An Infrared Comparison of Type-1 and Type-2 Quasars (2009)
Hiner, Kyle D., Canalizo, Gabriela, Lacy, Mark, Sajina, Anna, Armus, Lee, Ridgway, Susan, ...
We model the optical to far-infrared SEDs of a sample of six type-1 and six type-2 quasars selected in the mid-infrared. The objects in our sample are matched in mid-IR luminosity and selected based...
Walsh, Jonelle L., Minezaki, Takeo, Bentz, Misty C., Barth, Aaron J., Baliber, Nairn, Li, Weidong, ...
The Lick AGN Monitoring Project targeted 13 nearby Seyfert 1 galaxies with the intent of measuring the masses of their central black holes using reverberation mapping. The sample includes 12 galaxies...
Shell Galaxies, Dynamical Friction, and Dwarf Disruption (2009)
Ebrova, Ivana, Jungwiert, Bruno, Canalizo, Gabriela, Bennert, Nicola, Jilkova, Lucie
Using N-body simulations of shell galaxies created in nearly radial minor mergers, we investigate the error of collision dating, resulting from the neglect of dynamical friction and of gradual...
Shell Galaxies: Dynamical Friction, Gradual Satellite Decay and Merger Dating (2009)
Ebrova, Ivana, Jungwiert, Bruno, Canalizo, Gabriela, Bennert, Nicola, Jilkova, Lucie
With the goal to refine modelling of shell galaxies and the use of shells to probe the merger history, we develop a new method for implementing dynamical friction in test-particle simulations of...
Bentz, Misty C., Walsh, Jonelle L., Barth, Aaron J., Baliber, Nairn, Bennert, Nicola, Canalizo, Gabriela, ...
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 12 nearby (z < 0.05)...
First Results from the Lick AGN Monitoring Project: The Mass of the Black Hole in Arp 151 (2008)
Bentz, Misty C., Walsh, Jonelle L., Barth, Aaron J., Baliber, Nairn, Bennert, Nicola, Canalizo, Gabriela, ...
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 13 nearby (z < 0.05)...
Quasar Black Hole Masses from Velocity Dispersions (2008)
Canalizo, Gabriela, Wold, Margrethe, Lazarova, Mariana, Lacy, Mark
Much progress has been made in measuring black hole (BH) masses in (non-active) galactic nuclei using the tight correlation between stellar velocity dispersions sigma in galaxies and the mass of...
Fueling QSOs: The Relevance of Mergers (2008)
Bennert, Nicola, Canalizo, Gabriela, Jungwiert, Bruno, Stockton, Alan, Schweizer, Francois, Peng, Chien Y., ...
To study the relevance of mergers for the fueling of QSOs, we are currently conducting an HST imaging campaign of a sample of QSO host galaxies classified as ellipticals in the literature. Here, we...
Quasar Black Hole Masses from Velocity Dispersions (2008)
Canalizo, Gabriela, Wold, Margrethe, Lazarova, Mariana, Lacy, Mark
Much progress has been made in measuring black hole (BH) masses in (non-active) galactic nuclei using the tight correlation between stellar velocity dispersions (sigma) in galaxies and the mass of...
Evidence for merger remnants in early-type host galaxies of low-redshift QSOs (2008)
Bennert, Nicola, Canalizo, Gabriela, Jungwiert, Bruno, Stockton, Alan, Schweizer, Francois, Peng, Chien Y., ...
We present results from a pilot HSTACS deep imaging study in broadband Vof five low-redshift QSO host galaxies classified in the literature as ellipticals. The aim of our study is to determine...
Evidence for Merger Remnants in Early-Type Host Galaxies of Low-Redshift QSOs (2008)
Bennert, Nicola, Canalizo, Gabriela, Jungwiert, Bruno, Stockton, Alan, Schweizer, Francois, Peng, Chien Y., ...
We present results from a pilot HST ACS deep imaging study in broad-band V of five low-redshift QSO host galaxies classified in the literature as ellipticals. The aim of our study is to determine...
