Results 31 to 40 of about 5,095,486 (206)

Detection of Millimeter Emission Lines from Interstellar Methyl Cyanide

The Astrophysical Journal, 1971
Millimeter emission lines from interstellar methyl cyanide transitions, noting kinetic temperature and hydrogen ...
P. M. Solomon, K. B. Jefferts, A. A. Penzias, R. W. Wilson   +3 more
openaire   +1 more source

Challenges and Techniques for Simulating Line Emission

Galaxies, 2018
Modeling emission lines from the millimeter to the UV and producing synthetic spectra is crucial for a good understanding of observations, yet it is an art filled with hazards. This is the proceedings of “Walking the Line”, a 3-day conference
Karen P. Olsen, Andrea Pallottini, Aida Wofford, Marios Chatzikos, Mitchell Revalski, Francisco Guzmán, Gergö Popping, Enrique Vázquez-Semadeni, Georgios E. Magdis, Mark L. A. Richardson, Michaela Hirschmann, William J. Gray   +11 more
doaj   +1 more source

The [C II] line emission as an interstellar medium probe in the MARIGOLD galaxies

Astronomy & Astrophysics
Context. The [C II] fine-structure line at 157.74 μm is one of the brightest far-infrared emission lines in galaxies and an important probe of galaxy properties such as the star formation rate (SFR) and the molecular gas mass (Mmol). Aims. Using high-resolution numerical simulations, we tested the reliability of the [C II] line as a tracer of Mmol in ...
Prachi Khatri, Emilio Romano-Díaz, Cristiano Porciani   +2 more
openaire   +2 more sources

Probing Interstellar Turbulence in the Warm Ionized Medium using Emission Lines [PDF]

, 1999
Latex, 7 pages, 4 figures. To be published in the Proceedings of the 2nd Guillermo Haro Conference on Interstellar Turbulence held in Puebla ...
Tufte, S. L., Reynolds, R. J., Haffner, L. M.   +2 more
openaire   +2 more sources

Optimizing End-to-End System Performance for Millimeter and Submillimeter Spectroscopy of Protostars: Wideband Heterodyne Receivers and Sideband-Deconvolution Techniques for Rapid Molecular-Line Surveys [PDF]

, 2011
This thesis describes the construction, integration, and use of a new 230-GHz ultra-wideband heterodyne receiver, as well as the development and testing of a new sideband-deconvolution algorithm, both designed to enable rapid, sensitive molecular-line ...
Sumner, Matthew Casey
core   +1 more source

High resolution measurements and modeling of auroral hydrogen emission line profiles [PDF]

, 2003
Measurements in the visible wavelength range at high spectral resolution (1.3 A° ) have been made at Longyearbyen, Svalbard (15.8 E,78.2 N) during an interval of intense proton precipitation.
Frey, H.U., H. U. Frey, D. Lummerzheim, Galand, M., Lummerzheim, D., S. C. Robertson, Robertson, SC, Frey, HU, Peticolas, L.M., Lummerzheim, D, Furniss, I, Baumgardner, J, M. Mendillo, Lanchester, B.S., J. Baumgardner, Baumgardner, J., Rees, M.H., I. Furniss, Lanchester, BS, Robertson, S. C., Furniss, I., M. Galand, Peticolas, L. M., Mendillo, M., Galand, M, B. S. Lanchester, Rees, MH, M. H. Rees, Peticolas, LM, Rees, M. H., L. M. Peticolas, Robertson, S.C., Lanchester, B. S., Mendillo, M, Frey, H. U.   +34 more
core   +2 more sources

The Lyα Sky as Observed by New Horizons at 57 au

The Astronomical Journal
During 2023 September the Alice ultraviolet spectrograph on the New Horizons (NH) spacecraft was used to map diffuse Lyα emission over most of the sky, at a range of ∼56.9 au from the Sun.
G. Randall Gladstone, J. Michael Shull, Wayne R. Pryor, Jonathan Slavin, Joshua A. Kammer, Tracy M. Becker, Tod R. Lauer, Marc Postman, John R. Spencer, Joel Wm. Parker, Kurt D. Retherford, Michael A. Velez, Maarten H. Versteeg, Michael W. Davis, Cynthia S. Froning, Camden D. Ertley, Nathaniel Cunningham, Jayant Murthy, Richard C. Henry, Seth Redfield, Carey M. Lisse, Kelsi N. Singer, Anne J. Verbiscer, Pontus C. Brandt, S. Alan Stern   +24 more
doaj   +1 more source

No “Maunder Minimum” Candidates in M67: Mitigating Interstellar Contamination of Chromospheric Emission Lines [PDF]

The Astronomical Journal, 2017
Abstract The solar analogs of M67 let us glimpse the probable behavior of the Sun on timescales surpassing the duration of human civilization. M67 can serve as a solar proxy because its stars share a similar age and composition with the Sun.
openaire   +2 more sources

Thin‐film lithium niobate photonics: Frontiers in millimeter‐wave and terahertz generation and integrated applications

InfoScience, Volume 3, Issue 3, September 2026.
With the advancement of 6G communications, high‐precision radar, and advanced imaging technologies, there is a growing demand for compact, high‐performance light sources capable of generating high‐frequency radio waves (millimeter‐wave and terahertz waves). This article systematically introduces how to efficiently generate these high‐frequency waves on
Jianfeng Xiong, Zhenyu Wang, Xu Li, Guo Tang, Sizhe Wang, Jiyuan Huang, Guochao Wang, Shuhua Yan, Wenzhao Sun   +8 more
wiley   +1 more source

A Solar Analog Model for Decrease in Far Ultraviolet Irradiance Under a Grand Minimum

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract Solar analog field stars having a range of magnetic activity can provide an estimate of solar spectral irradiance (SSI) variability relevant to understanding the Sun's influence on terrestrial climate. This approach is particularly useful for far ultraviolet (FUV) irradiance that cannot be observed from the Earth surface.
D. Lubin, C. Melis, D. Tytler
wiley   +1 more source