Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Strateva, Iskra"'
Autor:
Zakamska, Nadia L., Lampayan, Kelly, Petric, Andreea, Dicken, Daniel, Greene, Jenny E., Heckman, Timothy M., Hickox, Ryan C., Ho, Luis C., Krolik, Julian H., Nesvadba, Nicole P. H., Strauss, Michael A., Geach, James E., Oguri, Masamune, Strateva, Iskra V.
Radio emission from radio-quiet quasars may be due to star formation in the quasar host galaxy, to a jet launched by the supermassive black hole, or to relativistic particles accelerated in a wide-angle radiatively-driven outflow. In this paper we ex
Externí odkaz:
http://arxiv.org/abs/1511.00013
Autor:
Strateva, Iskra V., Komossa, Stefanie
Publikováno v:
Astrophys.J.692:443-458,2009
We present 26 point-sources discovered with Chandra within 200" (~20kpc) of the center of the barred supergiant galaxy NGC 1365. The majority of these sources are high-mass X-ray binaries, containing a neutron star or a black hole accreting from a lu
Externí odkaz:
http://arxiv.org/abs/0810.3793
We study the 0.5-10keV emission of a sample of five of the broadest double-peaked Balmer-line emitters with Chandra. The Balmer lines of these objects originate close (within a few hundred gravitational radii) to the central black holes of the Active
Externí odkaz:
http://arxiv.org/abs/0808.0857
Publikováno v:
Astron.J.130:387-405,2005
Using a sample of 228 optically selected Active Galactic Nuclei (AGNs) in the 0.01-6.3 redshift range with a high fraction of X-ray detections (81-86%), we study the relation between rest-frame UV and soft X-ray emission and its evolution with cosmic
Externí odkaz:
http://arxiv.org/abs/astro-ph/0503009
Autor:
Hao, Lei, Strauss, Michael A., Fan, Xiaohui, Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., Kauffmann, Guinevere, Blanton, Michael R., Gunn, James E., Hall, Patrick B., Ivezić, Željko, Knapp, Gillian R., Krolik, Julian H., Lupton, Robert H., Richards, Gordon T., Schneider, Donald P., Strateva, Iskra V., Zakamska, Nadia L., Brinkmann, J., Brunner, Robert J., Szokoly, Gyula P.
Publikováno v:
Astron.J.129:1795-1808,2005
The emission line luminosity function of active galactic nuclei (AGN) is measured from about 3000 AGN included in the main galaxy sample of the Sloan Digital Sky Survey within a redshift range of $0
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501042
Autor:
Hao, Lei, Strauss, Michael A., Tremonti, Christy A., Schlegel, David J., Heckman, Timothy M., Kauffmann, Guinevere, Blanton, Michael R., Fan, Xiaohui, Gunn, James E., Hall, Patrick B., Ivezić, Željko, Knapp, Gillian R., Krolik, Julian H., Lupton, Robert H., Richards, Gordon T., Schneider, Donald P., Strateva, Iskra V., Zakamska, Nadia L., Brinkmann, J., Brunner, Robert J., Szokoly, Gyula P.
We have compiled a large sample of low-redshift active galactic nuclei (AGN) identified via their emission line characteristics from the spectroscopic data of the Sloan Digital Sky Survey. Since emission lines are often contaminated by stellar absorp
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501059
Publikováno v:
Astron.J.126:1720,2003; Astron.J.130:1961,2005
We present a new sample of 116 double-peaked Balmer line Active Galactic Nuclei (AGN) selected from the Sloan Digital Sky Survey. Double-peaked emission lines are believed to originate in the accretion disks of AGN, a few hundred gravitational radii
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307357
Although accretion disks are a theoretically appealing model for the geometry and dynamics of the gas in the vicinity of black holes in Active Galactic Nuclei (AGN), there is little direct observational evidence for their existence. The telltale sign
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303279
Publikováno v:
Astron.J. 124 (2002) 646
A complete sample of $7.7\times 10^4$ galaxies with five-band imaging and spectroscopic redshifts from the Sloan Digital Sky Survey is used to determine the fraction of the optical luminosity density of the Local Universe (redshifts $0.02
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204436
Publikováno v:
Astron.J. 122 (2001) 1861-1874
We study the optical colors of 147,920 galaxies brighter than g* = 21, observed in five bands by the Sloan Digital Sky Survey (SDSS) over ~100 sq. deg. of high Galactic latitude sky along the Celestial Equator. The distribution of galaxies in the g*-
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107201