Alan Stockton, Gabriela Canalizo, Toshinori Maihara
We describe observations of a galaxy in the field of the z = 2.483 radio galaxy 4C23.56, photometrically selected to have a spectral-energy distribution consistent with an old stellar population at...
Stellar Populations in the Host Galaxies of Mrk 1014, IRAS 07598+6508, and Mrk 231 (2007)
Gabriela Canalizo And, Gabriela Canalizo, Alan Stockton
We present deep spectroscopic and imaging data of the host galaxies of Mrk 1014, IRAS 07598+6508, and Mrk 231. These objects form part of both the QSO and the ultraluminous infrared galaxy #ULIG#...
PG 1700+518 Revisited: Adaptive Optics Imaging and a Revised Starburst Age for the Companion (2007)
Alan Stockton, Gabriela Canalizo, Laird M. Close
We present the results of adaptive-optics imaging of the z = 0:2923 QSO PG1700+518 in the J and H bands. The extension to the north of the QSO is clearly seen to be a discrete companion with a...
Spectacular shells in the host galaxy of the QSO MC2 1635+119 (2007)
Canalizo, Gabriela, Bennert, Nicola, Jungwiert, Bruno, Stockton, Alan, Schweizer, François, Lacy, Mark, ...
We present deep HST ACS images and Keck spectroscopy of MC2 1635+119, a QSO hosted by a galaxy previously classified as an undisturbed elliptical galaxy. Our new images reveal dramatic shell...
Bennert, Nicola, Canalizo, Gabriela, Jungwiert, Bruno, Stockton, Alan, Schweizer, Francois, Peng, Chien, ...
We present very deep HST/ACS images of five QSO host galaxies, classified as undisturbed ellipticals in earlier studies. For four of the five objects, our images reveal strong signs of interaction...
Morphologies of Two Massive Old Galaxies at z ~ 2.5 (2007)
Stockton, Alan, McGrath, Elizabeth, Canalizo, Gabriela, Iye, Masanori, Maihara, Toshinori
We present the results of NICMOS imaging of two massive galaxies photometrically selected to have old stellar populations at z ~ 2.5. Both galaxies are dominated by apparent disks of old stars,...
Spectacular Shells in the Host Galaxy of the QSO MC2 1635+119 (2007)
Canalizo, Gabriela, Bennert, Nicola, Jungwiert, Bruno, Stockton, Alan, Schweizer, Francois, Lacy, Mark, ...
We present deep HST/ACS images and Keck spectroscopy of MC2 1635+119, a QSO hosted by a galaxy previously classified as an undisturbed elliptical. Our new images reveal dramatic shell structure...
Stellar Populations of Luminous Evolved Galaxies at z~1.5 (2007)
McGrath, Elizabeth J., Stockton, Alan, Canalizo, Gabriela
Observational evidence has been mounting over the past decade that at least some luminous (~2 L*) galaxies have formed nearly all of their stars within a short period of time only 1-2x10^9 years...
Morphologies and Color Gradients of Luminous Evolved Galaxies at z~1.5 (2007)
McGrath, Elizabeth J., Stockton, Alan, Canalizo, Gabriela, Iye, Masanori, Maihara, Toshinori
We have examined in detail the morphologies of seven z~1.5 passively evolving luminous red galaxies using high resolution HST NICMOS and ACS imaging data. Almost all of these galaxies appear to be...
Block, David L., Combes, Francoise, Puerari, Ivanio, Freeman, Kenneth C., Stockton, Alan, Canalizo, Gabriela, ...
In an earlier study of the spiral galaxy M33, we photometrically identified arcs or outer spiral arms of intermediate age (0.6 Gyr - 2 Gyr) carbon stars precisely at the commencement of the HI-warp....
HUBBLE SPACE TELESCOPE ULTRAVIOLET SPECTROSCOPY OF 14 LOW-REDSHIFT QUASARS (2007)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low-redshift (zem ≤ 0:8) quasars observed with the Hubble Space Telescope STIS as part of a Snapshot project to understand the relationship...
