Light ring and the appearance of matter accreted by black holes
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Light ring and the appearance of matter accreted by black holes. / Cardoso, Vitor; Duque, Francisco; Foschi, Arianna.
I: Physical Review D, Bind 103, Nr. 10, 104044, 19.05.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Light ring and the appearance of matter accreted by black holes
AU - Cardoso, Vitor
AU - Duque, Francisco
AU - Foschi, Arianna
PY - 2021/5/19
Y1 - 2021/5/19
N2 - The geometry of black hole spacetimes can be probed with exquisite precision in the gravitational-wave window, and possibly also in the optical regime. We study the accretion of bright spots-objects which emit strongly in the optical or in gravitational waves-by nonspinning black holes. As the object approaches the event horizon, the emitted radiation to far-away distances is dominated by photons or gravitons orbiting the light ring, causing the total luminosity to decrease exponentially as L-o similar to e(-t/(3 root 3M)). Late-time radiation is blueshifted, due to its having been emitted during the infall, trapped at the light ring and subsequently reemitted. These universal properties are a clear signature of the existence of light rings in the spacetime, and not particularly sensitive to near horizon details.
AB - The geometry of black hole spacetimes can be probed with exquisite precision in the gravitational-wave window, and possibly also in the optical regime. We study the accretion of bright spots-objects which emit strongly in the optical or in gravitational waves-by nonspinning black holes. As the object approaches the event horizon, the emitted radiation to far-away distances is dominated by photons or gravitons orbiting the light ring, causing the total luminosity to decrease exponentially as L-o similar to e(-t/(3 root 3M)). Late-time radiation is blueshifted, due to its having been emitted during the infall, trapped at the light ring and subsequently reemitted. These universal properties are a clear signature of the existence of light rings in the spacetime, and not particularly sensitive to near horizon details.
KW - OPTICAL APPEARANCE
KW - STAR
KW - PERTURBATIONS
KW - OBJECTS
KW - SHADOW
KW - FIELD
U2 - 10.1103/PhysRevD.103.104044
DO - 10.1103/PhysRevD.103.104044
M3 - Journal article
VL - 103
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 10
M1 - 104044
ER -
ID: 298632975