TY - JOUR
T1 - Multi-object spectroscopy of the field surrounding PKS 2126-158
T2 - Discovery of a z = 0.66 galaxy group
AU - Whiting, Matthew T.
AU - Webster, Rachel L.
AU - Francis, Paul J.
PY - 2006/5
Y1 - 2006/5
N2 - The high-redshift radio-loud quasar PKS 2126-158 is found to have a large number of red galaxies in close apparent proximity. We use the Gemini Multi-Object Spectrograph (GMOS) on Gemini South to obtain optical spectra for a large fraction of these sources. We show that there is a group of galaxies at z ∼ 0.66, coincident with a metal-line absorption system seen in the quasar's optical spectrum. The multiplexing capabilities of GMOS also allow us to measure redshifts of many foreground galaxies in the field surrounding the quasar. The galaxy group has five confirmed members, and a further four fainter galaxies are possibly associated. All confirmed members exhibit early-type galaxy spectra, a rare situation for a Mg II absorbing system. We discuss the relationship of this group to the absorbing gas, and the possibility of gravitational lensing of the quasar due to the intervening galaxies.
AB - The high-redshift radio-loud quasar PKS 2126-158 is found to have a large number of red galaxies in close apparent proximity. We use the Gemini Multi-Object Spectrograph (GMOS) on Gemini South to obtain optical spectra for a large fraction of these sources. We show that there is a group of galaxies at z ∼ 0.66, coincident with a metal-line absorption system seen in the quasar's optical spectrum. The multiplexing capabilities of GMOS also allow us to measure redshifts of many foreground galaxies in the field surrounding the quasar. The galaxy group has five confirmed members, and a further four fainter galaxies are possibly associated. All confirmed members exhibit early-type galaxy spectra, a rare situation for a Mg II absorbing system. We discuss the relationship of this group to the absorbing gas, and the possibility of gravitational lensing of the quasar due to the intervening galaxies.
KW - Galaxies: general
KW - Gravitational lensing
KW - Quasars: absorption lines
KW - Quasars: individual: PKS 2126-158
UR - http://www.scopus.com/inward/record.url?scp=33645829272&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2006.10101.x
DO - 10.1111/j.1365-2966.2006.10101.x
M3 - Article
SN - 0035-8711
VL - 368
SP - 341
EP - 350
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -