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Automated Computer Vision Cluster Identification in the Fireworks Galaxy
Debby Tran, Benjamin F. Williams, Emily M. Levesque +5
We present the integrated photometry, radii, and spatial distribution of young ( 25 Myr) star cluster candidates in NGC 6946. NGC 6946, also known as the Fireworks Galaxy, is…
Spatially-Resolved Recent Star Formation History in NGC 6946
Debby Tran, Benjamin Williams, Emily Levesque +6
The nearby face-on star forming spiral galaxy NGC 6946 is known as the Fireworks Galaxy due to its hosting an unusually large number of supernova. We analyze its resolved near-ultr…
The Discovery of QSOs Behind M31 and M33
Philip Massey, Kathryn F. Neugent, Emily M. Levesque
We report the discovery of 11 newly found quasars behind the stellar disks of the spiral galaxies M31 and M33 in the fields covered by the Local Group Galaxy Survey. Their redshift…
Physical Properties of II Zw 40's Super Star Cluster and Nebula: New Insights and Puzzles from UV Spectroscopy
Claus Leitherer, Nell Byler, Janice C. Lee +1
We analyze far-ultraviolet spectra and ancillary data of the super star cluster SSC-N and its surrounding H II region in the nearby dwarf galaxy II Zw 40. From the ultraviolet spec…
Stellar and nebular diagnostics in the UV for star-forming galaxies
Nell Byler, Julianne Dalcanton, Charlie Conroy +4
There is a long history of using optical emission and absorption lines to constrain the metallicity and ionization parameters of gas in galaxies. However, comparable diagnostics ar…
A Mote in Andromeda's Disk: a Misidentified Periodic AGN Behind M31
Trevor Dorn-Wallenstein, Emily M. Levesque, John J. Ruan
We identify an object previously thought to be a star in the disk of M31, J0045+41, as a background AGN seen through a low-absorption region of M31. We present mode…