English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/179938
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole

AuthorsThe Event Horizon Telescope Collaboration; Alberdi, Antxón ; Gómez Fernández, J. L.
KeywordsBlack hole physics
Galaxies: individual (M87)
Galaxies: jets
Techniques: high angular resolution
Techniques: interferometric
Techniques: image processing
Issue Date10-Apr-2019
PublisherInstitute of Physics Publishing
American Astronomical Society
CitationAstrophysical Journal Letters 875(1): L4 (2019)
AbstractWe present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to avoid shared human bias and to assess common features among independent reconstructions. In the second stage, we reconstructed synthetic data from a large survey of imaging parameters and then compared the results with the corresponding ground truth images. This stage allowed us to select parameters objectively to use when reconstructing images of M87. Across all tests in both stages, the ring diameter and asymmetry remained stable, insensitive to the choice of imaging technique. We describe the EHT imaging procedures, the primary image features in M87, and the dependence of these features on imaging assumptions.© 2019. The American Astronomical Society.
Publisher version (URL)http://dx.doi.org/10.3847/2041-8213/ab0e85
URIhttp://hdl.handle.net/10261/179938
DOI10.3847/2041-8213/ab0e85
ISSN2041-8205
E-ISSN2041-8213
Appears in Collections:(IAA) Artículos
Files in This Item:
File Description SizeFormat 
IAA_2019_The_Event_Horizon_Telescope_Collaboration_2019_ApJL_875_L4.pdf20,81 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.