Magellan/M2FS Spectroscopy of Galaxy Clusters: Stellar Population Model and Application to Abell 267
Walker, Matthew G.
Olszewski, Edward W.
Bailey, John I.
Crane, J. D.
Shectman, Stephen A.
AffiliationUniv Arizona, Steward Observ
Keywordsgalaxies: clusters: individual (Abell 267)
techniques: imaging spectroscopy
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationMagellan/M2FS Spectroscopy of Galaxy Clusters: Stellar Population Model and Application to Abell 267 2017, 154 (3):113 The Astronomical Journal
JournalThe Astronomical Journal
Rights© 2017. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractWe report the results of a pilot program to use the Magellan/M2FS spectrograph to survey the galactic populations and internal kinematics of galaxy clusters. For this initial study, we present spectroscopic measurements for 223 quiescent galaxies observed along the line of sight of the galaxy cluster Abell 267 (z similar to 0.23). We develop a Bayesian method for modeling the integrated light from each galaxy as a simple stellar population, with free parameters that specify the redshift (v(los)/c) and characteristic age, metallicity ([Fe/H]), alpha-abundance ([alpha/Fe]), and internal velocity dispersion (sigma(int)) for individual galaxies. Parameter estimates derived from our 1.5 hr observation of A267 have median random errors of sigma(vlos) = 20 km s(-1), sigma(Age) = 1.2 Gyr, sigma([Fe/H]) = 0.11 dex, sigma([alpha/Fe]) = 0.07 dex, and sigma(sigma int) = 20 km s(-1). In a companion paper, we use these results to model the structure and internal kinematics of A267.
VersionFinal published version
SponsorsNational Science Foundation [AST-1313045, AST-1412999]; NSF [AST-1312997, AST-1313006]