Results 121 to 130 of about 8,662 (194)

Physics from Time Variability of the VHE Blazar PKS 2155-304 [PDF]

, 2010
Blazars are the principal extragalactic sources of very high energy gamma-ray emission in the Universe. These objects constitute a sub-class of Active Galactic Nuclei whose emission is dominated by Doppler boosted non-thermal radiation from plasma ...
BARRES-DE-ALMEIDA, ULISSES
core  

A toy model for the X-ray spectral variability of active galactic nuclei [PDF]

, 2014
Investigations into the long-term X-ray spectral variability of 10 active galactic nuclei (AGNs) revealed a positive spectral index-flux correlation for each object.
Cao, Xinwu, Wang, Jun-Xian
core  

BASS. XLVII. 22 GHz Radio Atlas of Swift-BAT Selected AGN

The Astrophysical Journal
We present the third phase of the largest high-frequency, high-resolution imaging survey of 231 nearby, hard X-ray selected active galactic nuclei (AGNs), with a very high 98% ± 1% detection fraction.
Macon Magno, Krista L. Smith, O. Ivy Wong, Richard Mushotzky, Stuart Vogel, Michael J. Koss, Claudio Ricci, Kyuseok Oh, Chin-Shin Chang, Loreto Barcos-Muñoz, Franz E. Bauer, Alessandro Peca, Darshan Kakkad, Turgay Caglar, Benny Trakhtenbrot, Fiona Harrison, Daniel Stern, C. Megan Urry, Merry Powell   +18 more
doaj   +1 more source

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +1 more source

Extragalactic Science with the Orbiting Astronomical Satellite Investigating Stellar Systems (OASIS) Observatory. [PDF]

Space Sci Rev, 2023
Aalto S, Battersby C, Chin G, Hunt LK, Rigopoulou D, Stark AA, Viti S, Walker CK.   +7 more
europepmc   +1 more source

Strong long-term variability in active galactic nuclei affects virial black hole mass measurements. [PDF]

Nat Commun
Amrutha N, Wolf C, Onken CA, Hon WJ, Lai S, Raithel D, Tan AHT, Webster R.   +7 more
europepmc   +1 more source

Possible nonstellar explanation for the unexpected brightness of the earliest galaxies observed by the James Webb Space Telescope. [PDF]

Sci Rep
Jacak JE.
europepmc   +1 more source

The diffuse gamma-ray flux from clusters of galaxies. [PDF]

Nat Commun, 2023
Hussain S, Alves Batista R, de Gouveia Dal Pino EM, Dolag K.   +3 more
europepmc   +1 more source

A direct black-hole mass measurement in a little red dot at high redshift. [PDF]

Nature
Juodžbalis I, Marconcini C, D'Eugenio F, Maiolino R, Marconi A, Übler H, Scholtz J, Ji X, Jones GC, Perna M, Arribas S, Bennett JS, Bromm V, Bunker AJ, Carniani S, Charlot S, Cresci G, Dayal P, Egami E, Fabian A, Inayoshi K, Isobe Y, Ivey LR, Koudmani S, Laporte N, Liu B, Lyu J, Mazzolari G, Monty S, Parlanti E, Pérez-González PG, Robertson B, Schneider R, Sijacki D, Tacchella S, Trinca A, Valiante R, Volonteri M, Witstok J, Zhang S.   +39 more
europepmc   +1 more source

Reduced gas accretion onto galaxies due to effects of external giant radio lobes. [PDF]

Proc Natl Acad Sci U S A
Qiu Y, Cen R.
europepmc   +1 more source