WIDE-BAND SUZAKU ANALYSIS OF THE PERSISTENT EMISSION FROM SGR 0501+4516 DURING THE 2008 OUTBURST

Journal Article · Thu May 20 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/715/1/665· OSTI ID:21448723

Enoto, T; Makishima, K; Nakazawa, K; Yamada, S ^[1]; Rea, N ^[2]; Nakagawa, Y E ^[3]; Sakamoto, T ^[4]; Esposito, P; Mereghetti, S; Tiengo, A ^[5]; Goetz, D ^[6]; Hurley, K ^[7]; Israel, G L; Stella, L ^[8]; Kokubun, M ^[9]; Murakami, H ^[10]; Turolla, R ^[11]; Yamaoka, K; Yoshida, A ^[12]; Zane, S ^[13]

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1. Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
2. Institut de Ciencies de l'Espai (ICE-CSIC, IEEC), Campus UAB, Facultat de Ciencies, Torre C5-parell, 2a planta, 08193 Bellaterra, Barcelona (Spain)
3. Cosmic Radiation Laboratory, Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198 (Japan)
4. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
5. INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica-Milano, via E. Bassini 15, 20133 Milano (Italy)
6. CEA Saclay, DSM/Irfu/Service d'Astrophysique, Orme des Merisiers, Bat. 709, 91191 Gif sur Yvette (France)
7. Space Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720-7450 (United States)
8. INAF-Astronomical Observatory of Rome, via Frascati 3300040 Monteporzio Catone (Italy)
9. Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510 (Japan)
10. Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501 (Japan)
11. Department of Physics, University of Padua, via Marzolo 8, 35131 Padova (Italy)
12. Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara, Kanagawa 229-8558 (Japan)
13. MSSL, University College London, Holmbury St. Mary, Dorking Surrey, RH5 6NT (United Kingdom)

We observed the soft gamma repeater SGR 0501+4516 with Suzaku for {approx}51 ks on 2008 August 26-27, about 4 days after its discovery. Following the first paper, which reported on the persistent soft X-ray emission and the wide-band spectrum of an intense short burst, this paper presents an analysis of the persistent broadband (1-70 keV) spectra of this source in outburst, taken with the X-ray Imaging Spectrometer (XIS) and the Hard X-ray Detector (HXD). Pulse-phase folding in the 12-35 keV HXD-PIN data on an ephemeris based on multi-satellite timing measurements at soft X-rays revealed the pulsed signals at {approx_gt}99% confidence in the hard X-ray band. The wide-band spectrum clearly consists of a soft component and a separate hard component, crossing over at {approx}7 keV. When the soft component is modeled by a blackbody plus a Comptonized blackbody, the hard component exhibits a 20-100 keV flux of 4.8{sup +0.8}{sub -0.6}(stat.){sup +0.8}{sub -0.4}(sys.) x 10{sup -11} erg s{sup -1} cm{sup -2} and a photon index of {Gamma} = 0.79{sup +0.20}{sub -0.18}(stat.){sup +0.01}{sub -0.06}(sys.). The hard X-ray data are compared with those obtained by INTEGRAL about 1 day later. Combining the present results with those on other magnetars, we discuss a possible correlation between the spectral hardness of magnetars and their characteristic age and magnetic field strengths.

• OSTI ID: 21448723
• Journal Information: Astrophysical Journal, Vol. 715, Issue 1; Other Information: DOI: 10.1088/0004-637X/715/1/665; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
HARD COMPONENT
HARD X RADIATION
MAGNETIC FIELDS
NEUTRONS
PHOTON EMISSION
PULSARS
SATELLITES
SOFT COMPONENT
SOFT X RADIATION
SPECTROMETERS
STARS
BARYONS
COSMIC RADIATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EMISSION
FERMIONS
HADRONS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
NUCLEONS
RADIATIONS
X RADIATION