differences in the measured profiles of the Lyα and O VI/Lyβ emission lines of the images. These differences could be caused by absorption along different paths to a single lensed object, by unequal imaging of extended emissions, by systematic measuring errors, or by intrinsic differences in two nearly identical neighboring quasars.",
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Faint object spectrograph observations of the large-redshift gravitational lens candidate 1208+1011. / Bahcall, John N.; Hartig, George F.; Jannuzi, Buell T.; Maoz, Dan; Schneider, Donald P.

In: Astrophysical Journal, Vol. 400, No. 2 PART 2, 01.12.1992.

Research output: Contribution to journalArticle

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AU - Schneider, Donald P.

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