Frontiers of Astrophysics, Journal Club

Fall 2009

Fri @ 12-1 p.m., Room 7 Bryant

References, Additional info.
Aug 28 Frontiers
Ata Sarajedini
Overview of Research
Aug 28 JC
Dan Gettings
Sept 4 Frontiers
Fred Hamann
Quasars and Active Galaxies
Sept 4 JC
Sara Gonzalez
UF Libraries
Sept 11 Frontiers
Oleg Kargaltsev
Non-accreting Neutron Stars through the eyes of the flagship space observatories
Sept 11 JC
Michael Butler
Some recent results on Infrared Dark Clouds
Sept 25 Research Talk
Martin Durant
Optical Emission in X-ray Binaries: death of the reprocessing scenario and birth of dynamic interaction
Oct 2 Frontiers
Jonathan Tan
Star Formation Near and Far
Oct 9 Frontiers
Vicki Sarajedini
Overview of Research
Oct 9 JC
Amanda Townsend
Oct 16
No talk
Homecoming Holiday
Oct 23 JC
Enrique Lopez Rodriguez (UF)
The dusty heart of nearby active galaxies
Hoenig, S. & Kishimoto, M., arXiv:0909.4539v1
Oct 23 JC
Jesus Martinez
Living in a void: Testing the Copernican Principle with Distant Supernovae
(Clifton et al. 2008, arXiv:0807.1443)
Oct 30 Guest Research Talk
Aaron Grocholski (STScI)
New Deep HST/ACS Photometry of NGC 1569: Constraining the Evolution of the Strongest Starburst in the Nearby Universe
Massive starbursts drive the evolution of galaxies at high redshift, but they can only be studied in detail in the nearby Universe where they are much rarer. The dwarf irregular galaxy NGC 1569 has always been considered the closest example of a true starburst, with exceptionally high sustained star formation (SF) over the last Gyr. This recent SF has been extensively constrainted by HST studies that reached to near the presumed magnitude of the tip of the red giant branch (TRGB). These studies could not address the onset of the most ancient SF or the triggering mechanism of the current starburst. Here we present new deep HST ACS/WFC photometry of the resolved stars in NGC 1569 that goes some 4 mag deeper than any previous HST observations. These data allowed us to unequivocally detect and measure the TRGB for the first time and show that NGC 1569 is considerably farther away than previously believed. At ~3 Mpc it is actually a member of the IC 342 group of galaxies, instead of being a starburst in isolation. In addition to the TRGB, our increased photometric depth also gives access to the fainter red clump and horizontal branch features in the I vs V-I color-magnitude diagram (CMD) of NGC 1569, allowing us to constrain for the first time even the most ancient SFH of this extreme starburst through the use of synthetic CMDs. The area sampled by our ACS/WFC observations is some 25 times larger than in previous HST studies, allowing us to characterize the spatial variations of the SFH, from the central star forming regions of NGC 1569 out into the older and more sparsely populated "halo". The results reveal the evolutionary status of this extreme starburst over cosmic time.
Nov 6 Frontiers
Steve Eikenberry
Black Hole Astrophysics and the FLAMINGOS-2 Early Science Surveys
Nov 6 JC
Benjamin Nelson
Applying Gravitational Lensing to the Exoplanet Search
Nov 13 Guest Research Talk
Roger Griffith (JPL)
The Advanced Camera for Surveys General Catalog (ACS-GC)
We use publicly available data obtained with the Advanced Camera for Surveys (ACS) instrument on the Hubble Space Telescope to construct the ACS General Cata- log (ACS-GC). The ACS-GC includes over 490,000 astronomical sources (stars + galax- ies) derived from the AEGIS, COSMOS, GEMS, and GOODS surveys. We include publicly available redshifts from the DEEP2, COMBO-17, TKRS, PEARS and zCOS- MOS surveys to supply redshifts for a considerable fraction (~62%) of the imaging sample. GALAPAGOS was used to construct photometric (SExtractor) and morpho- logical (GALFIT) catalogs. The morphological analysis assumes a single Sersic model for each object to derive quantitative structural parameters. Galaxy Zoo will measure visual morphologies for a large fraction of these galaxies. The ACS-GC includes color images, GALFIT residual images, a galaxy atlas, and a photometry + morphology + redshift catalog. The entire data set will be made publicly available through the NASA Extragalactic Database (NED) and LEVEL5.
Nov 20 JC
Robert Morehead
Observational Evidence for Tidal Destruction of Exoplanets
Jackson et al. 2009, ApJ, 698, 1357
Nov 20 JC
Bo Ma
First Detection of Polarized Scattered Light from an Exoplanetary Atmosphere
Berdyugina et al. 2008, ApJ, 637, 83
Dec 4 Frontiers
Charlie Telesco
Exploring Planet-Forming Disks with CanariCam on the GTC
Dec 4 JC
Knicole Colon
Previous talks: Spring 2009 Fall 2008