Results 21 to 30 of about 34,279 (294)

RoboPol: Connection between optical polarization plane rotations and gamma-ray flares in blazars [PDF]

, 2017
We use results of our 3 year polarimetric monitoring program to investigate the previously suggested connection between rotations of the polarization plane in the optical emission of blazars and their gamma-ray flares in the GeV band. The homogeneous set
Angelakis, E., Baloković, M., Blinov, D., Hovatta, T., Kiehlmann, S., King, O. G., Kus, A., Kylafis, N., Liodakis, I., Mahabal, A., Maharana, S., Myserlis, I., Paleologou, E., Panopoulou, G. V., Papadakis, I., Papamastorakis, I., Pavlidou, V., Pazderski, E., Pearson, T. J., Ramaprakash, A., Readhead, A. C. S., Reig, P., Tassis, K., Zensus, J. A.   +23 more
core   +3 more sources

Optical and Ultraviolet Stellar Flare Spectroscopy [PDF]

International Astronomical Union Colloquium, 1983
As for solar flares, one of the most physically revealing types of data for M-dwarf flares are high-resolution, time-resolved spectra. Due to the intrinsically faint nature of the M-dwarf stars, spectroscopic data has tended to be of low spectral (˜ 5 Ǻ) and temporal (˜ 5 min) resolution. However, with the development of image intensified spectrographs
openaire   +1 more source

THE OPTICAL DEPTH OF WHITE-LIGHT FLARE CONTINUUM [PDF]

The Astrophysical Journal, 2010
The white-light continuum emission of a solar flare remains a puzzle as regards its height of formation and its emission mechanism(s). This continuum, and its extension into the near UV, contain the bulk of the energy radiated by a flare, and so its explanation is a high priority.
Potts, Hugh, Hudson, Hugh, Fletcher, Lyndsay, Diver, Declan   +3 more
openaire   +2 more sources

Statistical Signatures of Nanoflare Activity. III. Evidence of Enhanced Nanoflaring Rates in Fully Convective stars as Observed by the NGTS

The Astrophysical Journal, 2023
Previous examinations of fully convective M-dwarf stars have highlighted enhanced rates of nanoflare activity on these distant stellar sources. However, the specific role the convective boundary, which is believed to be present for spectral types earlier
S. D. T. Grant, D. B. Jess, C. J. Dillon, M. Mathioudakis, C. A. Watson, J. A. G. Jackman, D. G. Jackson, P. J. Wheatley, M. R. Goad, S. L. Casewell, D. R. Anderson, M. R. Burleigh, R. G. West, J. I. Vines   +13 more
doaj   +1 more source

Optical and Radio monitoring of S5 1803+74 [PDF]

, 2002
The optical (BVRI) and radio (8.4 GHz) light curves of S5 1803+784 on a time span of nearly 6 years are presented and discussed. The optical light curve showed an overall variation greater than 3 mag, and the largest changes occured in three strong ...
Bertaud C., D. Dallacasa, E. Massaro, F. D’Alessio, F. Montagni, Ghisellini G., Giommi P., Heidt J., Kidger M., M. Maesano, Massaro E., Massaro E., Mead A. R. G., Nesci R., R. Nesci, S. Sclavi, T. Venturi, Teraesranta H., Wagner S. J.   +18 more
core   +3 more sources

A 7 Day Multiwavelength Flare Campaign on AU Mic. I. High-time-resolution Light Curves and the Thermal Empirical Neupert Effect

The Astrophysical Journal, 2023
We present light curves and flares from a 7 day, multiwavelength observational campaign of AU Mic, a young and active dM1e star with exoplanets and a debris disk. We report on 73 unique flares between the X-ray to optical data.
Isaiah I. Tristan, Yuta Notsu, Adam F. Kowalski, Alexander Brown, John P. Wisniewski, Rachel A. Osten, Eliot H. Vrijmoet, Graeme L. White, Brad D. Carter, Carol A. Grady, Todd J. Henry, Rodrigo H. Hinojosa, Jamie R. Lomax, James E. Neff, Leonardo A. Paredes, Jack Soutter   +15 more
doaj   +1 more source

Flares from the Tidal Disruption of Stars by Massive Black Holes [PDF]

, 1997
Tidal disruption flares are differentiated into two classes -- those which are sub-Eddington and those which radiate near the Eddington limit. Flares from black holes above ~2 x 10^7 M_\odot will generally not radiate above the Eddington limit.
Ulmer, Andrew
core   +3 more sources

On Impulsive and Gradual Optical Solar Flares [PDF]

International Astronomical Union Colloquium, 1989
AbstractA comparative study of H-alpha intensity and area development of several flares is presented in an attempt to investigate characteristic features of various types of optical solar flares.
A. Bhatnagar, A. Ambastha, R.M. Jain, N. Srivastava   +3 more
openaire   +1 more source

Correlated optical, X-ray, and $-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni [PDF]

, 2015
Reproduced with permission from Astronomy & Astrophysics. © 2015 ESO.After 25 years of quiescence, the microquasar V404 Cyg entered a new period of activity in June 2015.
A. Domingo, A. Loh, Barthelmy, C. Gouiffès, Casares, Corbel, D. M. Russell, Domingo, Fender, Ferrigno, Greiner, Hjellming, Hynes, J. A. Tomsick, J. Alfonso-Garzón, J. C. A. Miller-Jones, J. Chenevez, J. Greiner, J. M. Mas-Hesse, J. Rodriguez, J. Wilms, Joinet, Khargharia, Kuulkers, M. Cadolle Bel, M. Clavel, M. G. H. Krause, Maccarone, Makino, Miller-Jones, Mirabel, Mooley, Motta, Munoz-Darias, Negoro, P. Laurent, R. Diehl, Remillard, Richter, Rodriguez, Rodriguez, Rodriguez, Rodriguez, Russell, S. Corbel, S. Markoff, Shahbaz, Sivakoff, Strong, T. Siegert, Terada, Tetarenko, Tetarenko, Tomsick, Tsubono, V. Grinberg, V. Savchenko, van der Laan, Winkler, X.-L. Zhang, Xie, Życki   +61 more
core   +15 more sources

Swift and Fermi observations of X-ray flares: the case of Late Internal Shock [PDF]

, 2014
Simultaneous Swift and Fermi observations of gamma-ray bursts (GRBs) offer a unique broadband view of their afterglow emission, spanning more than ten decades in energy.
Burgess, J. M., Connaughton, V., Cutini, S., McEnery, J. E., Omodei, N., Piro, L., Troja, E., Vasileiou, V.   +7 more
core   +4 more sources