Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560215r&link_type=abstract
American Astronomical Society, AAS Meeting #215, #602.15; Bulletin of the American Astronomical Society, Vol. 36, p.1123
Astronomy and Astrophysics
Astronomy
Scientific paper
We determine the stellar mass of star forming galaxies in the X-ray luminous cluster MS 0451.6-0305 at z=0.54. The stellar mass is estimated from fitting model Spectral Energy Distributions (SEDs) to deep, optical UBRIz observations obtained from WIYN 3.5m telescope and public NIR K-band image from Palomar Observatory telescope. The model SEDs are based on the stellar population models of Bruzual and Charlot (2003) and cover a wide range of star formation histories, IMFs, metallicities, and ages. The derived stellar masses are compared to the dynamical masses for a set of 25 star forming galaxies. The dynamical masses are derived from moderate resolution, spectroscopic observations of emission lines from the DEIMOS spectrograph on the Keck telescope. We measure stellar masses for galaxies down to M*=3x108 Msun. A strong correlation is seen between the dynamical and stellar mass for the galaxies; and the star forming galaxies show fairly constant ratio between stellar and dynamical mass. For massive objects, the cluster galaxies exhibit very similar behavior to objects in the field at the same redshift, but our sample extends to low mass regimes that have not previously been probed at these redshifts. Future work will concentrate on including different stellar population models, extinction laws, and composite stellar populations.
Bershady Matthew
Crawford Steven
Randriamampandry Solohery M.
Wirth Georg
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