The Nature of Optical Features in the Inner Region of the 3C48 Host Galaxy (2007)
Stockton, Alan, Canalizo, Gabriela, Fu, Hai, Keel, William
The well-known quasar 3C48 is the most powerful compact steep-spectrum radio-loud QSO at low redshifts. It also has two unusual optical features within the radius of the radio jet (~1"): (1) an...
Alan Stockton, Elizabeth Mcgrath, Gabriela Canalizo, Masanori Iye, Toshinori Maihara
We present the results of NICMOS imaging of two massive galaxies photometrically selected to have old stellar populations at z ∼ 2.5. Both galaxies are dominated by apparent disks of old stars,...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, L. Aldcroft, Thomas, ...
We present low-resolution ultraviolet spectra of 14 low redshift (z em < 0.8) quasars observed with HST/STIS as part of a Snap project to understand the relationship between quasar outflows and...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low redshift (z
Extremely Red Objects in Two Quasar Fields at z ~ 1.5 (2006)
Stockton, Alan, McGrath, Elizabeth, Canalizo, Gabriela
We present an investigation of the properties and environments of bright extremely red objects (EROs) found in the fields of the quasars TXS 0145+386 and 4C 15.55, both at z ~ 1.4. There is marginal...
Adaptive Optics Imaging Survey of Luminous Infrared Galaxies (2006)
Laag, Edward A., Canalizo, Gabriela, Van Breugel, Wil, Gates, Elinor L., De Vries, Wim, Stanford, S. Adam
We present high resolution imaging observations of a sample of previously unidentified far-infrared galaxies at z < 0.3. The objects were selected by cross-correlating the IRAS Faint Source Catalog...
Star Formation in QSO Host Galaxies (2006)
Canalizo, Gabriela, Stockton, Alan, Brotherton, Michael S., Lacy, Mark
Many of the conditions that are necessary for starbursts appear to be important in the triggering of QSOs. However, it is still debatable whether starbursts are ubiquitously present in galaxies...
Extended X-Ray Emission from QSOs (2005)
Stockton, Alan, Fu, Hai, Henry, J. Patrick, Canalizo, Gabriela
We report Chandra ACIS observations of the fields of 4 QSOs showing strong extended optical emission-line regions. Two of these show no evidence for significant extended X-ray emission. The remaining...
Penetrating Dust Tori in AGN (2004)
Canalizo, Gabriela, Max, Claire, Antonucci, Robert, Whysong, David, Stockton, Alan, Lacy, Mark
We present preliminary results from high resolution (~ 0.05") adaptive optics observations of Cygnus A. The images show a bi-conic structure strongly suggestive of an obscuring torus around a quasar...
A Disk Galaxy of Old Stars at z ~ 2.5 (2003)
Stockton, Alan, Canalizo, Gabriela, Maihara, Toshinori
We describe observations of a galaxy in the field of the $z=2.483$ radio galaxy 4C 23.56, photometrically selected to have a spectral-energy distribution consistent with an old stellar population at...
Two Active Nuclei in 3C294 (2003)
Stockton, Alan, Canalizo, Gabriela, Nelan, E. P., Ridgway, Susan E.
The z=1.786 radio galaxy 3C294 lies
Adaptive Optics Imaging and Spectroscopy of Cygnus A: I. Evidence for a Minor Merger (2003)
Canalizo, Gabriela, Max, Claire, Whysong, David, Antonucci, Robert, Dahm, Scott E.
We present Keck II adaptive optics near infrared imaging and spectroscopic observations of the central regions of the powerful radio galaxy Cygnus A. The 0.05" resolution images clearly show an...
Koenigsberger, Gloria, Canalizo, Gabriela, Arrieta, Anabel, Richer, Michael G., Georgiev, Leonid
We present high resolution spectroscopic observations of the massive X-ray binary system LS I+65 010=2S 0114+650 in the optical wavelength region. A correlation between equivalent width and radial...
