A challenge to dSph formation models: are the most isolated Local Group dSph galaxies truly old?
What is the origin of the different dwarf galaxy types? The classification into dwarf irregular (dIrr), spheroidal (dSph), and transition (dT) types is based on...
We have compiled a database of Chandra-HRC snapshot images covering most of the M31 disk. The database consists of 5 HRC fields. All fields were observed at 16...
We present results from a Chandra survey of 11 nearby, face-on spiral galaxies. 24 observations totaling 900 ks of new and archival Chandra data reveal more...
A Chandra/ACIS observation of the transient M31 ULX XMMU J004243.6+412519
We report on our ~4 ks Chandra ACIS observation of XMMU J004243.6+412519, an X-ray transient first reported by Henze et al. (2012a, Atel #3890) after its...
A chromospheric dark-cored fibril in Ca II IR spectra
We investigate the thermodynamical and magnetic properties of a ``dark-cored" fibril seen in the chromospheric Ca II IR line at 854.2 nm to determine the...
We present a high-resolution kinematical study of the ionized gas in the circumnuclear region of NGC 4314. Our spectra reveal the presence of a central...
A Combined Analysis of Jeans Kinematics and Milli-Second Pulsar Timing Effects: Probing the Mass Contents of Omega Centauri
We explore the interplay between Jeans analyses of velocity dispersions and millisecond-pulsar (MSP) timing measurements that trace line-of-sight accelerations...