Results 1 to 10 of about 3,761,627 (366)

The Young Stars in the Galactic Center [PDF]

open access: yesThe Astrophysical Journal Letters, 2022
We present a large ∼30″ × 30″ spectroscopic survey of the Galactic Center using the SINFONI IFU at the VLT. Combining observations of the last two decades we compile spectra of over 2800 stars.
S. V. von Fellenberg   +13 more
semanticscholar   +5 more sources

Search for PeVatrons at the Galactic Center using a radio air-shower array at the South Pole [PDF]

open access: yesEuropean Physical Journal C: Particles and Fields, 2018
The South Pole, which hosts the IceCube Neutrino Observatory, has a complete and around-the-clock exposure to the Galactic Center. Hence, it is an ideal location to search for gamma rays of PeV energy coming from the Galactic Center.
A. Balagopal V.   +3 more
doaj   +2 more sources

First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole [PDF]

open access: yesAstrophysical Journal Letters, 2022
We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a wavelength of 1.3 mm.
Event Horizon Telescope Collaboration   +270 more
semanticscholar   +1 more source

First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole [PDF]

open access: yesAstrophysical Journal Letters, 2022
In this paper we provide a first physical interpretation for the Event Horizon Telescope's (EHT) 2017 observations of Sgr A*. Our main approach is to compare resolved EHT data at 230 GHz and unresolved non-EHT observations from radio to X-ray ...
K. Akiyama   +273 more
semanticscholar   +1 more source

The 1.28 GHz MeerKAT Galactic Center Mosaic [PDF]

open access: yesAstrophysical Journal, 2022
The inner ∼200 pc region of the Galaxy contains a 4 million M⊙ supermassive black hole (SMBH), significant quantities of molecular gas, and star formation and cosmic-ray energy densities that are roughly two orders of magnitude higher than the ...
I. Heywood   +110 more
semanticscholar   +1 more source

Mass distribution in the Galactic Center based on interferometric astrometry of multiple stellar orbits [PDF]

open access: yesAstronomy & Astrophysics, 2021
The stars orbiting the compact radio source Sgr A* in the Galactic Centre are precision probes of the gravitational field around the closest massive black hole.
G. C. R. Abuter   +63 more
semanticscholar   +1 more source

MAGIC observations of the diffuse γ-ray emission in the vicinity of the Galactic center [PDF]

open access: yesAstronomy & Astrophysics, 2020
Aims. In the presence of a sufficient amount of target material, γ-rays can be used as a tracer in the search for sources of Galactic cosmic rays (CRs).
M. Acciari   +273 more
semanticscholar   +1 more source

Near-infrared Flux Distribution of Sgr A* from 2005–2022: Evidence for an Enhanced Accretion Episode in 2019

open access: yesThe Astrophysical Journal Letters, 2023
Sgr A* is the variable electromagnetic source associated with accretion onto the Galactic center supermassive black hole. While the near-infrared (NIR) variability of Sgr A* was shown to be consistent over two decades, unprecedented activity in 2019 ...
Grant C. Weldon   +12 more
doaj   +1 more source

Characteristics of the Galactic Center excess measured with 11 years of Fermi -LAT data

open access: yesPhysical Review D, 2021
The excess of γ rays in the data measured by the Fermi Large Area Telescope from the Galactic center region is one of the most intriguing mysteries in Astroparticle Physics. This “Galactic center excess” (GCE), has been measured with respect to different
M. Di Mauro
semanticscholar   +1 more source

Spurious Point Source Signals in the Galactic Center Excess. [PDF]

open access: yesPhysical Review Letters, 2020
We reexamine evidence that the Galactic Center Excess (GCE) originates primarily from point sources (PSs). We show that in our region of interest, non-Poissonian template fitting evidence for GCE PSs is an artifact of unmodeled north-south asymmetry of ...
R. K. Leane, T. Slatyer
semanticscholar   +1 more source

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