Probing H0 and resolving AGN disks with ultrafast photon counters

被引：2

作者：

Dalal, Neal ^{[1
]}

Galanis, Marios ^{[1
]}

Gammie, Charles ^{[2
]}

Gralla, Samuel E. ^{[3
]}

Murray, Norman ^{[4
]}

机构：

[1] Perimeter Inst Theoret Phys, 31 Caroline St North, Waterloo, ON N2L 2Y5, Canada

[2] Univ Illinois, Illinois Ctr Adv Studies Universe, Dept Phys, Champaign, IL 61801 USA

[3] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[4] Univ Toronto, Canadian Inst Theoret Astrophys, 60 St George St, Toronto, ON M5S 3H8, Canada

来源：

PHYSICAL REVIEW D | 2024年 / 109卷 / 12期

基金：

美国国家科学基金会;

关键词：

ACTIVE GALACTIC NUCLEI; UX URSAE-MAJORIS; INTENSITY INTERFEROMETRY; BLACK-HOLE; ACCRETION DISK; STELLAR INTERFEROMETER; SPACE-TELESCOPE; PHASE RETRIEVAL; COHERENT BEAMS; TIME DELAYS;

D O I：

10.1103/PhysRevD.109.123029

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Intensity interferometry is a technique developed many decades ago, that has recently enjoyed a renaissance thanks in part to advances in photodetector technology. We investigate the potential for longbaseline optical intensity interferometry to observe bright, active galactic nuclei (AGN) associated with rapidly accreting supermassive black holes. We argue that realistic telescope arrays similar in area to existing Cherenkov arrays, if equipped with modern high-precision single photon detectors, can achieve a sufficiently high signal to noise ratio not only to detect distant AGN, but also to study them in great detail. We explore the science potential of such observations by considering two examples. First, we find that intensity interferometric observations of bright nearby AGN can allow detailed studies of the central accretion disks powering the AGN, allowing reconstruction of many disk properties like the radial profile. Next, we argue that intensity interferometers can spatially resolve the broad-line regions of AGN at cosmological distances, and thereby provide a geometric determination of the angular diameter distances to those AGN when combined with reverberation mapping. Since this measurement can be performed for AGN at distances of hundreds of megaparsecs, this directly measures the Hubble expansion rate H0, with a precision adequate to resolve the recent Hubble tension. Finally, we speculate on future applications that would be enabled by even larger intensity interferometer arrays.

引用

页数：21

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