Results 131 to 140 of about 16,662 (218)

First Constraints on the Interstellar Medium Conditions of a Low-mass, Highly Obscured z = 4.27 Main-sequence Galaxy

The Astrophysical Journal
We present the molecular gas content and interstellar medium conditions of MACS J0717_Az9, a strong gravitationally lensed z = 4.273, M _* ≃ 2 × 10 ^9 M _⊙ star-forming galaxy with an unusually high (∼80%) obscured star formation fraction.
Andrew Mizener, Alexandra Pope, Jed McKinney, Patrick Kamieneski, Katherine E. Whitaker, Andrew Battisti, Eric Murphy   +6 more
doaj   +1 more source

The Impact of External Radiation on the Inner Disk Chemistry of Planet Formation

The Astrophysical Journal
The vast majority of young stars hosting planet-forming disks exist within clustered environments, like the Orion Nebula, implying that seemingly “extreme” UV environments (10 ^4 G _0 and above) are not so atypical in the context of planet formation ...
Jenny K. Calahan, Karin Öberg, Alice Booth   +2 more
doaj   +1 more source

H O in the Terrestrial Planet-forming Regions of Protoplanetary Disks

The Astrophysical Journal
Isotopologues play an important role in solar system cosmochemistry studies, revealing details of early planet formation physics and chemistry. Oxygen isotopes, as measured in solar system materials, reveal evidence for both mass-dependent fractionation ...
Colette Salyk, Klaus M. Pontoppidan, Ke Zhang, Sophie Heinzen, Jenny K. Calahan, Andrea Banzatti, D. Annie Dickson-Vandervelde, Edwin A. Bergin, Geoffrey A. Blake, Nicole Arulanantham, Sebastiaan Krijt, John Carr, Joan Najita, Joel Green, Carlos Romero-Mirza   +14 more
doaj   +1 more source

Tracing shocks and photodissociation in the Galactic center region

, 2008
We present a systematic study of the HNCO, C18O, 13CS, and C34S emission towards 13 selected molecular clouds in the Galactic center region. The molecular emission in these positions are used as templates of the different physical and chemical processes ...
de Vicente P., Flower D. R., Gusten R., Hasegawa T. I., Henkel C., Huttemeister S., Huttemeister S., J. Martín‐Pintado, Jansen D. J., Lindqvist M., M. A. Requena‐Torres, Mauersberger R., Mauersberger R., R. Mauersberger, Serabyn E., Sergio Martín, Zinchenko I., Zylka R.   +17 more
core   +1 more source

Detection of Formaldehyde Towards the Extreme Carbon Star IRC+10216

, 2004
We report the detection of H2CO (formaldehyde) around the carbon-rich AGB star, IRC+10216. We find a fractional abundance with respect to molecular hydrogen of x(H2CO)= (1.3 {+1.5}{-0.8}) x 10^{-8}.
Beust H., Cernicharo J., Colom P., Dartois E., David A. Neufeld, Gary J. Melnick, Jaruschewski S., K. E. Saavik Ford, Meier R., Peter Schilke, Pierazzo E., Tsuji T., Willacy K.   +12 more
core   +1 more source

Expansion Signatures in 35 H II Regions Traced by SOFIA [C II] Emission

The Astrophysical Journal
We analyze the expansion signatures of 35 H II regions mapped in [C II ] 158 μ m emission by the Stratospheric Observatory for Infrared Astronomy. The [C II ] emission primarily traces photodissociation regions (PDRs) at the transition between ionized ...
T. Faerber, L. D. Anderson, M. Luisi, L. Bonne, N. Schneider, V. Ossenkopf-Okada, A. G. G. M. Tielens, R. Simon, M. Röllig   +8 more
doaj   +1 more source

Spatially Resolved Galactic H ii Regions Observed by the LAMOST Medium-resolution Spectroscopic Survey of Nebulae (LAMOST MRS-N)

The Astronomical Journal
We present spatially resolved spectroscopic observations of 10 isolated Galactic H II regions using data from the LAMOST Medium-Resolution Spectroscopic Survey of Nebulae (LAMOST MRS-N).
Wei Zhang, Yunning Zhao, Lin Ma, Shiming Wen, Chaojian Wu, Juanjuan Ren, Jianjun Chen, Yuzhong Wu, Zhongrui Bai, Yonghui Hou, Yongheng Zhao, Hong Wu   +11 more
doaj   +1 more source

The chemistry of fluorine-bearing molecules in diffuse and dense interstellar gas clouds

, 2005
We present a theoretical investigation of the chemistry of fluorine-bearing molecules in diffuse and dense interstellar gas clouds. The chemistry of interstellar fluorine is qualitatively different from that of any other element, because - unlike the ...
Neufeld, David A., Schilke, Peter, Wolfire, Mark G.   +2 more
core   +1 more source

The Molecular Cloud Life Cycle. II. Formation and Destruction of Molecular Clouds Diagnosed via H2 Fluorescent Emission

The Astrophysical Journal
Molecular hydrogen (H _2 ) formation and dissociation are key processes that drive the gas life cycle in galaxies. Using the SImulating the LifeCycle of Molecular Clouds zoom-in simulation suite, we explore the utility of future observations of H _2 ...
Blakesley Burkhart, Shmuel Bialy, Daniel Seifried, Stefanie Walch, Erika Hamden, Thomas J. Haworth, Keri Hoadley, Shuo Kong, Madisen Johnson, Sarah Jeffreson, Mark R. Krumholz, Min-Young Lee, Amiel Sternberg, Neal J. Turner   +13 more
doaj   +1 more source

Resolved ALMA [C ii] 158 μm Observations at Cosmic Noon: Interstellar Medium Structure and Dynamics of the Starbursting QSO SDSS J1000

The Astrophysical Journal
We present spatially resolved Atacama Large Millimeter/submillimeter Array Band 9 observations of the [C ii ] 158 μ m fine structure line from an optically selected quasar, SDSS J100038.01+020822.4 (J1 000 ), at z = 1.8275.
Christopher Rooney, Bo Peng, Amit Vishwas, Gordon Stacey, Thomas Nikola, Cody Lamarche, Catie Ball, Carl Ferkinhoff, Drew Brisbin, Steven Hailey-Dunsheath   +9 more
doaj   +1 more source