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The supernova remnant G78.2+2.1: New optical and X-ray observations

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Abstract

New optical and X-ray observations of the supernova remnant (SNR) G78.2+2.1 are presented. CCD Hα observations with a Fabry-Perot interferometer attached to the 125-cm reflector at the Crimean Station of the Sternberg Astronomical Institute are used to obtain the radial-velocity field toward the SNR and in its vicinity. The brightness distribution and X-ray spectrum of the SNR are obtained from archival ROSAT and ASCA X-ray data. The X-ray image of G78.2+2.1 exhibits a shell structure (ΔR/R≃0.3) and is generally similar to its radio image; a comparison with the radio map at ν=1.4 GHz constructed from archival VLA data reveals the coincidence of features on scales of several arcminutes at the eastern boundary of G78.2+2.1. Weak X-ray emission (an outer shell or a halo of size ≃2°) has been identified for the first time far outside G78.2+2.1. The X-ray emission from G78.2+2.1 is shown to characterize a young adiabatic SNR [M X-ray ≃ 100 M ⊙, V s≃103km s−1, t≃(5–6)×103 years], which probably expands inside the cavity swept up by the progenitor's stellar wind. Searches for the corresponding radio structure are required to elucidate the nature of the outer X-ray shell or halo.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899, Russia

    T. A. Lozinskaya & V. V. Pravdikova

  2. Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117810, Russia

    A. V. Finoguenov

Authors
  1. T. A. Lozinskaya
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  2. V. V. Pravdikova
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  3. A. V. Finoguenov
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__________

Translated from Pis'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 26, No. 2, 2000, pp. 102–114.

Original Russian Text Copyright © 2000 by Lozinskaya, Pravdikova, Finoguenov.

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Lozinskaya, T.A., Pravdikova, V.V. & Finoguenov, A.V. The supernova remnant G78.2+2.1: New optical and X-ray observations. Astron. Lett. 26, 77–87 (2000). https://doi.org/10.1134/1.20371

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  • DOI: https://doi.org/10.1134/1.20371

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