Sub-MeV band observation of a hard burst from AXP 1E 1547.0−5408 with the Suzaku Wide-band All-sky Monitor

Yasuda, Tetsuya; Iwakiri, W.; Tashiro, M.; Terada, Y.; Kouzu, Tomomi; Enoto, T.; Nakagawa, Y. E.; Bamba, Aya; Urata, Y.; Yamaoka, K.; Ohno, M.; Shibata, Shinpei; Makishima, Kazuo

doi:10.1093/pasj/psv011

Cited by 4 publications

(1 citation statement)

References 43 publications

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“…SGR 1806−20 [99,258]) and short bursts (e.g. 1E 1547.0−5408 [850]) showed radiation in the MeV range, being consistent with a continuous Locations of the known magnetars in the Galactic coordinates [222,227] with the centre of our Galaxy at the origin of this plot. Some constellations are also overlaid.…”

Section: Magnetars (Sgrs and Axps)supporting

confidence: 85%

Observational diversity of magnetized neutron stars

2019

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Young and rotation-powered neutron stars (NSs) are commonly observed as rapidly-spinning pulsars. They dissipate their rotational energy by emitting pulsar wind with electromagnetic radiation and spin down at a steady rate, according to the simple steadily-rotating magnetic dipole model. In reality, however, multiwavelength observations of radiation from the NS surface and magnetosphere have revealed that the evolution and properties of NSs are highly diverse, often dubbed as 'NS zoo'. In particular, many of young and highly magnetized NSs show a high degree of activities, such as sporadic electromagnetic outbursts and irregular changes in pulse arrival times. Importantly, their magnetic field, which are the strongest in the universe, makes them ideal laboratories for fundamental physics. A class of highly-magnetized isolated NSs is empirically divided into several subclasses. In a broad classification, they are, in the order of the magnetic field strength (B) from the highest, 'magnetars' (historically recognized as soft gamma-ray repeaters and/or anomalous x-ray pulsars), 'high-B pulsars', and (nearby) x-ray isolated NSs. This article presents an introductory review for nonastrophysicists about the observational properties of highly-magnetized NSs, and their implications. The observed dynamic nature of NSs must be interpreted in conjunction with transient magnetic activities triggered during magnetic-energy dissipation process. In particular, we focus on how the five fundamental quantities of NSs, i.e. mass, radius, spin period, surface temperature, and magnetic fields, as observed with modern instruments, change with evolution of, and vary depending on the class of, the NSs. They are the foundation for a future unified theory of NSs.

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Section: Magnetars (Sgrs and Axps)supporting

confidence: 85%

Observational diversity of magnetized neutron stars

2019

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Hard X-ray spectral investigations of gamma-ray bursts 120521C and 130606A at high-redshift z ∼ 6

Yasuda

Urata

Enomoto

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Suzaku Wide-band All-sky Monitor (WAM) observations of GRBs and SGRs

Yamaoka

Ohno

Tashiro

et al. 2017

Publications of the Astronomical Society of Japan

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We will review results for gamma-ray bursts (GRBs) and soft gamma repeaters (SGRs), obtained from the Suzaku Wide-band All-sky Monitor (WAM) which operated for about 10 years from 2005 to 2015. The WAM is a BGO (bismuth germanate: Bi4Ge3O12) lateral shield for the Hard X-ray Detector (HXD), used mainly for rejecting its detector background, but it also works as an all-sky monitor for soft gamma-ray transients in the 50–5000 keV range thanks to its large effective area (∼600 cm2 at 1 MeV for one detector) and wide field of view (about half of the entire sky). The WAM actually detected more than 1400 GRBs and 300 bursts from SGRs, and this detection number is comparable to that of other GRB-specific instruments. Based on the 10 years of operation, we describe timing and spectral performance for short GRBs, weak GRBs with high redshifts, and time-resolved pulses with good statistics.

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Sub-MeV band observation of a hard burst from AXP 1E 1547.0−5408 with the Suzaku Wide-band All-sky Monitor

Cited by 4 publications

References 43 publications

Observational diversity of magnetized neutron stars

Observational diversity of magnetized neutron stars

Hard X-ray spectral investigations of gamma-ray bursts 120521C and 130606A at high-redshift z ∼ 6

Suzaku Wide-band All-sky Monitor (WAM) observations of GRBs and SGRs

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