Results 91 to 100 of about 34,908 (184)

Testing models for molecular gas formation in galaxies: hydrostatic pressure or gas and dust shielding?

, 2010
Stars in galaxies form in giant molecular clouds that coalesce when the atomic hydrogen is converted into molecules. There are currently two dominant models for what property of the galactic disk determines its molecular fraction: either hydrostatic ...
Beck, Bell, Bell, Bigiel, Blitz, Blitz, Bolatto, Bowen, Brooks, Chung, Dale, de Vaucouleurs, Drissen, Fumagalli, Gil de Paz, Gnedin, Gnedin, Hopkins, Hunt, Hunt, Imara, Izotov, Izotov, Izotov, Kennicutt, Kobulnicky, Krumholz, Krumholz, Kunth, Lee, Lee, Leitherer, Leon, Leroy, Leroy, Leroy, Leroy, Leslie K. Hunt, Mark R. Krumholz, McKee, Michele Fumagalli, Noeske, Origlia, Pelupessy, Pustilnik, Reines, Robertson, Sage, Schmitt, Smith, Taylor, Thuan, Thuan, Thuan, Thuan, van Zee, van Zee, van Zee, Vanzi, Walter, Whitmore, Wolfire, Wolfire, Wong   +63 more
core   +1 more source

Modeling the gas-phase chemistry of the transitional disk around HD 141569A

, 2005
Aims: The chemistry, distribution and mass of the gas in the transitional disk around the 5 Myr old B9.5 V star HD 141569A are constrained. Methods: A quasi 2-dimensional (2D) chemistry code for photon dominated regions (PDR) is used to calculate the ...
Augereau, Augereau, B. Jonkheid, Black, Boccaletti, Brittain, Clampin, Delsemme, Dent, Draine, Draine, E. F. van Dishoeck, Hauschildt, Hogerheijde, I. Kamp, J.-C. Augereau, Jonkheid, Kamp, Kamp, Klahr, Li, Mathis, Merín, Mouillet, Pollack, Rossiter, Shu, Simon, Spaans, Sylvester, Tielens, van Dishoeck, van Dishoeck, Watson, Weinberger, Weinberger, Werner, Wyatt, Zuckerman   +38 more
core   +4 more sources

Study of H i Turbulence in the SMC Using Multipoint Structure Functions

The Astrophysical Journal
Turbulence in the interstellar medium (ISM) plays an important role in many physical processes, including forming stars and shaping complex ISM structures.
Bumhyun Lee, Min-Young Lee, Jungyeon Cho, Nickolas M. Pingel, Yik Ki Ma, Katie Jameson, James Dempsey, Helga Dénes, John M. Dickey, Christoph Federrath, Steven Gibson, Gilles Joncas, Ian Kemp, Shin-Jeong Kim, Callum Lynn, Antoine Marchal, N. M. McClure-Griffiths, Hiep Nguyen, Amit Seta, Juan D. Soler, Snežana Stanimirović, Jacco Th. van Loon   +21 more
doaj   +1 more source

X-ray spectroscopic observations and modeling of supernova remnants [PDF]

The X-ray observations of young remnants and their theoretical interpretation are described. A number of questions concerning the nature of the blast wave interaction with the interstellar gas and grains and of atomic processes in these hot plasmas are ...
Shull, J. M.
core   +1 more source

The first results from the Herschel-HIFI mission

, 2012
This paper contains a summary of the results from the first years of observations with the HIFI instrument onboard ESA's Herschel space observatory. The paper starts by outlining the goals and possibilities of far-infrared and submillimeter astronomy ...
van der Tak, Floris
core   +2 more sources

n-Alkanes formed by methyl-methylene addition as a source of meteoritic aliphatics

Communications Chemistry
Aliphatics prevail in asteroids, comets, meteorites and other bodies in our solar system. They are also found in the interstellar and circumstellar media both in gas-phase and in dust grains.
P. Merino, L. Martínez, G. Santoro, J. I. Martínez, K. Lauwaet, M. Accolla, N. Ruiz del Arbol, C. Sánchez-Sánchez, A. Martín-Jimenez, R. Otero, M. Piantek, D. Serrate, R. Lebrón-Aguilar, J. E. Quintanilla-López, J. Mendez, P. L. De Andres, J. A. Martín-Gago   +16 more
doaj   +1 more source

H i Content of Group Galaxies from the FAST All Sky H i Survey

The Astrophysical Journal
We investigate the atomic gas (H i ) content of galaxies in groups using early data from the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) All Sky H i survey. Taking advantage of FAST’s blind, wide-area coverage and uniform sensitivity, we
Shulan Yan, Andrew Ma, Qingzheng Yu, Taotao Fang, Chuan He, Ming Zhu   +5 more
doaj   +1 more source

FEASTS Compared with Simulations: Abnormally Irregular and Extended H i Morphologies at a Column Density of 1018 cm−2 in TNG50 and Auriga

The Astrophysical Journal
With new atomic-hydrogen (H i ) observations of FAST Extended Atlas of Selected Targets Survey (FEASTS), we present the first statistical comparison of H i morphology between observations and cosmological simulations, focusing on low-column-density (∼10 ^
Xuchen Lin, Jing Wang, Guinevere Kauffmann, Volker Springel, Rüdiger Pakmor   +4 more
doaj   +1 more source

The Impact of External Gas Accretion on the Distribution of H I Gas in Galaxies

The Astrophysical Journal
Using the data from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) and H i -MaNGA surveys, we build a sample of 37 gas–star misaligned galaxies with robust H i detections, which are believed to have undergone external gas accretion processes.
Qianhan Zhang, Min Bao, Yanmei Chen, Niankun Yu, Yong Shi, Luis C. Ho   +5 more
doaj   +1 more source

Pervasive Cavity-rim Structure for Star Formation in Dwarf Irregular Galaxies

The Astrophysical Journal
Unsharp-mask images of H I emission from 36 dwarf irregular (dIrr) galaxies illustrate star formation in dispersed clouds and on the rims of large cavities. The cavities can extend for a radial scale length and typically have circular or slightly sheared
Bruce G. Elmegreen, Deidre A. Hunter
doaj   +1 more source