TY - JOUR
T1 - Faint object spectrograph observations of the large-redshift gravitational lens candidate 1208+1011
AU - Bahcall, John N.
AU - Hartig, George F.
AU - Jannuzi, Buell T.
AU - Maoz, Dan
AU - Schneider, Donald P.
PY - 1992/12/1
Y1 - 1992/12/1
N2 - 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.
AB - 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.
KW - Gravitational lensing
KW - Quasars: emission lines
UR - http://www.scopus.com/inward/record.url?scp=11944273874&partnerID=8YFLogxK
U2 - 10.1086/186647
DO - 10.1086/186647
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AN - SCOPUS:11944273874
SN - 0004-637X
VL - 400
SP - L51-L54
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART 2
ER -