Sasaki M (2016)
Publication Status: Published
Publication Type: Journal article
Publication year: 2016
Publisher: EDP SCIENCES S A
Book Volume: 585
DOI: 10.1051/0004-6361/201526932
Aims: We present a comprehensive X-ray study of the population of
supernova remnants (SNRs) in the Large Magellanic Cloud (LMC). Using
primarily XMM-Newton observations, we conduct a systematic spectral
analysis of LMC SNRs to gain new insight into their evolution and the
interplay with their host galaxy.
Methods: We combined all the
archival XMM-Newton observations of the LMC with those of our Very Large
Programme LMC survey. We produced X-ray images and spectra of 51 SNRs,
out of a list of 59 objects compiled from the literature and augmented
with newly found objects. Using a careful modelling of the background,
we consistently analysed all the X-ray spectra and measure temperatures,
luminosities, and chemical compositions. The locations of SNRs are
compared to the distributions of stars, cold gas, and warm gas in the
LMC, and we investigated the connection between the SNRs and their local
environment, characterised by various star formation histories. We
tentatively typed all LMC SNRs, in order to constrain the ratio of
core-collapse to type Ia SN rates in the LMC. We also compared the
column densities derived from X-ray spectra to H I maps, thus probing
the three-dimensional structure of the LMC.
Results: This work
provides the first homogeneous catalogue of the X-ray spectral
properties of SNRs in the LMC. It offers a complete census of LMC
remnants whose X-ray emission exhibits Fe K lines (13% of the sample),
or reveals the contribution from hot supernova ejecta (39%), which both
give clues to the progenitor types. The abundances of O, Ne, Mg, Si, and
Fe in the hot phase of the LMC interstellar medium are found to be
between 0.2 and 0.5 times the solar values with a lower abundance ratio
[α/Fe] than in the Milky Way. The current ratio of core-collapse to type
Ia SN rates in the LMC is constrained to NCC/NIa=1.35(-0.24+0.11),
which is lower than in local SN surveys and galaxy clusters. Our
comparison of the X-ray luminosity functions of SNRs in Local Group
galaxies (LMC, SMC, M31, and M33) reveals an intriguing excess of bright
objects in the LMC. Finally, we confirm that 30 Doradus and the LMC Bar
are offset from the main disc of the LMC to the far and near sides,
respectively.
APA:
Sasaki, M. (2016). The population of X-ray supernova remnants in the Large Magellanic Cloud. Astronomy & Astrophysics, 585. https://doi.org/10.1051/0004-6361/201526932
MLA:
Sasaki, Manami. "The population of X-ray supernova remnants in the Large Magellanic Cloud." Astronomy & Astrophysics 585 (2016).
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