Results 41 to 50 of about 113,643 (296)

EXTENDED SCATTERING ENVELOPE IN THE Q2237+0305 QUASAR

Radio Physics and Radio Astronomy, 2019
Purpose: Studying the accretion disc structure in the Q2237+0305 gravitationally lensed quasar in optical wavelengths; estimation of parameters of the matter accretion regime onto a central black hole.
L. A. Berdina, V. S. Tsvetkova, V. M. Shulga   +2 more
doaj   +1 more source

Confrontarsi con l’assenza

magazén, 2022
The city is a set of arbitrary visual experiences dispersed in time that must necessarily be integrated. In studying the absences, Bruno Toscano writes that “the city would appear to us in a less verisimilar facies if we resigned ourselves to consider
Farina, Arianna
doaj   +1 more source

Improved redshifts for SDSS quasar spectra [PDF]

, 2010
A systematic investigation of the relationship between different redshift estimation schemes for more than 91000 quasars in the Sloan Digital Sky Survey (SDSS) Data Release 6 (DR6) is presented.
Abazajian, Adelman-McCarthy, Adelman-McCarthy, Bajtlik, Baldwin, Becker, Boroson, Croom, Gaskell, Gibson, Heckman, Hewett, Kirkman, Nestor, Padmanabhan, Paul C. Hewett, Richards, Schneider, Schneider, Shen, Stoughton, Tonry, Tytler, Tytler, Vanden Berk, Vanden Berk, Vivienne Wild, Wild, Wild, Wild, York   +30 more
core   +3 more sources

The Faint End of the Quasar Luminosity Function at z ∼ 5 from the Subaru Hyper Suprime-Cam Survey [PDF]

Astrophysical Journal, 2020
We present the quasar luminosity function at z ∼ 5 derived from the optical wide-field survey data obtained as a part of the Subaru strategic program (SSP) with the Hyper Suprime-Cam (HSC).
M. Niida, T. Nagao, H. Ikeda, M. Akiyama, Y. Matsuoka, W. He, K. Matsuoka, Y. Toba, M. Onoue, Masakazu A. R. Kobayashi, Y. Taniguchi, H. Furusawa, Y. Harikane, M. Imanishi, N. Kashikawa, T. Kawaguchi, Y. Komiyama, H. Shirakata, Y. Terashima, Y. Ueda   +19 more
semanticscholar   +1 more source

Preliminary Target Selection for the DESI Quasar (QSO) Sample [PDF]

Research Notes of the AAS, 2020
The DESI survey will measure large-scale structure using quasars as direct tracers of dark matter in the redshift range 0.9 < z < 2.1 and using quasar Lyα forests at z > 2.1. We present two methods to select candidate quasars for DESI based on imaging in
C. Yéche, N. Palanque-Delabrouille, C. Claveau, D. Brooks, E. Chaussidon, T. Davis, K. Dawson, A. Dey, Y. Duan, S. Eftekharzadeh, D. Eisenstein, E. Gaztañaga, R. Kehoe, M. Landriau, D. Lang, M. Levi, A. Meisner, A. Myers, J. Newman, C. Poppett, F. Prada, A. Raichoor, D. Schlegel, M. Schubnell, R. Staten, G. Tarlé, R. Zhou   +26 more
semanticscholar   +1 more source

Autosomal Dominant Leukodystrophy: A Disease of the Nuclear Lamina

Frontiers in Cell and Developmental Biology, 2019
The nuclear lamina is a fibrous meshwork of proteins found adjacent to the inner nuclear membrane that plays a critical role in the maintenance of nuclear architecture.
Quasar S. Padiath
doaj   +1 more source

Circum-Galactic Medium in the Halo of Quasars

Frontiers in Astronomy and Space Sciences, 2017
The properties of circum-galactic gas in the halo of quasar host galaxies are investigated analyzing Mg II 2800 and C IV 1540 absorption-line systems along the line of sight close to quasars.
Riccardo Ottolina, Renato Falomo, Aldo Treves, Michela Uslenghi, Jari K. Kotilainen, Riccardo Scarpa, Emanuele Paolo Farina   +6 more
doaj   +1 more source

The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release [PDF]

, 2017
OCEVU Labex by the "Investissements d'Avenir" French government [ANR-11-LABX-0060]; A*MIDEX project by the "Investissements d'Avenir" French government [ANR-11-IDEX-0001-02]; Agence Nationale de la Recherche [ANR-16-CE31-0021]; Leverhulme Trust Early ...
I. Pâris, P. Petitjean, E. Aubourg, A. Myers, A. Streblyanska, B. Lyke, F. Scott, Anderson, E. Armengaud, J. Bautista, M. Blanton, M. Blomqvist, J. Brinkmann, J. Brownstein, W. Brandt, É. Burtin, K. Dawson, S. D. Torre, Antonis, Georgakakis, H. Gil-Marín, P. Green, P. Hall, J. Kneib, S. LaMassa, J. L. Go, C. MacLeod, V. Mariappan, I. McGreer, A. Merloni, Pasquier, Noterdaeme, N. Palanque-Delabrouille, W. Percival, A. Ross, G. Rossi, P. Donald, Schneider, H. Seo, R. Tojeiro, B. Weaver, A. Weijmans, C. Yéche, P. Zarrouk, Gong-Bo Zhao   +44 more
semanticscholar   +1 more source

Discovery of the First Low-luminosity Quasar at z > 7 [PDF]

Astrophysical Journal, 2019
We report the discovery of a quasar at z = 7.07, which was selected from the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey.
Y. Matsuoka, M. Onoue, N. Kashikawa, M. Strauss, K. Iwasawa, Chien-Hsiu Lee, M. Imanishi, T. Nagao, M. Akiyama, N. Asami, J. Bosch, H. Furusawa, T. Goto, J. Gunn, Y. Harikane, H. Ikeda, T. Izumi, T. Kawaguchi, N. Kato, S. Kikuta, K. Kohno, Y. Komiyama, S. Koyama, R. Lupton, T. Minezaki, S. Miyazaki, H. Murayama, M. Niida, A. Nishizawa, Akatoki Noboriguchi, M. Oguri, Y. Ono, M. Ouchi, P. Price, H. Sameshima, A. Schulze, H. Shirakata, J. Silverman, N. Sugiyama, Philip J. Tait, M. Takada, T. Takata, Masayuki Tanaka, Ji-Jia Tang, Y. Toba, Y. Utsumi, Shiang‐Yu Wang, T. Yamashita   +47 more
semanticscholar   +1 more source

Quasars [PDF]

Symposium - International Astronomical Union, 1994
I review recent results for quasars and discuss how they are related to activity in galaxies. Topics included are studies of quasar host galaxies with HST; searches for quasars in the Hubble Deep Field; evolution of the quasar luminosity function; news highlights from astro-ph; and current observational research problems and their relation to ...
openaire   +2 more sources