Year: 2015
Type: article
Abstract: We report reanalyses of the Suzaku observations of the Galactic supernova remnant (SNR) G272.2−3.2, for which previous studies were limited below 3 keV. With careful data reduction and background subtraction, we discover the K-shell lines of Ar, Ca, and Fe above 3 keV. The X-ray spectrum of G272.2−3.2 consists of two components, a low-temperature collisional ionization equilibrium (CIE) plasma (kTe ∼ 0.2 keV) and a high-temperature non-equilibrium ionization (NEI) plasma (kTe = 0.6–3 keV). The CIE plasma has solar abundances over the entire area, hence it originates from the interstellar medium. On the other hand, the abundances of the NEI plasma increase toward the inner region, suggesting ejecta origin. The line center energy of the Fe K-shell emission (∼6.4 keV) suggests that the ejecta are recently heated by reverse shock, a common feature in Type Ia SNRs.
DOI: 10.1093/pasj/psv114
Authors: Fumiyoshi Kamitsukasa, Katsuji Koyama, Hiroshi Nakajima, Kiyoshi Hayashida, Koji Mori, Satoru Katsuda, Hiroyuki Uchida, Hiroshi Tsunemi
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G169357587, A New Scenario of the SNR evolution using the Recombining Plasma, Development of high-speed low-noise analog ASIC for high-sensitive cosmic X-ray observation, A Study of Formation Process of SNRs with X-ray Spectrometers, Pioneering high-resolution X-ray spectroscopy of supernova remnants using dispersive spectrometers and the calorimeter onboard ASTRO-H, Development of Wideband X-ray Imaging Polarimeters and Hard X-ray Polarimetry, Verifying the minute and high-sensitive imaging using Hard X-ray TDI Camera, Invention of Multi Image X-ray Intereferometer Module for sub-arcsecond imaging of X-ray sources, Cosmic evolution study by using a combination between the high sensitivity X-ray CCD and the super mirror, Probing the relation between progenitors and maximum brightness for Type Ia supernovae through X-ray and optical observations of supernova remnants, An X-ray study of cosmic ray electrons and positrons from pulsar wind nebulae, Development of wide-band CCD camera for precise imaging-spectroscopy of cosmic hard X-rays, 過電離と重元素の空間分布で解明する重力崩壊型超新星爆発機構の新展開, G8798145052
OpenAlex ID: W1771691328