Results 121 to 130 of about 10,418 (177)

Electromagnetic counterparts to massive black-hole mergers. [PDF]

Living Rev Relativ, 2022
Bogdanović T, Miller MC, Blecha L.
europepmc   +1 more source

The Two-component Circumgalactic Medium Emission around z ∼ 2 Radio-loud Quasars

The Astrophysical Journal
We present Ly α , He ii , and C iv observations of seven z ∼ 2 radio-loud quasars observed using the Keck Cosmic Web Imager and compare it to observed radio jet emission using archival Very Large Array and Atacama Large Millimeter/submillimeter Array ...
Sanchit Sabhlok, Shelley A. Wright, Andrey Vayner, Norman Murray, Lee Armus, Maren Cosens, James Wiley, Eileen Meyer, Karthik Reddy, Marie Wingyee Lau   +9 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

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

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

J-HERTz: J-PLUS Heritage Exploration of Radio Targets at z < 5

The Astrophysical Journal Supplement Series
We introduce J-HERTz (J-PLUS Heritage Exploration of Radio Targets at z < 5), a new multiwavelength catalog that combines optical narrowband photometry from J-PLUS, infrared observations from the Wide-field Infrared Survey Explorer, and deep low ...
D. Fernández Gil, J. A. Fernández-Ontiveros, C. López-Sanjuan, F. Arizo-Borillo, A. del Pino, A. Hernán-Caballero, A. Lumbreras-Calle, P. T. Rahna, David Sobral, H. Vázquez Ramió, A. J. Cenarro, A. Marín-Franch, R. E. Angulo, A. Ederoclite, D. Cristóbal-Hornillos, R. A. Dupke, C. Hernández-Monteagudo, M. Moles, L. Sodré Jr., J. Varela   +19 more
doaj   +1 more source

J1406+0102: A Dust-obscured Galaxy Hiding a Super-Eddington Accretion System with Bright Radio Emission

The Astrophysical Journal
Recent high- z quasar observations strongly indicate that super-Eddington accretion is a crucial phase to describe the presence of supermassive black holes (SMBHs) with M _BH  ≳ 10 ^9 M _⊙ at z  ≳ 7.
Hikaru Fukuchi, Kohei Ichikawa, Masayuki Akiyama, Shigeo S. Kimura, Yoshiki Toba, Kohei Inayoshi, Akatoki Noboriguchi, Toshihiro Kawaguchi, Xiaoyang Chen, Itsna K. Fitriana   +9 more
doaj   +1 more source