Suzaku Observations of Tycho's Supernova Remnant

Authors :: Stephen S. Holt
Jun Kataoka
Toru Tamagawa
John P. Hughes
Junko S. Hiraga
S. Nakamura
Una Hwang
M. Ueno
Hiroshi Tsunemi
Asami Hayato
K. Kinugasa
Motohide Kokubun
Daisuke Ueno
Kazuo Makishima
Aya Bamba
Emi Miyata
Keisuke Tamura
Takaaki Tanaka
Hideyo Kunieda
Andrew Szymkowiak
Yukikatsu Terada
Tadayuki Takahashi
Source :: Scopus-Elsevier
Publication Year :: 2008
Publisher :: arXiv, 2008.
Abstract: Tycho's supernova remnant was observed by the XIS and HXD instruments onboard the Suzaku satellite on 2006 June 26-29 for 92 ks. The spectrum up to 30 keV was well fitted with a two-component model, consisting of a power-law with photon index of 2.7 and a thermal bremsstrahlung model with temperature of 4.7 keV. The former component can alternatively be modeled as synchrotron emission from a population of relativistic electrons with an estimated roll-off energy of around 1 keV. In the XIS spectra, in addition to the prominent Fe K_alpha line (6.445 keV), we observe for the first time significant K_alpha line emission from the trace species Cr and Mn at energies of 5.48 keV and 5.95 keV, respectively. Faint K_beta lines from Ca (4.56 keV) and Fe (7.11 keV) are also seen. The ionization states of Cr and Mn, based on their line centroids, are estimated to be similar to that of Fe K_alpha (Fe XV or XVI).<br />Comment: 11 pages, 8 figures, accepted by PASJ