Journal Article

Imaging of four Galactic supernova remnants in the mid-infrared, and their interaction with the interstellar medium

R. A. Marquez-Lugo and J. P. Phillips

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 1, pages 94-112
Published in print September 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16928.x
Imaging of four Galactic supernova remnants in the mid-infrared, and their interaction with the interstellar medium

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We provide mid-infrared (MIR) imaging, photometry and profiles for the Galactic supernova remnants (SNRs) G001.0−00.1, G355.9−02.5, G355.6−00.0 and W28 based upon data deriving for the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE). All of the sources show evidence for interaction with the interstellar medium (ISM), leading to curved frontal structures and apparent voids in the ISM. An analysis of the spectral energy distributions (SEDs) of Class I young stellar objects (YSOs) within the north-westerly interaction region of W28, and of the density of stars within the borders of the SNR, suggests that many of them may have been triggered by the SN event. 2D radiative transfer modelling permits us to constrain the physical parameters of the sources. It is also noted that the location of Class I YSOs about the perimeter of G001.0−00.1, and close to frontal arcs associated with SNR G355.9−02.5, suggests that star formation may have been triggered by these SNRs as well. Finally, it is found that the MIR colours of the frontal structures appear consistent with shock excitation of the v= 0 → 0 transitions of H2, although it is conceivable that emission by polycyclic aromatic hydrocarbons (PAHs) may also play a role. Where the latter mechanism is relevant, it is possible that emission derives from the shattering of larger grains in frontal regions, leading to increased volume densities of PAH carrying grains.

Keywords: stars: formation; supernovae: general; ISM: clouds; ISM: jets and outflows; ISM: kinematics and dynamics; ISM: supernova remnants

Journal Article.  10890 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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