Results 71 to 80 of about 1,391,040 (211)

Phylogenetic Analyses of Quasars and Galaxies [PDF]

, 2017
Phylogenetic approaches have proven to be useful in astrophysics. We have recently published a Maximum Parsimony (or cladistics) analysis on two samples of 215 and 85 low-z quasars (z < 0.7) which offer a satisfactory coverage of the Eigenvector 1 ...
Marziani, Paola, D'Onofrio Mauro (5292622), Fraix-Burnet Didier (5293738), Fraix-Burnet Didier, Marziani Paola, Didier Fraix-Burnet, d'Onofrio, Mauro, Mauro D'Onofrio, Paola Marziani, D'Onofrio Mauro, Marziani Paola (5290507), Fraix-Burnet, Didier   +11 more
core   +1 more source

Kinematics of H i and O vi Absorbers: Insights into the Turbulence Driver of the Multiphase Circumgalactic Medium

The Astrophysical Journal Letters
We investigate large-scale gas kinematics in the multiphase circumgalactic medium (CGM) using the observed correlation between line width (Doppler b parameter) and column density ( N ) for H i and O vi absorbers. Leveraging extensive public galaxy survey
Zhijie Qu, Hsiao-Wen Chen, Eliana Schiller, Jing Wang, Max Gronke   +4 more
doaj   +1 more source

Luminosity Function of Quasars at 1.0 < z < 3.5 from SDSS and DESI

The Astrophysical Journal
We present a study of the evolution of type 1 quasars at 1.0 
Gaocheng Yin, Linhua Jiang, Zhiwei Pan, Paul Martini, Wei-Jian Guo, Siwei Zou, Shengxiu Sun, Swayamtrupta Panda, Abhijeet Anand, Benjamin Alan Weaver, Aaron Meisner, Andrei Cuceu, Arjun Dey, Axel de la Macorra, Christophe Magneville, David Brooks, David Kirkby, David Schlegel, David Sprayberry, Davide Bianchi, Dick Joyce, Enrique Gaztañaga, Eusebio Sanchez, Francisco Javier Castander, Francisco Prada, Gaston Gutierrez, Graziano Rossi, Gregory Tarlé, Hiram K. Herrera-Alcantar, Hu Zou, Ignasi Pérez-Ràfols, Jaime E. Forero-Romero, Jessica Nicole Aguilar, John Moustakas, Joseph Harry Silber, Klaus Honscheid, Laurent Le Guillou, Marc Manera, Martin Landriau, Michael Schubnell, Mustapha Ishak, Nathalie Palanque-Delabrouille, Peter Doel, Ramon Miquel, Robert Kehoe, Satya Gontcho A Gontcho, Seshadri Nadathur, Simone Ferraro, Stephanie Juneau, Steven Ahlen, Theodore Kisner, Todd Claybaugh, Will Percival, Anthony Kremin, Claire Lamman, Claire Poppett, Rongpu Zhou   +56 more
doaj   +1 more source

Discovery of Merging Twin Quasars at z = 6.05

The Astrophysical Journal Letters
We report the discovery of two quasars at a redshift of z = 6.05 in the process of merging. They were serendipitously discovered from the deep multiband imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey.
Yoshiki Matsuoka, Takuma Izumi, Masafusa Onoue, Michael A. Strauss, Kazushi Iwasawa, Nobunari Kashikawa, Masayuki Akiyama, Kentaro Aoki, Junya Arita, Masatoshi Imanishi, Rikako Ishimoto, Toshihiro Kawaguchi, Kotaro Kohno, Chien-Hsiu Lee, Tohru Nagao, John D. Silverman, Yoshiki Toba   +16 more
doaj   +1 more source

JWST Confirms the Nature of CID-42

The Astrophysical Journal
The galaxy CID-42 (CXOC J100043.1+020637.2) at z = 0.359 has been proposed to contain a promising candidate for a gravitational-wave recoiling supermassive black hole (SMBH), a slingshot SMBH from a triple-SMBH interaction, or a kiloparsec-scale dual ...
Junyao Li, Ming-Yang Zhuang, Yue Shen
doaj   +1 more source

High-Redshift Quasars at z ≥ 3—III: Parsec-Scale Jet Properties from Very Long Baseline Interferometry Observations

Universe
High-redshift active galactic nuclei (AGN) provide key insights into early supermassive black hole growth and cosmic evolution. This study investigates the parsec-scale properties of 86 radio-loud quasars at z ≥ 3 using very long baseline interferometry (
Shaoguang Guo, Tao An, Yuanqi Liu, Chuanzeng Liu, Zhijun Xu, Yulia Sotnikova, Timur Mufakharov, Ailing Wang   +7 more
doaj   +1 more source

Double Dragon Chinese Kitchen

, 1991
Chines
Double Dragon Chinese Kitchen
core  

EW [OIII] as an orientation indicator [PDF]

, 2017
We present an analysis of the average spectral properties of 12,000 SDSS quasars as a function of accretion disk inclination, as measured from the equivalent width of the [O III] 5007Å line. The use of this indicator on a large sample of quasars from the
RISALITI, Guido, LUSSO, ELISABETA, Marconi, Alessandro, Bisogni, Susanna   +3 more
core   +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 Influence of Microlensing on Time Delay Determinations in Double‐imaged Quasars

The Astrophysical Journal, 1998
The lag associated with the main peak of the cross-correlation function of the two light curves arriving from a double-imaged quasar is usually identified with the time delay between the components. However, short-timescale microlensing events can independently modify the light curve of each component, and when strong microlensing is present, the ...
Luis Julian Goicoechea, Alejandro Oscoz, Evencio Mediavilla, Jesus Buitrago, Miquel Serra‐Ricart   +4 more
openaire   +1 more source