Results 31 to 40 of about 318,054 (345)

Explaining the Chemical Inventory of Orion KL through Machine Learning

The Astrophysical Journal, 2023
The interplay of the chemistry and physics that exists within astrochemically relevant sources can only be fully appreciated if we can gain a holistic understanding of their chemical inventories. Previous work by Lee et al.
Haley N. Scolati, Anthony J. Remijan, Eric Herbst, Brett A. McGuire, Kin Long Kelvin Lee   +4 more
doaj   +1 more source

The Way of Water: ALMA Resolves H2O Emission Lines in a Strongly Lensed Dusty Star-forming Galaxy at z ∼ 3.1

The Astrophysical Journal, 2023
We report Atacama Large Millimeter/submillimeter Array (ALMA) high-resolution (≲0.3″) observations of water emission lines p -H _2 O(2 _02 − 1 _11 ), o -H _2 O(3 _21 − 3 _12 ), p -H _2 O(4 _22 − 4 _13 ), in the strongly lensed galaxy HATLASJ113526.2 ...
Francesca Perrotta, Marika Giulietti, Marcella Massardi, Giovanni Gandolfi, Tommaso Ronconi, Maria Vittoria Zanchettin, Quirino D’ Amato, Meriem Behiri, Martina Torsello, Francesco Gabrielli, Lumen Boco, Vincenzo Galluzzi, Andrea Lapi   +12 more
doaj   +1 more source

Super Star Clusters in SBS0335-052E [PDF]

, 2008
As one of the lowest metallicity star forming galaxies, with a nucleus of several super star clusters, SBS0335-052E is the subject of substantial current study.
Bekki, Charles Engelbracht, Devecchi, Dowell, Elmegreen, Engelbracht, Fatuzzo, Glenn Schneider, Houck, Izotov, Izotov, Kunth, Kunth, Leitherer ., Leonardo Vanzi, Lytle, Marc Sauvage, Osterbrock, Pustilnik, Reines, Robert C. Kennicutt, Rodger I. Thompson, Seth, Thompson, Thompson, Thuan, Vanzi, Witt, Wolniewicz, Zhang, Zwart, Östlin   +31 more
core   +1 more source

The star-forming region in Cepheus A

The Astrophysical Journal, 1984
Resultats d'observations de Cep A a 2,1 cm et 6 cm. La condensation contient deux chapelets de regions H II d'environ 0,1 pc de longueur, produites par environ 14 etoiles ressemblant aux etoiles B3 de la sequence principale. Les regions H II sont tres jeunes, ∼10 3 ans et on suggere que l'environnement est controle par un champ ...
Hughes, V.A., Wouterloot, J.G.A.
openaire   +4 more sources

Identifying Physical Structures in Our Galaxy with Gaussian Mixture Models: An Unsupervised Machine Learning Technique

The Astrophysical Journal, 2023
We explore the potential of the Gaussian mixture model (GMM), an unsupervised machine-learning method, to identify coherent physical structures in the interstellar medium.
M. Tiwari, R. Kievit, S. Kabanovic, L. Bonne, F. Falasca, C. Guevara, R. Higgins, M. Justen, R. Karim, Ü. Kavak, C. Pabst, M. W. Pound, N. Schneider, R. Simon, J. Stutzki, M. Wolfire, A. G. G. M. Tielens   +16 more
doaj   +1 more source

The metallicity of circumnuclear star-forming regions [PDF]

, 2008
We present a spectrophotometric study of circumnuclear star forming regions (CNSFR) in the early type spiral galaxies: NGC 2903, NGC 3351 and NGC 3504, all of them of over solar metallicity according to standard empirical calibrations. A detailed determination of their abundances is made after careful subtraction of the very prominent underlying ...
A. I. Díaz, Elena Terlevich, M. Castellanos, Guillermo F. Hägele   +3 more
openaire   +3 more sources

Hydrogen Fluoride in High-Mass Star-forming Regions [PDF]

, 2012
Hydrogen fluoride has been established to be an excellent tracer of molecular hydrogen in diffuse clouds. In denser environments, however, the HF abundance has been shown to be approximately two orders of magnitude lower.
Ceccarelli, Cecilia, Emprechtinger, Martin, Lis, Dariusz C., Monje, Raquel R., Neufeld, David, Phillips, Thomas G., van der Tak, Floris F. S., van der Wiel, Matthijs H. D.   +7 more
core   +4 more sources

CHEMICAL EVOLUTION OF STAR-FORMING REGIONS

Annual Review of Astronomy and Astrophysics, 1998
▪ Abstract  Recent advances in the understanding of the chemical processes that occur during all stages of the formation of stars, from the collapse of molecular clouds to the assemblage of icy planetesimals in protoplanetary accretion disks, are reviewed.
van Dishoeck, Ewine F., Blake, Geoffrey A.   +1 more
openaire   +6 more sources

Star-Forming Regions in the SMC [PDF]

Proceedings of the International Astronomical Union, 2006
AbstractSMC has been going through an active star formation epoch, especially during the last 0.2 Gyr when the close encounter with the LMC occured. Our goal is to detect regions dominated by early-type stars and gas and examine their behaviour at different wavelengths.
E. Kontizas, D. Kester, N. Mizuno, Uli Klein, M. Kontizas, Yasuo Fukui, P. Tsalmantza, I. Gonidakis, E. Livanou   +8 more
openaire   +2 more sources

Star-forming Clumps in Local Luminous Infrared Galaxies [PDF]

, 2019
We present HST narrowband near-infrared imaging of Paα and Paβ emission of 48 local luminous infrared galaxies (LIRGs) from the Great Observatories All-Sky LIRG Survey.
Armus, L., Barcos-Muñoz, L., Bonfini, P., Charmandaris, V., Cook, D., Díaz-Santos, T., Evans, A. S., Howell, J., Larson, K. L., Linden, S. T., Medling, A., Murphy, E. J., Oklopčić, A., Privon, G. C., Rich, J., Sanders, D. B., Stierwalt, S., U, V.   +17 more
core   +3 more sources