Results 21 to 30 of about 35,614 (300)

A diversity of progenitors and histories for isolated spiral galaxies [PDF]

, 2012
We analyze a suite of 33 cosmological simulations of the evolution of Milky Way-mass galaxies in low-density environments. Our sample spans a broad range of Hubble types at z=0, from nearly bulgeless disks to bulge-dominated galaxies.
Bournaud, Frederic, Croton, Darren J., Dekel, Avishai, Martig, Marie, Teyssier, Romain   +4 more
core   +3 more sources

YOUNG STELLAR OBJECTS IN LYNDS 1641: DISKS, ACCRETION, AND STAR FORMATION HISTORY [PDF]

The Astrophysical Journal Supplement Series, 2013
112 pages, 46 figures, 6 tables, accepted by ...
Fang, Min, Kim, Jinyoung Serena, van Boekel, Roy, Sicilia-Aguilar, Aurora, Henning, Thomas, Flaherty, Kevin   +5 more
openaire   +4 more sources

Magnetohydrodynamic Simulations of Stellar Magnetosphere–Accretion Disk Interaction

The Astrophysical Journal, 1997
The magnetohydrodynamic evolution of the interaction region between the inner edge of an accretion disk and the magnetosphere of the central object is studied by means of time-dependent numerical simulations. The simulations assume the disk is adiabatic, is axisymmetric, has nonzero resistivity, and is initially in Keplerian rotation. The magnetosphere
Kristen A. Miller, James M. Stone
openaire   +1 more source

The Z Camelopardalis-type Star AY Piscium: Stellar and Accretion Disk Parameters

The Astrophysical Journal, 2023
Abstract We present a new study of the Z Cam-type eclipsing cataclysmic variable AY Piscium with the aim of determining the fundamental parameters of the system and the structure of the accretion flow therein. We use time-resolved photometric observations supplemented by spectroscopy in the standstill, to which we applied our light-curve
Jan Kára, Sergey Zharikov, Marek Wolf, Ainash Amantayeva, Gulnur Subebekova, Serik Khokhlov, Aldiyar Agishev, Jaroslav Merc   +7 more
openaire   +3 more sources

Star Formation in Self-gravitating Disks in Active Galactic Nuclei. III. Efficient Production of Iron and Infrared Spectral Energy Distributions

The Astrophysical Journal, 2023
Strong iron lines are a common feature of the optical spectra of active galactic nuclei (AGNs) and quasars from z ∼ 6−7 to the local universe, and [Fe/Mg] ratios do not show cosmic evolution.
Jian-Min Wang, Shuo Zhai, Yan-Rong Li, Yu-Yang Songsheng, Luis C. Ho, Yong-Jie Chen, Jun-Rong Liu, Pu Du, Ye-Fei Yuan   +8 more
doaj   +1 more source

Fragmentation of Massive Protostellar Disks [PDF]

, 2006
We examine whether massive-star accretion disks are likely to fragment due to self-gravity. Rapid accretion and high angular momentum push these disks toward fragmentation, whereas viscous heating and the high protostellar luminosity stabilize them.
Adams, Artymowicz, Bally, Bate, Bernard, Beuther, Burkert, Cesaroni, Cesaroni, Chevalier, Chick, Chini, Christopher D. Matzner, De Buizer, De Buizer, De Marchi, Faúndez, Figer, Fleck, Gammie, Gilbert, Goodman, Goodman, Hillenbrand, Hinkley, Kaitlin M. Kratter, Kenyon, Kim, Krumholz, Krumholz, Laughlin, Levin, Matzner, Matzner, McKee, Monnier, Myers, Nelson, Olmi, Palla, Patel, Pinsonneault, Plume, Rafikov, Rice, Semenov, Shakura, Shepherd, Shu, Tan, Tan, Tan, Terebey, Tout, Turner, Van Den Bergh, Webbink, Whitney, Wolfire, Zhang   +59 more
core   +4 more sources

Alignment of Stellar and AGN Accretion Disks from SDSS Data [PDF]

Proceedings of the International Astronomical Union, 2009
Lagos, Padilla & Cora (2009) show that if alignments between the galaxy kinematics and the AGN system were to occur, massive galaxies should host BHs with high spin values, regardless of the detailed physics of the BH. Since the BH spin regulates the mass-to-energy conversion (Marconi et al. 2004) and possibly the existence of radio jets (Sikora et
Claudia del P. Lagos, Nelson D. Padilla, Michael A. Strauss, Lei Hao   +3 more
openaire   +1 more source

Young Stellar Objects, Accretion Disks, and Their Variability with Rubin Observatory LSST

The Astrophysical Journal Supplement Series, 2023
Abstract Vera C. Rubin Observatory, through the Legacy Survey of Space and Time (LSST), will allow us to derive a panchromatic view of variability in young stellar objects (YSOs) across all relevant timescales. Indeed, both short-term variability (on timescales of hours to days) and long-term variability (months to years), predominantly ...
R. Bonito, L. Venuti, S. Ustamujic, P. Yoachim, R. A. Street, L. Prisinzano, P. Hartigan, M. G. Guarcello, K. G. Stassun, T. Giannini, E. D. Feigelson, A. Caratti o Garatti, S. Orlando, W. I. Clarkson, P. McGehee, E. C. Bellm, J. E. Gizis   +16 more
openaire   +4 more sources

An Observational Perspective of Transitional Disks [PDF]

, 2014
Transitional disks are objects whose inner disk regions have undergone substantial clearing. The Spitzer Space Telescope produced detailed spectral energy distributions (SEDs) of transitional disks that allowed us to infer their radial dust disk ...
Andrews, Sean, Calvet, Nuria, D'Alessio, Paola, Espaillat, Catherine, Hashimoto, Jun, Kraus, Adam, Kraus, Stefan, Muzerolle, James, Najita, Joan, Zhu, Zhaohuan   +9 more
core   +2 more sources

High-energy Neutrinos from Stellar Explosions in Active Galactic Nuclei Accretion Disks [PDF]

The Astrophysical Journal Letters, 2021
Abstract Some catastrophic stellar explosions, such as supernovae (SNe), compact binary coalescences, and microtidal disruption events, are believed to be embedded in the accretion disks of active galactic nuclei (AGNs). We show high-energy neutrinos can be produced efficiently through pp interactions between shock-accelerated cosmic ...
Jin-Ping Zhu, Kai Wang, Bing Zhang
openaire   +2 more sources