Horizonless Spacetimes As Seen by Present and Next-generation Event Horizon Telescope Arrays

被引：13

作者：

Eichhorn, Astrid ^{[1
]}

Gold, Roman ^{[1
]}

Held, Aaron ^{[2
,3
]}

机构：

[1] Univ Southern Denmark, CP3 Origins, Campusvej 55, DK-5230 Odense M, Denmark

[2] Friedrich Schiller Univ Jena, Theoret Phys Inst, Max Wien Pl 1, D-07743 Jena, Germany

[3] Princeton Univ, Princeton Grav Initiat, Jadwin Hall, Princeton, NJ 08544 USA

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 950卷 / 02期

关键词：

BLACK-HOLE; PHOTON-RING; IMAGE; MASS; M87;

D O I：

10.3847/1538-4357/accced

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the capabilities of present and future radio very long baseline interferometry arrays to distinguish black holes from horizonless spacetimes. We consider an example of a horizonless spacetime, obtained by overspinning a regular black hole. Its image is distinct from the image of a Kerr spacetime due to a second set of photon rings interior to the shadow. These photon rings cannot be directly resolved by present and even next-generation Event Horizon Telescope arrays, but instead imprint themselves in horizon-scale images as excess central brightness relative to that of a black hole. We demonstrate that future arrays can decrease the upper bound on the central brightness depression by a factor of 10 and thereby detect such indirect imprints from non-Kerr spacetimes in reconstructed images.

引用

页数：9

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