Results 61 to 70 of about 301,318 (244)

The Quest for the Missing Dust. II. Two Orders of Magnitude of Evolution in the Dust-to-gas Ratio Resolved within Local Group Galaxies

The Astrophysical Journal, 2023
We explore evolution in the dust-to-gas ratio with density within four well-resolved Local Group galaxies—the LMC, SMC, M31, and M33. We do this using new Herschel maps, which restore extended emission that was missed by previous Herschel reductions ...
Christopher J. R. Clark, Julia C. Roman-Duval, Karl D. Gordon, Caroline Bot, Matthew W. L. Smith, Lea M. Z. Hagen   +5 more
doaj   +1 more source

CI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.
Abstract CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.
Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang   +11 more
wiley   +1 more source

SCUBA-2: A Large-Format CCD-Style Imager for Submillimeter Astronomy

, 2007
We describe the capabilities of SCUBA-2, the first CCD-like imager for submillimeter astronomy, and the technologies that make it possible. Unlike previous detectors using discrete bolometers, SCUBA-2 has two dc-coupled, monolithic arrays with a total of
Montgomery, D., Ellis, M., Fich, M., Gostick, D., Duncan, W., Naylor, D., Doriese, R., Parkes, W., Atkinson, D., Vale, L., Kelly, D., Halpern, M., Audley, M. D., MacIntosh, M., Walton, A., Woodcraft, Adam, Hilton, G., McGregor, H., Robson, I., Ullom, J., Kycia, J., Bastien, P., Hodson, T., Smith, I., Dunare, C., Pisano, Giampaolo, Sudiwala, Rashmikant V., Ade, Peter A. R., Hunt, Cynthia L., Gao, X., Walker, Ian Kenneth, Holland, W., Irwin, K., Reintsema, C., Mitchell, G., Cliffe, M., Gannaway, Frederick, Bintley, Dan   +37 more
core   +1 more source

Instrumentation for Kinetic-Inductance-Detector-Based Submillimeter Radio Astronomy [PDF]

, 2015
A substantial amount of important scientific information is contained within astronomical data at the submillimeter and far-infrared (FIR) wavelengths, including information regarding dusty galaxies, galaxy clusters, and star-forming regions; however ...
Duan, Ran
core   +1 more source

Ground‐Based Microwave Measurements of ClO and O3 Over Scott Base, Antarctica

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 7, 16 April 2026.
Abstract We present measurements from a new microwave instrument that has been deployed at Scott Base, Antarctica, primarily to measure ClO. The new instrument allows for the extension of the time series of lower stratospheric ClO measurements begun in 1996 at this site, while some of the technical improvements offer the possibility of making ...
Gerald E. Nedoluha, R. Michael Gomez, Ian Boyd, Helen Neal, Douglas R. Allen, Alan Parrish, Brian J. Connor, Michael Kotkamp, Kate McKenzie, Eric L. Fleming, Thomas F. Hanisco, Michelle L. Santee   +11 more
wiley   +1 more source

Astronomy & Astrophysics (CAUCASUS)-VOLUME 3

, 2020
The III volume of Journal “Astronomy & Astrophysics (Caucasus)” was dedicated to the 110th Anniversary of Academician Eugene Kharadze. Academician Evgene Kharadze Vice - President of International Union of Astronomy (1976-82) I would like to give you
(Caucasus)”, Astronomy & Astrophysics
core   +1 more source

OPTICAL SENSOR FOR SURFACE PROFILE MONITORING OF PARABOLIC ANTENNA FOR MILLIMETER AND SUBMILLIMETER ASTRONOMY

Radio Physics and Radio Astronomy, 2016
Purpose: developing the sensor for non-contact measurement and profiling parabolic surfaces of antenna systems in the millimeter and submillimeter range with an aperture diameter up to 2 m.
D. L. Chechetkin, I. P. Belyankin, V. V. Silin, S. I. Slavgorodskiy, V. M. Shulga   +4 more
doaj   +1 more source

Photonic Crystal Fibers in the Terahertz Regime: Design Strategies, Performance Metrics, and Emerging Applications: A Systematic Review

Advanced Photonics Research, Volume 7, Issue 4, April 2026.
An optimized octagonal‐core terahertz (THz) photonic crystal fiber sensor is presented for accurate identification of different milk samples based on refractive index variation. The structure enables highly confined THz guidance and strong light–analyte interaction, allowing reliable discrimination of camel, cow, buffalo, and sheep milk.
A. H. M. Iftekharul Ferdous, Ahmmad Musha, Khalid Sifulla Noor   +2 more
wiley   +1 more source

A Full Resolution of the 450 μm Extragalactic Background Light

The Astrophysical Journal Letters
The extragalactic background light (EBL) is the cumulative radiation outside the Milky Way. The determination of its corresponding primary emitting sources as well as its total energy level across the entire electromagnetic spectrum has profound ...
Qi-Ning Hsu, L. L. Cowie, Chian-Chou Chen, A. J. Barger   +3 more
doaj   +1 more source

The effect of early diagenetic processes on the quantification of fossil micrometeorite abundance and flux in the geological record

Meteoritics &Planetary Science, Volume 61, Issue 4, Page 551-564, April 2026.
Abstract Fossil micrometeorites (MMs) recovered from lithified sedimentary rocks, particularly iron‐rich (I‐type) cosmic spherules (CSs) provide valuable insights into past dust‐forming events. Their abundances, when combined with estimates of local sedimentation rates can be used to reconstruct the flux of extraterrestrial dust.
Isabelle S. Mattia, Matthew J. Genge, Martin D. Suttle   +2 more
wiley   +1 more source