Results 41 to 50 of about 55,785 (258)

What Kinds of Accretion Disks Are There in the Nuclei of Radio Galaxies? [PDF]

Publications of the Astronomical Society of Japan, 2010
It seems to be a widely accepted opinion that the types of accretion disks (or flows) generally realized in the nuclei of radio galaxies and in further lower mass-accretion rate nuclei are inner, hot, optically thin, radiatively inefficient accretion flows (RIAFs) surrounded by outer, cool, optically thick, standard-type accretion disks.
Kaburaki, Osamu, Nankou, Takanobu, Tamura, Naoya, Wajima, Kiyoaki   +3 more
openaire   +2 more sources

General-relativistic Resistive Magnetohydrodynamics with Robust Primitive-variable Recovery for Accretion Disk Simulations [PDF]

Astrophysical Journal Supplement Series, 2019
Recent advances in black hole astrophysics, particularly the first visual evidence of a supermassive black hole at the center of the galaxy M87 by the Event Horizon Telescope, and the detection of an orbiting “hot spot” nearby the event horizon of Sgr A*
B. Ripperda, F. Bacchini, O. Porth, E. Most, H. Olivares, A. Nathanail, L. Rezzolla, J. Teunissen, R. Keppens   +8 more
semanticscholar   +1 more source

On the Accretion Origin of a Vast Extended Stellar Disk around the Andromeda Galaxy [PDF]

The Astrophysical Journal, 2005
We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2800 stars with the Keck/DEIMOS spectrograph. The stellar structure spans radii from 15 kpc out to ~40 kpc, with detections out to R ~ 70 kpc.
Ibata, R, Chapman, S, Ferguson, AMN, Lewis, G, Irwin, M, Tanvir, N   +5 more
openaire   +3 more sources

The Decoupling of Binaries from Their Circumbinary Disks

The Astrophysical Journal Letters, 2023
We have investigated, both analytically and numerically, accreting supermassive black hole binaries as they inspiral due to gravitational radiation to elucidate the decoupling of binaries from their disks and inform future multimessenger observations of ...
Alexander J. Dittmann, Geoffrey Ryan, M. Coleman Miller   +2 more
doaj   +1 more source

Bulge formation inside quiescent lopsided stellar disks: connecting accretion, star formation and morphological transformation in a z ~ 3 galaxy group

, 2022
International audienceWe present well-resolved near-IR and sub-mm analysis of the three highly star-forming massive ($>10^{11}\,\rm M_{\odot}$) galaxies within the core of the RO-1001 galaxy group at $\rm z=2.91$.
Ivan Delvecchio, Daddi, Emmanuele, Valentino, Francesco Maria, Victor de Souza Magalhaes, Magalhaes, Victor, Veronica Strazzullo, Qinghua Tan, Boris S. Kalita, Emanuele Daddi, Tan, Q, Valentino, Francesco, Sandrine Codis, Tan, Qinghua, Francesco Valentino, Gómez-Guijarro, Carlos, Kalita, Boris S., Richard, Robert M., Delvecchio, Ivan, David Elbaz, Delvecchio, I., Rich, R. Michael, Pety, Jérôme, Jérôme Pety, Frederic Bournaud, Strazzullo, Veronica, Elbaz, D., Gomez-Guijarro, C., Robert Michael Rich, Daddi, Emanuele, Carlos Gómez-Guijarro, Codis, Sandrine, Elbaz, David, Magalhaes, Victor de Sousa, Bournaud, Frederic   +33 more
core   +1 more source

Magnetized Accretion Disks with Outflows for Changing-look AGNs

The Astrophysical Journal, 2023
Changing-look active galactic nuclei (CL-AGNs) challenge the standard accretion theory, owing to their rapid variability. Recent numerical simulations have shown that, for the sub-Eddington accretion case, the disk is magnetic pressure–dominated ...
Wen-Biao Wu, Wei-Min Gu
doaj   +1 more source

Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies [PDF]

The Astrophysical Journal, 2018
Abstract We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four months, with median cadences of 1.0 and 0.6 days for MCG+08-11-011 and NGC 2617, respectively, combined with ...
M. M. Fausnaugh, D. A. Starkey, Keith Horne, C. S. Kochanek, B. M. Peterson, M. C. Bentz, K. D. Denney, C. J. Grier, D. Grupe, R. W. Pogge, G. De Rosa, S. M. Adams, A. J. Barth, Thomas G. Beatty, A. Bhattacharjee, G. A. Borman, T. A. Boroson, M. C. Bottorff, Jacob E. Brown, Jonathan S. Brown, M. S. Brotherton, C. T. Coker, S. M. Crawford, K. V. Croxall, Sarah Eftekharzadeh, Michael Eracleous, M. D. Joner, C. B. Henderson, T. W.-S. Holoien, T. Hutchison, Shai Kaspi, S. Kim, Anthea L. King, Miao Li, Cassandra Lochhaas, Zhiyuan Ma, F. MacInnis, E. R. Manne-Nicholas, M. Mason, Carmen Montuori, Ana Mosquera, Dale Mudd, R. Musso, S. V. Nazarov, M. L. Nguyen, D. N. Okhmat, Christopher A. Onken, B. Ou-Yang, A. Pancoast, L. Pei, Matthew T. Penny, Radosław Poleski, Stephen Rafter, E. Romero-Colmenero, Jessie Runnoe, David J. Sand, Jaderson S. Schimoia, S. G. Sergeev, B. J. Shappee, Gregory V. Simonian, Garrett Somers, M. Spencer, Daniel J. Stevens, Jamie Tayar, T. Treu, Stefano Valenti, J. Van Saders, S. Villanueva, C. Villforth, Yaniv Weiss, H. Winkler, W. Zhu   +71 more
openaire   +6 more sources

Observational evidence for the accretion-disk origin for a radio jet in an active galaxy [PDF]

Nature, 2002
Accretion of gas onto black holes is thought to power the relativistic jets of material ejected from active galactic nuclei (AGN) and the 'microquasars' located in our Galaxy. In microquasars, superluminal radio-emitting features appear and propagate along the jet shortly after sudden decreases in the X-ray fluxes.
Marscher, Alan P., Jorstad, Svetlana G., Gomez, J. L., Aller, Margo F., Terasranta, H., Lister, M. L., Stirling, Alastair M.   +6 more
openaire   +3 more sources

GAS METALLICITIES IN THE EXTENDED DISKS OF NGC 1512 AND NGC 3621. CHEMICAL SIGNATURES OF METAL MIXING OR ENRICHED GAS ACCRETION? [PDF]

, 2012
We have obtained spectra of 135 H ii regions located in the inner and extended disks of the spiral galaxies NGC 1512 and NGC 3621, spanning the range of galactocentric distances 0.2–2 × R25 (from ∼2–3 kpc to ∼18–25 kpc).
F. Bresolin, R. Kennicutt, E. Ryan-Weber
semanticscholar   +1 more source

Accretion disk versus jet orientation in H₂O megamaser galaxies [PDF]

Astronomy & Astrophysics, 2019
Context. An essential part of the paradigm describing active galactic nuclei is the alignment between the radio jet and the associated rotation axis of the sub-pc accretion disks. Because of the small linear and angular scales involved, this alignment has not yet been checked in a sufficient number of low luminosity active galactic nuclei (LLAGNs ...
Kamali, F., Henkel, C., Koyama, S., Kuo, C., Condon, J., Brunthaler, A., Reid, M., Greene, J., Menten, K., Impellizzeri, C., Braatz, J., Litzinger, E., Kadler, M.   +12 more
openaire   +3 more sources