Results 111 to 120 of about 2,644 (226)

The absence of crystalline silicates in the diffuse interstellar medium

, 2004
Infrared spectroscopy provides a direct handle on the composition and structure of interstellar dust. We have studied the dust along the line of sight toward the Galactic center using Short Wavelength Spectrometer data obtained with the Infrared Space ...
Kemper, F., Kemper, F, Vriend, WJ, Vriend, W. J., Tielens, A. G G M, Tielens, AGGM   +5 more
core   +2 more sources

FAST Search for Circumstellar Atomic Hydrogen. III. Planetary Nebulae at Galactic Latitudes ∣b∣ ≥ 10°

The Astronomical Journal
The detection of circumstellar atomic hydrogen (H i ) via the 21 cm line remains a persistent challenge in planetary nebula (PN) studies, primarily due to contamination from ubiquitous interstellar H i 21 cm emission. In this paper, we report the results
Xu-Jia Ouyang, Yong Zhang, Albert Zijlstra, Chuan-Peng Zhang, Jun-ichi Nakashima, Quentin A. Parker, Xiao-Hu Li   +6 more
doaj   +1 more source

FURTHER EVIDENCE FOR THE IDENTIFICATION OF INTERSTELLAR ABSORPTION LINES IN TERMS OF $H_{2}$ TRANSITIONS

, 1975
$^{1}$ J. A. Duardo, Interstellar $H_{2}$ Narrow and Diffuse Line Absorption"", Twenty-Ninth Symposium on Molecular Structure and Spectroscopy, The Ohio State University, June, 1974.""""Author Institution: Xerox Electro-Optical SystemsA total of fourteen
Duardo, J. A.
core  

Measuring the star formation rate density from CNOC2 [PDF]

, 2006
This thesis charts the evolution of the Universal Star Formation Rate Density (SFRD) across the redshift range 0.2 < z < 0.6, using the 2nd Canadian Network for Observational Cosmology Survey (CN0C2).
Whitaker, Richard James
core  

Aliphatic hydrocarbon content of interstellar dust

, 2018
There is considerable uncertainty as to the amount of carbon incorporated in interstellar dust. The aliphatic component of the carbonaceous dust is of particular interest because it produces a significant 3.4 mu m absorption feature when viewed against a
Schmidt, TW ; https://orcid.org/, B Günay, Schmidt, T. W., Nauta, K, Kable, SH ; https://orcid.org/, O Krechkivska, Afsar, M, Afsar, M., Krechkivska, O., Rawal, A ; https://orcid.org/, Krechkivska, O, A Rawal, Burton, MG ; https://orcid.org/, K Nauta, Nauta, K., Günay, B, M G Burton, Kable, S. H., Gunay, B., T W Schmidt, Burton, M. G., M Afşar, Rawal, A., Gunay, Burcu, S H Kable   +24 more
core   +1 more source

A Simulated Galaxy Laboratory: Exploring the Observational Effects on UV Spectral Absorption Line Measurements

The Astrophysical Journal
Ultraviolet absorption line spectroscopy is a sensitive diagnostic for the properties of interstellar and circumgalactic gas. Down-the-barrel observations, where the absorption is measured against the galaxy itself, are commonly used to study feedback ...
R. Michael Jennings, Alaina Henry, Valentin Mauerhofer, Timothy Heckman, Claudia Scarlata, Cody Carr, Xinfeng Xu, Mason Huberty, Simon Gazagnes, Anne E. Jaskot, Jeremy Blaizot, Anne Verhamme, Sophia R. Flury, Alberto Saldana-Lopez, Matthew J. Hayes, Maxime Trebitsch   +15 more
doaj   +1 more source

Quasar Winds Caught on Acceleration and Deceleration

The Astrophysical Journal Supplement Series
We present an observational study of wind acceleration based on four low-ionization broad absorption line (BAL) quasars (J0136, J1238, J1259, and J1344).
Weimin Yi, P. B. Hall, Zunli Yuan, W. N. Brandt, D. P. Schneider, Zhicheng He, Jin-Ming Bai, Xue-Bing Wu   +7 more
doaj   +1 more source

A Catalog of Hα Emission-line Stars and 785 Newly Identified Young Stellar Object Candidates from LAMOST Based on a Deep Learning Method

The Astrophysical Journal Supplement Series
The H α emission line commonly appears in the spectra of many stars and serves as a key indicator for tracing ionized interstellar gas, investigating stellar activity, and studying gas dynamics.
Lei Tan, Ying Mei, Jiale Qian, Xiaolong Wang, Yue Cui, Aixin Huang, Feng Wang, Hui Deng, Chao Liu, Huanbin Chi   +9 more
doaj   +1 more source

Interstellar spectral features and telluric absorption lines

, 2012
In good quality spectra of stars the weak interstellar absorption lines may be substantially contaminated by telluric lines. Many telluric lines may also simulate interstellar absorptions. To avoid undesirable telluric effects during searches for interstellar absorptions, especially for diffuse interstellar bands (DIBs), we looked for all accessible ...
Kuźmicz, Agnieszka, Wszołek, B.
openaire   +2 more sources

GMRT observations of interstellar clouds in the 21cm line of atomic hydrogen.

, 2001
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)Nearby interstellar clouds with high (|v| >/= 10 km/s) random velocities although easily detected in NaI and CaII lines have hitherto not been detected (
Chengalur, Jayaram N., Dwarakanath, K.S., Chengalur, J.N., Dwarakanath, K. S., Mohan, Rekhesh, Srinivasan, G.   +5 more
core   +1 more source