169 citations · 2.6k across the 55 of their papers we have counts for
23 papers · 1 filter
The Compton-thick AGN Population and the Distribution of Low-mass AGN in our Cosmic Backyard
A. Annuar, D. M. Alexander, P. Gandhi +21
We present a census of the Compton-thick (CT) active galactic nucleus (AGN) population and the column density () distribution of AGN in our cosmic backyard using a mid-…
The NuSTAR Local AGN Distribution Survey (NuLANDS) I: Towards a Truly Representative Column Density Distribution in the Local Universe
Peter G. Boorman, Poshak Gandhi, Johannes Buchner +33
Hard X-ray-selected samples of Active Galactic Nuclei (AGN) provide one of the cleanest views of supermassive black hole accretion, but are biased against objects obscured by Compt…
A population of Optically Quiescent Quasars from WISE and SDSS
Claire Greenwell, Poshak Gandhi, Daniel Stern +4
The growth of active galactic nuclei (AGN) occurs under some form of obscuration in a large fraction of the population. The difficulty in constraining this population leads to high…
Discovery of 24 radio-bright quasars at using low-frequency radio observations
A. J. Gloudemans, K. J. Duncan, A. Saxena +18
High redshift quasars () that also shine brightly at radio wavelengths are unique signposts of supermassive black hole activity in the early universe. However, bright radio so…
NuSTAR observations of a heavily X-ray obscured AGN in the dwarf galaxy J144013+024744
Shrey. Ansh, Chien-Ting J. Chen, W. N. Brandt +10
We present a multi-wavelength analysis of the dwarf Seyfert-2 galaxy J, a candidate obscured active galactic nucleus (AGN) thought to be powered by an intermediate-m…
Quasar Feedback Survey: Multi-phase outflows, turbulence and evidence for feedback caused by low power radio jets inclined into the galaxy disk
A. Girdhar, C. M. Harrison, V. Mainieri +18
We present a study of a luminous, z=0.15, type-2 quasar (log [L([OIII])/(erg/s)]=42.8) from the Quasar Feedback Survey. It is classified as 'radio-quiet' (log [L(1.4 GHz)/(W/Hz)]=2…
A hard X-ray view of Luminous and Ultra-luminous Infrared Galaxies in GOALS: I - AGN obscuration along the merger sequence
C. Ricci, G. C. Privon, R. W. Pfeifle +25
The merger of two or more galaxies can enhance the inflow of material from galactic scales into the close environments of Active Galactic Nuclei (AGN), obscuring and feeding the su…
A candidate Optically Quiescent Quasar lacking narrow emission lines
Claire Greenwell, Poshak Gandhi, Daniel Stern +5
Many Active Galactic Nuclei (AGN) surveys rely on optical emission line signatures for robust source classification. There are, however, examples of luminous AGN candidates lacking…
The Quasar Feedback Survey: Discovering hidden Radio-AGN and their connection to the host galaxy ionised gas
M. E. Jarvis, C. M. Harrison, V. Mainieri +18
We present the first results from the Quasar Feedback Survey, a sample of 42 z<0.2, [O III] luminous AGN (L[O III]>10^42.1 ergs/s) with moderate radio luminosities (i.e. L(1.4GHz)>…
High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets
M. E. Jarvis, C. M. Harrison, V. Mainieri +11
We use a sample of powerful z~0.1 type 2 quasars ('obscured'; log[L(AGN)/erg/s]>~45), which host kiloparsec-scale ionized outflows and jets, to identify possible signatures of AGN…
Prevalence of radio jets associated with galactic outflows and feedback from quasars
M. E. Jarvis, C. M. Harrison, A. P. Thomson +7
We present 1-7 GHz high-resolution radio imaging (VLA and e-MERLIN) and spatially-resolved ionized gas kinematics for ten z<0.2 type~2 `obscured' quasars (log [L(AGN)/(erg/s)]>~45)…
