Results 21 to 30 of about 10,502,106 (355)

Dark Matter search in dwarf irregular galaxies with the Fermi Large Area Telescope [PDF]

open access: yesInternational Conference on Rebooting Computing, 2021
We analyze 11 years of Fermi-LAT data corresponding to the sky regions of 7 dwarf irregular (dIrr) galaxies. DIrrs are dark matter (DM) dominated systems, proposed as interesting targets for the indirect search of DM with gamma rays.
V. Gammaldi   +7 more
semanticscholar   +1 more source

SPHERE: the exoplanet imager for the Very Large Telescope [PDF]

open access: yesAstronomy & Astrophysics, 2019
Observations of circumstellar environments that look for the direct signal of exoplanets and the scattered light from disks have significant instrumental implications.
J. Beuzit   +20 more
semanticscholar   +1 more source

First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way [PDF]

open access: yes, 2023
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A$^*$), the Galactic center source associated with a supermassive black hole.
K. Akiyama   +387 more
semanticscholar   +1 more source

A 36 cm robotic optical telescope: Equipment and software

open access: yesFrontiers in Astronomy and Space Sciences, 2022
The paper describes an optical telescope system and control software for robotic observation of space debris. The telescope has a main aperture of 355 mm, adopts the optical design scheme of primary focus with a large field of view, and is equipped with ...
Jian Sun   +9 more
doaj   +1 more source

Fermi Large Area Telescope Fourth Source Catalog [PDF]

open access: yesAstrophysical Journal Supplement Series, 2019
We present the fourth Fermi Large Area Telescope catalog (4FGL) of γ-ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest yet in this ...
S. Abdollahi   +167 more
semanticscholar   +1 more source

THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION [PDF]

open access: yes, 2009
The Large Area Telescope (Fermi/LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view (FoV), high-energy γ-ray telescope, covering the energy range from below 20 MeV to more ...
W. Atwood   +239 more
semanticscholar   +1 more source

A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s−1 Mpc−1 Uncertainty from the Hubble Space Telescope and the SH0ES Team [PDF]

open access: yesAstrophysical Journal Letters, 2021
We report observations from the Hubble Space Telescope (HST) of Cepheid variables in the host galaxies of 42 Type Ia supernovae (SNe Ia) used to calibrate the Hubble constant (H 0).
A. Riess   +18 more
semanticscholar   +1 more source

First light for GRAVITY: Phase referencing optical interferometry for the Very Large Telescope Interferometer [PDF]

open access: yes, 2017
GRAVITY is a new instrument to coherently combine the light of the European Southern Observatory Very Large Telescope Interferometer to form a telescope with an equivalent 130 m diameter angular resolution and a collecting area of 200 m2.
G. C. R. Abuter   +131 more
semanticscholar   +1 more source

Observing CVs and LMXBs with SALT: Updates and Recent Results

open access: yesActa Polytechnica CTU Proceedings, 2015
I present an overview of the ongoing observational programs utilizing the Southern African Large Telescope (SALT), focussing on magnetic Cataclysmic Variables and Low Mass X-ray Binaries.
David A. H. Buckley
doaj   +1 more source

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