A STRONGLY MAGNETIZED PULSAR WITHIN THE GRASP OF THE MILKY WAY'S SUPERMASSIVE BLACK HOLE

被引：98

作者：

Rea, N. ^{[1
]}

Esposito, P. ^{[2
]}

Pons, J. A. ^{[3
]}

Turolla, R. ^{[4
,5
]}

Torres, D. F. ^{[1
,6
]}

Israel, G. L. ^{[7
]}

Possenti, A. ^{[8
]}

Burgay, M. ^{[8
]}

Vigano, D. ^{[3
]}

Papitto, A. ^{[1
]}

Perna, R. ^{[9
]}

Stella, L. ^{[7
]}

Ponti, G. ^{[10
]}

Baganoff, F. K. ^{[11
]}

Haggard, D. ^{[12
]}

Camero-Arranz, A. ^{[1
]}

Zane, S. ^{[5
]}

Minter, A. ^{[13
]}

Mereghetti, S. ^{[2
]}

Tiengo, A. ^{[2
,14
,15
]}

Schoedel, R. ^{[16
]}

Feroci, M. ^{[17
]}

Mignani, R. ^{[2
,5
,18
]}

Goetz, D. ^{[19
]}

机构：

[1] Inst Space Sci CSIC IEEC, Fac Sci, E-08193 Bellaterra, Barcelona, Spain

[2] INAF IASF, I-20133 Milan, Italy

[3] Univ Alicante, Dept Fis Aplicada, E-03080 Alicante, Spain

[4] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy

[5] MSSL UCL, Dorking RH5 6NT, Surrey, England

[6] ICREA, Barcelona, Spain

[7] INAF OAR, I-00040 Monte Porzio Catone, Italy

[8] INAF OAC, I-09012 Capoterra, Italy

[9] Univ Colorado, JILA, Boulder, CO 80309 USA

[10] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[11] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[12] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys, Dept Phys & Astron, Evanston, IL 60208 USA

[13] Natl Radio Astron Observ, Green Bank, WV 24944 USA

[14] IUSS, I-27100 Pavia, Italy

[15] INFN, Sez Pavia, I-27100 Pavia, Italy

[16] CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain

[17] INAF IAPS, I-00133 Rome, Italy

[18] Univ Zielona Gora, PL-65265 Zielona Gora, Poland

[19] AIM CEA DSM CNRS Univ Paris Diderot, Irfu Serv Astrophys, F-91191 Gif Sur Yvette, France

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 775卷 / 02期

关键词：

Galaxy: center; stars: neutron; X-rays: individual (SGR J1745-2900); GALACTIC-CENTER; MOLECULAR CLOUDS; A-ASTERISK; DISCOVERY; SGR-1806-20; CONSTRAINTS; PLANE; DISK; MASS;

D O I：

10.1088/2041-8205/775/2/L34

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The center of our Galaxy hosts a supermassive black hole, Sagittarius (Sgr) A*. Young, massive stars within 0.5 pc of Sgr A* are evidence of an episode of intense star formation near the black hole a few million years ago, which might have left behind a young neutron star traveling deep into Sgr A*'s gravitational potential. On 2013 April 25, a short X-ray burst was observed from the direction of the Galactic center. With a series of observations with the Chandra and the Swift satellites, we pinpoint the associated magnetar at an angular distance of 2.4 +/- 0.3 arcsec from Sgr A*, and refine the source spin period and its derivative (P = 3.7635537(2) s and (P) over dot = 6.61(4) x 10(-12) s s(-1)), confirmed by quasi simultaneous radio observations performed with the Green Bank Telescope and Parkes Radio Telescope, which also constrain a dispersion measure of DM = 1750 +/- 50 pc cm(-3), the highest ever observed for a radio pulsar. We have found that this X-ray source is a young magnetar at approximate to 0.07-2 pc from Sgr A*. Simulations of its possible motion around Sgr A* show that it is likely (similar to 90% probability) in a bound orbit around the black hole. The radiation front produced by the past activity from the magnetar passing through the molecular clouds surrounding the Galactic center region might be responsible for a large fraction of the light echoes observed in the Fe fluorescence features.

引用

页数：7

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