Assoc. Research Scientist
Center for Astrophysical Sciences
Johns Hopkins University
|Nicole L. Homeier|
|Galaxy Clusters in the Early Universe -- Observations of massive galaxy clusters can be used to test cosmological model predictions at times when evolution is rapid, i.e. a few Gyr after the Big Bang. I study relationships between galaxy star formation rates, structure, mass and environment. I am particularly interested in the evolution of cluster star formation rates rates with redshift, the connection between z=2-5 "protoclusters" dominated by starburst galaxies and z=1-1.4 clusters dominated by passive galaxies, and the emergence and enrichment of the ICM.
Disk Galaxy Evolution -- Disk galaxies appear to be undergoing significant evolution between z=1 and the present day, particularly in clusters. I investigate phenomena such as the nature of red cluster sequence star-forming spirals, the build-up of the S0 population between z=1 and z=0, environmental effects on morphology, gas supply, and star formation rates.
Massive Star Formation -- I use near-infrared photometry and spectroscopy to characterize the massive stellar populations in Galactic star-forming regions to understand the basics of how massive stars form, that is, do they form with accretion disks like low-mass stars? Other key questions in this field are when the massive stars form relative to low-mass stars, can they form singly (which is related to the first issue), and can we quantify the impact massive stars have on their host galaxies.
|Recent Publications ADS Publications|
|Imprints of Environment on Cluster and Field Late-type Galaxies at z~1
N.L. Homeier, M. Postman, F. Menanteau, J.P. Blakeslee, S. Mei, R. Demarco, H.C. Ford, G.D. Illingworth, A. Zirm
AJ in press, astro-ph/0509650.
The Transformation of Galaxies at Intermediate Redshift
N.L. Homeier, R. Demarco, P. Rosati, et al.
ApJ, 621, 651 (2005)
Massive Star Formation in the W49 Giant Molecular Cloud: Implications for the Formation of Massive Star Clusters
N.L. Homeier & J. Alves
A&A, 430, 481 (2005)
The Effect of Type Ibc Contamination in Cosmological SN Samples
ApJ, 620, 12 (2005)
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