Results 101 to 110 of about 512 (214)

Strong and micro lensing in distant quasars

, 2023
Most large galaxies contain Super Massive Black Holes at their centers, drawing matter nearby to form swirling accretion disks emitting electromagnetic radiation. These are Active Galactic Nuclei.
Paic, Eric Gérard Guy
core   +1 more source

A Multiwavelength Study of ELAN Environments (AMUSE2): The Impact of Dense Environment on Massive Dusty Star-forming Galaxies at Cosmic Noon

The Astrophysical Journal
To understand how massive galaxies are influenced by their surroundings, we present new Atacama Large Millimeter/submillimeter Array and Northern Extended Millimeter Array observations as part of A Multiwavelength Study of Enormous Ly α Nebula (ELAN ...
Yu-Jan Wang, Chian-Chou Chen, Fabrizio Arrigoni Battaia, Roberto Decarli, Helmut Dannerbauer, Po-Feng Wu   +5 more
doaj   +1 more source

VaDAR: Varstrometry for Dual AGN Using Radio Interferometry

The Astrophysical Journal
Binary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes.
Emma Schwartzman, Tracy E. Clarke, Kristina Nyland, Nathan J. Secrest, Ryan W. Pfeifle, Henrique Schmitt, Shobita Satyapal, Barry Rothberg   +7 more
doaj   +1 more source

The unification of radio galaxies and quasars: implications of the radio sizes and number densities

, 1994
We examine the recent suggestion that the relative counts and median radio sizes of the moderately distant quasars and radio galaxies in the 3CR complete sample are inconsistent with the simple unification scheme, according to which radio galaxies appear
Mangalam, Arun V., Gopal-Krishna,, Kulkarni, V. K.   +2 more
core   +1 more source

Molecular gas in type 2 quasars at z ~ 0.2-0.3 [PDF]

, 2013
We present results of CO(1-0) spectroscopic observations of 10 Sloan Digital Sky Survey type 2 quasars (QSO2) at z ~ 0.2-0.3 observed with the 30-m IRAM radio telescope and the Australia Telescope Compact Array.
Colina, L., Rodríguez, M., Graciá Carpio, J., Pérez Torres, M., Drouart, Guillaume, Humphrey, A., Humphrey, Andrew, Villar Martín, Montserrat, García-Burillo, S., Colina, Luis, Drouart, G., Graciá-Carpio, J., Planesas, P., Arribas, S., Arribas-Mocoroa, Santiago, García Burillo, S., Villar-Martín, M., Emonts, B.   +17 more
core   +1 more source

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +1 more source

A range of time delays for the double quasar 0957 + 561 A, B

The Astrophysical Journal, 1980
We have extended the complex formalism of Bourassa and Kantowski for a transparent gravitational lens to a multilens situation. By using a grid of assumed positions for the cluster center within its measured error box, we have then calculated a range of possible time delays between the two images, A and B. The results indicate a range from 0.03 yr to 1.
C. C. Dyer, R. C. Roeder
openaire   +1 more source

Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. I. The Hβ Broad-line Region Structure and Black Hole Masses of Five Quasars

The Astrophysical Journal
We conduct a reverberation mapping (RM) campaign to spectroscopically monitor a sample of selected bright active galactic nuclei with large anticipated broad-line region (BLR) sizes adequate for spectroastrometric (SA) observations by the GRAVITY ...
Yan-Rong Li, Chen Hu, Zhu-Heng Yao, Yong-Jie Chen, Hua-Rui Bai, Sen Yang, Pu Du, Feng-Na Fang, Yi-Xin Fu, Jun-Rong Liu, Yue-Chang Peng, Yu-Yang Songsheng, Yi-Lin Wang, Ming Xiao, Shuo Zhai, Hartmut Winkler, Jin-Ming Bai, Luis C. Ho, Romain G. Petrov, Jesús Aceituno, Jian-Min Wang, SARM Collaboration   +21 more
doaj   +1 more source

Varstrometry for Dual Active Galactic Nuclei Using Radio Interferometry: VaDAR with the VLBA

The Astrophysical Journal
Multiple active galactic nuclei (multi-AGN) are a known result of galaxy mergers. Therefore, they are an important tool for studying the formation and dynamical evolution of galaxies and supermassive black holes. A novel method for the selection of multi-
Emma Schwartzman, Paula Fudolig, Tracy E. Clarke, Kristina Nyland, Nathan J. Secrest, Ryan W. Pfeifle, Henrique Schmitt, Shobita Satyapal, Barry Rothberg   +8 more
doaj   +1 more source

Spectroscopic identification of type 2 quasars at z < 1 in SDSS-III/BOSS

, 2016
The physics and demographics of type 2 quasars remain poorly understood, and new samples of such objects selected in a variety of ways can give insight into their physical properties, evolution, and relationship to their host galaxies.
Yuan, Sihan, Strauss, Michael A, Zakamska, Nadia L   +2 more
core   +1 more source