X-RAY EMISSION AND ABSORPTION FEATURES DURING AN ENERGETIC THERMONUCLEAR X-RAY BURST FROM IGR J17062-6143

被引：51

作者：

Degenaar, N. ^{[1
]}

Miller, J. M. ^{[1
]}

Wijnands, R. ^{[2
]}

Altamirano, D. ^{[2
]}

Fabian, A. C. ^{[3
]}

机构：

[1] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[2] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1090 GE Amsterdam, Netherlands

[3] Univ Cambridge, Inst Astron, Cambridge CB3 OHA, England

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 767卷 / 02期

基金：

欧洲研究理事会;

关键词：

accretion; accretion disks; stars: neutron; X-rays: binaries; X-rays: individual (IGR J17062-6143); ACCRETION DISK; OSCILLATIONS; CANDIDATE;

D O I：

10.1088/2041-8205/767/2/L37

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Type-I X-ray bursts are thermonuclear explosions occurring in the surface layers of accreting neutron stars. These events are powerful probes of the physics of neutron stars and their surrounding accretion flow. We analyze a very energetic type-I X-ray burst from the neutron star low-mass X-ray binary IGR J17062-6143 that was detected with Swift on 2012 June 25. The light curve of the similar or equal to 18 minute long X-ray burst tail shows an episode of similar or equal to 10 minutes during which the intensity is strongly fluctuating by a factor of similar or equal to 3 above and below the underlying decay trend on a timescale of seconds. The X-ray spectrum reveals a highly significant emission line around similar or equal to 1 keV, which can be interpreted as an Fe-L shell line caused by the irradiation of cold gas. We also detect significant absorption lines and edges in the Fe-K band, which are strongly suggestive of the presence of hot, highly ionized gas along the line of sight. None of these features are present in the persistent X-ray spectrum of the source. The timescale of the strong intensity variations, the velocity width of the Fe-L emission line ( assuming Keplerian motion), and photoionization modeling of the Fe-K absorption features each independently point to gas at a radius of similar or equal to 10(3) km as the source of these features. The unusual X-ray light curve and spectral properties could have plausibly been caused by a disruption of the accretion disk due to the super-Eddington fluxes reached during the X-ray burst.

引用

页数：6

共 35 条

[1] A superburst candidate in EXO 1745-248 as a challenge to thermonuclear ignition models [J].

Altamirano, D. ;

Keek, L. ;

Cumming, A. ;

Sivakoff, G. R. ;

Heinke, C. O. ;

Wijnands, R. ;

Degenaar, N. ;

Homan, J. ;

Pooley, D. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 426 (02) :927-934

[2]

Arnaud KA, 1996, ASTR SOC P, V101, P17

[3] On the dynamics of suddenly heated accretion disks around neutron stars [J].

Ballantyne, DR ;

Everett, JE .

ASTROPHYSICAL JOURNAL, 2005, 626 (01) :364-372

[4] The evolution of the accretion disk around 4U 1820-30 during a superburst [J].

Ballantyne, DR ;

Strohmayer, TE .

ASTROPHYSICAL JOURNAL, 2004, 602 (02) :L105-L108

[5] The burst alert telescope (BAT) on the Swift MIDEX mission [J].

Barthelmy, SD ;

Barbier, LM ;

Cummings, JR ;

Fenimore, EE ;

Gehrels, N ;

Hullinger, D ;

Krimm, HA ;

Markwardt, CB ;

Palmer, DM ;

Parsons, A ;

Sato, G ;

Suzuki, M ;

Takahashi, T ;

Tashiro, M ;

Tueller, J .

SPACE SCIENCE REVIEWS, 2005, 120 (3-4) :143-164

[6] The Swift X-ray telescope [J].

Burrows, DN ;

Hill, JE ;

Nousek, JA ;

Kennea, JA ;

Wells, A ;

Osborne, JP ;

Abbey, AF ;

Beardmore, A ;

Mukerjee, K ;

Short, ADT ;

Chincarini, G ;

Campana, S ;

Citterio, O ;

Moretti, A ;

Pagani, C ;

Tagliaferri, G ;

Giommi, P ;

Capalbi, M ;

Tamburelli, F ;

Angelini, L ;

Cusumano, G ;

Bräuninger, HW ;

Burkert, W ;

Hartner, GD .

SPACE SCIENCE REVIEWS, 2005, 120 (3-4) :165-195

[7] IMPLICATIONS OF BURST OSCILLATIONS FROM THE SLOWLY ROTATING ACCRETING PULSAR IGR J17480-2446 IN THE GLOBULAR CLUSTER TERZAN 5 [J].

Cavecchi, Y. ;

Patruno, A. ;

Haskell, B. ;

Watts, A. L. ;

Levin, Y. ;

Linares, M. ;

Altamirano, D. ;

Wijnands, R. ;

van der Klis, M. .

ASTROPHYSICAL JOURNAL LETTERS, 2011, 740 (01)

[8] The 2008 outburst of IGR J17473-2721: evidence for a disk corona? [J].

Chen, Y. -P. ;

Zhang, S. ;

Torres, D. F. ;

Zhang, S. -N. ;

Li, J. ;

Kretschmar, P. ;

Wang, J. -M. .

ASTRONOMY & ASTROPHYSICS, 2011, 534

[9] INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth [J].

Churazov, E. ;

Sunyaev, R. ;

Revnivtsev, M. ;

Sazonov, S. ;

Molkov, S. ;

Grebenev, S. ;

Winkler, C. ;

Parmar, A. ;

Bazzano, A. ;

Falanga, M. ;

Gros, A. ;

Lebrun, F. ;

Natalucci, L. ;

Ubertini, P. ;

Roques, J.-P. ;

Bouchet, L. ;

Jourdain, E. ;

Knoedlseder, J. ;

Diehl, R. ;

Budtz-Jorgensen, C. ;

Brandt, S. ;

Lund, N. ;

Westergaard, N. J. ;

Neronov, A. ;

Tuerler, M. ;

Chernyakova, M. ;

Walter, R. ;

Produit, N. ;

Mowlavi, N. ;

Mas-Hesse, J. M. ;

Domingo, A. ;

Gehrels, N. ;

Kuulkers, E. ;

Kretschmar, P. ;

Schmidt, M. .

ASTRONOMY & ASTROPHYSICS, 2007, 467 (02) :529-540

[10] A DISK-REFLECTED COMPONENT IN THE SPECTRA OF X-RAY BURSTERS [J].

DAY, CSR ;

DONE, C .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 253 (03) :P35-P38

← 1 2 3 4 →