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Full-Text Articles in Physical Sciences and Mathematics
A Wfc3 Study Of Globular Clusters In Ngc 4150 - An Early-Type Minor Merger, Sugata Kaviraj, R. Mark Crockett, Bradley C. Whitmore, Joseph Silk, Robert W. O'Connell, Rogier A. Windhorst, Max Mutchler, Marina Rejkuba, Sukyoung Yi, Jay A. Frogel, Daniela Calzetti
A Wfc3 Study Of Globular Clusters In Ngc 4150 - An Early-Type Minor Merger, Sugata Kaviraj, R. Mark Crockett, Bradley C. Whitmore, Joseph Silk, Robert W. O'Connell, Rogier A. Windhorst, Max Mutchler, Marina Rejkuba, Sukyoung Yi, Jay A. Frogel, Daniela Calzetti
Daniela Calzetti
We combine near-ultraviolet (NUV; 2250 {\AA}) and optical (U, B, V, I) imaging from the Wide Field Camera 3 (WFC3), on board the Hubble Space Telescope (HST), to study the globular cluster (GC) population in NGC 4150, a sub-L* (M_B ~ -18.48 mag) early-type minor-merger remnant in the Coma I cloud. We use broadband NUV-optical photometry from the WFC3 to estimate individual ages, metallicities, masses and line-of-sight extinctions [E_(B-V)] for 63 bright (M_V < -5 mag) GCs in this galaxy. In addition to a small GC population with ages greater than 10 Gyr, we find a dominant population of clusters with ages centred around 6 Gyr, consistent with the expected peak of stellar mass assembly in faint early-types residing in low-density environments. The old and intermediate-age GCs in NGC 4150 are metal-poor, with metallicities less than 0.1 ZSun, and reside in regions of low extinction (E_(B-V) < 0.05 mag). We also find a population of young, metal-rich (Z > 0.3 ZSun) clusters that have formed within the last Gyr and reside in relatively dusty (E_(B-V) > 0.3 mag) regions that are coincident with the part of the …
What Turns Galaxies Off? The Different Morphologies Of Star-Forming And Quiescent Galaxies Since Z~2 From Candels, Eric F. Bell, Arjen Van Der Wel, Casey Papovich, Dale Kocevski, Jennifer Lotz, Daniel H. Mcintosh, Jeyhan Kartaltepe, S. M. Faber, Harry Ferguson, Anton Koekemoer, Norman Grogin, Stijn Wuyts, Edmond Cheung, Christopher J. Conselice, Avishai Dekel, James S. Dunlop, Mauro Giavalisco, Mauro Giavalisco, Jessica Herrington, David C. Koo, Elizabeth J. Mcgrath, Duilia De Mello, Hans-Walter Rix, Aday R. Robaina, Christina C. Williams
What Turns Galaxies Off? The Different Morphologies Of Star-Forming And Quiescent Galaxies Since Z~2 From Candels, Eric F. Bell, Arjen Van Der Wel, Casey Papovich, Dale Kocevski, Jennifer Lotz, Daniel H. Mcintosh, Jeyhan Kartaltepe, S. M. Faber, Harry Ferguson, Anton Koekemoer, Norman Grogin, Stijn Wuyts, Edmond Cheung, Christopher J. Conselice, Avishai Dekel, James S. Dunlop, Mauro Giavalisco, Mauro Giavalisco, Jessica Herrington, David C. Koo, Elizabeth J. Mcgrath, Duilia De Mello, Hans-Walter Rix, Aday R. Robaina, Christina C. Williams
Mauro Giavalisco
We use HST/WFC3 imaging from the CANDELS Multicycle Treasury Survey, in conjunction with the Sloan Digital Sky Survey, to explore the evolution of galactic structure for galaxies with stellar masses >3e10M_sun from z=2.2 to the present epoch, a time span of 10Gyr. We explore the relationship between rest-frame optical color, stellar mass, star formation activity and galaxy structure. We confirm the dramatic increase from z=2.2 to the present day in the number density of non-star-forming galaxies above 3e10M_sun reported by others. We further find that the vast majority of these quiescent systems have concentrated light profiles, as parametrized by the …