Results 131 to 140 of about 49,075 (253)

Optical and ultraviolet observations of diffuse interstellar clouds [PDF]

Symposium - International Astronomical Union, 1997
Absorption-line studies of diffuse interstellar clouds have recently been invigorated at ultraviolet wavelengths with the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope and at optical wavelengths with efficient high resolution spectrographs and CCD detectors.
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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
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Formaldehyde production in diffuse interstellar clouds [PDF]

Monthly Notices of the Royal Astronomical Society, 1979
Millar, TJ, Duley, W.W., Williams, D.A.
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The Relation between Variances of 3D Density and Its 2D Column Density Revisited

The Astrophysical Journal
We revisit the relation between the variance of three-dimensional (3D) density ( ${\sigma }_{\rho }^{2}$ ) and that of the projected two-dimensional (2D) column density ( ${\sigma }_{{\rm{\Sigma }}}^{2}$ ) in turbulent media, which is of great importance
Heesun Yoon, Jungyeon Cho
doaj   +1 more source

Investigations of MWISP Filaments. I. Filament Identification and Analysis Algorithms, and Source Catalog

The Astrophysical Journal Supplement Series
Filaments play a crucial role in providing the necessary environmental conditions for star formation, actively participating in the process. To facilitate the identification and analysis of filaments, we introduce Directional and Positional Consistency ...
Yu Jiang, Xuepeng Chen, Sheng Zheng, Zhibo Jiang, Zhiwei Chen, Yao Huang, Yang Su, Li Sun, Jian-Cheng Feng, Haoran Feng, Ji Yang   +10 more
doaj   +1 more source

VLT/UVES Observations of Interstellar Molecules and Diffuse Bands in the Magellanic Clouds

, 2006
We discuss the abundances of interstellar CH, CH+, and CN in the Magellanic Clouds (MC), derived from spectra of 7 SMC and 13 LMC stars obtained (mostly) with the VLT/UVES.
Adamson A. J., Ballester P., Brunet J. P., Cami J., Chin Y.-N., Crawford I. A., D. E. Welty, D. L. Lambert, Danks A. C., D’Odorico S., Fukui Y., Gredel R., Gredel R., Heger M. L., Henkel C., Israel F. P., J. A. Thorburn, Jenniskens P., Jenniskens P., Johansson L. E. B., Koornneef J., Krelowski J., Lequeux J., Magain P., Mattila K., Mizuno N., R. Gredel, S. R. Federman, Snow T. P., Snow T. P., Snow T. P., Sonnentrucker P., Thaddeus P., Vladilo G., Yamaguchi R., Yamaguchi R.   +35 more
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Rotational equilibrium of C₂ in diffuse interstellar clouds

Astronomy & Astrophysics
Context. Recent spectroscopic measurements have revealed absorption from higher rotational levels in C2 than previous observations. These improvements are accompanied by the availability of updated radiative and collisional data. Aims. We revisit the density and radiation field intensity diagnostics provided by the observations of many rotational ...
J. Le Bourlot, E. Roueff, S. R. Federman, A. M. Ritchey, D. L. Lambert   +4 more
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Chemistry in Dense Molecular Clouds: Theory and Observational Constraints [PDF]

, 1988
For the most part, gas phase models of the chemistry of dense molecular clouds predict the abundances of simple species rather well. However, for larger molecules and even for small systems rich in carbon these models often fail spectacularly.
Blake, Geoffrey A.
core  

Star formation in a diffuse high-altitude cloud?

, 2016
A recent discovery of two stellar clusters associated with the diffuse high-latitude cloud HRK 81.4-77.8 has important implications for star formation in the Galactic halo.
Kerp, J., Lenz, D., Roehser, T.
core   +1 more source

Morphological Evidence for the eROSITA Bubbles Being Giant and Distant Structures

The Astrophysical Journal Letters
There are two contradictory views of the eROSITA bubbles: either a 10 ^4 pc scale pair of giant bubbles blown by the Galactic center (GC), or a 10 ^2 pc scale local structure coincidentally located in the direction of GC.
Teng Liu, Andrea Merloni, Jeremy Sanders, Gabriele Ponti, Andrew Strong, Michael C. H. Yeung, Nicola Locatelli, Peter Predehl, Xueying Zheng, Manami Sasaki, Michael Freyberg, Konrad Dennerl, Werner Becker, Kirpal Nandra, Martin Mayer, Johannes Buchner   +15 more
doaj   +1 more source