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M94 As A Unique Testbed for Black Hole Mass Estimates and AGN Activity At Low Luminosities
Anca Constantin, Anil Seth
We discuss the peculiar nature of the nucleus of M94 (NGC 4736) in the context of new measurements of the broad H_alpha emission from HST-STIS observations. We show that this compo…
Old Massive Globular Clusters and the Stellar Halo of the Dwarf Starburst Galaxy NGC 4449
Jay Strader, Anil C. Seth, Nelson Caldwell
We use Hubble Space Telescope imaging to show that the nearby dwarf starburst galaxy NGC 4449 has an unusual abundance of luminous red star clusters. Joint constraints from integra…
Resolved Near-Infrared Stellar Populations in Nearby Galaxies
Julianne J. Dalcanton, Benjamin F. Williams, Jason L. Melbourne +10
We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the resolved stellar populations within 26 fields of 23 nearby galaxies (<4 Mpc), based on F110W and F160W images…
Stellar Clusters in M31 from PHAT: Survey Overview and First Results
L. Clifton Johnson, Anil C. Seth, Julianne J. Dalcanton +9
The Panchromatic Hubble Andromeda Treasury (PHAT) is an on-going Hubble Space Telescope (HST) multi-cycle program that will image one-third of the M31 disk at high resolution, with…
The History of Star Formation in Galaxy Disks in the Local Volume as Measured by the ACS Nearby Galaxy Survey Treasury
Benjamin F. Williams, Julianne J. Dalcanton, L. C. Johnson +9
We present a measurement of the age distribution of stars residing in spiral disks and dwarf galaxies. We derive a complete star formation history of the ~140 Mpc^3 covered by the…
Star Clusters in M31: V. Internal Dynamical Trends: Some Troublesome, Some Reassuring
Jay Strader, Nelson Caldwell, Anil Seth
We present internal velocity dispersions and precise radial velocities for 200 globular clusters (GCs) in M31 that are derived using new high-resolution spectra from MMT/Hectochell…