Results 31 to 40 of about 35,920 (261)

Interstellar processes: Ortho/para conversion, radiative association, and dissociative recombination

EPJ Web of Conferences, 2015
The study of the ortho-to-para ratio of assorted gas-phase interstellar molecules such as H2, H2O, NH3, and H2O+ has gained interest in recent years, based partially on new spectral observations of light hydrides by the Herschel Space Observatory ...
Herbst Eric
doaj   +1 more source

The SPHEREx Target List of Ice Sources (SPLICES)

The Astrophysical Journal, 2023
One of the primary objectives of the SPHEREx mission is to understand the origin of molecules such as H _2 O, CO _2 , and other volatile compounds at the early stages of planetary system formation.
Matthew L. N. Ashby, Joseph L. Hora, Kiran Lakshmipathaiah, Sarita Vig, Rama Krishna Sai Subrahmanyam Gorthi, Miju Kang, Volker Tolls, Gary J. Melnick, Michael W. Werner, Brendan P. Crill, Daniel C. Masters, Carlos Contreras Peña, Jeong-Eun Lee, Jaeyeong Kim, Ho-Gyu Lee, Sung-Yong Yoon, Soung-Chul Yang, Nicholas Flagey, Bertrand Mennesson   +18 more
doaj   +1 more source

Hydro-chemical study of the evolution of interstellar pre-biotic molecules during the collapse of molecular clouds

, 2012
One of the stumbling blocks for studying the evolution of interstellar molecules is the lack of adequate knowledge of the rate co-efficients of various reactions which take place in the Interstellar medium and molecular clouds.
Ankan Das, Boogert, Chakrabarti, Chakrabarti, Chakrabarti, Cuppen, Das, Fuente, Gibb, Guelin, Ioppolo, Kuan, Liton Majumdar, Sandip K. Chakrabarti, Snyder, Sonali Chakrabarti, Woon   +16 more
core   +1 more source

A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?

The Astrophysical Journal Supplement Series, 2023
We conducted observations of multiple HC _3 N ( J = 10−9, 12−11, and 16−15) lines and the N _2 H ^+ ( J = 1−0) line toward a large sample of 61 ultracompact (UC) H ii regions, through the Institut de Radioastronomie Millmétrique 30 m and the Arizona ...
Y. X. Wang, J. S. Zhang, H. Z. Yu, Y. Wang, Y. T. Yan, J. L. Chen, J. Y. Zhao, Y. P. Zou   +7 more
doaj   +1 more source

Synthetic Approaches to Complex Organic Molecules in the Cold Interstellar Medium

Frontiers in Astronomy and Space Sciences, 2022
The observation and synthesis of organic molecules in interstellar space is one of the most exciting and rapidly growing topics in astrochemistry.
Eric Herbst, Eric Herbst, Robin T. Garrod, Robin T. Garrod   +3 more
doaj   +1 more source

Molecular Hydrogen Formation via Vibrational Excitation of Partially Superhydrogenated Pyrenes

The Astrophysical Journal
While polycyclic aromatic hydrocarbons (PAHs) are now accepted to be abundant in interstellar space, the abundance and influence of superhydrogenated PAHs (HPAHs) in the interstellar medium (ISM) are still under investigation.
Frederik Doktor S. Simonsen, Rijutha Jaganathan, Julianna Palotás, Zeyuan Tang, Bjørk Hammer, Jos Oomens, Liv Hornekær   +6 more
doaj   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, EarlyView.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Centrosymmetric molecules as possible carriers of diffuse interstellar bands

, 2010
In this paper, we present new data with interstellar C2 (Phillips bands A-X), from observations made with the Ultraviolet-Visual Echelle Spectrograph of the European Southern Observatory.
Bakker, Bakker, Ballik, Ballik, Chauville, Crawford, Douay, Douglas, F. A. Musaev, Frisch, G. A. Galazutdinov, Galazutdinov, Galazutdinov, Gredel, Heger, Herbig, Herbig, Hobbs, J. Krełowski, Kaźmierczak, Kaźmierczak, Langhoff, M. Kaźmierczak, M. R. Schmidt, Maier, Marenin, Morton, Sarre, Sonnentrucker, Thorburn, Van Dishoeck, Van Dishoeck, Westerlund, Y. Betelesky, Ádámkovics   +34 more
core   +1 more source

Radiolysis of ammonia-containing ices by energetic, heavy and highly charged ions inside dense astrophysical environments [PDF]

, 2009
Deeply inside dense molecular clouds and protostellar disks, the interstellar ices are protected from stellar energetic UV photons. However, X-rays and energetic cosmic rays can penetrate inside these regions triggering chemical reactions, molecular ...
Balanzat, E., Boduch, P., da Silveira, E. F., Domaracka, A., Duarte, E. Seperuelo, Pilling, S., Rothard, H.   +6 more
core   +3 more sources

Reactivity of a Substituted Aryloxenium Cation with a Triplet Ground State

Chemistry – A European Journal, EarlyView.
A substituted aryloxenium cation with a triplet electronic ground state is not a strong electrophile like the analogous singlet aryloxenium cations. It undergoes only radical reactions that are remarkably fast for a delocalized π‐type biradical. Abstract Aryloxenium cations contain a formally positively charged, monovalent oxygen atom. In spite of this
Tuong V. Nguyen, John J. Nash, Hilkka I. Kenttämaa   +2 more
wiley   +1 more source