著者

by Carl Darling Buck

出版者

University of Chicago Press

巻号頁・発行日

1955

著者

edited by David Cahan

出版者

University of Chicago Press

巻号頁・発行日

2003

著者

American Eugenics Society

出版者

University of Chicago Press

巻号頁・発行日

1969

著者

edited by Philip L. Kohl Mara Kozelsky and Nachman Ben-Yehuda

出版者

University of Chicago Press

巻号頁・発行日

2007

著者

Robert W. Hodge and Naohiro Ogawa

出版者

University of Chicago Press

巻号頁・発行日

1991

著者

David N. Livingstone

出版者

University of Chicago Press

巻号頁・発行日

2003

著者

Janet Lever

出版者

University of Chicago Press

巻号頁・発行日

1983

著者

Odile Redon Françoise Sabban Silvano Serventi translated by Edward Schneider original drawings by Patricia Glee Smith

出版者

University of Chicago Press

巻号頁・発行日

1998

著者

William H. Schaberg

出版者

University of Chicago Press

巻号頁・発行日

1995

著者

Langdon Winner

出版者

University of Chicago Press

巻号頁・発行日

2020

著者

Joan Bybee Revere Perkins and William Pagliuca

出版者

University of Chicago Press

巻号頁・発行日

1994

著者

Fred Turner

出版者

University of Chicago Press

巻号頁・発行日

2006

著者

Bamba Aya Yamazaki Ryo Yoshida Tatsuo Terasawa Toshio Koyama Katsuji

出版者

University of Chicago Press

雑誌

Astrophysical Journal (ISSN:0004637X)

巻号頁・発行日

vol.621, no.2, pp.793-802, 2005-03

被引用文献数

13 218

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The outer shells of young supernova remnants (SNRs) are the most plausible acceleration sites of high-energy electrons with the diffusive shock acceleration (DSA) mechanism. We studied spatial and spectral properties close to the shock fronts in four historical SNRs (Cas A, Kepler's remnant, Tycho's remnant, and RCW86) with excellent spatial resolution of Chandra. In all of the SNRs, hard X-ray emissions were found on the rims of the SNRs, which concentrate in very narrow regions ( so-called filaments); apparent scale widths on the upstreamside are below or on the order of the point-spread function of Chandra, while they are 0.'' 5 - 40 '' (0.01 - 0.4 pc) on the downstream side with most reliable distances. The spectra of these filaments can be fitted with both thermal and nonthermal ( power law and SRCUT) models. The former requires unrealistic high temperature (greater than or similar to 2 keV) and low abundances (less than or similar to 1 solar) for emission from young SNRs and may be thus unlikely. The latter reproduces the spectra with best-fit photon indices of 2.1 - 3.8, or roll-off frequencies of (0.1 28) x 10(17) Hz, which reminds us of the synchrotron emission from electrons accelerated via DSA. We consider various physical parameters as functions of the SNR age, including the previous results on SN 1006; the filament width on the downstream side increases with the SNR age, and the spectrum becomes softer, keeping a nonthermal feature. It was also found that a function, that is, the roll-off frequency divided by the square of the scale width on the downstream side, shows negative correlation with the age, which might provide us some information on the DSA theory.

著者

David Freedberg

出版者

University of Chicago Press

巻号頁・発行日

1989

著者

Walter Johnson and Francis J. Colligan with a foreword by J. W. Fulbright

出版者

University of Chicago Press

巻号頁・発行日

1965

著者

John A. Rice

出版者

University of Chicago Press

巻号頁・発行日

1998

著者

by Richard T. Hallock

出版者

University of Chicago Press

巻号頁・発行日

1969

著者

Oleg Grabar

出版者

University of Chicago Press

巻号頁・発行日

1984

著者

by Erich F. Schmidt

出版者

University of Chicago Press

巻号頁・発行日

1931

著者

Robert M. Wald

出版者

University of Chicago Press

巻号頁・発行日

1984