J/MNRAS/450/905 New SNe in SDSS DR9 (Graur+, 2015)
A unified explanation for the supernova rate-galaxy mass dependence based on
supernovae detected in Sloan galaxy spectra.
Graur O., Bianco F.B., Modjaz M.
<Mon. Not. R. Astron. Soc. 450, 905 (2015)>
=2015MNRAS.450..905G 2015MNRAS.450..905G
ADC_Keywords: Surveys ; Supernovae
Keywords: methods: observational - surveys - supernovae: general
Abstract:
Using a method to discover and classify supernovae (SNe) in galaxy
spectra, we detect 91 Type Ia SNe (SNe Ia) and 16 Type II SNe (SNe II)
among ∼740000 galaxies of all types and ∼215000 star-forming
galaxies without active galactic nuclei, respectively, in Data Release
9 of the Sloan Digital Sky Survey. Of these SNe, 15 SNe Ia and eight
SNe II are new discoveries reported here for the first time. We use
our SN samples to measure SN rates per unit mass as a function of
galaxy stellar mass, star-formation rate (SFR), and specific SFR
(sSFR), as derived by the MPA-JHU Galspec pipeline. We show that
correlations between SN Ia and SN II rates per unit mass and galaxy
stellar mass, SFR, and sSFR can be explained by a combination of the
respective SN delay-time distributions (the distributions of times
that elapse between the formation of a stellar population and all
ensuing SNe), the ages of the surveyed galaxies, the redshifts at
which they are observed, and their star formation histories.
Description:
In this work, we selected our galaxy sample from SDSS DR9, which
includes updated reductions of the galaxy spectra from previous Data
Releases.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 92 107 SNe discovered in SDSS DR9 galaxies
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See also:
J/MNRAS/417/916 : Supernovae in the Subaru Deep Field (Graur+, 2011)
J/MNRAS/430/1746 : 90 new SNIa from SDSS DR7 (Graur+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS name, JHHMMSS.ss+DDMMSS.s
21 A1 --- f_SDSS [a] a: SN first discovered in this work
23- 36 A14 --- PMF SDSS DR9 Plate, MJD, and fibre in which the
SN was discovered
38- 47 A10 "date" Date Date on which the supernova was captured,
in DD/MM/YYYY
49- 53 F5.3 --- z [0.014/0.19] SN host-galaxy redshift
55- 57 I3 d Age1 [-9/250] SN age, as measured by SVD (1)
59- 61 I3 d Age2 [-11/310] SN age, as measured by SNID (1)
63- 66 F4.2 --- s [0.76/1.28]? SN stretch, as measured with
the SALT2 templates (2)
68- 72 F5.2 mag magSN SN r'-band magnitude
74- 78 F5.2 mag magG Host-galaxy r'-band magnitude
80- 82 F3.1 --- chi2G Reduced χ2 value of galaxy fit
84- 86 F3.1 --- chi2SN Reduced χ2 value of galaxy+SN fit
88- 92 A5 --- Type SN type (Ia, Ia/Ic or II)
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Note (1): SNe Ia and SNe II have age uncertainties of ±6d and ±33d,
respectively.
Note (2): Stretch values have uncertainties of +0.10-0.14.
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Acknowledgements:
Or Graur, orgraur(at)wise.tau.ac.il
(End) Patricia Vannier [CDS] 02-Jun-2015