Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Koratkar, Anuradha"'
Autor:
Perlman, Eric S., Madejski, Greg, Georganopoulos, Markos, Andersson, Karl, Dougherty, Timothy, Krolik, Julian, Rector, Travis, Stocke, John T., Koratkar, Anuradha, Wagner, Stefan, Aller, Margo, Aller, Hugh, Allen, Mark G.
Publikováno v:
Astrophys.J. 625 (2005) 727-740
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 departures of the X-ray spectra from a simple powe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502298
Autor:
Shang, Zhaohui, Brotherton, Michael S., Green, Richard F., Kriss, Gerard A., Scott, Jennifer, Quijano, Jessica Kim, Blaes, Omer, Hubeny, Ivan, Hutchings, John, Kaiser, Mary Elizabeth, Koratkar, Anuradha, Oegerle, William, Zheng, Wei
Publikováno v:
Astrophys.J. 619 (2005) 41-59
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). We employ data from the Far Ultraviolet Spectroscop
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409697
Autor:
Perlman, Eric S., Daugherty, Timothy, Koratkar, Anuradha, Madejski, Grzegorz, Andersson, Karl, Krolik, Julian H., Aller, Hugh, Aller, Margo, Stocke, John T., Rector, Travis A., Padovani, Paolo, Allen, Mark, Wagner, Stefan
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 models, with four objects having hard ($\alpha<1;
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403575
Autor:
Arav, Nahum, de Kool, Martijn, Korista, Kirk T., Crenshaw, D. Michael, van Breugel, Wil, Brotherton, Michael, Green, Richard F., Pettini, Max, Wills, Bev, de Vries, Wim, Becker, Bob, Brandt, W. N., Green, Paul, Junkkarinen, Vesa T., Koratkar, Anuradha, Laor, Ari, Laurent-Muehleisen, Sally A., Mathur, Smita, Murray, Norman
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 object aimed at determining the ionization equilibrium
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107414
Autor:
Edelson, Rick, Koratkar, Anuradha, Nandra, Kirpal, Goad, Michael, Peterson, Bradley M., Collier, Stefan, Krolik, Julian, Malkan, Matthew, Maoz, Dan, O'Brien, Paul, Shull, J. Michael, Vaughan, Simon, Warwick, Robert
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 X-rays were strongly variable with the soft (0.5-2 keV
Externí odkaz:
http://arxiv.org/abs/astro-ph/9912266
Autor:
Ho, Luis C., Ptak, Andrew, Terashima, Yuichi, Kunieda, Hideyo, Serlemitsos, Peter J., Yaqoob, Tahir, Koratkar, Anuradha P.
We obtained observations of NGC 4639 with ASCA in order to investigate its mildly active Seyfert 1 nucleus at hard X-ray energies. Koratkar et al. (1995) have previously shown that the nucleus is a pointlike source in the ROSAT soft X-ray band. We de
Externí odkaz:
http://arxiv.org/abs/astro-ph/9905013
Autor:
Delgado, Rosa M. Gonzalez, Heckman, Timothy, Leitherer, Claus, Meurer, Gerhardt, Krolik, Julian, Wilson, Andrew, Kinney, Anne, Koratkar, Anuradha
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, together to Mrk 477, were selected from a bigger sa
Externí odkaz:
http://arxiv.org/abs/astro-ph/9806107
Publikováno v:
Astrophys.J. 503 (1998) 599
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 accretion disks, a ubiquitous component of QSO theor
Externí odkaz:
http://arxiv.org/abs/astro-ph/9804006
Autor:
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 phenomenon, we compare the HST ultraviolet (1150-3200 Ang) s
Externí odkaz:
http://arxiv.org/abs/astro-ph/9710323
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 are many ultraviolet data for this object available
Externí odkaz:
http://arxiv.org/abs/astro-ph/9709086