排序方式: 共有10条查询结果,搜索用时 15 毫秒
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N. R. Tanvir A. J. Levan E. Rol R. L. C. Starling J. Gorosabel R. S. Priddey D. Malesani P. Jakobsson P. T. O'Brien A. O. Jaunsen J. Hjorth J. P. U. Fynbo A. Melandri A. Gomboc B. Milvang-Jensen A. S. Fruchter M. Jarvis C. A. C. Fernandes T. Wold 《Monthly notices of the Royal Astronomical Society》2008,388(4):1743-1750
Gamma-ray bursts (GRBs) are powerful probes of the early Universe, but locating and identifying very distant GRBs remain challenging. We report here the discovery of the K -band afterglow of Swift GRB 060923A, imaged within the first hour post-burst, and the faintest so far found. It was not detected in any bluer bands to deep limits, making it a candidate very high- z burst ( z ≳ 11) . However, our later-time optical imaging and spectroscopy reveal a faint galaxy coincident with the GRB position which, if it is the host, implies a more moderate redshift (most likely z ≲ 2.8 ) and therefore that dust is the likely cause of the very red-afterglow colour. This being the case, it is one of the few instances so far found of a GRB afterglow with high-dust extinction. 相似文献
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M. I. Wilkinson A. Vallenari C. Turon U. Munari D. Katz G. Bono M. Cropper A. Helmi N. Robichon F. Thévenin S. Vidrih T. Zwitter F. Arenou M.-O. Baylac G. Bertelli A. Bijaoui F. Boschi F. Castelli F. Crifo M. David A. Gomboc A. Gómez M. Haywood U. Jauregi P. de Laverny Y. Lebreton P. Marrese T. Marsh S. Mignot D. Morin S. Pasetto M. Perryman A. Pra A. Recio-Blanco F. Royer A. Sellier A. Siviero R. Sordo C. Soubiran L. Tomasella Y. Viala 《Monthly notices of the Royal Astronomical Society》2005,359(4):1306-1335
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S. R. Oates C. G. Mundell S. Piranomonte K. L. Page M. De Pasquale A. Monfardini A. Melandri S. Zane C. Guidorzi D. Malesani A. Gomboc N. Bannister A. J. Blustin M. Capalbi D. Carter P. D'Avanzo S. Kobayashi H. A. Krimm P. T. O'Brien M. J. Page R. J. Smith I. A. Steele N. Tanvir 《Monthly notices of the Royal Astronomical Society》2006,372(1):327-337
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A. Melandri C. Guidorzi S. Kobayashi D. Bersier C. G. Mundell P. Milne A. Pozanenko W. Li A. V. Filippenko Y. Urata M. Ibrahimov I. A. Steele A. Gomboc R. J. Smith N. R. Tanvir E. Rol K. Huang 《Monthly notices of the Royal Astronomical Society》2009,395(4):1941-1949
We present a comprehensive multiwavelength temporal and spectral analysis of the 'fast rise exponential decay' GRB 070419A. The early-time emission in the γ-ray and X-ray bands can be explained by a central engine active for at least 250 s, while at late times the X-ray light curve displays a simple power-law decay. In contrast, the observed behaviour in the optical band is complex (from 102 up to 106 s). We investigate the light-curve behaviour in the context of the standard forward/reverse shock model; associating the peak in the optical light curve at ∼450 s with the fireball deceleration time results in a Lorenz factor Γ≈ 350 at this time. In contrast, the shallow optical decay between 450 and 1500 s remains problematic, requiring a reverse shock component whose typical frequency is above the optical band at the optical peak time for it to be explained within the standard model. This predicts an increasing flux density for the forward shock component until t ∼ 4 × 106 s , inconsistent with the observed decay of the optical emission from t ∼ 104 s . A highly magnetized fireball is also ruled out due to unrealistic microphysic parameters and predicted light-curve behaviour that is not observed. We conclude that a long-lived central engine with a finely tuned energy injection rate and a sudden cessation of the injection is required to create the observed light curves, consistent with the same conditions that are invoked to explain the plateau phase of canonical X-ray light curves of γ-ray bursts. 相似文献
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We present projected rotational velocity measurements of the red giant in the symbiotic star MWC 560, using the high‐resolution spectroscopic observations with the FEROS spectrograph. We find that the projected rotational velocity of the red giant is v sin i = 8.2 ± 1.5 km s–1, and estimate its rotational period tobe Prot = 144–306 days. Using the theoretical predictions of tidal interaction and pseudosynchronization, we estimate the orbital eccentricity e = 0.68–0.82. We briefly discuss the connection of our results with the photometric variability of the object (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Tanvir N. R. Le Floc’h E. Christensen L. Caruana J. Salvaterra R. Ghirlanda G. Ciardi B. Maio U. D’Odorico V. Piedipalumbo E. Campana S. Noterdaeme P. Graziani L. Amati L. Bagoly Z. Balázs L. G. Basa S. Behar E. De Cia A. Valle M. Della De Pasquale M. Frontera F. Gomboc A. Götz D. Horvath I. Hudec R. Mereghetti S. O’Brien P. T. Osborne J. P. Paltani S. Rosati P. Sergijenko O. Stanway E. R. Szécsi D. Tot́h L. V. Urata Y. Vergani S. Zane S. 《Experimental Astronomy》2021,52(3):219-244
Experimental Astronomy - At peak, long-duration gamma-ray bursts are the most luminous sources of electromagnetic radiation known. Since their progenitors are massive stars, they provide a tracer... 相似文献
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Rosati P. Basa S. Blain A. W. Bozzo E. Branchesi M. Christensen L. Ferrara A. Gomboc A. O’Brien P. T. Osborne J. P. Rossi A. Schüssler F. Spurio M. Stergioulas N. Stratta G. Amati L. Casewell S. Ciolfi R. Ghirlanda G. Grimm S. Guetta D. Harms J. Le Floc’h E. Longo F. Maggiore M. Mereghetti S. Oganesyan G. Salvaterra R. Tanvir N. R. Turriziani S. Vergani S. D. Balman S. Caruana J. Erkut M. H. Guidorzi G. Frontera F. Martin-Carrillo A. Paltani S. Porquet D. Sergijenko O. 《Experimental Astronomy》2021,52(3):407-437
Experimental Astronomy - The proposed THESEUS mission will vastly expand the capabilities to monitor the high-energy sky. It will specifically exploit large samples of gamma-ray bursts to probe the... 相似文献
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