Results 61 to 70 of about 45,520 (173)

Multi-messenger aspects of cosmic neutrinos*

EPJ Web of Conferences, 2016
The recent observation of TeV-PeV neutrinos by IceCube has opened a new window to the high-energy Universe. I will discuss this signal in the context of multi-messenger astronomy.
Ahlers Markus
doaj   +1 more source

Active Galactic Nuclei: Jets as the Source of Hadrons and Neutrinos

Acta Polytechnica CTU Proceedings, 2014
Active galactic nuclei are extragalactic sources, and their relativistic hot-plasma jets are believed to be the main candidates of the cosmic-ray origin, above the so-called knee region of the cosmic-ray spectrum.
Athina Meli, Paolo Ciarcelluti
doaj   +1 more source

Outlook for ultraviolet astronomy [PDF]

A brief overview of galactic and extragalactic research is given with emphasis on the problems of temperature determination, chemical abundance determination, and the question about the energy sources for the high temperature regions.
Boehm-Vitense, E.
core   +1 more source

Toward a Unification of Star Formation Rate Determinations in the Milky Way and Other Galaxies

, 2011
The star formation rate (SFR) of the Milky Way remains poorly known, with often-quoted values ranging from 1 to 10 solar masses per year. This situation persists despite the potential for the Milky Way to serve as the ultimate SFR calibrator for external
Alexander, Baars, Bertelli, Bouwens, Broos, Calzetti, Calzetti, Celnik, Chiappini, Choi, Chomiuk, Chu, Collison, Cox, da Silva, Dale, Davies, Feigelson, Feigelson, Feigelson, Figer, Fioc, Fullmer, Gagné, Getman, Getman, Giles, Green, Green, Gvaramadze, Hammer, Hanson, Heiderman, Hillenbrand, Kennicutt, Kennicutt, Kennicutt, Koenig, Kroupa, Larson, Laura Chomiuk, Lee, Lehmer, Leitherer, Limongi, Madau, Matthew S. Povich, Maíz Apellániz, Maíz Apellániz, McKee, Mezger, Mezger, Milisavljevic, Mineo, Moffat, Moshir, Moustakas, Muench, Murray, Neff, Oey, Osterbrock, Pakull, Pannuti, Parra, Povich, Povich, Povich, Povich, Povich, Preibisch, Price, Reed, Robitaille, Robitaille, Saikia, Sanders, Scalo, Siess, Smith, Tsujimoto, Ulvestad, Vázquez, Wang, Wang, Wolk, Xu   +86 more
core   +1 more source

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +1 more source

High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam: Project Overview and First Data Release

The Astrophysical Journal Supplement Series
High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4 m Blanco telescope.
Ming-Yang Zhuang, Qian Yang, Yue Shen, Monika Adamów, Douglas N. Friedel, R. A. Gruendl, Zachary Stone, Junyao Li, Xin Liu, Paul Martini, Timothy M. C. Abbott, Scott F. Anderson, Roberto J. Assef, Franz E. Bauer, Richard Bielby, W. N. Brandt, Colin J. Burke, Jorge Casares, Yu-Ching Chen, Gisella De Rosa, Alex Drlica-Wagner, Tom Dwelly, Alice Eltvedt, Gloria Fonseca Alvarez, Jianyang Fu, Cesar Fuentes, Melissa L. Graham, Catherine J. Grier, Nathan Golovich, Patrick B. Hall, Patrick Hartigan, Keith Horne, Anton M. Koekemoer, Mirko Krumpe, Jennifer I. Li, Chris Lidman, Umang Malik, Amelia Mangian, Andrea Merloni, Claudio Ricci, Mara Salvato, Rob Sharp, David E. Trilling, Brad E. Tucker, Di Wen, Zachary Wideman, Yongquan Xue, Zhefu Yu, Catherine Zucker   +48 more
doaj   +1 more source

The Energetic Gamma-Ray Experiment Telescope (EGRET) Science Symposium [PDF]

The principle purpose of this symposium is to provide the EGRET (Energetic Gamma-Ray Experiment Telescope) scientists with an opportunity to study and improve their understanding of high energy gamma ray astronomy.
Fichtel, Carl E., Hunter, Stanley D., Sreekumar, Parameswaran, Stecker, Floyd W.   +3 more
core   +1 more source

Resolved Measurements of X_(CO) in NGC 6946 [PDF]

, 2012
We present the largest sample to date of giant molecular clouds (GMCs) in a substantial spiral galaxy other than the Milky Way. We map the distribution of molecular gas with high resolution and image fidelity within the central 5 kpc of the spiral galaxy
Carty, Misty, Donovan Meyer, Jennifer, Egusa, Fumi, Fukuhara, Masayuki, Kennicutt, Robert, Koda, Jin, Kuno, Nario, Momose, Rieko, Mooney, Thomas, Sawada, Tsuyoshi, Scoville, Nick, Towers, Sarah   +11 more
core  

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco

Astronomische Nachrichten, Volume 345, Issue 5, June 2024.
Abstract The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion
Jaroslav Merc, Peter Velez, Stéphane Charbonnel, Olivier Garde, Pascal Le Dû, Lionel Mulato, Thomas Petit, Jan Skowron   +7 more
wiley   +1 more source

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source