21 papers · 1 filter
An extended dust disk in a spiral galaxy; An occulting galaxy pair in ANGST
B. W. Holwerda, W. C. Keel, B. Williams +2
We present an analysis of an occulting galaxy pair, serendipitously discovered in ACS Nearby Galaxy Survey Treasury (ANGST) observations of NGC 253 taken with Hubble Space Telescop…
The ACS Nearby Galaxy Survey Treasury I. The Star Formation History of the M81 Outer Disk
Benjamin F. Williams, Julianne J. Dalcanton, Anil C. Seth +16
The ACS Nearby Galaxy Survey Treasury (ANGST) is a large Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) treasury program to obtain resolved stellar photometry for a…
New XMM-Newton analysis of three bright X-ray sources in M31 globular clusters, including a new black hole candidate
R. Barnard, H. Stiele, D. Hatzidimitriou +6
We present detailed analysis of three globular cluster X-ray sources in the XMM-Newton extended survey of M31. The X-ray counterpart to the M31 globular cluster Bo 45 (XBo 45) was…
The Chandra ACIS Survey of M33 (ChASeM33): Transient X-ray Sources Discovered in M33
Benjamin F. Williams, Terrance J. Gaetz, Frank Haberl +7
The Chandra ACIS Survey of M33 (ChASeM33) has acquired 7 fields of ACIS data covering M33 with 200 ks of exposure in each field. A catalog from the first 10 months of data, along w…
Chandra ACIS Survey of M33 (ChASeM33): A First Look
Paul P. Plucinsky, Benjamin Williams, Knox S. Long +22
We present an overview of the Chandra ACIS Survey of M33 (ChASeM33): A Deep Survey of the Nearest Face-on Spiral Galaxy. The 1.4 Ms survey covers the galaxy out to $R \approx 18\ar…
The Metallicity Distribution of Intracluster Stars in Virgo
Benjamin F. Williams, Robin Ciardullo, Patrick R. Durrell +11
We have used the Hubble Space Telescope's Advanced Camera for Surveys (ACS) to detect and measure ~5300 stars in a single intracluster field in the Virgo Cluster. By performing F60…