Results 131 to 140 of about 20,094 (246)

Possible arcminute-separation gravitational lensed QSOs in the 2dF QSO survey

, 2002
Revised version accepted for publication in ...
Miller, L, Lopes, A, Smith, R, Croom, S, Boyle, B, Shanks, T, Outram, P   +6 more
openaire   +2 more sources

Quantum Particle Swarm With Teamwork Evolutionary Strategy for Multi-Objective Optimization on Electro-Optical Platform

IEEE Access, 2019
This paper deals with multi-objective optimization design of the airborne electro-optical platform to reduce its mechanical resonance, improve its stability and reduce its mass.
Guoqiang Liu, Weiyi Chen, Huadong Chen
doaj   +1 more source

The WISSH Quasars Project III. X-ray properties of hyper-luminous quasars

, 2017
We perform a survey of the X-ray properties of 41 objects from the WISE/SDSS selected Hyper-luminous (WISSH) quasars sample, composed by 86 broad-line quasars (QSOs) with bolometric luminosity $L_{Bol}\geq 2\times 10^{47}\,erg\, s^{-1}$, at z~2-4.
Bianchi, S., Bischetti, M., Bongiorno, A., Bruni, G., Brusa, M., Duras, F., Fiore, F., Lanzuisi, G., Marconi, A., Martocchia, S., Mathur, S., Miniutti, G., Nicastro, F., Piconcelli, E., Vietri, G., Vignali, C., Zappacosta, L.   +16 more
core   +1 more source

The Detection of Two Distinct High Ionization States in a QSO Lyman-Limit Absorption System: Evidence for Hierarchical Galaxy Formation at [CLC][ITAL]z[/ITAL][/CLC] ∼ 3? [PDF]

, 1999
David Kirkman, David Tytler
openalex   +1 more source

The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function

, 2000
Accepted for publication in MNRAS.
Boyle, B, Shanks, T, Croom, S, Smith, R, Miller, L, Loaring, N, Heymans, C   +6 more
openaire   +3 more sources

Radio spectra and polarisation properties of radio-loud Broad Absorption Line Quasars

, 2008
We present multi-frequency observations of a sample of 15 radio-emitting Broad Absorption Line Quasars (BAL QSOs), covering a spectral range between 74 MHz and 43 GHz. They display mostly convex radio spectra which typically peak at about 1-5 GHz (in the
Aller, Baars, Becker, Becker, Becker, Benn, C. R. Benn, Cohen, Condon, Cotton, Dai, Dallacasa, De Vries, Djorgovski, Douglas, Elvis, F. Jiménez-Luján, F. M. Montenegro-Montes, Fanti, Fanti, Fanti, Fanti, Ficarra, Ganguly, Ganguly, Ghosh, Gregg, Gregg, Gregorini, Hall, Hamann, Henstock, Hewett, Holt, Holt, Hopkins, J. Holt, J. I. González-Serrano, Jiang, K.-H. Mack, Klein, Kunert-Bajraszewska, Lahulla, M. Vigotti, Mack, Menou, Miley, O'Dea, O'Dea, Orienti, Orr, Osmer, Perley, R. Carballo, Reichard, Reichard, Rengelink, Saikia, Schlegel, Schneider, Schneider, Simard-Normandin, Snellen, Stanghellini, Stanghellini, Stickel, Stocke, Tabara, Torniainen, Torniainen, Trump, Vigotti, Vigotti, Vigotti, Weymann, White, Wielebinski, Zhou   +77 more
core   +1 more source

The broad-band X-ray spectrum of a QSO sample [PDF]

, 1984
A sample of 25 QSOs was used to investigate the average spectrum between the soft X-ray energy band of the Einstein Observatory image proportional counter, and the higher energy band of the HEAO 1 A2 experiment.
Marshall, F. E., Worrall, D. M.
core   +1 more source

Molecular Gas in Infrared Ultraluminous QSO Hosts

, 2012
We report CO detections in 17 out of 19 infrared ultraluminous QSO (IR QSO) hosts observed with the IRAM 30m telescope. The cold molecular gas reservoir in these objects is in a range of 0.2--2.1$\times 10^{10}M_\odot$ (adopting a CO-to-${\rm H_2 ...
A. Omont, Alexander, Alexander, Aravena, B. O. Flaquer, Beelen, Bonfield, Bradford, C.-N. Hao, Canalizo, Chung, Coppin, Daddi, Dasyra, Dasyra, De Rosa, Diamond-Stanic, Dinh-V-Trung, Downes, Evans, Evans, Evans, Fan, Ferrarese, Gao, Gao, Garay, Hao, Hao, Hopkins, Houck, Häring, Kim, Lutz, Magorrian, Matthews, Mirabel, Netzer, P. Cox, Q. H. Tan, Riechers, Riechers, Riechers, Riechers, Riechers, Riechers, S. Leon, S. Mao, Schinnerer, Schweitzer, Scoville, Solomon, Staguhn, Tacconi, Tacconi, Tremaine, Vestergaard, Wang, X. Y. Xia, Y. Gao, Yun, Zheng   +61 more
core   +3 more sources

N2841-UB3 - A QSO with unusually strong optical Fe II emission [PDF]

, 1990
J. W. Sulentic, Wei Zheng, Halton Arp
openalex   +1 more source

A Study on the Line of Sight to Galaxies Detected at Gamma-Ray Energies

The Astrophysical Journal Letters
The large-scale universal structure comprises strands of dark matter and galaxies with large underdense volumes known as voids. We measure the fraction of the line of sight that intersects voids for active galactic nuclei (AGN) detected by Fermi Large ...
Amy Furniss, Josepf N. Amador, Olivier Hervet, Ollie Jackson, David A. Williams   +4 more
doaj   +1 more source