Download Type Ia Supernovae in the SDSS Strip 82

Type Ia Supernovae in
the SDSS Stripe 82
SDSS-KSG Workshop
2008. 2. 18-20
Du-Hwan Han and Changbom Park
Kyungpook National University
Korea Institute for Advanced Study
SDSS Supernovae survey




Part of the SDSS-II project
Aim to discover SN Ia in “redshift desert” from z=0.05 to 0.4
Well-calibrated photometry in multi-band.
Extensive spectroscopic follow-up
ARC, HET, MDM, Subaru, WHT, Keck, NMSU, …
SDSS Supernovae survey


Larger spatial volume than previous SN survey.
southern equatorial Stripe 82.
Repeat imaging during Fall month of 2005-2007
Supernova
Sample

Distribution of SNe : total ~1,500 SNe
SN Ia -- 148 in 2005, 332 till 2006, 497 till now
Supernova Sample

Distribution of SNe
total ~1500 SNe
148 SN Ia in 2005
332 SN Ia till 2006
497 SN Ia till now
Supernova
Sample

Host galaxies
of Type Ia SN
from photometric
& spectroscopic
catalogs
72 hosts
overlapping with
the Main galaxies
in the Mr-z space
Properties of Host Galaxy

(u-r) color
similar to the distribution
of the Main galaxies of
each type

Slight preference of SN
Ia for bluer galaxies
Properties of Host Galaxy

(g-r) color
similar to the distribution
of the Main galaxies of
each type
Properties of Host Galaxy

Luminosity
+ extinction
+ K-correction

SN Ia prefers galaxies
with Mr ~ M*-0.5
Properties of Host Galaxy

Local density
5th nearby galaxy
Δv=±1000 km/s

Definite preference of
SN Ia for galaxies
in low density regions
Properties of Host Galaxy

Distance to
the nearest galaxy
Summary


SDSS-II Supernova Survey (Fall month of 2005-7)
discovered about 500 SN Ia (now)
Properties of Host galaxy
-(u-r) & (g-r) color
-Luminosity
-Local density
-Distance to r1

Future work
- dependence of SN Ia properties on hosts and environment
- analysis with additional SN Ia samples (2007) &
luminous main galaxies (DR7)