The Evolution Of Qso Spectra: (2007)
Evidence For Microlensing, Paul J. Francis, Anuradha Koratkar
. We find that the spectra of QSOs evolve: high redshift QSOs (z ? 1:5) have lower equivalent width emission lines than low redshift QSOs (z ! 0:5) with the same luminosities and radio properties. We...
Paul J. Francis, Anuradha Koratkar
We study the rest-frame UV spectra of two samples of QSOs, a low redshift (z 0:4) sample drawn from the IUE archives, and a high redshift (z 2:2) optically selected sample, the Large Bright QSO...
Intrinsic Curvature in the X-ray Spectra of BL Lacertae Objects (2005)
Perlman, Eric S., Madejski, Greg, Georganopoulos, Markos, Andersson, Karl, Dougherty, Timothy, Krolik, Julian, ...
We report results from {\it XMM-Newton} observations of thirteen X-ray bright BL Lacertae objects, selected from the {\it Einstein} Slew Survey sample. The survey was designed to look for evidence of...
Quasars and the Big Blue Bump (2004)
Shang, Zhaohui, Brotherton, Michael S., Green, Richard F., Kriss, Gerard A., Scott, Jennifer, Quijano, Jessica Kim, ...
We investigate the ultraviolet-to-optical spectral energy distributions (SEDs) of 17 active galactic nuclei (AGNs) using quasi-simultaneous spectrophotometry spanning 900-9000 Angstrom (rest frame)....
BL Lac X-ray Spectra: simpler than we thought (2004)
Perlman, Eric S., Daugherty, Timothy, Koratkar, Anuradha, Madejski, Grzegorz, Andersson, Karl, Krolik, Julian H., ...
We report results from {\it XMM-Newton} observations of thirteen X-ray bright BL Lacertae objects, selected from the {\it Einstein} Slew Survey sample. The spectra are generally well fit by power-law...
HST STIS Observations of PG 0946+301: the Highest Quality UV Spectrum of a BALQSO (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T., Crenshaw, D. Michael, Van Breugel, Wil, Brotherton, Michael, ...
We describe deep (40 orbits) HST/STIS observations of the BALQSO PG 0946+301 and make them available to the community. These observations are the major part of a multi-wavelength campaign on this...
Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing (1999)
Edelson, Rick, Koratkar, Anuradha, Nandra, Kirpal, Goad, Michael, Peterson, Bradley M., Collier, Stefan, ...
During 1998 April 13-16, NGC 3516 was monitored almost continuously with HST for 10.3 hr in the UV and 2.8 d in the optical, and simultaneous RXTE and ASCA monitoring covered the same period. The...
On the absence of broad MgII emission-line variability in NGC 3516 during 1996 (1999)
Goad, Michael, Koratkar, Anuradha, Axon, David, Korista, Kirk, O'Brien, Paul
Also archived in: arXiv:astro-ph/9812351 v1 18 Dec 1998
Delgado, Rosa M. Gonzalez, Heckman, Timothy, Leitherer, Claus, Meurer, Gerhardt, Krolik, Julian, Wilson, Andrew, ...
We present and discuss HST (WFPC2 and FOC) images and UV GHRS spectra plus ground-based near UV through to near IR spectra of three Seyfert 2 nuclei (NGC 7130, NGC 5135 and IC 3639). These galaxies,...
Below the Lyman Edge: UV Polarimetry of Quasars (1998)
Koratkar, Anuradha, Antonucci, Robert, Goodrich, Robert, Storrs, Alex
The Lyman edge at 912 \AA is an important diagnostic region for studying quasi-stellar objects (QSOs). In particular, it reveals a great deal about the physical conditions within the atmospheres of...
The Ultraviolet Spectra of LINERs: A Comparative Study (1997)
Maoz, Dan, Koratkar, Anuradha, Shields, Joseph C., Ho, Luis C., Filippenko, Alexei V., Sternberg, Amiel
Imaging studies have shown that about 25% of LINER galaxies display a compact nuclear UV source. As part of a program to study the nature of LINERs and their connection to the active galaxy...
Monitoring Ly alpha Emission from the Blazar 3C 279 (1997)
Koratkar, Anuradha, Pian, Elena, Urry, C. Megan, Pesce, Joseph E.
The blazar 3C 279 is well studied and shows frequent large continuum flares from radio to gamma-ray wavelengths. There have been a number of multi-wavelength observations of 3C 279, and hence there...
Thesis (Doctoral)--University of Michigan, 1990.