Results 91 to 100 of about 22,763 (197)

Detections of Compact Radio Continuum toward Methanol Maser Rings Using the VLA

The Astrophysical Journal
High-mass protostars are deeply embedded in dust inside their natal cores and are not easily detectable. However, maser emission at centimeter wavelengths, owing to its high brightness, enables us to study gas kinematics in protostars’ circumstellar ...
Anna Bartkiewicz, Olga Bayandina, Alberto Sanna, Marian Szymczak, Luca Moscadelli, Agnieszka Kobak, Huib Jan van Langevelde, Ashwin Varma   +7 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

Spitzer Space Telescope Spectroscopy of Ices toward Low-Mass Embedded Protostars [PDF]

, 2004
Sensitive 5-38 μm Spitzer Space Telescope and ground-based 3-5 μm spectra of the embedded low-mass protostars B5 IRS1 and HH 46 IRS show deep ice absorption bands superposed on steeply rising mid-infrared continua.
Blake, Geoffrey A., Boogert, A. C. Adwin, Brooke, Timothy Y., Brown, Joanna, Morris, Patrick, Noriega-Crespo, Alberto, Padgett, Deborah L., Sargent, Anneila I., Stapelfeldt, Karl R.   +8 more
core   +1 more source

Tracking Star-forming Cores as Mass Reservoirs in Clustered and Isolated Regions Using Numerical Passive Tracer Particles

The Astrophysical Journal
Understanding the physical properties of star-forming cores as mass reservoirs for protostars and the impact of turbulence is crucial in star formation studies.
Shingo Nozaki, Hajime Fukushima, Kazuki Tokuda, Masahiro N. Machida   +3 more
doaj   +1 more source

Disk Wind Feedback from High-mass Protostars. IV. Shock-ionized Jets

The Astrophysical Journal
Massive protostars launch accretion-powered, magnetically collimated outflows, which play crucial roles in the dynamics and diagnostics of the star formation process. Here we calculate the shock heating and resulting free–free radio emission in numerical
Emiko C. Gardiner, Jonathan C. Tan, Jan E. Staff, Jon P. Ramsey, Yichen Zhang, Kei E. I. Tanaka   +5 more
doaj   +1 more source

The infrared Galactic disk: What have we learned?

EPJ Web of Conferences, 2012
A brief overview is given of some of the new insights we have achieved from the Spitzer/GLIMPSE/MIPSGAL surveys of the Galactic plane. Particular emphasis is given to infrared bubbles, rapidly accreting protostars, infrared dark clouds, and diffuse PAH ...
Churchwell E.
doaj   +1 more source

Protostellar half-life: new methodology and estimates

, 2018
(Abridged) Protostellar systems evolve from prestellar cores, through the deeply embedded stage and then disk-dominated stage, before they end up on the main sequence.
Dunham, M. M., Kristensen, L. E.
core   +1 more source

ngVLA Synthetic Observations of Ionized Gas in Massive Protostars

The Astrophysical Journal
Massive-star formation involves significant ionization in the innermost regions near the central object, such as gravitationally trapped H ii regions, jets, ionized disks, or winds. Resolved observations of the associated continuum and recombination line
Jesús M. Jáquez-Domínguez, Roberto Galván-Madrid, Alfonso Trejo-Cruz, Carlos Carrasco-González, Jacopo Fritz, Susana Lizano, Aina Palau, Andrés F. Izquierdo, Luis F. Rodríguez, Alice Pasetto, Stanley Kurtz, Thomas Peters, Eric F. Jiménez-Andrade, Luis A. Zapata   +13 more
doaj   +1 more source

Protostellar Disk Formation Regimes: Angular Momentum Conservation versus Magnetic Braking

The Astrophysical Journal Letters
Protostellar disks around young protostars exhibit diverse properties, with their radii ranging from less than ten to several hundred astronomical units.
Hsi-Wei Yen, Yueh-Ning Lee
doaj   +1 more source

The Protostars in Orion: Characterizing the Properties of Their Magnetized Envelopes

The Astrophysical Journal
We present a study connecting the physical properties of protostellar envelopes to the morphology of the envelope-scale magnetic field. We used the Atacama Large Millimeter/submillimeter Array (ALMA) polarization observations of 61 young protostars at 0 ...
Bo Huang, Josep M. Girart, Ian W. Stephens, Manuel Fernández López, Philip C. Myers, Qizhou Zhang, John J. Tobin, Paulo Cortes, Nadia M. Murillo, Sarah Sadavoy, Hector G. Arce, John M. Carpenter, Woojin Kwon, Valentin J. M. Le Gouellec, Zhi-Yun Li, Leslie W. Looney, Tom Megeath, Erin G. Cox, Nicole Karnath, Dominique Segura-Cox   +19 more
doaj   +1 more source