CONSTRAINING the AGE and DISTANCE of the GALACTIC SUPERNOVA REMNANT G156.2+5.7 by Hα EXPANSION MEASUREMENTS

Satoru Katsuda, Masaomi Tanaka, Tomoki Morokuma, Robert Fesen, Dan Milisavljevic

研究成果: Article査読

6 被引用数 (Scopus)

抄録

We present deep Hα images of portions of the X-ray bright, but optically faint, Galactic supernova remnant G156.2+5.7, revealing numerous and delicately thin non-radiative filaments, which mark the location of the remnant's forward shock. These new images show that these filaments have a complex structure not visible on previous lower resolution optical images. By comparing Hα images taken in 2004 at the McDonald Observatory and in 2015-2016 at the Kiso Observatory, we set a stringent 1σ upper limit of expansion to be yr-1. This proper motion, combined with a shock speed of 500 km s-1, inferred from X-ray spectral analyses, gives a distance of 1.7 kpc. In addition, a simple comparison of expansion indices of several supernova remnants allows us to infer the age of the remnant to be a few tens of thousands years old. These estimates are more straightforward and reliable than any other previous studies, and clearly rule out the possibility that G156.2+5.7 is physically associated with part of the Taurus-Auriga cloud and dust complex at a distance of 200-300 pc.

本文言語English
論文番号108
ジャーナルAstrophysical Journal
826
2
DOI
出版ステータスPublished - 2016 8 1
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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