1.5k citations · 3.5k across the 21 of their papers we have counts for
16 papers · 1 filter
Torus skin outflow in a near-Eddington quasar revealed by spectropolarimetry
Nadia L. Zakamska, Rachael M. Alexandroff
Even when the direct view toward the active nucleus is obscured, nuclear emission propagating along other directions can scatter off surrounding material, become polarized and reac…
Powerful winds in high-redshift obscured and red quasars
Andrey Vayner, Nadia L. Zakamska, Rogemar A. Riffel +10
Quasar-driven outflows must have made their most significant impact on galaxy formation during the epoch when massive galaxies were forming most rapidly. To study the impact of qua…
Discovery of a Low-Redshift Damped Ly System in a Foreground Extended Disk Using a Starburst Galaxy Background Illuminator
Christopher M. Dupuis, Sanchayeeta Borthakur, Mansi Padave +3
We present the discovery of a low-redshift damped Ly (DLA) system in the spectrum of background starburst galaxy SDSS J111323.88+293039.3 (). The DLA is at an impact…
Spatially-resolved UV diagnostics of AGN feedback: radiation pressure dominates in a prototypical quasar-driven superwind
Jean Somalwar, Sean D. Johnson, Jonathan Stern +5
Galactic-scale winds driven by active galactic nuclei (AGN) are often invoked to suppress star formation in galaxy evolution models, but the mechanisms driving these outflows are h…
Host galaxies of high-redshift extremely red and obscured quasars
Nadia L. Zakamska, Ai-Lei Sun, Michael A. Strauss +9
We present Hubble Space Telescope 1.4-1.6 micron images of the hosts of ten extremely red quasars (ERQs) and six type 2 quasar candidates at z=2-3. ERQs, whose bolometric luminosit…
ERQs are the BOSS of Quasar Samples: The Highest-Velocity [OIII] Quasar Outflows
S. Perrotta, F. Hamann, N. L. Zakamska +3
We investigate Extremely Red Quasars (ERQs), a remarkable population of heavily-reddened quasars at redshift z2 - 3 that might be caught during a short-lived 'blow-out' phase…
Observing AGN feedback with CO intensity mapping
Patrick C. Breysse, Rachael M. Alexandroff
Current models of galaxy formation require star formation in high-mass galaxies to be limited by poorly understood mechanisms of quasar feedback. Feedback processes can be studied…
Spectropolarimetry of High Redshift Obscured and Red Quasars
Rachael M. Alexandroff, Nadia L. Zakamska, Aaron J. Barth +6
Spectropolarimetry is a powerful technique that has provided critical support for the geometric unification model of local active galactic nuclei. In this paper, we present optical…
Winds as the origin of radio emission in radio-quiet extremely red quasars
Hsiang-Chih Hwang, Nadia L. Zakamska, Rachael M. Alexandroff +4
Most active galactic nuclei (AGNs) are radio-quiet, and the origin of their radio emission is not well-understood. One hypothesis is that this radio emission is a by-product of qua…
The Hunt for Red Quasars: Luminous Obscured Black Hole Growth Unveiled in the Stripe 82 X-ray Survey
Stephanie M. LaMassa, Eilat Glikman, Marcella Brusa +18
We present results of a ground-based near-infrared campaign with Palomar TripleSpec, Keck NIRSPEC, and Gemini GNIRS to target two samples of reddened active galactic nucleus (AGN)…
Extremely Red Quasars in BOSS
Fred Hamann, Nadia L. Zakamska, Nicholas Ross +11
Red quasars are candidate young objects in an early transition stage of massive galaxy evolution. Our team recently discovered a population of extremely red quasars (ERQs) in the B…
Sensitive Radio Survey of Obscured Quasar Candidates
Rachael M. Alexandroff, Nadia L. Zakamska, Sjoert van Velzen +2
We study the radio properties of moderately obscured quasars over a range of redshifts to understand the role of radio activity in accretion using the Jansky Very Large Array (JVLA…
Discovery of extreme [OIII]5007A outflows in high-redshift red quasars
Nadia L. Zakamska, Fred Hamann, Isabelle Pâris +7
Black hole feedback is now a standard component of galaxy formation models. These models predict that the impact of black hole activity on its host galaxy likely peaked at z=2-3, t…
Indirect Evidence for Escaping Ionizing Photons in Local Lyman Break Galaxy Analogs
Rachael Alexandroff, Timothy Heckman, Sanchayeeta Borthakur +2
A population of early star-forming galaxies is the leading candidate for the re-ionization of the universe. It is still unclear what conditions and physical processes would enable…
Extremely Red Quasars from SDSS, BOSS and WISE: Classification of Optical Spectra
Nicholas P. Ross, Fred Hamann, Nadia L. Zakamska +10
Quasars with extremely red infrared-to-optical colours are an interesting population that can test ideas about quasar evolution as well as orientation, obscuration and geometric ef…
Near Infrared Spectra and Intrinsic Luminosities of Candidate Type II Quasars at 2 < z < 3.4
Jenny E Greene, Rachael Alexandroff, Michael A Strauss +10
We present JHK near-infrared (NIR) spectroscopy of 25 candidate Type II quasars selected from the Sloan Digital Sky Survey, using Triplespec on the Apache Point Observatory 3.5m te…