Proper motion of Cygnus Loop shock filaments
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Published:2023
Issue:207
Volume:
Page:9-19
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ISSN:1450-698X
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Container-title:Serbian Astronomical Journal
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language:en
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Short-container-title:SERBIAN ASTRON J
Author:
Vucetic M.1ORCID, Milanovic N.2, Urosevic D.1ORCID, Raymond J.3, Onic D.1ORCID, Milosevic S.1ORCID, Petrov N.4
Affiliation:
1. Department of Astronomy, Faculty of Mathematics, University of Belgrade, Belgrade, Serbia 2. Max Planck Institute for Solar System Research, Göttingen, Germany 3. Harvard-Smithsonian Center for Astrophysics, Cambridge, USA 4. Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, Sofia, Bulgaria
Abstract
We determined the shock speed in the Galactic supernova remnant Cygnus Loop,
using the proper motion of its optical filaments and the latest estimate of
its distance. The proper motion was measured by comparing H? images of the
remnant observed in two epochs: 1993 (Kitt Peak National Observatory) and
2018/2019 (National Astronomical Observatory Rozhen and Astronomical Station
Vidojevica). We derived shock speed for 35 locations along different
filaments, which is twice as much as in earlier studies of the north-eastern
part of the Cygnus Loop. For the first time, we have measured the shock
speed of the radiative filaments in this region. Three of the analyzed
locations where we measured the proper motion of filaments are radiative,
based on their presence in [SII] images from the second epoch. The other
filaments are non-radiative. The speed we obtained for the non-radiative
filaments is in the range of 240{650 km s-1, with an estimate for the
uncertainty of 70 km s-1. These values are mostly in agreement with previous
studies. The radiative filaments have lower speeds of 100-160 ?70 km s-1,
which is in agreement with the assumption that they are older in
evolutionary terms. This clear distinction between the speed of the two
types of filaments proves that [SII] emission can be used for identifying
radiative filaments in supernova remnants.
Publisher
National Library of Serbia
Subject
Astronomy and Astrophysics
Reference20 articles.
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