Results 41 to 50 of about 1,548 (142)

Beam Measurements of Full Stokes Parameters for the FAST L-band 19-beam Receiver

The Astronomical Journal
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has been fully operational since 2020 January 11. We present a comprehensive analysis of the beam structure for each of the 19 feed horns on FAST's L -band receiver across the Stokes I , Q ,
Xunzhou Chen, Tao-Chung Ching, Di Li, Carl Heiles, Timothy Robishaw, Xuan Du, Marko Krco, Peng Jiang, Qingliang Yang, Jiguang Lu   +9 more
doaj   +1 more source

Spectroscopy For Cool Astronomical Objects

, 2014
Session V: Astronomy and Astrophysics. June 25, 2014.
Bernath, P. F., Brooke, J. S. A., Ram, R. S., Sneden, C.   +3 more
openaire   +1 more source

Research Status and Development Direction of Well Log Cyclostratigraphy

Cejing jishu
Well log cyclostratigraphy has become the foundation for studying many key scientific issues in the field of geosciences by identifying, extracting, and interpreting astronomical cycles recorded by geophysical logs. This paper analyzes the driving forces
PENG Cheng, ZOU Changchun, CAO Jinyu
doaj   +1 more source

Vibrational Spectroscopy of and in the Mid-infrared: A Comparison with Astronomical Observations

The Astrophysical Journal
In recent years, astronomical observations, in combination with laboratory spectra and theoretical modeling, have confirmed the presence of C _60 , ${{\rm{C}}}_{60}^{+}$ and C _70 across a broad range of astrophysical objects. Despite expectations that ${
Thomas E. Douglas-Walker, Olivia O’Neill, Ewen K. Campbell   +2 more
doaj   +1 more source

Gemini High-resolution Optical Spectrograph (GHOST) at Gemini South: Instrument Performance and Integration, First Science, and Next Steps

The Astronomical Journal
The Gemini South telescope is now equipped with a new high-resolution spectrograph called the Gemini High-resolution Optical SpecTrograph (GHOST). This instrument provides high-efficiency, high-resolution spectra covering 347–1060 nm in a single exposure
V. M. Kalari, R. J. Diaz, G. Robertson, A. McConnachie, M. Ireland, R. Salinas, P. Young, C. Simpson, C. Hayes, J. Nielsen, G. Burley, J. Pazder, M. Gomez-Jimenez, E. Martioli, S. B. Howell, M. Jeong, S. Juneau, R. Ruiz-Carmona, S. Margheim, A. Sheinis, A. Anthony, G. Baker, T. A. M. Berg, T. Cao, E. Chapin, T. Chin, K. Chiboucas, V. Churilov, E. Deibert, A. Densmore, J. Dunn, M. L. Edgar, J. Heo, D. Henderson, T. Farrell, J. Font, V. Firpo, J. Fuentes, K. Labrie, S. Lambert, J. Lawrence, J. Lothrop, R. McDermid, B. W. Miller, G. Perez, V. M. Placco, P. Prado, C. Quiroz, F. Ramos, R. Rutten, K. M. G. Silva, J. Thomas-Osip, C. Urrutia, W. D. Vacca, K. Venn, F. Waller, L. Waller, M. White, S. Xu, R. Zhelem   +59 more
doaj   +1 more source

Empirically Constraining the Spectra of Stellar Surface Features Using Time-resolved Spectroscopy

The Astrophysical Journal Letters
Transmission spectroscopy is currently the technique best suited to study a wide range of planetary atmospheres, leveraging the filtering of a star’s light by a planet’s atmosphere rather than its own emission.
David Berardo, Julien de Wit, Benjamin V. Rackham   +2 more
doaj   +1 more source

Weighted Stacking of Radio Images Affected by Noise and Interfering Signals

The Astrophysical Journal Supplement Series
We implement an algorithm based on the weighted stacking of astronomical images that can combine different observations of the same region of the sky removing the interfering signals.
Giulia Murgia, Sofia Fatigoni
doaj   +1 more source

Results from NASA’s First Radio Telescope on the Moon: Terrestrial Technosignatures and the Low-frequency Galactic Background Observed by ROLSES-1 on Board the Odysseus Lander

The Astronomical Journal
Radio wave Observations on the Lunar Surface of the photo-Electron Sheath (ROLSES-1) instrument on board Intuitive Machines’ Odysseus lunar lander represents NASA’s first radio telescope on the Moon, and the first United States spacecraft landing on the ...
Joshua J. Hibbard, Jack O. Burns, Robert MacDowall, Natchimuthuk Gopalswamy, Scott A. Boardsen, William Farrell, Damon Bradley, Thomas M. Schulszas, Johnny Dorigo Jones, David Rapetti, Jake D. Turner   +10 more
doaj   +1 more source

Discovery of WINERED-HVS1: A Metal-rich Hypervelocity Star Candidate Ejected from the Galactic Center

The Astrophysical Journal
We report the discovery of a metal-rich red-giant star, WINERED-HVS1, which is a candidate for a hypervelocity star (HVS). Its past trajectory suggests that this star may have been ejected by the Galactic supermassive black hole (SMBH; Sgr A*), with a ...
Kohei Hattori, Daisuke Taniguchi, Takuji Tsujimoto, Noriyuki Matsunaga, Hiroaki Sameshima, Scarlet S. Elgueta, Shogo Otsubo   +6 more
doaj   +1 more source

The Physical and Mathematical Meaning of Temperature and Its Implications for Astronomy

Galaxies
Temperatures reported for astronomical objects are commonly extreme, and all are ascertained indirectly, using spectroscopy. However, narrow spectral peaks record microscopic behavior (transitions), whereas temperature is a macroscopic (bulk) feature of ...
Robert E. Criss, Anne M. Hofmeister
doaj   +1 more source