Results 121 to 130 of about 85,255 (272)

Galactic-scale Quasar Pairs from the Sloan Digital Sky Survey and Gaia DR3

The Astrophysical Journal
We perform a systematic search for galactic-scale quasar pairs and small-scale ( 10 ^44.5 erg s ^−1 ) at 0.5 
Yuanzhe Jiang, Yue Shen, Xin Liu, Nadia Zakamska, Ming-Yang Zhuang, Arran C. Gross, Junyao Li, Yu-Ching Chen, Yuzo Ishikawa   +8 more
doaj   +1 more source

Orientation and quasar black hole mass estimation [PDF]

, 2015
M. S. Brotherton, Vikram Singh, Jessie C. Runnoe   +2 more
openalex   +1 more source

Clustering of Ly-alpha emitters around luminous quasars at z = 2-3: an alternative probe of reionization on galaxy formation

, 2011
Narrowband observations have detected no Ly-alpha emission within a 70 pMpc^3 volume centered on the z = 2.168 quasar PKS 0424-131. This is in contrast to surveys of Ly-alpha emitters in the field at similar redshifts and flux limits, which indicate that
Babul, Barkana, Barkana, Barkana, Blanc, Bland-Hawthorn, Bland-Hawthorn, Bolton, Bouwens, Cantalupo, Cepa, Dayal, Dijkstra, Dijkstra, Dijkstra, Dijkstra, Efstathiou, Fan, Faucher-Giguère, Francis, Gawiser, Gnedin, Gronwall, Gunn, Hamana, Iliev, J. Stuart B. Wyithe, Jones, Joss Bland-Hawthorn, Kaiser, Kashikawa, Kennicutt, Kepner, Kitayama, Kitayama, Komatsu, Laursen, Loren R. Bruns, Marcelin, Mark Dijkstra, Miralda Escudé, Mo, Nilsson, Osterbrock, Ouchi, Overzier, Pirzkal, Press, Schaerer, Schirber, Shapley, Sharp, Shen, Sheth, Sokolowski, Taylor, Thoul, Veilleux, Venemans, Wyithe   +59 more
core   +1 more source

Towards an Understanding of Changing-Look Quasars: An Archival Spectroscopic Search in SDSS

, 2016
The uncertain origin of the recently-discovered `changing-looking' quasar phenomenon -- in which a luminous quasar dims significantly to a quiescent state in repeat spectroscopy over ~10 year timescales -- may present unexpected challenges to our ...
Anderson, Scott F., Blanton, Michael R., Cales, Sabrina L., Dwelly, Tom, Eracleous, Michael, Georgakakis, Antonis, Green, Paul J., Greene, Jenny E., LaMassa, Stephanie M., Merloni, Andrea, Morganson, Eric, Ruan, John J., Runnoe, Jessie C., Schneider, Donald P., Shen, Yue, Wilkinson, Tessa D.   +15 more
core   +2 more sources

The gravitational lens effect and the surface density of quasars near foreground galaxies [PDF]

, 1985
E. J. Zuiderwijk
openalex   +1 more source

Temperature Fluctuations in Quasar Accretion Discs from Spectroscopic Monitoring Data [PDF]

, 2022
Zachary Stone, Yue Shen
openalex   +1 more source

CatNorth: An Improved Gaia DR3 Quasar Candidate Catalog with Pan-STARRS1 and CatWISE

The Astrophysical Journal Supplement Series
A complete and pure sample of quasars with accurate redshifts is crucial for quasar studies and cosmology. In this paper, we present CatNorth, an improved Gaia Data Release 3 (Gaia DR3) quasar candidate catalog with more than 1.5 million sources in the 3
Yuming Fu, Xue-Bing Wu, Yifan Li, Yuxuan Pang, Ravi Joshi, Shuo Zhang, Qiyue Wang, Jing Yang, FanLam Ng, Xingjian Liu, Yu Qiu, Rui Zhu, Huimei Wang, Christian Wolf, Yanxia Zhang, Zhi-Ying Huo, Y. L. Ai, Qinchun Ma, Xiaotong Feng, R. J. Bouwens   +19 more
doaj   +1 more source

An Anomaly in the Angular Distribution of Quasar Magnitudes: Evidence\n for a Bubble Universe with a Mass ~10^21 M\\odot [PDF]

, 2012
M. J. Longo
openalex   +1 more source

A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity

, 2007
(Abridged) We develop a model for the cosmological role of mergers in the evolution of starbursts, quasars, and spheroidal galaxies. Combining halo mass functions (MFs) with empirical halo occupation models, we calculate where major galaxy-galaxy mergers
Athanassoula E., Bower R. G., Combes F., da Angela J., Dušan Kereš, Gao L., Kormendy J., Krivitsky D. S., Lars Hernquist, Li C., Lynden-Bell D., Mo H. J., Pfenniger D., Philip F. Hopkins, Richstone D., Salviander S., Saunders W., Shakura N. I., Soltan A., Thomas J. Cox, Weinmann S. M., White S. D. M.   +21 more
core   +1 more source

A Systematic Analysis of FeiiEmission in Quasars: Evidence for Inflow to the Central Black Hole [PDF]

, 2008
Hu Chen, Jian‐Min Wang, Luis C. Ho, Yan‐Mei Chen, Hao‐Tong Zhang, Wei‐Hao Bian, Suijian Xue   +6 more
openalex   +1 more source