Results 51 to 60 of about 18,958 (240)

An HST/WFPC2 Snapshot Survey of 2MASS-Selected Red QSOs [PDF]

, 2003
Using simple infrared color selection, 2MASS has found a large number of red, previously unidentified, radio-quiet QSOs. Although missed by UV/optical surveys, the 2MASS QSOs have K-band luminosities that are comparable to "classical" QSOs. This suggests
Andrew R. Marble, Antonucci R., Boyle B. J., Brant O. Nelson, Comastri A., Dean C. Hines, Dunlop J. S., Gary D. Schmidt, Holmberg E. B., Jason A. Surace, Lee Armus, Paul S. Smith, Roc M. Cutri   +12 more
core   +2 more sources

X-ray absorbed QSOs and the QSO evolutionary sequence

, 2006
Peer ...
Page, Matt, Carrera, Francisco J., Ebrero, Jacobo, Stevens, J. A., Ivison, R. J.   +4 more
openaire   +3 more sources

Public good agreements under the weakest‐link technology

Journal of Public Economic Theory, Volume 22, Issue 3, Page 555-582, June 2020., 2020
Abstract We analyze the formation of public good agreements under the weakest‐link technology. Whereas policy coordination is not necessary for symmetric players, it matters for asymmetric players; however, this fails in the absence of transfers. By contrast, with a transfer scheme, asymmetry may be an asset for cooperation.
Alejandro Caparrós, Michael Finus
wiley   +1 more source

A Highly Magnified Gravitationally Lensed Red QSO at z = 2.5 with a Significant Flux Ratio Anomaly

The Astrophysical Journal, 2023
We present the discovery of a gravitationally lensed dust-reddened QSO at z = 2.517, identified in a survey for QSOs by infrared selection. Hubble Space Telescope imaging reveals a quadruply lensed system in a cusp configuration, with a maximum image ...
Eilat Glikman, Cristian E. Rusu, Geoff C.-F. Chen, James Hung-Hsu Chan, Cristiana Spingola, Hannah Stacey, John McKean, Ciprian T. Berghea, S. G. Djorgovski, Matthew J. Graham, Daniel Stern, Tanya Urrutia, Mark Lacy, Nathan J. Secrest, John M. O’Meara   +14 more
doaj   +1 more source

A study of [O III]/[O II] lines ratio in type 1 active galactic nucleus: Influence of radio jets and Eddington ratio to narrow line region emission

Astronomische Nachrichten, Volume 341, Issue 3, Page 300-313, March 2020., 2020
Abstract We analyze emission line properties and their correlations for 18,043 type 1 active galactic nucleus (AGN) in the range of 0.02 ≤ z ≤ 0.8, based on Sloan Digital Sky Survey Data Release 14 data. We complement the data with photometric measurements from ROSAT, GALEX, 2MASS, and FIRST.
Irham Taufik Andika, Mochamad Ikbal Arifyanto, Wolfram Kollatschny   +2 more
wiley   +1 more source

Neural-network selection of high-redshift radio quasars, and the luminosity function at z~4 [PDF]

, 2015
We obtain a sample of 87 radio-loud QSOs in the redshift range 3 ...
Benn, C. R., Gonzalez-Serrano, J. I., Tuccillo, D.   +2 more
core   +2 more sources

The multiwavelength properties of red QSOs: Evidence for dusty winds as the origin of QSO reddening [PDF]

Astronomy & Astrophysics, 2021
Fundamental differences in the radio properties of red quasars (QSOs), as compared to blue QSOs, have been recently discovered, positioning them as a potential key population in the evolution of galaxies and black holes across cosmic time. To elucidate the nature of these objects, we exploited a rich compilation of broad-band photometry and ...
T. Costa, Suvendu Rakshit, Suvendu Rakshit, Rebecca A. A. Bowler, R. Kondapally, Philip Best, Leah K. Morabito, David J. Rosario, Matteo Bonato, David M. Alexander, Christopher Harrison, Marko Stalevski, L. Klindt, V. A. Fawcett, G. Calistro Rivera   +14 more
openaire   +8 more sources

Extreme Galactic-Winds and Starburst in IR Mergers and IR QSOs [PDF]

, 2000
We report -as a part of a long-term study of mergers and IR QSOs- detailed spectroscopic evidences for outflow (OF) and/or Wolf Rayet features in: (i) low velocity OF in the ongoing mergers NGC 4038/39 and IRAS 23128-5919; (ii) extreme velocity OF (EVOF)
Carranza, G., Diaz, R., Dottori, H., Kim, D., Lipari, S., Sanders, D., Taniguchi, Y., Terlevich, R., Tsvetanov, Z., Veilleux, S., Zheng, W.   +10 more
core   +2 more sources

Reducing the Uncertainty on the Hubble Constant up to 35% with an Improved Statistical Analysis: Different Best-fit Likelihoods for Type Ia Supernovae, Baryon Acoustic Oscillations, Quasars, and Gamma-Ray Bursts

The Astrophysical Journal, 2023
Cosmological models and their parameters are widely debated, especially about whether the current discrepancy between the values of the Hubble constant, H _0 , obtained by Type Ia supernovae (SNe Ia) and the Planck data from the cosmic microwave ...
Maria Giovanna Dainotti, Giada Bargiacchi, Malgorzata Bogdan, Aleksander Lukasz Lenart, Kazunari Iwasaki, Salvatore Capozziello, Bing Zhang, Nissim Fraija   +7 more
doaj   +1 more source

The 2dF QSO Redshift Survey – IX. A measurement of the luminosity dependence of QSO clustering [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
7 pages, 9 figures.
Croom, S, Boyle, B, Loaring, N, Miller, L, Outram, P, Shanks, T, Smith, R   +6 more
openaire   +2 more sources