Results 31 to 40 of about 148,127 (281)

Quasar Black Hole Mass Estimates in the Era of Time Domain Astronomy [PDF]

, 2013
We investigate the dependence of the normalization of the high-frequency part of the X-ray and optical power spectral densities (PSD) on black hole mass for a sample of 39 active galactic nuclei (AGN) with black hole masses estimated from reverberation ...
Kelly, Brandon C., Malkan, Matthew, Pancoast, Anna, Treu, Tommaso, Woo, Jong-Hak   +4 more
core   +3 more sources

Time domain astronomy from Dome C: results from ASTEP [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractASTEP (Antarctic Search for Transiting Exo Planets) is a research program funded mainly by French ANR grants and by the French Polar Institute (IPEV), dedicated to the photometric study of exoplanetary transits from Antarctica.The preliminary “pathfinder” instrument ASTEP–South is described in another communication (Crouzet et al., these ...
Rivet, J, Abe, L, Agabi, K, Barbieri, M, Crouzet, N, Goncalves, I, Guillot, T, Mekarnia, D, Szulagyi, J, Daban, J, Gouvret, C, Fantei-Caujolle, Y, Schmider, F, Furth, T, Erikson, A, Rauer, H, Fressin, F, Alapini, A, Pont, F, Aigrain, S   +19 more
openaire   +2 more sources

The Catalina Real-time Transient Survey [PDF]

, 2011
The Catalina Real-time Transient Survey (CRTS) currently covers 33,000 deg^2 of the sky in search of transient astrophysical events, with time baselines ranging from 10 minutes to ~7 years.
Beshore, E., Catalan, M., Christensen, E., Djorgovski, S. G., Donalek, C., Drake, A. J., Graham, M. J., Larson, S., Mahabal, A., Prieto, J. L., Williams, R.   +10 more
core   +3 more sources

Time domain astronomy with Swift and Fermi

Rwanda Journal, 2016
Swift and Fermi are unveiling an unexpectedly rich tapestry of behavior in the transient γ−ray sky. Sources which were already known to be transient − such as pulsars, gamma-ray bursts, and blazars − have been studied in ever-increasing detail. For example, Fermi/LAT has detected 117 pulsars of which 56 are new.
Gehrels, N, Cannizzo, J.K.
openaire   +3 more sources

Time Domain Methods for X-Ray and Gamma-Ray Astronomy

, 2022
26 pages, 9 figures. To appear in Handbook for X-ray and Gamma-Ray Astrophysics, Volume 4: Analysis techniques, Section XVIII: Timing Analysis (Belloni & Bhattacharya, eds., Springer)
Feigelson, Eric D., Kashyap, Vinay L., Siemiginowska, Aneta   +2 more
openaire   +2 more sources

FERMI GBM CAPABILITIES FOR MULTI-MESSENGER TIME-DOMAIN ASTRONOMY [PDF]

EAS Publications Series, 2013
Owing to its wide sky coverage and broad energy range, the Fermi Gamma-ray Burst Monitor (GBM) is an excellent observer of the transient hard X-ray sky. GBM detects about 240 triggered Gamma-Ray Bursts (GRBs) per year, including over 30 which also trigger the Swift Burst Alert Telescope (BAT).
V. Connaughton, V. Pelassa, M.S. Briggs, P. Jenke, E. Troja, J.E. McEnery, L. Blackburn   +6 more
openaire   +1 more source

Citizen Science Time Domain Astronomy with Astro-COLIBRI

, 2023
Astro-COLIBRI is an innovative tool designed for professional astronomers to facilitate the study of transient astronomical events. Transient events - such as supernovae, gamma-ray bursts and stellar mergers - are fleeting cataclysmic phenomena that can offer profound insights into the most violent processes in the universe.
Schüssler, Fabian, de Lavergne, M. de Bony, Alkan, A. Kaan, Mourier, J., Reichherzer, P.   +4 more
openaire   +2 more sources

Revisiting the Milky Way stellar long bar and the 3 kpc arm★

Astronomy & Astrophysics
Context. One of the most difficult and unexplored regions of the Milky Way is the highly extincted in-plane central region within the Galactic coordinates 10◦ ≲ |ℓ| ≲ 30◦, |b| ≲ 3◦, where we have the long-bar and 3 kpc arm with intermediate-age stellar ...
López-Corredoira M., Wu W., Wang H.-F., Garzón F.   +3 more
doaj   +1 more source

SkyDOT (Sky Database for Objects in the Time Domain): A Virtual Observatory for Variability Studies at LANL

, 2002
The mining of Virtual Observatories (VOs) is becoming a powerful new method for discovery in astronomy. Here we report on the development of SkyDOT (Sky Database for Objects in the Time domain), a new Virtual Observatory, which is dedicated to the study ...
Borozdin, K., Galassi, M., Priedhorsky, W., Starr, D., Vestrand, W. T., White, R., Wozniak, P., Wren, J.   +7 more
core   +2 more sources

Multiwavelength Evidence for Two New Candidate Transitional Millisecond Pulsars in the Subluminous Disk State: 4FGL J0639.1-8009 and 4FGL J1824.2+1231

The Astrophysical Journal
We report the discovery of two new Galactic accreting compact objects consistent with the respective positions of the unassociated Fermi-LAT γ -ray sources 4FGL J0639.1-8009 and 4FGL J1824.2+1231. A combination of new and archival X-ray data from Chandra,
Rebecca Kyer, Subhroja Roy, Jay Strader, Ryan Urquhart, Isabella Molina, Peter Craig, Laura Chomiuk   +6 more
doaj   +1 more source