Results 11 to 20 of about 669,031 (383)

First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass [PDF]

open access: yesAstrophysical Journal Letters, 2022
In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm. We find that the Sgr A* data exhibit variability that exceeds what can be
Event Horizon Telescope Collaboration   +269 more
semanticscholar   +3 more sources

An Overview of Some Latest Development in Chinese Astronomy [PDF]

open access: yesAnais da Academia Brasileira de Ciências, 2021
We present brief highlights and updates on some newer projects, both in operation/construction and in preparation stages, of astronomical research on Mainland China, with an emphasis on those involving international collaborations.
ZHONG WANG, YANCHUN LIANG
doaj   +1 more source

Science with the Einstein Telescope: a comparison of different designs [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2023
The Einstein Telescope (ET), the European project for a third-generation gravitational-wave detector, has a reference configuration based on a triangular shape consisting of three nested detectors with 10 km arms, where each detector has a 'xylophone ...
M. Branchesi   +74 more
semanticscholar   +1 more source

The James Webb Space Telescope Mission [PDF]

open access: yesPublications of the Astronomical Society of the Pacific, 2023
Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4 m.
J. Gardner   +499 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

Astronomy Lab I: Photometric Experiments for Physics Students [PDF]

open access: yesIranian Journal of Astronomy and Astrophysics, 2023
As physics laboratories are an integral part of the physics education across the globe, astronomy laboratories are also a necessary part of the astronomy education.
Reza Rezaei
doaj   +1 more source

Incremental Fermi Large Area Telescope Fourth Source Catalog [PDF]

open access: yesAstrophysical Journal Supplement Series, 2022
We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi Large Area Telescope (LAT) catalog of γ-ray sources. Based on the first 12 years of science data in the energy range from 50 MeV to 1 TeV, it contains 6658 sources.
F. Abdollahi   +138 more
semanticscholar   +1 more source

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

The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance [PDF]

open access: yesPublications of the Astronomical Society of the Pacific, 2023
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science.
M. McElwain   +128 more
semanticscholar   +1 more source

First M87 Event Horizon Telescope Results. VII. Polarization of the Ring [PDF]

open access: yesAstrophysical Journal Letters, 2021
In 2017 April, the Event Horizon Telescope (EHT) observed the near-horizon region around the supermassive black hole at the core of the M87 galaxy. These 1.3 mm wavelength observations revealed a compact asymmetric ring-like source morphology.
K. Akiyama   +238 more
semanticscholar   +1 more source

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