NICER Observes the Effects of an X-Ray Burst on the Accretion Environment in Aql X-1

被引：36

作者：

Keek, L. ^{[1
]}

Arzoumanian, Z. ^{[2
]}

Bult, P. ^{[2
]}

Cackett, E. M. ^{[3
]}

Chakrabarty, D. ^{[4
]}

Chenevez, J. ^{[5
]}

Fabian, A. C. ^{[6
]}

Gendreau, K. C. ^{[2
]}

Guillot, S. ^{[7
,8
,9
]}

Guver, T. ^{[10
,11
]}

Homan, J. ^{[12
,13
]}

Jaisawal, G. K. ^{[5
]}

Lamb, F. K. ^{[14
,15
,16
]}

Ludlam, R. M. ^{[17
]}

Mahmoodifar, S. ^{[2
]}

Markwardt, C. B. ^{[2
]}

Miller, J. M. ^{[17
]}

Prigozhin, G. ^{[4
]}

Soong, Y. ^{[1
,2
]}

Strohmayer, T. E. ^{[2
]}

Wolff, M. T. ^{[18
]}

机构：

[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[2] NASA, Xray Astrophys Lab, Astrophys Sci Div, GSFC, Greenbelt, MD 20771 USA

[3] Wayne State Univ, Dept Phys & Astron, 666 W Hancock St, Detroit, MI 48201 USA

[4] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[5] Tech Univ Denmark, Natl Space Inst, Elektrovej 327-328, DK-2800 Lyngby, Denmark

[6] Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[7] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[8] CNRS, IRAP, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France

[9] Univ Toulouse, CNES, UPS, OMP, F-31028 Toulouse, France

[10] Istanbul Univ, Sci Fac, Dept Astron & Space Sci, TR-34119 Istanbul, Turkey

[11] Istanbul Univ, Observ Res & Applicat Ctr, TR-34119 Istanbul, Turkey

[12] Eureka Sci Inc, 2452 Delmer St, Oakland, CA 94602 USA

[13] SRON, Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands

[14] Univ Illinois, Ctr Theoret Astrophys, 1110 West Green St, Urbana, IL 61801 USA

[15] Univ Illinois, Dept Phys, 1110 West Green St, Urbana, IL 61801 USA

[16] Univ Illinois, Dept Astron, 1002 West Green St, Urbana, IL 61801 USA

[17] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA

[18] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 855卷 / 01期

关键词：

accretion; accretion disks; stars: individual (Aql X-1); stars: neutron; X-rays: binaries; X-rays: bursts; TIMING-EXPLORER; AQUILA X-1; SPECTRAL EVOLUTION; NEUTRON-STARS; OUTBURST; DISK; CALIBRATION; PERSISTENT; ABSORPTION; EMISSION;

D O I：

10.3847/2041-8213/aab104

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Accretion disks around neutron stars regularly undergo sudden strong irradiation by Type-I X-ray bursts powered by unstable thermonuclear burning on the stellar surface. We investigate the impact on the disk during one of the first X-ray burst observations with the Neutron Star Interior Composition Explorer (NICER) on the International Space Station. The burst is seen from Aql X-1 during the hard spectral state. In addition to thermal emission from the neutron star, the burst spectrum exhibits an excess of soft X-ray photons below 1 keV, where NICER's sensitivity peaks. We interpret the excess as a combination of reprocessing by the strongly photoionized disk and enhancement of the pre-burst persistent flux, possibly due to Poynting-Robertson drag or coronal reprocessing. This is the first such detection for a short sub-Eddington burst. As these bursts are observed frequently, NICER will be able to study how X-ray bursts affect the disk and corona for a range of accreting neutron star systems and disk states.

引用

页数：6

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