Results 121 to 130 of about 111,241 (293)

Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$ [PDF]

, 2017
We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation of quasars with the Lyα-forest flux transmission at a mean redshift of z = 2.40.
Hélion Marie du Mas des Bourboux, J. Goff, M. Blomqvist, N. Busca, J. Guy, J. Rich, C. Yéche, J. Bautista, 'Etienne Burtin, K. Dawson, D. Eisenstein, A. Font-Ribera, D. Kirkby, J. Miralda-Escud'e, P. Noterdaeme, I. Pâris, P. Petitjean, I. P'erez-Rafols, M. Pieri, N. Ross, D. Schlegel, D. Schneider, A. Slosar, D. Weinberg, P. Zarrouk   +24 more
semanticscholar   +1 more source

Is there a disc in the superluminal quasars? [PDF]

Monthly Notices of the Royal Astronomical Society, 2003
We present a new evidence of the accretion disc in active galactic nuclei, by examining the properties of the Ha emission line versus viewing angle, in a sample of superluminal (SL) quasars. Both line velocity width (FWHM) and rest equivalent width (EW) correlate with viewing angle.
E. Rokaki, E. Rokaki, E. Rokaki, F. Economou, Andy Lawrence, Andy Lawrence, Apostolos Mastichiadis   +6 more
openaire   +3 more sources

The Color Variability of Quasars

, 2011
We quantify quasar color-variability using an unprecedented variability database - ugriz photometry of 9093 quasars from SDSS Stripe 82, observed over 8 years at ~60 epochs each. We confirm previous reports that quasars become bluer when brightening.
Abell, Atlee, Bauer, Bhatti, Bonning, Bovy, Butler, Chelouche, Choloniewski, Collier, Cristiani, Dan Maoz, David W. Hogg, Davis, De Rosa, Eyer, Geha, Gunn, Hans-Walter Rix, Hogg, Hook, Hopkins, Ivezic, Ivezic, Jo Bovy, Joseph C. Shields, Kasper B. Schmidt, Kaspi, Kaspi, Kaspi, Kawaguchi, Kelly, Kim, Kozlowski, MacLeod, MacLeod, Matthias Knecht, Pereyra, Peterson, Peterson, Rasmussen, Rengstorf, Richards, Richards, Richards, Richards, Riechers, Riechers, Ross, Sakata, Sakata, Schmidt, Scholz, Scranton, Sesar, Sesar, Shakura, Shen, Shen, Shen, Stoughton, Suganuma, Trevese, Trevese, Vanden Berk, Vanden Berk, Vestergaard, Webb, Wilhite, Winkler, Wu, Xia, Yun   +72 more
core   +1 more source

MEASURING THE TIME DELAYS IN GRAVITATIONALLY LENSED QUASARS IN THE PRESENCE OF MICROLENSING

Radio Physics and Radio Astronomy, 2014
A method to measure the time delays in gravitationally lensed quasars is proposed, which provides a simple and transparent procedure to eliminate the effects of microlensing events.
V. S. Tsvetkova, V. M. Shulga, L. A. Berdina   +2 more
doaj   +1 more source

EIGER. III. JWST/NIRCam Observations of the Ultraluminous High-redshift Quasar J0100+2802

The Astrophysical Journal, 2023
We present the first rest-frame optical spectrum of a high-redshift quasar observed with JWST/NIRCam in Wide Field Slitless mode. The observed quasar, J0100+2802, is the most luminous quasar known at z > 6. We measure the mass of the central supermassive
Anna-Christina Eilers, Robert A. Simcoe, Minghao Yue, Ruari Mackenzie, Jorryt Matthee, Dominika Ďurovčíková, Daichi Kashino, Rongmon Bordoloi, Simon J. Lilly   +8 more
doaj   +1 more source

Comment on "Biases in the Quasar Mass-Luminosity Plane" [PDF]

, 2010
Comment on "Biases in the Quasar Mass-Luminosity Plane"Comment: Comment on Biases in the Quasar Mass-Luminosity Plane; 3 ...
Elvis, Martin, Steinhardt, Charles
core  

The Extremely Luminous Quasar Survey in the Pan-STARRS 1 Footprint (PS-ELQS) [PDF]

, 2019
We present the results of the Extremely Luminous Quasar Survey in the $3\pi$ survey of the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS; PS1).
Fan, Xiaohui, Hall, Patrick B., Huang, Yun-Hsin, Hughes, Allison, Litke, Katrina C., Rees, Jon M., Schindler, Jan-Torge, Wenzl, Lukas, Yang, Jinyi, Yue, Minghao   +9 more
core   +2 more sources

An overview on the quasar redshifts

Revista Técnica de la Facultad de Ingeniería, 2011
An overview of the foundations of modem cosmology a well as the controversies about physical association between high-red shift quasi-stellar objects and low-red shift galaxies are presented. This kind of evidence challenges the current velocity-distance
Williams Pitter, Zoraida Morantes, Antonio Aguillón, Romer Urdaneta, Angel Ochoa   +4 more
doaj  

A Southern Photometric Quasar Catalog from the Dark Energy Survey Data Release 2

The Astrophysical Journal Supplement Series, 2022
We present a catalog of 1.4 million photometrically selected quasar candidates in the southern hemisphere over the ∼5000 deg ^2 Dark Energy Survey (DES) wide survey area. We combine optical photometry from the DES second data release (DR2) with available
Qian Yang, Yue Shen
doaj   +1 more source

WITNESSING THE BIRTH OF A QUASAR [PDF]

The Astronomical Journal, 2010
27 pages, 5 figures. Updated references.
Takamitsu Tanaka, Zoltan Haiman, Kristen Menou   +2 more
openaire   +2 more sources