88 citations · 263 across the 17 of their papers we have counts for
10 papers · 1 filter
Separating the Optical to Near-Infrared Light of AGN and Their Host Galaxies
Callum Dewsnap, Pauline Barmby, Sarah C. Gallagher
The properties of galaxies that host active galactic nuclei (AGNs) offer clues to the conditions that enable accretion onto supermassive black holes. A galaxy's morphology can prov…
Classifying Quasar Types Without a Spectrum
Adrien Hélias, Pauline Barmby, Sarah C. Gallagher +2
Distinguishing between Type 1 and Type 2 quasars is important because it helps us understand accretion regimes, black hole mass scaling, disk instabilities and feedback processes i…
Star Clusters in Tidal Debris
Michael Rodruck, Jane Charlton, Sanchayeeta Borthakur +13
We present results of a Hubble Space Telescope (HST) UBVI-band study of star clusters in tidal tails, using new WFC3 and ACS imaging to complement existing WFPC2 data. We survey 12…
X-Rays Beware: The Deepest Chandra Catalogue of Point Sources in M31
N. Vulic, S. C. Gallagher, P. Barmby
This study represents the most sensitive Chandra X-ray point source catalogue of M31. Using 133 publicly available Chandra ACIS-I/S observations totalling ~1 Ms, we detected 795 X-…
Exploring X-ray Binary Populations in Compact Group Galaxies with
P. Tzanavaris, A. E. Hornschemeier, S. C. Gallagher +5
We obtain total galaxy X-ray luminosities, , originating from individually detected point sources in a sample of 47 galaxies in 15 compact groups of galaxies (CGs). For the gr…
Investigating the Structure of the Windy Torus in Quasars
S. C. Gallagher, J. E. Everett, M. M. Abado +1
Thermal mid-infrared emission of quasars requires an obscuring structure that can be modeled as a magneto-hydrodynamic wind in which radiation pressure on dust shapes the outflow.…
Faint X-ray Binaries and Their Optical Counterparts in M31
N. Vulic, S. C. Gallagher, P. Barmby
X-ray binaries (XRBs) are probes of both star formation and stellar mass, but more importantly remain one of the only direct tracers of the compact object population. To investigat…
A View of Point Sources in Hickson Compact Groups: High AGN fraction but a dearth of strong AGNs
P. Tzanavaris, S. C. Gallagher, A. E. Hornschemeier +6
We present X-ray point source catalogs for 9 Hickson Compact Groups (HCGs, 37 galaxies) at distances Mpc. We perform detailed X-ray point source detection and p…
High Signal-to-Noise Ratio Mid-Infrared Quasar Spectral Templates
Allison R. Hill, S. C. Gallagher, R. P. Deo +2
Mid-infrared (MIR) quasar spectra exhibit a suite of emission features including high ionization coronal lines from the narrow line region (NLR) illuminated by the ionizing continu…
Characterizing Quasars in the Mid-infrared: High Signal-to-Noise Spectral Templates
Allison R. Hill, S. C. Gallagher, R. P. Deo +2
Mid-infrared (MIR) quasar spectra exhibit a suite of emission features including high ionization coronal lines from the narrow line region illuminated by the ionizing continuum, br…