Results 31 to 40 of about 16,605,004 (178)
The Astrophysical JournalWe 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 +6 more
doaj +1 more source
Pavo: Discovery of a Star-forming Dwarf Galaxy Just Outside the Local Group
The Astrophysical Journal Letters, 2023 We report the discovery of Pavo, a faint ( M _V = −10.0), star-forming, irregular, and extremely isolated dwarf galaxy at D ≈ 2 Mpc. Pavo was identified in Dark Energy Camera Legacy Survey imaging via a novel approach that combines low surface brightness
Michael G. Jones +11 more
doaj +1 more source
PSR J1947−1120: A New Huntsman Millisecond Pulsar Binary
The Astrophysical JournalWe present the discovery of PSR J1947–1120, a new huntsman millisecond pulsar with a red giant companion star in a 10.3 day orbit. This pulsar was found via optical, X-ray, and radio follow-up of the previously unassociated γ -ray source 4FGL J1947.6 ...
Jay Strader +13 more
doaj +1 more source
Kepler Bonus: Light Curves of Kepler Background Sources
The Astronomical Journal, 2023 NASA’s Kepler primary mission observed about 116 deg ^2 in the sky for 3.5 consecutive years to discover Earth-like exoplanets. This mission recorded pixel cutouts, known as target pixel files (TPFs), of over 200,000 targets that were selected to ...
Jorge Martínez-Palomera +2 more
doaj +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 +4 more
openaire +2 more sources
X-Ray Constraints on Wandering Black Holes in Stripped Galaxy Nuclei in the Halo of NGC 5128
The Astrophysical JournalA subset of galaxies have dense nuclei, and when these galaxies are accreted and tidally stripped, the nuclei can masquerade as globular clusters in the halos of large galaxies.
Samuel L. Feyan +8 more
doaj +1 more source
A 2.9 hr Periodic Radio Transient with an Optical Counterpart
The Astrophysical Journal LettersWe present a long-period radio transient (GLEAM-X J0704−37) discovered to have an optical counterpart, consistent with a cool main-sequence star of spectral type M3. The radio periodicity occurs at the longest period yet found, 2.9 hr, and was discovered
N. Hurley-Walker +14 more
doaj +1 more source
Probing the potential high-energy messengers of the anticipated T Coronae Borealis outburst
Astronomy & AstrophysicsT Coronae Borealis (T CrB) is a nearby recurrent nova that is expected to erupt in the near future, offering a unique opportunity to study particle acceleration and high-energy emission from novae in real time. We investigate the production of gamma rays
Petruk O. +6 more
doaj +1 more source
High Energy Time Domain Astronomy with Swift and Beyond
, 2016 Presented on October 3, 2016 at 3:00 p.m. in the Marcus Nanotechnology Building, room 1117Dieter H. Hartmann is a Professor in the Department of Physics and Astronomy at Clemson University.
Hartmann, Dieter H.
core +1 more source
A Late-time Radio Survey of Type Ia-CSM Supernovae with the Very Large Array
The Astrophysical JournalType Ia-CSM supernovae (SNe) are a rare and peculiar subclass of thermonuclear SNe characterized by emission lines of hydrogen or helium, indicative of high-density circumstellar medium (CSM). Their implied mass-loss rates of ∼10 ^−4 –10 ^−1 M _⊙ yr ^−1 (
Olivia Griffith +10 more
doaj +1 more source