Results 51 to 60 of about 35,607 (205)

The Excitation of Extended Red Emission: New Constraints on its Carrier From HST Observations of NGC 7023 [PDF]

, 2005
The carrier of the dust-associated photoluminescence process causing the extended red emission (ERE) in many dusty interstellar environments remains unidentified.
Adolf N. Witt, Darbon S., Darbon S., Driebe T., Duley W. W., Duley W. W., d’Hendecourt L. B., Field D., Field D., Fuente A., Jones A. P., Karl D. Gordon, Leach S., Ledoux G., Lemaire J. L., Lemaire J. L., Mathis J. S., Paul H. Sell, Perrin J.-M., Perrin J.-M., Rui‐Hua Xie, Tracy L. Smith, Uma P. Vijh   +22 more
core   +2 more sources

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

The Effect of an Inert Solid Reservoir on Molecular Abundances in Dense Interstellar Clouds

, 2012
The question, what is the role of freeze-out of chemical species in determining the molecular abundances in the interstellar gas is a matter of debate.
Kalvans, Juris, Shmeld, Ivar
core   +1 more source

The Simons Observatory: Galactic Science Goals and Forecasts

The Astrophysical Journal, 2022
Observing in six frequency bands from 27 to 280 GHz over a large sky area, the Simons Observatory (SO) is poised to address many questions in Galactic astrophysics in addition to its principal cosmological goals.
Brandon S. Hensley, Susan E. Clark, Valentina Fanfani, Nicoletta Krachmalnicoff, Giulio Fabbian, Davide Poletti, Giuseppe Puglisi, Gabriele Coppi, Jacob Nibauer, Roman Gerasimov, Nicholas Galitzki, Steve K. Choi, Peter C. Ashton, Carlo Baccigalupi, Eric Baxter, Blakesley Burkhart, Erminia Calabrese, Jens Chluba, Josquin Errard, Andrei V. Frolov, Carlos Hervías-Caimapo, Kevin M. Huffenberger, Bradley R. Johnson, Baptiste Jost, Brian Keating, Heather McCarrick, Federico Nati, Mayuri Sathyanarayana Rao, Alexander van Engelen, Samantha Walker, Kevin Wolz, Zhilei Xu, Ningfeng Zhu, Andrea Zonca   +33 more
doaj   +1 more source

The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing small molecular PAHs

, 2003
We have obtained new STIS/HST spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a search for absorption features produced by polycyclic aromatic hydrocarbons (PAHs).
A. N. Witt, Allain T., Allain T., Allamandola L. J., Allamandola L. J., Boulanger F., D. C. B. Whittet, Duley W. W., F. Salama, Geoffrey C. Clayton, Karl D. Gordon, L. J. Allamandola, Leitherer C., Li A., Mattila K., Michael J. Wolff, Onaka T., Peter G. Martin, Schutte W. A., Smith R. G., T. P. Snow   +20 more
core   +1 more source

Astrochemistry: overview and challenges [PDF]

, 2017
This paper provides a brief overview of the journey of molecules through the Cosmos, from local diffuse interstellar clouds and PDRs to distant galaxies, and from cold dark clouds to hot star-forming cores, protoplanetary disks, planetesimals and ...
van Dishoeck, Ewine F.
core   +3 more sources

Over the possible role of metal atom clusters in cosmochemistry and in the origin of life

Revista de Química, 1992
We present here the hypothesis of a possible relationship between metal atom clusters and the formation of organic molecules in the interstellar medium and on small bodies as a possible pathway to the origin of such molecules.
Silvio Dioses Castro, Richard Korswagen
doaj  

H2 Ortho–Para Spin Conversion on Inhomogeneous Grain Surfaces. II. Impact of the Rotational Energy Difference between Adsorbed Ortho-H2 and Para-H2 and Implication for Deuterium Fractionation Chemistry

The Astrophysical Journal
We investigate how the H _2 ortho-to-para ratio (OPR) and deuterium fractionation in star-forming regions are affected by nuclear spin conversion (NSC) on dust grains. Particular focus is placed on the rotational energy difference between ortho-H _2 (o-H
Kenji Furuya, Toshiki Sugimoto, Kazunari Iwasaki, Masashi Tsuge, Naoki Watanabe   +4 more
doaj   +1 more source

Unidentified Infrared Emission Bands in the Diffuse Interstellar Medium

, 2000
Using the Mid-Infrared Spectrometer on board the Infrared Telescope in Space and the low-resolution grating spectrometer (PHT-S) on board the Infrared Space Observatory, we obtained 820 mid-infrared (5 to 12 $\mu$m) spectra of the diffuse interstellar ...
Boulanger F., Cesarsky D., Clegg P. E., Dartois E., Duley W. W., d’Hendecourt L. B., Feinstein A., H. Okuda, H. Shibai, Habing H. J., I. Yamamura, Jourdain de Muizon M., K. Okumura, Kessler M., Kin‐Wing Chan, Leger A., Lemke D., M. Mizutani, Mattila K., Mattila K., Murakami H., Okumura K., Omont A., Onaka T., Papoular R., Puget J. L., Roelfsema P. R., T. L. Roellig, T. Nakagawa, T. Onaka, T. Tanabe, Trams N., Verstraete L.   +32 more
core   +2 more sources

Tautomerization Kinetics of Thiouracils at Low Temperatures Driven Solely by Quantum‐Mechanical Tunnelling: Predictions of Suitable Candidates for Future Experiments

International Journal of Chemical Kinetics, Volume 58, Issue 6, Page 269-277, June 2026.
ABSTRACT In the past two decades numerous experiments have been conducted on the kinetics of reactions occurring at low temperatures on inert matrices. In particular, unimolecular proton‐transfer photo‐reactions of compounds containing a carbon–sulfur double bond, or thione group C═S, can lead to the formation of higher energy isomers or tautomers with
Judith Wurmel, John M. Simmie
wiley   +1 more source