116 citations · 189 across the 10 of their papers we have counts for
11 papers
Recurrent Multi-year Mg II BAL Variability in SDSS J1333+0012
M. Vivek, P. Aromal, R. Srianand +3
We present a long-term spectroscopic study of Broad Absorption Line (BAL) variability in the quasar J1333+0012 (\zem = 0.9197) using an extensive multi-epoch dataset spanning nearl…
Long Term (250 years) Hydrodynamical Simulation of the Supermassive Black Hole Binary OJ287
Ariel Chitan, Sarah C. Gallagher, Shahram Abbassi
With upcoming facilities capable of detecting photometric and gravitational wave signals from supermassive black hole (SMBH) binaries, studying their long-term accretion-driven var…
Investigating the AGN variability timescale -- black hole mass relationship with Gaia, SDSS and ZTF
Adrien Hélias, Sarah C. Gallagher, Pauline Barmby
Active galactic nuclei (AGNs) exhibit variability in their luminosities with timescales that correlate with the mass of the black hole at the centre of the AGN. Presently, the empi…
AGN--Host Galaxy Image Decomposition with JWST
Callum Dewsnap, Pauline Barmby, Sarah C. Gallagher
The ability to disentangle the light of an AGN from its host galaxy is strongly dependent on the spatial resolution and depth of the imaging. As the capabilities of imaging systems…
Characterizing the star cluster populations in Stephan's Quintet using HST and JWST observations
P. Aromal, S. C. Gallagher, K. Fedotov +14
Stephan's Quintet (SQ) is a local compact galaxy group system that exhibits significant star formation activity. A history of tidal interactions between its four member galaxies an…
SQ-A: A Collision Triggered Starburst in Intra-Group Medium of Stephan's Quintet
C. K. Xu, C. Cheng, M. S. Yun +12
We present new observational evidence supporting the hypothesis that SQ-A, a starburst in the intra-group medium (IGrM) of Stephan's Quintet (SQ), is triggered by a high-speed coll…
Transient LoBALs at high velocities: A Case of Extreme Broad Absorption Line Variability in J115636.82+085628.9
P. Aromal, R. Srianand, S. C. Gallagher +2
We present a multi-epoch spectroscopic study of the broad absorption line (BAL) quasar J115636.82+085628.9 (z(em) = 2.1077), based on five spectra spanning nearly two decades in th…
Bird's-eye View of Molecular Gas across Stephan's Quintet Galaxy Group and Intra-group Medium
B. H. C. Emonts, P. N. Appleton, U. Lisenfeld +15
We present the large-scale distribution and kinematics of cold molecular gas across the compact galaxy group Stephan's Quintet, based on CO(2-1) observations performed with the Ata…
Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C II] emission in the collisionally-formed bridge
B. W. Peterson, P. N. Appleton, T. Bitsakis +17
Using the PACS and SPIRE spectrometers on-board Herschel, we obtained observations of the Taffy galaxies (UGC 12914/12915) and bridge. The Taffy system is believed to be the result…
Shock-Enhanced C+ Emission and the Detection of H2O from Stephan's Quintet's Group-Wide Shock using Herschel
P. N. Appleton, P. Guillard, F. Boulanger +20
We present the first Herschel spectroscopic detections of the [OI]63 and [CII]158 micron fine-structure transitions, and a single para-H2O line from the 35 x 15 kpc^2 shocked inter…
Star Clusters in the Tidal Tails of Interacting Galaxies: Cluster Populations Across a Variety of Tail Environments
B. Mullan, I. S. Konstantopoulos, A. A. Kepley +17
We have searched for compact stellar structures within 17 tidal tails in 13 different interacting galaxies using F606W- and F814W- band images from the Wide Field Planetary Camera…