Results 71 to 80 of about 161,008 (274)

Neutral Gas Outflows and Inflows in Infrared-Faint Seyfert Galaxies

, 2009
Previous studies of the Na I D interstellar absorption line doublet have shown that galactic winds occur in most galaxies with high infrared luminosities.
Cooper, Crenshaw, Croom, Croston, Das, David S. N. Rupke, Davies, de Vaucouleurs, Deo, Feldmeier, Ferrarese, Garnett, Granato, Hannah B. Krug, Henriksen, Kennicutt, Krongold, Krongold, Larson, Malkan, Martin, Martini, Martini, Martini, Mathur, Monier, Mouri, Netzer, Padovani, Pogge, Rodríguez-Ardila, Ruiz, Ruiz, Rupke, Rupke, Rupke, Sato, Scannapieco, Schlesinger, Schwartz, Schweitzer, Shapley, Smith, Spitzer, Springob, Stoll, Struve, Sylvain Veilleux, Thacker, Tremonti, Tremonti, van de Ven, Wegner, Weiner, Woo   +54 more
core   +1 more source

Spectra of X-ray galaxies in filaments

Вісник Астрономічної школи, 2013
Large-scale structure of Universe consists of galaxy clusters connected by filaments. Single filaments can be detected at redshifts up to 0.15. The general characteriscis of X-ray spectra of Sloan Digital Sky Survey galaxies, that lies outside clusters ...
A. V Tugay
doaj   +1 more source

Relativistic reflection spectra of super-spinning black holes

European Physical Journal C: Particles and Fields, 2020
We construct a relativistic reflection model in a non-Kerr spacetime in which, depending on the value of the deformation parameter of the metric, there are black hole solutions with spin parameter $$|a_*| > 1$$ |a∗|>1 .
Biao Zhou, Ashutosh Tripathi, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Sourabh Nampalliwar, Menglei Zhou   +6 more
doaj   +1 more source

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

The Cosmic History of Black Hole Growth from Deep Multiwavelength Surveys

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
Significant progress has been made in the last few years on understanding how supermassive black holes form and grow. In this paper, we begin by reviewing the spectral signatures of active galactic nuclei (AGN) ranging from radio to hard X‐ray wavelengths.
Ezequiel Treister, C. Megan Urry, Francesca Civano   +2 more
wiley   +1 more source

IRAS observations of Seyfert galaxies [PDF]

The Astrophysical Journal, 1985
Infrared Astronomy Satellite measurements at 25, 60 and 100 microns were used to analyze the infrared properties of Seyfert galaxies from the Markarian and NGC Catalogs. One hundred and sixteen of 186 Seyfert galaxies were detected. About 50% of all Seyfert galaxies in the sample have 60 micron luminosities in excess of 10 to the 10th power solar ...
Miley, G. K., Neugebauer, G., Soifer, B. T.   +2 more
openaire   +4 more sources

A Radio Polarimetric Study to Disentangle AGN Activity and Star-Formation in Seyfert Galaxies [PDF]

, 2020
To understand the origin of radio emission in radio-quiet AGN and differentiate between the contributions from star formation, AGN accretion, and jets, we have observed a nearby sample of Seyfert galaxies along with a comparison sample of starburst galaxies using the EVLA in full-polarization mode in the B-array configuration. The radio morphologies of
arxiv   +1 more source

AGN Obscuration and the Unified Model

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
Unification Models of Active Galactic Nuclei postulate that all the observed differences between type 1 and type 2 objects are due to orientation effects with respect to the line of sight to the observer. The key ingredient of these models is the obscuring medium, historically envisaged as a toroidal structure on a parsec scale.
Stefano Bianchi, Roberto Maiolino, Guido Risaliti, Isabelle Gavignaud   +3 more
wiley   +1 more source

The Unified Model of Active Galactic Nuclei: II. Evolutionary Connection

, 2007
(Abbreviated) We assemble a sample composed of 243 nearby Seyfert galaxies with redshifts $z\le 0.05$ to test the unification scheme. The sample contains 94 BLS1s, 44 NLS1s, 36 X-ray absorbed HBLR S2s, 42 X-ray absorbed non-HBLR S2s and 27 X-ray ...
Antonucci R. R. J., Boller T., Collin S., de Grijp M. H. K., de Grijp M. H. K., En‐Peng Zhang, Grupe D., Grupe D., Jian‐Min Wang, Kollatschny W., Lipari S., Mineshige S., Prungniel Ph., Rao A. R., Silk J., Stirpe G. M., Veron M. P., Voit G. M., Winkler H., Young S.   +19 more
core   +1 more source

Stellar indices and kinematics in Seyfert 1 nuclei [PDF]

, 2000
We present spectra of 6 type 1 Seyfert galaxies, 2 Seyfert 2, a starburst galaxy and a compact narrow line radiogalaxy, taken in two spectral ranges centered around the near--IR CaII triplet (CaT) (at ~8600 Angstroms), and the Mgb stellar feature at 5180
Diaz, A. I., Jimenez-Benito, L., Terlevich, E., Terlevich, R.   +3 more
core   +3 more sources