Results 81 to 90 of about 74,658 (229)

Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events

Astronomische Nachrichten, EarlyView.
ABSTRACT Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months‐to‐years, have been explained as accretion flares from the repeated tidal stripping of a star by an ...
Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham   +4 more
wiley   +1 more source

Very High-energy Gamma-Ray Episodic Activity of Radio Galaxy NGC 1275 in 2022–2023 Measured with MACE

The Astrophysical Journal Letters
The radio galaxy NGC 1275, located at the central region of Perseus cluster, is a well-known very high-energy (VHE) gamma-ray emitter. The Major Atmospheric Cherenkov Experiment Telescope has detected two distinct episodes of VHE ( E > 80 GeV) gamma-ray ...
S. Godambe, N. Mankuzhiyil, C. Borwankar, B. Ghosal, A. Tolamatti, M. Pal, P. Chandra, M. Khurana, P. Pandey, Z. A. Dar, S. Godiyal, J. Hariharan, Keshav Anand, S. Norlha, D. Sarkar, R. Thubstan, K. Venugopal, A. Pathania, S. Kotwal, Raj Kumar, N. Bhatt, K. Chanchalani, M. Das, K. K. Singh, K. K. Gour, M. Kothari, Nandan Kumar, Naveen Kumar, P. Marandi, C. P. Kushwaha, M. K. Koul, P. Dorjey, N. Dorji, V. R. Chitnis, R. C. Rannot, S. Bhattacharyya, N. Chouhan, V. K. Dhar, M. Sharma, K. K. Yadav   +39 more
doaj   +1 more source

3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039

, 2006
New observations of LS 5039, a High Mass X-ray Binary comprising a massive star and compact object, were carried out with the High Energy Stereoscopic System of Cherenkov Telescopes (H.E.S.S.) in 2005 at very high energy (VHE) gamma-ray energies.
A. Djannati-Ataï, A. Fiasson, A. G. Akhperjanian, A. Hoffmann, A. Jacholkowska, A. Konopelko, A. Lemière, A. M. Brown, A. Marcowith, A. Noutsos, A. R. Bazer-Bachi, A. Reimer, A. Santangelo, A. Shalchi, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Albert, Angelini, B. C. Raubenheimer, B. Degrange, B. Giebels, B. Khélifi, Bednarek, Bosch-Ramon, Böttcher, C. Boisson, C. Hadjichristidis, C. Masterson, C. Stegmann, C. van Eldik, C. Venter, Casares, Corbel, D. Berge, D. Emmanoulopoulos, D. Hauser, D. Horns, D. Nedbal, D. Spangler, de Jager, Distefano, Dubus, Dubus, E. Ferrero, E. Kendziorra, E. Moulin, F. Aharonian, F. Feinstein, F. Spanier, G. Dubus, G. Fontaine, G. Heinzelmann, G. Henri, G. Hermann, G. Maurin, G. Pelletier, G. Pühlhofer, G. Rowell, G. Superina, G. Vasileiadis, H. J. Dickinson, H. J. Völk, H. Sol, Harmon, Hartman, Heinz, I. Braun, I. Büsching, I. J. Latham, J. A. Hinton, J. F. Glicenstein, J. L. Osborne, J. M. Martin, J. Ripken, J.-P. Tavernet, K. Bernlöhr, K. Egberts, K. J. Orford, K. Kosack, Khangulyan, L. Costamante, L. O'C. Drury, L. Rob, L. Rolland, L. Saugé, L.-M. Chounet, M. Beilicke, M. de Naurois, M. Füßling, M. Hauser, M. Holleran, M. Lemoine-Goumard, M. Ouchrif, M. Panter, M. Punch, M. Raue, M. Tluczykont, M. Ward, Maraschi, Margon, Martí, Mirabel, Moderski, Moskalenko, Nu. Komin, O. Bolz, O. C. de Jager, O. Martineau-Huynh, O. Reimer, P. Espigat, P. Goret, P. M. Chadwick, P. Vincent, Paredes, Paredes, Paredes, Protheroe, R. Bühler, R. Cornils, R. Le Gallou, R. Schlickeiser, R. Schröder, R. Steenkamp, R. Terrier, Ribó, Ribó, Romero, S. Carrigan, S. Funk, S. J. Nolan, S. J. Wagner, S. M. Rayner, S. Pita, S. Schlenker, S. Schwarzburg, Scargle, Seb. Funk, T. J. L. McComb, T. Lohse, Tavani, U. Schwanke, V. Borrel, V. Sahakian, W. Benbow, W. Hofmann, Wen, Y. A. Gallant   +150 more
core   +2 more sources

