NDLI: Constraining the distribution of dark matter at the Galactic centre using the high-resolution Event Horizon Telescope

Content Provider	EDP Sciences
Author	T. Lacroix J. Silk
Abstract	We investigate constraints on the distribution of dark matter in the neighbourhood of the Galactic centre that may eventually be attained with the high-resolution Event Horizon Telescope (EHT). The shadow of a black hole in vacuum is used to generate a toy model describing how dark matter affects the size of the shadow of the supermassive black hole located at the Galactic centre. Observations by the EHT may constrain the properties of the dark matter distribution in a possible density spike around the black hole. Current uncertainties due to both the resolution of the telescope and the analysis of stellar orbits prevent one from discerning the effect of dark matter on the measured size of the shadow. The change in the size of the shadow induced by dark matter can be seen as an additional uncertainty in any test of general relativity that relies on using the angular size of the shadow to estimate the Schwarzschild radius of the black hole.
Page Count	5
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2013/06/aa20753-12/aa20753-12.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	554
DOI	10.1051/0004-6361/201220753
Language	English
Publisher	EDP Sciences
Publisher Date	2013-06-01
Access Restriction	Open
Rights Holder	© ESO, 2013
Subject Keyword	dark matter Galaxy: center black hole physics dark matter / Galaxy: center / black hole physics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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