Results 31 to 40 of about 66,780 (247)

Stellar Library of Differential Emission Measures and Extreme Ultraviolet Spectra: Dwarf Stars Observed by the Extreme Ultraviolet Explorer

The Astrophysical Journal
Extreme ultraviolet (EUV; 100–912 Å) photons influence the formation and evolution of planets by ionizing hydrogen and other species, but the EUV radiation of most exoplanet host stars is poorly constrained.
Girish M. Duvvuri, Zachory K. Berta-Thompson, J. Sebastian Pineda, Kevin France, Alexander Brown, Allison Youngblood, David J. Wilson, Cynthia S. Froning, P. Christian Schneider, Thomas Ayres, Keivan G. Stassun   +10 more
doaj   +1 more source

The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters

The Astrophysical Journal Supplement Series, 2022
The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not possible due to absorption by the intergalactic medium ...
Sophia R. Flury, Anne E. Jaskot, Harry C. Ferguson, Gábor Worseck, Kirill Makan, John Chisholm, Alberto Saldana-Lopez, Daniel Schaerer, Stephan McCandliss, Bingjie Wang, N. M. Ford, Timothy Heckman, Zhiyuan Ji, Mauro Giavalisco, Ricardo Amorin, Hakim Atek, Jeremy Blaizot, Sanchayeeta Borthakur, Cody Carr, Marco Castellano, Stefano Cristiani, Stephane De Barros, Mark Dickinson, Steven L. Finkelstein, Brian Fleming, Fabio Fontanot, Thibault Garel, Andrea Grazian, Matthew Hayes, Alaina Henry, Valentin Mauerhofer, Genoveva Micheva, M. S. Oey, Goran Ostlin, Casey Papovich, Laura Pentericci, Swara Ravindranath, Joakim Rosdahl, Michael Rutkowski, Paola Santini, Claudia Scarlata, Harry Teplitz, Trinh Thuan, Maxime Trebitsch, Eros Vanzella, Anne Verhamme, Xinfeng Xu   +46 more
doaj   +1 more source

Shallow Ultraviolet Transits of WD 1145+017 [PDF]

, 2019
WD 1145+017 is a unique white dwarf system that has a heavily polluted atmosphere, an infrared excess from a dust disk, numerous broad absorption lines from circumstellar gas, and changing transit features, likely from fragments of an actively ...
Dalba, Paul A., Debes, John, Dufour, Patrick, Fortin-Archambault, Maude, Fukui, Akihiko, Gary, Bruce, Hallakoun, Na'ama, Jura, Michael A., Klein, Beth, Kusakabe, Nobuhiko, Muirhead, Philip S., Narita, Norio, Steele, Amy, Su, Kate Y. L., Vanderburg, Andrew, Watanabe, Noriharu, Xu, Siyi, Zhan, Zhuchang, Zuckerman, Ben   +18 more
core   +1 more source

Exploiting Two‐Photon Lithography, Deposition, and Processing to Realize Complex 3D Magnetic Nanostructures

Advanced Functional Materials, EarlyView.
Two‐photon lithography (TPL) enables 3D magnetic nanostructures with unmatched freedom in geometry and material choice. Advances in voxel control, deposition, and functionalization open pathways to artificial spin ices, racetracks, microrobots, and a number of additional technological applications.
Joseph Askey, Arjen van den Berg, Sandra Ruiz Gomez, Claire Donnelly, Dirk Grundler, Sam Ladak   +5 more
wiley   +1 more source

The AstroSat UV Deep Field South. II. A Diverse Set of Lyman-continuum Leakers at z ∼ 1

The Astrophysical Journal
We report the detection of five newly identified Lyman-continuum (LyC) leaker candidates at redshifts 0.99–1.42 in the AstroSat UV Deep Field South F154W image.
Soumil Maulick, Kanak Saha, Michael J. Rutkowski   +2 more
doaj   +1 more source

The status and future of EUV astronomy

, 2013
The Extreme Ultraviolet wavelength range was one of the final windows to be opened up to astronomy. Nevertheless, it provides very important diagnostic tools for a range of astronomical objects, although the opacity of the interstellar medium restricts ...
Barstow, M. A., Casewell, S. L., Holberg, J. B., Kowalski, M. P.   +3 more
core   +1 more source

Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3

Advanced Functional Materials, EarlyView.
Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh, Ymir K. Frodason, Clemens Petersen, Benjamin M. Janzen, Luca Sung‐Min Choi, Nils Bernhardt, Felix Nippert, Zbigniew Galazka, Joel B. Varley, Holger von Wenckstern, Lasse Vines, Markus R. Wagner   +11 more
wiley   +1 more source

Ultraviolet and Gravitational Wave Signatures of Magnetar Formation

The Astrophysical Journal
We investigate the impact of gravitational wave (GW) emission by a newly born magnetar onto its electromagnetic (EM) counterparts in the Ultraviolet Transient Astronomy Satellite (ULTRASAT) band.
Simone Dall’Osso, Dafne Guetta
doaj   +1 more source

A Census of Near-UV M-dwarf Flares Using Archival GALEX Data and the gPHOTON2 Pipeline

The Astrophysical Journal, 2023
M-dwarfs are common stellar hosts of habitable-zone exoplanets. Near-UV (NUV) radiation can severely impact the atmospheric and surface conditions of such planets, making the characterization of NUV flaring activity a key aspect in determining ...
Param Rekhi, Sagi Ben-Ami, Volker Perdelwitz, Yossi Shvartzvald   +3 more
doaj   +1 more source

A Brief History of AGN [PDF]

, 1999
Astronomers knew early in the twentieth century that some galaxies have emission-line nuclei. However, even the systematic study by Seyfert (1943) was not enough to launch active galactic nuclei (AGN) as a major topic of astronomy.
Antonucci R. A. R., Baldwin J. A., Bennett A. S., Blandford R. D., Collin-Souffrin S., Collin-Souffrin S., Collin-Souffrin S., Collin-Souffrin S., Courvoisier T. J.-L., Edge D. O., Elvis M., Fath E. A., Frank J., Ginzburg V. L., Gregory A. Shields, Heckman T. M., Hoyle F., Hoyle F., Kellermann K. I., Marshall N., Matthews T. A., Mills B. Y., Morris D., Orr M. J. L., Penston M. V., Pounds K., Pringle J. E., Ryle M., Ryle M., Scott P. F., Setti G., Shakura N. I., Shields G. A., Shklovskii I. S., Shklovskii I. S., Sholomitsky G. B., Slipher V. M., Souffrin S., Souffrin S., Terlevich R., Ulrich M.-H., Wilkes B. J., Wilkes B. J.   +42 more
core   +2 more sources