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Testing the rotational nature of the supermassive object M87*from the circularity and size of its first image
Fudan Univ, Ctr Field Theory & Particle Phys, Shanghai 200438, Peoples R China;Fudan Univ, Dept Phys, Shanghai 200438, Peoples R China.
Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21A, SE-10691 Stockholm, Sweden;Nordic Inst Theoret Phys NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden;Univ Michigan, Leinweber Ctr Theoret Phys, Dept Phys, Ann Arbor, MI 48109 USA.
Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21A, SE-10691 Stockholm, Sweden;Nordic Inst Theoret Phys NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden;Univ Cambridge, Kavli Inst Cosmol KICC, Madingley Rd, Cambridge CB3 0HA, England;Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics. Nordic Inst Theoret Phys NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden;Univ Amsterdam, Gravitat Astroparticle Phys Amsterdam GRAPPA, Inst Theoret Phys Amsterdam, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands;Univ Amsterdam, Delta Inst Theoret Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands.ORCID iD: 0000-0001-7958-8940
2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, no 4, article id 044057Article in journal (Refereed) Published
Abstract [en]

The Event Horizon Telescope (EHT) collaboration has recently released the first image of a black hole (BH), opening a new window onto tests of general relativity in the strong field regime. In this paper, we derive constraints on the nature of M87* (the supermassive object at the center of the galaxy M87), exploiting the fact that its shadow appears to be highly circular, and using measurements of its angular size. We first consider the simple case where M87* is assumed to be a Kerr BH. We find that the inferred circularity of M87* excludes Kerr BHs with observation angle theta(obs) greater than or similar to 45 degrees for dimensionless rotational parameter 0.95 less than or similar to a(*) <= 1 whereas the observation angle is unbounded for a(*) less than or similar to 0.9. We then consider the possibility that M87* might be a superspinar, i.e., an object described by the Kerr solution and spinning so fast that it violates the Kerr bound by having vertical bar a(*)vertical bar > 1. We find that, within certain regions of parameter space, the inferred circularity and size of the shadow of M87* do not exclude the possibility that this object might be a superspinar.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 4, article id 044057
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-394068DOI: 10.1103/PhysRevD.100.044057ISI: 000483047300008OAI: oai:DiVA.org:uu-394068DiVA, id: diva2:1356739
Funder
Swedish Research Council, 638-2013-8993Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved

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