Laue gamma-ray lenses for space astrophysics:status and prospects [PDF]

, 2010
We review feasibility studies, technological developments and astrophysical prospects for Laue lenses devoted to hard X-/gamma-ray astronomy observations.Comment: 26 pages, 24 figures. Published in a special issue (Volume 2010 (2010), Article ID 215375,
Frontera, Filippo, Von Ballmoos, Peter
core   +2 more sources

Ground-based gamma-ray astronomy [PDF]

AIP Conference Proceedings, 2000
Ground-based gamma-ray astronomy has become an active astrophysical discipline with four confirmed sources of TeV gamma rays, two plerionic supernova remnants (SNRs) and two BL Lac objects (BL Lacs). An additional nine objects (one plerion, three shell-type SNRs, one X-ray binary, and four BL Lacs) have been detected but have not been confirmed by ...
openaire   +2 more sources

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

Ultrafast Transitions in X‐Ray Irradiated Solids

Contributions to Plasma Physics, EarlyView.
ABSTRACT In this review, we present current developments on modeling ultrafast transitions in solids triggered by intense, atto‐ to femtosecond pulses from X‐ray free electron lasers. This specific irradiation regime requires dedicated simulation tools based on theoretical and computational methods, involving the elements of classical and quantum ...
Sebastião Antunes, Konrad J. Kapcia, Vladimir Lipp, Beata Ziaja   +3 more
wiley   +1 more source

Upper Limits on the Gamma-Ray Emission from the Microquasar V4641 Sgr

The Astrophysical Journal
Following a recent detection of TeV radiation by the Large High Altitude Air Shower Observatory and the High-Altitude Water Cherenkov Observatory, coincident with the direction of the microquasar V4641 Sgr, we search for possible GeV emission from this ...
Zihao Zhao, Jian Li, Diego F. Torres
doaj   +1 more source

Polycarbazole–NiOOH Interfacial Engineering of BiVO4 Photoanodes for Efficient and Stable Solar Water Splitting

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A π‐conjugated carbazole (p‐CBZ) layer is electro‐polymerized on BiVO4 to form a p–n heterojunction that enhances charge separation and suppresses surface recombination, while a NiOOH co‐catalyst accelerates oxygen evolution kinetics. The synergistic BVO/p‐CBZ/NiOOH photoanode delivers a high photocurrent density and long‐term stability for efficient ...
Lakshman Sundar Arumugam, Ana Gutierrez‐Blanco, Agustin O. Alvarez, Alejandro Saura Aviles, Mahesh Eledath‐Changarath, Rafael Abargues, Juan Francisco Sánchez‐Royo, Helena Rabelo, Maria Chiara Spadaro, Jordi Arbiol, Javier E. Durantini, Sixto Giménez   +11 more
wiley   +1 more source

Preflight Background Estimates for COSI

The Astrophysical Journal
The Compton Spectrometer and Imager (COSI) is a Compton telescope designed to survey the 0.2–5 MeV sky, consisting of a compact array of cross-strip germanium detectors.
Savitri Gallego, Uwe Oberlack, Jan Lommler, Christopher M. Karwin, Francesco Fenu, Valentina Fioretti, Andreas Zoglauer, F. M. Follega, A. Perinelli, Roberto Battiston, Roberto Iuppa, Steven E. Boggs, Saurabh Mittal, Pierre Jean, Carolyn Kierans, Dieter H. Hartmann, John A. Tomsick, (on behalf of the COSI Collaboration)   +17 more
doaj   +1 more source