Anderson, JP and James, PA and Foerster, F and Gonzalez-Gaitan, S and Habergham, SM and Hamuy, M and Lyman, JD (2015) On the environments of Type Ia supernovae within host galaxies. Monthly Notices of the Royal Astronomical Society, 448 (1). pp. 732-753. ISSN 0035-8711
1412.6315v1.pdf - Accepted Version
We present constraints on supernovae type Ia (SNe Ia) progenitors through an analysis of the environments found at the explosion sites of 102 events within star-forming host galaxies. Hα and GALEX near-UV images are used to trace on-going and recent star formation (SF), while broad band B,R, J,K imaging is also analysed. Using pixel statistics we find that SNe Ia show the lowest degree of association with Hα emission of all supernova types.
It is also found that they do not trace near-UV emission. As the latter traces SF on timescales less than 100Myr, this rules out any extreme ‘prompt’ delay-times as the dominant progenitor channel of SNe Ia. SNe Ia best trace the B-band light distribution of their host galaxies. This
implies that the population within star-forming galaxies is dominated by relatively young progenitors. Splitting SNe by their (B-V) colours at maximumlight, ‘redder’ events show a higher degree of association to H II regions and are found more centrally within hosts. We discuss possible explanations of this result in terms of line of sight extinction and progenitor effects. No evidence for correlations between SN stretch and environment properties is observed.
Key words: supernovae: general, galaxies: statistics
|Additional Information:||This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (March 21, 2015) 448(1),732-753 is available online at: http://dx.doi.org/10.1093/mnras/stu2712|
|Uncontrolled Keywords:||0201 Astronomical And Space Sciences|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Astrophysics Research Institute|
|Publisher:||Oxford University Press|
|Date Deposited:||22 Apr 2015 11:31|
|Last Modified:||15 May 2015 11:45|
|DOI or Identification number:||10.1093/mnras/stu2712|
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