Results 141 to 150 of about 6,292 (222)

Very high energy gamma ray observations of southern hemisphere blazars [PDF]

, 1997
This thesis is concerned with very high energy γ-ray observations of blazars observable from the southern hemisphere. The data presented were obtained using the recently deployed University of Durham Mark 6 high sensitivity Čerenkov telescope. Chapters 1
Dickinson, M.R., Dickinson, Mark R.
core  

A Unified Origin of Faraday Rotation toward 3C 84: The Circumnuclear Ambient Medium within the Parsec-scale Bondi Radius of the Host Galaxy NGC 1275

The Astrophysical Journal
We present multifrequency polarimetric observations of 3C 84 obtained with the Korean VLBI Network at 43–141 GHz, the Very Long Baseline Array at 43 GHz, and the High Sensitivity Array at 8 GHz from 2015 to 2024. We find that the Faraday rotation measure
Minchul Kam, Jongho Park, Sascha Trippe, Do-Young Byun, Keiichi Asada, Hiroshi Nagai, Motoki Kino, Luis C. Ho, Andrew C. Fabian, Jeffrey Hodgson, Kunwoo Yi, Kenji Toma, Junghwan Oh, Taehyun Jung   +13 more
doaj   +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

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

Fuelling active galactic nuclei

, 2007
We suggest that most nearby active galactic nuclei are fed by a series of small-scale, randomly oriented accretion events. Outside a certain radius these events promote rapid star formation, while within it they fuel the supermassive black hole.
A. R. King (7601711), J. E. Pringle (7581866)   +1 more
core  

Compact objects in active galactic nuclei and X-ray binaries

, 2007
In this thesis I study the inner-most regions of Active Galactic Nuclei (AGN) using the reverberation mapping technique, and neutron star low-mass X-ray binaries in quiescence using X-ray observations. Using the 13-year optical monitoring data for the
Cackett, Edward M.
core  

Cosmic ray feedback in galaxies and galaxy clusters: A pedagogical introduction and a topical review of the acceleration, transport, observables, and dynamical impact of cosmic rays. [PDF]

Astron Astrophys Rev, 2023
Ruszkowski M, Pfrommer C.
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

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