Distance to M101 from SN 2011fe Distance to M101 from SN 2011fe
Jozsef Vinko Jozsef Vinko
(University of Szeged / UT Austin)
(University of Szeged / UT Austin)
BVRI photometry BVRI photometry
Konkoly Observatory Konkoly Observatory
Piszkesteto Station, Hungary Piszkesteto Station, Hungary 60/90 cm Schmidt telescope 60/90 cm Schmidt telescope
Apogee Alta U16 CCD Apogee Alta U16 CCD
Bessell filters Bessell filters
37 nights between Aug.25 Nov.06.
37 nights between Aug.25 Nov.06.
calibrated via Landolt fields calibrated via Landolt fields
BVRI photometry BVRI photometry
Konkoly Observatory Konkoly Observatory
Piszkesteto Station, Hungary Piszkesteto Station, Hungary 60/90 cm Schmidt telescope 60/90 cm Schmidt telescope
Apogee Alta U16 CCD Apogee Alta U16 CCD
Bessell filters Bessell filters
37 nights between Aug.25 Nov.06.
37 nights between Aug.25 Nov.06.
calibrated via Landolt fields calibrated via Landolt fields
Why SN 2011fe ? Why SN 2011fe ?
spectrum looks like "normal" (not peculiar) Ia spectrum looks like "normal" (not peculiar) Ia z = 0.0008 ==> Kcorrection negligible z = 0.0008 ==> Kcorrection negligible
A A
VV(total) ~ 0.08 mag (total) ~ 0.08 mag
==> reddeningrelated problems minimal
==> reddeningrelated problems minimal
host galaxy (M101) has independent distances host galaxy (M101) has independent distances from Cepheids
from Cepheids
SN 2011fe is the Ia that we were waiting for!
SN 2011fe is the Ia that we were waiting for!
MLCS2k2 analysis MLCS2k2 analysis
m
X t = M
X t p
X t q
X t
2 5 log H
0/ 65
0 A
Xassumptions:
assumptions:
RRVV = 3.1 (Galactic reddening law) = 3.1 (Galactic reddening law)
HH00 = 73 km/s/Mpc (from HST Key Project) = 73 km/s/Mpc (from HST Key Project)
(Jha, Riess & Kirshner, 2007) (Jha, Riess & Kirshner, 2007)
Fitting results:
Fitting results:
A A
VV(host) = 0.05 (host) = 0.05 ± ± 0.01 mag > low reddening 0.01 mag > low reddening Δ Δ = 0.01 = 0.01 ± ± 0.08 > fiducial Ia 0.08 > fiducial Ia
μ μ
00= 29.21 = 29.21 ± ± 0.07 mag > D = 6.95 Mpc 0.07 mag > D = 6.95 Mpc
MLCS2k2 analysis MLCS2k2 analysis
reduced χ
reduced χ
22= 0.289 = 0.289
MLCS2k2 analysis MLCS2k2 analysis
Uncertainties:
Uncertainties:
(10%
(10% ΔχΔχ22 change change):):
δΔ δΔ = = ± ± 0.08 mag 0.08 mag δμ δμ = = ± ± 0.07 mag 0.07 mag
Δ Δ and and μ μ are are
strongly correlated
strongly correlated
SALT2 analysis SALT2 analysis
= m
B∗− M
0⋅x
1−⋅ C
Kessler et al. ApJS 185, 32 (2009)Kessler et al. ApJS 185, 32 (2009) assuming FwCDM cosmologyassuming FwCDM cosmology
¿
¿
= m
B' − M
0⋅ s' −1 −⋅ C ' fitting parameters:
fitting parameters: m m
BB* * , , M M
00, , x x
11, , C C
calibrations for the distance modulus:
calibrations for the distance modulus:
Guy et al. A&A 523, 7 (2010) assuming H0 = 70 km/s/Mpc
mmBB'' , , s's' , , C' are linear combinations of C' are linear combinations of mmBB* * , , xx11 and and CC
SALT2 analysis
SALT2 analysis
SALT2 analysis SALT2 analysis
Fitting results
Fitting results
(corrected to H(corrected to H00 = 73 km/s/Mpc) = 73 km/s/Mpc)μ μ = 29.034 = 29.034 ± ± 0.078 (Guy et al. 2010) 0.078 (Guy et al. 2010)
μ μ = 29.068 = 29.068 ± ± 0.062 (Kessler et al. 2009) 0.062 (Kessler et al. 2009) Final estimate :
Final estimate : μ μ = 29.05 = 29.05 ± ± 0.08 0.08
M101 distance moduli M101 distance moduli
Method
Method μ μ δμ δμ Reference Reference
MLCS2k2
MLCS2k2 29.2129.21 0.070.07 this workthis work SALT2
SALT2 29.0529.05 0.080.08 this workthis work Tully-
Tully- Fisher
Fisher 29.2029.20 0.500.50 Pierce, ApJ 430, 53 (1994)Pierce, ApJ 430, 53 (1994)
EPMEPM 29.3529.35 0.400.40 Schmidt et al. ApJ 432, 42 (1994)Schmidt et al. ApJ 432, 42 (1994) Cepheids
Cepheids 29.1329.13 0.110.11 Freedman et al. ApJ 553, 47 Freedman et al. ApJ 553, 47 (2001)
(2001) Cepheids
Cepheids 29.0629.06 0.110.11 Newman et al. ApJ 553, 562 Newman et al. ApJ 553, 562 (2001)
(2001) Cepheids
Cepheids 29.0429.04 0.050.05 Shappee & Stanek, ApJ 733, 124 Shappee & Stanek, ApJ 733, 124 (2011)
(2011)
TRGBTRGB 29.0529.05 0.060.06 Shappee & Stanek, ApJ 733, 124 Shappee & Stanek, ApJ 733, 124 (2011)
(2011)
Contributors:
Contributors:
K. Sárneczky, E. Elek, A. Farkas, P. Klagyivik, T. Kovács, A. Pál, K. Sárneczky, E. Elek, A. Farkas, P. Klagyivik, T. Kovács, A. Pál, N. Szalai, A. Szing, K. Vida (Konkoly Observatory, Hungary)
N. Szalai, A. Szing, K. Vida (Konkoly Observatory, Hungary) T. Hegedüs, I.B. Bíró, T. Borkovits, K. Szakáts
T. Hegedüs, I.B. Bíró, T. Borkovits, K. Szakáts (Baja Observatory, Hungary)
(Baja Observatory, Hungary)
K. Takáts, T. Szalai (University of Szeged) K. Takáts, T. Szalai (University of Szeged)
Grants:
Grants:
Hungarian OTKA K76816 Hungarian OTKA K76816
EUESF TÁMOP 4.2.2/B10/120100012 EUESF TÁMOP 4.2.2/B10/120100012 NSF AST 1109881
NSF AST 1109881