Results 81 to 90 of about 35,438 (198)

Jets from the Upper Scorpius Variable Young Star System 2MASS J16075796-2040087 via KECK/HIRES Spectro-astrometry

The Astrophysical Journal
2MASS J16075796-2040087 is an ∼5 Myr young star in Upper Sco with evidence for accretion bursts on a timescale of about 15 days and, uncommonly for its age, outflows traced by multicomponent forbidden emission lines (FELs).
Emma T. Whelan, Miriam Keppler, Neal J. Turner, Ilaria Pascucci, Erika Hamden, Keri Hoadley, Min Fang   +6 more
doaj   +1 more source

The dynamics, appearance and demographics of relativistic jets triggered by tidal disruption of stars in quiescent supermassive black holes

, 2012
We examine the consequences of a model in which relativistic jets can be triggered in quiescent massive black holes when a geometrically thick and hot accretion disk forms as a result of the tidal disruption of a star.
Ayal, Berger, Bogdanović, Bromberg, Cannizzo, Cenko, Chen, De Colle, De Colle, Enrico Ramirez-Ruiz, Fabio De Colle, Fender, Frank, Fryxell, Garcia, Gezari, Greene, Guillochon, Guillochon, Guillochon, Gültekin, James Guillochon, Jill Naiman, Kelly, Kobayashi, Krolik, Krolik, Lazzati, Loeb, Merritt, Merritt, Mïller, Naiman, Najarro, Ouyed, Quataert, Quataert, Ramirez-Ruiz, Ramirez-Ruiz, Rosswog, Shao, Socrates, Tout, Wang, Woosley, Xiao   +45 more
core   +1 more source

A Monopolar Jet from Protostar HOPS 10: Evidence for Asymmetric Magnetized Launching

The Astronomical Journal
A fundamental challenge in star formation is understanding how a protostar accretes mass from its circumstellar disk while removing excess angular momentum.
Somnath Dutta
doaj   +1 more source

The turbulent formation of stars

, 2018
How stars are born from clouds of gas is a rich physics problem whose solution will inform our understanding of not just stars but also planets, galaxies, and the universe itself. Star formation is stupendously inefficient. Take the Milky Way. Our galaxy
Federrath, Christoph
core   +1 more source

Ambipolar Diffusion in Young Stellar Object Jets

The Astrophysical Journal, 1999
We address the issue of ambipolar diffusion in Herbig-Haro (HH) jets. The current consensus holds that these jets are launched and collimated via MHD forces. Observations have, however, shown that the jets can be mildly to weakly ionized. Beginning with a simple model for cylindrical equilibrium between neutral, plasma, and magnetic pressures, we ...
Adam Frank, Thomas A. Gardiner, Guy Delemarter, Thibaut Lery, Riccardo Betti   +4 more
openaire   +1 more source

Jet-Driven Formation of Bipolar Rings in Planetary Nebulae: Numerical Simulations Inspired by NGC 1514

The Open Journal of Astrophysics
We conduct three-dimensional hydrodynamical simulations of jets launched into a dense shell, reproducing two rings in a bipolar structure that resemble the two dusty rings of the planetary nebula (PN) NGC 1514.
Muhammad Akashi, Ealeal Bear, Noam Soker
doaj   +1 more source

Gamma-Ray Burst Timing: Decoding the Hidden Slow Jets in GRB 060729

The Astrophysical Journal Letters
Gamma-ray bursts (GRBs) are luminous stellar explosions characterized by the ejection of relativistic jets. This work proposes a novel paradigm to study these GRB jets. By analyzing the timing information of prompt pulses and X-ray flares, in conjunction
Jin-Jun Geng, Ding-Fang Hu, Hao-Xuan Gao, Yi-Fang Liang, Yan-Long Hua, Guo-Rui Zhang, Tian-Rui Sun, Bing Li, Yuan-Qi Liu, Fan Xu, Chen Deng, Chen-Ran Hu, Ming Xu, Yong-Feng Huang, Miao-Miao Zhang, Min Fang, Jing-Zhi Yan, Tao An, Xue-Feng Wu   +18 more
doaj   +1 more source

Investigating Protostellar Accretion-driven Outflows across the Mass Spectrum: JWST NIRSpec Integral Field Unit 3–5 μm Spectral Mapping of Five Young Protostars

The Astrophysical Journal
Investigating Protostellar Accretion is a Cycle 1 JWST program using the NIRSpec+MIRI integral field units to obtain 2.9–28 μ m spectral cubes of five young protostars with luminosities of 0.2–10,000 L _⊙ in their primary accretion phase.
Samuel A. Federman, S. Thomas Megeath, Adam E. Rubinstein, Robert Gutermuth, Mayank Narang, Himanshu Tyagi, P. Manoj, Guillem Anglada, Prabhani Atnagulov, Henrik Beuther, Tyler L. Bourke, Nashanty Brunken, Alessio Caratti o Garatti, Neal J. Evans II, William J. Fischer, Elise Furlan, Joel D. Green, Nolan Habel, Lee Hartmann, Nicole Karnath, Pamela Klaassen, Hendrik Linz, Leslie W. Looney, Mayra Osorio, James Muzerolle Page, Pooneh Nazari, Riwaj Pokhrel, Rohan Rahatgaonkar, Will R. M. Rocha, Patrick Sheehan, Katerina Slavicinska, Thomas Stanke, Amelia M. Stutz, John J. Tobin, Lukasz Tychoniec, Ewine F. Van Dishoeck, Dan M. Watson, Scott Wolk, Yao-Lun Yang   +38 more
doaj   +1 more source

Planetary Nebula Morphologies Indicate a Jet-Driven Explosion of SN 1987A and Other Core-Collapse Supernovae

Galaxies
I demonstrate the usage of planetary nebulae (PNe) to infer that a pair of jets shaped the ejecta of the core-collapse supernova (CCSN) SN 1987A. The main structure of the SN 1987A inner ejecta, the ‘keyhole’, comprises two low-intensity zones.
Noam Soker
doaj   +1 more source

Influence of Jets on [O iii] Extensions in Green Pea/Bean Galaxies

The Astrophysical Journal
We present a study investigating the influence of jets on galaxies exhibiting strong [O iii ] λ 5007 emission, known as Green Peas and Green Beans . Our sample comprised 12 nearby sources ( z ∼ 0.04–0.1, six with jets and six without jets) with high [O ...
Harshitha K. Bhat, Andreas Eckart, Persis Misquitta, Monica Valencia-S., Madeleine Yttergren, Anton Zensus   +5 more
doaj   +1 more source