Aug 28 Frontiers

Ata Sarajedini

Overview of Research

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Aug 28 JC

Dan Gettings

TBD

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Sept 4 Frontiers

Fred Hamann

Quasars and Active Galaxies

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Sept 4 JC

Sara Gonzalez

UF Libraries

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Sept 11 Frontiers

Oleg Kargaltsev

Non-accreting Neutron Stars through the eyes of the flagship space observatories

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Sept 11 JC

Michael Butler

Some recent results on Infrared Dark Clouds

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Sept 25 Research Talk

Martin Durant

Optical Emission in X-ray Binaries: death of the reprocessing scenario and birth of dynamic interaction

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Oct 2 Frontiers

Jonathan Tan

Star Formation Near and Far

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Oct 9 Frontiers

Vicki Sarajedini

Overview of Research

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Oct 9 JC

Amanda Townsend

TBD

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Oct 16

No talk

Homecoming Holiday

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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

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Nov 6 JC

Benjamin Nelson

Applying Gravitational Lensing to the Exoplanet Search

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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

TBD

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Nov 20 JC

Bo Ma

TBD

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Dec 4 Frontiers

Charlie Telesco

TBD

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Dec 4 JC

Knicole Colon

TBD

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