Observations of quasar hosts with adaptive optics at Lick Observatory (2002)
Lacy, Mark, Gates, Elinor L., Ridgway, Susan E., De Vries, Wim, Canalizo, Gabriela, Lloyd, James P., ...
We present near-infrared H-band observations of the hosts of three z~1 quasars from the Sloan Digital Sky Survey made with the adaptive optics system at Lick Observatory. We derive a PSF for each...
Brotherton, Michael S., Grabelsky, Matthew, Canalizo, Gabriela, Van Breugel, Wil, Filippenko, Alexei V., Croom, Scott, ...
We present new Hubble Space Telescope (HST) WFPC2 images of the post-starburst quasar UN J1025-0040, which contains both an active galactic nucleus (AGN) and a 400-Myr-old nuclear starburst of...
Low-Ionization BAL QSOs in Ultraluminous Infrared Systems (2001)
Canalizo, Gabriela, Stockton, Alan
Low-ionization broad absorption line (BAL) QSOs present properties that cannot generally be explained by simple orientation effects. We have conducted a deep spectroscopic and imaging study of the...
Quasi-Stellar Objects, Ultraluminous IR Galaxies, and Mergers (2001)
Canalizo, Gabriela, Stockton, Alan
We test the hypothesis that QSOs are formed via strong tidal interactions or mergers, initially going through an ultraluminous infrared phase, by looking for traces to this phase in the host galaxies...
Stellar Populations in the Host Galaxies of Mrk 1014, IRAS 07598+6508, and Mrk 231 (2000)
Canalizo, Gabriela, Stockton, Alan
We present deep spectroscopic and imaging data of the host galaxies of Mrk 1014, IRAS 07598+6508, and Mrk 231. These objects form part of both the QSO and the ultraluminous infrared galaxy (ULIG)...
A Companion Galaxy to the Post-Starburst Quasar UN J1025-0040 (1999)
Canalizo, Gabriela, Stockton, Alan, Brotherton, M. S., Van Breugel, Wil
UN J1025-0040 is a quasar at z = 0.6344 that shows an extremely bright post starburst population of age ~ 400 Myr (Brotherton et al. 1999). Images of UN J1025-0040 show a nearly stellar object 4.2...
3C 48: Stellar Populations and the Kinematics of Stars and Gas in the Host Galaxy (1999)
Canalizo, Gabriela, Stockton, Alan
We present deep Keck LRIS spectroscopy of the host galaxy of 3C 48. Our observations at various slit positions sample the different luminous components near the quasar, including the apparent tidal...
High-Resolution K' Imaging of the z = 1.786 Radio Galaxy 3C 294 (1999)
Stockton, Alan, Canalizo, Gabriela, Ridgway, Susan E.
We have obtained imaging in the K' band (~I-band rest frame) of the z=1.786 radio galaxy 3C 294 with the 36-element curvature-sensing adaptive optics system Hokupa`a and the Canada-France-Hawaii...
PG 1700+518 Revisited: Adaptive Optics Imaging and a Revised Starburst Age for the Companion (1998)
Stockton, Alan, Canalizo, Gabriela, Close, Laird M.
We present the results of adaptive-optics imaging of the z=0.2923 QSO PG 1700+518 in the J and H bands. The extension to the north of the QSO is clearly seen to be a discrete companion with a...
Serendipitous Discovery of a BAL QSO at z = 2.169 (1997)
Canalizo, Gabriela, Stockton, Alan, Roth, Katherine C.
We report the serendipitous discovery of a BAL QSO at z = 2.169, located 41'' southwest of 3C 48. We present Keck LRIS spectroscopy covering rest frame 1500 A to 2300 A . The C IV BAL has three...
Spectroscopy of Close Companions to QSOs and the Ages of Interaction-Induced Starbursts (1997)
Canalizo, Gabriela, Stockton, Alan
We present low-resolution absorption-line spectra of three candidate close ( < 3 arcsec) companions to the low redshift QSOs 3CR 323.1, PG 1700+518, and PKS 2135-147. The spectra were obtained with...