A new class of flares from accreting supermassive black holes
Benny Trakhtenbrot, Iair Arcavi, Claudio Ricci +26
Accreting supermassive black holes (SMBHs) can exhibit variable emission across the electromagnetic spectrum and over a broad range of timescales. The variability of active galacti…
The Multiple Merger Assembly of a Hyper-luminous Obscured Quasar at redshift 4.6
T. Diaz-Santos, R. J. Assef, A. W. Blain +10
Galaxy mergers and gas accretion from the cosmic web drove the growth of galaxies and their central black holes at early epochs. We report spectroscopic imaging of a multiple merge…
NuSTAR and Keck Observations of Heavily Obscured Quasars Selected by WISE
Wei Yan, Ryan C. Hickox, Kevin N. Hainline +15
A primary aim of the Nuclear Spectroscopic Telescope Array (NuSTAR) mission is to find and characterize heavily obscured Active Galactic Nuclei (AGNs). Based on mid-infrared photom…
Storm in a Teacup: X-ray view of an obscured quasar and superbubble
G. B. Lansbury, M. E. Jarvis, C. M. Harrison +5
We present the X-ray properties of the 'Teacup AGN' (SDSS J1430+1339), a type 2 quasar which is interacting dramatically with its host galaxy. Spectral modelling of the c…
The NuSTAR Extragalactic Surveys: source catalog and the Compton-thick fraction in the UDS field
A. Masini, F. Civano, A. Comastri +19
We present the results and the source catalog of the NuSTAR survey in the UKIDSS Ultra Deep Survey (UDS) field, bridging the gap in depth and area between NuSTAR's ECDFS and COSMOS…
Heavy X-ray obscuration in the most-luminous galaxies discovered by WISE
F. Vito, W. N. Brandt, D. Stern +11
Hot Dust-Obscured Galaxies (Hot DOGs) are hyperluminous () infrared galaxies with extremely high (up to hundreds of K) dust tempe…
Joint NuSTAR and Chandra analysis of the obscured quasar in IC 2497 - Hanny's Voorwerp system
Lia F. Sartori, Kevin Schawinski, Michael J. Koss +9
We present new Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the core of IC 2497, the galaxy associated with Hanny's Voorwerp. The combined fits of the Chandra (0.…
Hard X-ray selected AGNs in low-mass galaxies from the NuSTAR serendipitous survey
C. -T. J. Chen, W. N. Brandt, A. E. Reines +14
We present a sample of 10 low-mass active galactic nuclei (AGNs) selected from the 40-month NuSTAR serendipitous survey. The sample is selected to have robust NuSTAR detections at…
The Geometry of the Infrared and X-ray Obscurer in a Dusty Hyperluminous Quasar
Duncan Farrah, Mislav Balokovic, Daniel Stern +24
We study the geometry of the AGN obscurer in IRAS 09104+4109, an IR-luminous, radio-intermediate FR-I source at , using infrared data from Spitzer and Herschel, X-ray data…
NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE-Selected Quasars at z ~ 2
D. Stern, G. B. Lansbury, R. J. Assef +30
We report on a NuSTAR and XMM-Newton program that has observed a sample of three extremely luminous, heavily obscured WISE-selected AGN at z~2 in a broad X-ray band (0.1 - 79 keV).…
NuSTAR J033202-2746.8: direct constraints on the Compton reflection in a heavily obscured quasar at z~2
A. Del Moro, J. R. Mullaney, D. M. Alexander +25
We report NuSTAR observations of NuSTAR J033202-2746.8, a heavily obscured, radio-loud quasar detected in the Extended Chandra Deep Field-South, the deepest layer of the NuSTAR ext…
Barred S0 Galaxies in the Coma Cluster
George B. Lansbury, John R. Lucey, Russell J. Smith
This study uses r-band images from the Eighth Data Release of the Sloan Digital Sky Survey (SDSS DR8) to study bars in lenticular (S0) galaxies in one of the nearest rich cluster e…