TY - JOUR
T1 - High spatial resolution spectroscopy of the Lyα absorption towards the gravitational lens system B1422+2309
AU - Bechtold, Jill
AU - Yee, H. K.C.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1995/11
Y1 - 1995/11
N2 - We have obtained spectroscopy of individual components of the gravitational lensed quasar B1422+2309 using the Subarcsecond Imaging Spectrograph at the Canada-France-Hawan Telescope. The quasar has a redshift of 3.62, with four lensed images within a diameter of 1.3″. Components B and C have nearly identical spectra, confirming that they are the gravitationally lensed images of a single quasar. Numerous absorption lines, most of which are attributable to Lyα, are seen in both spectra. All lines detected are seen in the spectra of both components, implying that the Lyα forest clouds are larger than 0-0.15h100-1 kpc at z≈3.5. The equivalent widths of common lines are highly correlated, but the differences in the equivalent widths are larger than what is expected from the statistical errors in the individual lines. The scatter in the differences in equivalent widths can be accounted for if the column densities between the two lines of sight differ on average by approximately a factor of 1.5. This suggests that there are small-scale inhomogeneities in the gas density of the structures causing Lyα forest absorption.
AB - We have obtained spectroscopy of individual components of the gravitational lensed quasar B1422+2309 using the Subarcsecond Imaging Spectrograph at the Canada-France-Hawan Telescope. The quasar has a redshift of 3.62, with four lensed images within a diameter of 1.3″. Components B and C have nearly identical spectra, confirming that they are the gravitationally lensed images of a single quasar. Numerous absorption lines, most of which are attributable to Lyα, are seen in both spectra. All lines detected are seen in the spectra of both components, implying that the Lyα forest clouds are larger than 0-0.15h100-1 kpc at z≈3.5. The equivalent widths of common lines are highly correlated, but the differences in the equivalent widths are larger than what is expected from the statistical errors in the individual lines. The scatter in the differences in equivalent widths can be accounted for if the column densities between the two lines of sight differ on average by approximately a factor of 1.5. This suggests that there are small-scale inhomogeneities in the gas density of the structures causing Lyα forest absorption.
UR - http://www.scopus.com/inward/record.url?scp=0040694736&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0040694736&partnerID=8YFLogxK
U2 - 10.1086/117664
DO - 10.1086/117664
M3 - Article
AN - SCOPUS:0040694736
VL - 110
SP - 1984
EP - 1992
JO - Astronomical Journal
JF - Astronomical Journal
SN - 0004-6256
IS - 5
ER -