5 papers · 1 filter
A Keck/Deimos Survey of Red Giant Branch Stars in the Outskirts of M31
Annette Ferguson, Scott Chapman, Rodrigo Ibata +3
We are using the DEIMOS multi-object spectrograph on the Keck II 10m telescope to conduct a spectroscopic survey of red giant branch stars in the outskirts of M31. To date, velocit…
Newly Discovered Globular Clusters in the Outer Halo of M31
A. Huxor, N. R. Tanvir, M. Irwin +4
We present nine newly discovered globular clusters in the outer halo of M31, found by a semi-automated procedure from a INT Wide Field Camera survey of the region. The sample inclu…
Tidal Remnants and Intergalactic HII Regions
T. Oosterloo, R. Morganti, E. M. Sadler +3
We report the discovery of two small intergalactic HII regions in the loose group of galaxies around the field elliptical NGC 1490. The HII regions are located at least 100 kpc fro…
The Extreme Outer Regions of Disk Galaxies: Star Formation and Metal Abundances
A. M. N. Ferguson, R. F. G. Wyse, J. S. Gallagher
The extreme outer regions of disk galaxies, lying at or beyond the classical optical radius defined by R25, present an opportunity to study star formation and chemical evolution un…
Diffuse Ionized Gas in Spiral Galaxies: Probing Photon Leakage from HII Regions?
Annette M. N. Ferguson, Rosemary F. G. Wyse, J. S. Gallagher +1
As part of a large study to map the distribution of star formation across galactic disks, we have obtained deep Halpha images of the nearby Sculptor Group spirals NGC 247 and NGC 7…