Results 101 to 110 of about 719 (181)

Clues from microquasars to the origin of radio-loudness of quasars [PDF]

, 2007
Carlo Nipoti, Katherine M. Blundell, James Binney   +2 more
openalex   +1 more source

B2 1308+326: A Changing-look Blazar or Not?

The Astrophysical Journal
In our previous study, we identified a shift in the synchrotron peak frequency of the blazar B2 1308+326 from 10 ^12.9 to 10 ^14.8 Hz during a flare, suggesting it could be a changing-look blazar (CLB).
Ashwani Pandey, Chen Hu, Jian-Min Wang, Bożena Czerny, Yong-Jie Chen, Yu-Yang Songsheng, Yi-Lin Wang, Hao Zhang, Jesús Aceituno   +8 more
doaj   +1 more source

Probing the nature of black holes: Deep in the mHz gravitational-wave sky. [PDF]

Exp Astron (Dordr), 2021
Baibhav V, Barack L, Berti E, Bonga B, Brito R, Cardoso V, Compère G, Das S, Doneva D, Garcia-Bellido J, Heisenberg L, Hughes SA, Isi M, Jani K, Kavanagh C, Lukes-Gerakopoulos G, Mueller G, Pani P, Petiteau A, Rajendran S, Sotiriou TP, Stergioulas N, Taylor A, Vagenas E, van de Meent M, Warburton N, Wardell B, Witzany V, Zimmerman A.   +28 more
europepmc   +1 more source

Photometric Selection of Type 1 Quasars in the XMM-LSS Field with Machine Learning and the Disk–Corona Connection

The Astrophysical Journal
We present photometric selection of type 1 quasars in the ≈5.3 deg ^2 XMM-Large Scale Structure survey field with machine learning. We constructed our training and blind-test samples using spectroscopically identified Sloan Digital Sky Survey quasars ...
Jian Huang, Bin Luo, W. N. Brandt, Ying Chen, Qingling Ni, Yongquan Xue, Zijian Zhang   +6 more
doaj   +1 more source

Evolving parsec-scale radio structure in the most distant blazar known. [PDF]

Nat Commun, 2020
An T, Mohan P, Zhang Y, Frey S, Yang J, Gabányi KÉ, Gurvits LI, Paragi Z, Perger K, Zheng Z.   +9 more
europepmc   +1 more source

The HST Sample of Radio-Loud Quasars: Emission Lines from Lyα to Hβ [PDF]

, 1997
Beverley J. Wills, M. S. Brotherton, D. Wills, K. Thompson, J. A. Baldwin, R. F. Carswell, I. W. A. Browne, H. Netzer, Paul Francis   +8 more
openalex   +1 more source

The unusual near-infrared morphology of the radio-loud quasar 4C + 09.17 [PDF]

, 1997
L. Annus, G. Neugebauer, M. D. Lehnert, K. Matthews   +3 more
openalex   +1 more source

Milliarcsecond-resolution Radio-imaging Survey of Blazar Candidates at 4 < z < 5.4

The Astrophysical Journal Supplement Series
We present a milliarcsecond-resolution radio survey of 17 high-redshift (4 ≤ z ≤ 5.4) blazar candidates observed with the European Very Long Baseline Interferometry (VLBI) Network at 5 GHz.
Máté Krezinger, Alessandro Caccianiga, Daniele Dallacasa, Luca Ighina, Sándor Frey, Alberto Moretti, Sonia Antón, Silvia Belladitta, Claudia Cicone, Krisztina É. Gabányi, M. J. M. Marchã, Krisztina Perger   +11 more
doaj   +1 more source

NuSTAR Observations of a Varying-flux Quasar in the Epoch of Reionization

The Astrophysical Journal Letters
With enough X-ray flux to be detected in a 160 s scan by SRG/eROSITA, the z = 6.19 quasar CFHQS J142952+544717 is, by far, the most luminous X-ray source known at z  > 6.
Lea Marcotulli, Thomas Connor, Eduardo Bañados, Peter G. Boorman, Giulia Migliori, Brian W. Grefenstette, Emmanuel Momjian, Aneta Siemiginowska, Daniel Stern, Silvia Belladitta, C. C. Cheung, Andrew Fabian, Yana Khusanova, Chiara Mazzucchelli, Sofía Rojas-Ruiz, C. Megan Urry   +15 more
doaj   +1 more source

Discovery of az= 6.1 Radio‐Loud Quasar in the NOAO Deep Wide Field Survey [PDF]

, 2006
Ian D. McGreer, R. H. Becker, D. J. Helfand, R. L. White   +3 more
openalex   +1 more source