2dF-SDSS LRG and QSO (2SLAQ) survey: Evolution of the most massive galaxies

Nichol R.C., Cannon R., Roseboom I. and Wake D. (2007). 2dF-SDSS LRG and QSO (2SLAQ) survey: Evolution of the most massive galaxies. In: , , (422-426). . doi:10.1007/978-3-540-73484-0_78

Author Nichol R.C.
Cannon R.
Roseboom I.
Wake D.
Title of paper 2dF-SDSS LRG and QSO (2SLAQ) survey: Evolution of the most massive galaxies
Publication Year 2007
Sub-type Fully published paper
DOI 10.1007/978-3-540-73484-0_78
Open Access Status
ISBN 354073483X
ISSN 1431-2433
Volume 2007
Start page 422
End page 426
Total pages 5
Abstract/Summary The 2dF-SDSS LRG and QSO (2SLAQ) survey is a new survey of distant Luminous Red Galaxies (LRGs) and faint quasars selected from the Sloan Digital Sky Survey (SDSS) multi-color photometric data and spectroscopically observed using the 2dF instrument on the Anglo-Australian Telescope (AAT). In total, the 2SLAQ survey has measured over 11000 LRG redshifts, covering 180deg2 of SDSS imaging data, from 87 allocated nights of AAT time. Over 90% of these galaxies are within the range 0.45 < z < 0.7 and have luminosities consistent with ≥ 3L*. When combined with the lower redshift SDSS LRGs, the evolution in the luminosity function of these LRGs is fully consistent with that expected from a simple passive (luminosity) evolution model. This observation suggests that at least half of the LRGs seen at z ≃ 0.2 must already have more than half their stellar mass in place by z ≃ 0.6, i.e., our observations are inconsistent with a majority of LRGs experiencing a major merger in the last 6 Gyrs. However, some "frosting" (i.e., minor mergers) has taken place with ∼5% of LRGs showing some evidence of recent and/or on-going star-formation, but it only contributes ∼1% of their stellar mass.
Subjects 3101 Physics and Astronomy (miscellaneous)
3103 Astronomy and Astrophysics
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
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