2014AJ....148...41B -
Astron. J., 148, 41 (2014/September-0)
A search for supernova remnants in NGC 6946 using the [Fe II] 1.64 µm line.
BRUURSEMA J., MEIXNER M., LONG K.S. and OTSUKA M.
Abstract (from CDS):
Shock models indicate and observations show that in the infrared (IR), supernova remnants (SNRs) emit strongly in [Fe II] at 1.64 µm. Here, we report the results of a search for SNRs in NGC 6946 relying on [Fe II] 1.64 µm line emission, where we employed an adjacent [Fe II]Off filter to accurately assess the local continuum levels. For this study, we used the WIYN High Resolution Infrared Camera on the WIYN 3.5 m telescope to image NGC 6946 in broadbands J and H and narrowbands [Fe II], [Fe II]Off, Paβ, and PaβOff. From our search, we have identified 48 SNR candidates (SNRcs), 6 of which are coincident with sources found in prior radio, optical, and/or X-ray studies. The measured [Fe II] fluxes of our SNRcs range from 1.5x10–16 to 4.2x10–15 erg/s/cm2 and are among the highest of previously published extragalactic SNR [Fe II] fluxes. All of the candidates now need to be confirmed spectroscopically. However, the fact that we detect as many objects as we did suggests that [Fe II] can be used as an effective search tool to find extragalactic SNRs.
Abstract Copyright:
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Journal keyword(s):
galaxies: individual: NGC 6946 - ISM: supernova remnants
Nomenclature:
Fig. 3, Table 4: [BML2014] NN (Nos 1-48).
Simbad objects:
60
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