J/MNRAS/448/732 Type Ia SN environment within host galaxies (Anderson+, 2015)
On the environments of Type Ia supernovae within host galaxies.
Anderson J.P., James P.A., Forster F., Gonzalez-Gaitan S., Habergham S.M.,
Hamuy M., Lyman J.D.
<Mon. Not. R. Astron. Soc., 448, 732-753 (2015)>
=2015MNRAS.448..732A 2015MNRAS.448..732A (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Ultraviolet
Keywords: supernovae: general - galaxies: statistics
Abstract:
We present constraints on Type Ia supernovae (SNe Ia) progenitors
through an analysis of the environments found at the explosion sites
of 102 events within star-forming host galaxies. Hα and Galaxy
Evolution Explorer near-ultraviolet (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 (SN) types. It is also found that they do not trace near-UV
emission. As the latter traces SF on time-scales 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 maximum light,
'redder' events show a higher degree of association with HII 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.
Description:
The sample we study is a compilation of SNe and their host galaxies
from the literature.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 103 *SN and host galaxy parameters
tablea1.dat 55 103 SNe environment statistical analyses values
refs.dat 83 34 References
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Note on table1.dat: The SN sample analysed in this work, together with estimated
light-curve parameters and references for photometry.
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- SN SN designation (YYYYaa)
7 A1 --- n_SN [ab] Note on SN (1)
9- 21 A13 --- Host Host galaxy
25- 30 A6 --- GType Galaxy Hubble type (from NED)
31 A1 --- n_GType [cde] Note on GType (1)
33- 36 I4 km/s Vr Recession velocity (from NED)
38- 42 F5.3 --- Stretch ? Stretch
45- 50 F6.3 mag (B-V)max ? B-V colour index at maximum light
52- 61 A10 --- Ref Photometry references (2)
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Note (1): Notes as follows:
a = Classification from IAU SN catalogue
b = Classification as SN Ia from Sandage & Tammann (1993ApJ...415....1S 1993ApJ...415....1S)
c = While this galaxy is classed as Hubble type S0 (i.e. no, or very little
SF), there is definitely large amounts of detected Hα line
emission produced by on-going SF
d = Galaxy is classified as S0, but significant on-going SF is detected
e = Galaxy is classified as S0, but significant on-going SF is detected
Note (2): where we only include data if the light-curve fits passed our
selection criteria.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- SN SN designation (YYYYaa)
9- 13 F5.3 --- NCRHa ? NCR value derived from Hα band (1)
15- 19 F5.3 --- NCRNUV ? NCR value derived from near-UV band (1)
21- 25 F5.3 --- NCRB ? NCR value derived from B ban (1)d
27- 31 F5.3 --- NCRR ? NCR value derived from R-band (1)
33- 37 F5.3 --- NCRJ ? NCR value derived from J-band (1)
39- 43 F5.3 --- NCRK ? NCR value derived from K-band (1)
45- 49 F5.3 --- FrR ? Fractional flux in R-band
51- 55 F5.3 --- FrHa ? Fractional flux in Hα
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Note (1): In James & Anderson (2006A&A...453...57J 2006A&A...453...57J), a pixel statistics method
was introduced which was created to give a quantitative measure of the
association of individual SNe to the underlying SF present within galaxies.
This method produces for each pixel within an image a value (dubbed 'NCR';
Anderson & James, 2008MNRAS.390.1527A 2008MNRAS.390.1527A) between 0 and 1 which indicates where
within the overall host galaxy SF distribution each pixel is found.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 43 A20 --- Aut Author's name
45- 83 A39 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Aug-2015