J/ApJS/185/32 First-year SDSS-II SN results (Kessler+, 2009)
First-year Sloan Digital Sky Survey-II supernova results: Hubble diagram and
cosmological parameters.
Kessler R., Becker A.C., Cinabro D., Vanderplas J., Frieman J.A.,
Marriner J., Davis T.M., Dilday B., Holtzman J., Jha S.W., Lampeitl H.,
Sako M., Smith M., Zheng C., Nichol R.C., Bassett B., Bender R.,
Depoy D.L., Doi M., Elson E., Filippenko A.V., Foley R.J., Garnavich P.M.,
Hopp U., Ihara Y., Ketzeback W., Kollatschny W., Konishi K., Marshall J.L.,
McMillan R.J., Miknaitis G., Morokuma T., Mortsell E., Pan K., Prieto J.L.,
Richmond M.W., Riess A.G., Romani R., Schneider D.P., Sollerman J.,
Takanashi N., Tokita K., van der Heyden K., Wheeler J.C., Yasuda N.,
York D.
<Astrophys. J. Suppl. Ser., 185, 32-84 (2009)>
=2009ApJS..185...32K 2009ApJS..185...32K
ADC_Keywords: Supernovae ; Surveys ; Redshifts ; Extinction
Keywords: cosmological parameters - cosmology: observations - distance scale -
methods: data analysis - supernovae: general - surveys
Abstract:
We present measurements of the Hubble diagram for 103 Type Ia
supernovae (SNe) with redshifts 0.04<z<0.42, discovered during the
first season (Fall 2005) of the Sloan Digital Sky Survey-II (SDSS-II)
Supernova Survey. These data fill in the redshift "desert" between
low- and high-redshift SN Ia surveys. Within the framework of the
MLCS2K2 light-curve fitting method, we use the SDSS-II SN sample to
infer the mean reddening parameter for host galaxies,
RV=2.18±0.14stat±0.48syst, and find that the intrinsic
distribution of host-galaxy extinction is well fitted by an
exponential function, P(AV)=exp(-AV/τV), with
τV=0.334±0.088mag. We combine the SDSS-II measurements with
new distance estimates for published SN data from the ESSENCE survey,
the Supernova Legacy Survey (SNLS), the Hubble Space Telescope (HST),
and a compilation of Nearby SN Ia measurements. A new feature in our
analysis is the use of detailed Monte Carlo simulations of all surveys
to account for selection biases, including those from spectroscopic
targeting.
Description:
The SDSS-II SN Survey primary instrument was the SDSS CCD camera
mounted on a dedicated 2.5m telescope at Apache Point Observatory
(APO), New Mexico (ugriz bands), in 2005 September-November.
Spectra of SN candidates and, where possible, their host galaxies were
obtained in 2005 September-December with a number of telescopes: the
Hobby-Eberly 9.2m at McDonald Observatory, the Astrophysical Research
Consortium 3.5m at APO, the Subaru 8.2m on Mauna Kea, the Hiltner 2.4m
at MDM Observatory, the 4.2m William Herschel Telescope on La Palma,
and the Keck 10m on Mauna Kea.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10.dat 105 288 Parameters from MLCS2K2 (model from Jha et al.,
2007, Cat. J/ApJ/659/122) light curve fits
table14.dat 172 288 SALT-II (model from Guy et al. 2007A&A...466...11G 2007A&A...466...11G)
light curve fit parameters including BAO (baryon
acoustic oscillation) + CMB (cosmic microwave
background) priors
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/AJ/135/1766 : Sloan Digital Sky Survey-II supernova survey (Zheng+, 2008)
J/A+A/477/717 : Spectroscopy of Type Ia supernovae (Bronder+, 2008)
J/AJ/135/348 : SDSS-II SNe survey: search and follow-up (Sako+, 2008)
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
J/ApJ/666/674 : ESSENCE supernova survey (Miknaitis+, 2007)
J/ApJ/607/665 : Type Ia supernovae at z>1 discovered by HST (Riess+, 2004)
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [SN:]
5- 13 A9 --- SN SN identification
15- 20 F6.4 --- z Spectroscopic redshift
22- 27 F6.4 --- e_z Error in z
29- 34 F6.3 mag DM Distance modulus
36- 40 F5.3 mag e_DM Error in DM
42- 46 F5.3 mag Av Host galaxy extinction in V-band
48- 52 F5.3 mag e_Av Error in Av
54- 59 F6.3 --- Del MLCS shape-luminosity parameter Δ
61- 65 F5.3 --- e_Del Error in Del
67- 75 F9.3 d MJD1 Modified Julian date at maximum brightness of
rest-frame B-band
77- 80 F4.2 d e_MJD1 Error in MJD
82- 86 F5.3 --- Rv Extinction law parameter Rv=Av/E(B-V)
(ratio of total to selective absorption)
88- 92 F5.3 --- e_Rv ?=0 Error in Rv
94- 97 F4.1 --- fit1 MLCS fit χ2
99-101 I3 --- dof1 Number of degrees of freedom in fit
103-105 I3 --- Tel Telescope identification (G1)
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Byte-by-byte Description of file: table14.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [SN:]
5- 13 A9 --- SN SN identification
15- 20 F6.4 --- z Spectroscopic redshift
22- 27 F6.4 --- e_z ?=0 Error in z
29- 35 F7.4 --- c Color term
37- 42 F6.4 --- e_c Error in c
44- 50 F7.4 --- x1 Shape-luminosity parameter
52- 57 F6.4 --- e_x1 Error in x1
59- 67 F9.3 d MJD2 Modified Julian date at maximum brightness of
rest-frame B-band
69- 74 F6.3 d e_MJD2 Error in MJD
76- 81 F6.2 --- fit2 SALT-II fit χ2
83- 85 I3 --- dof2 Number of degrees of freedom in fit
87- 89 I3 --- Tel Telescope identification (G1)
91- 96 F6.3 mag DMa ?=-9 Distance modulus; SDSS only combination (3)
98-103 F6.3 mag e_DMa ?=-9 Error in DMa (3)
105-110 F6.3 mag DMb ?=-9 Distance modulus; SDSS+ESSENCE+SNLS
combinations (3)
112-117 F6.3 mag e_DMb ?=-9 Error in DMb (3)
119-124 F6.3 mag DMc ?=-9 Distance modulus; LOWZ+SDSS combinations (3)
126-131 F6.3 mag e_DMc ?=-9 Error in DMc (3)
133-138 F6.3 mag DMd ?=-9 Distance modulus; LOWZ+SDSS+ESSENCE+SNLS
combinations (3)
140-145 F6.3 mag e_DMd ?=-9 Error in DMd (3)
147-152 F6.3 mag DMe ?=-9 Distance modulus; LOWZ+SDSS+ESSENCE+SNLS+HST
combinations (3)
154-158 F5.3 mag e_DMe ?=-9 Error in DMe (3)
160-165 F6.3 mag DMf ?=-9 Distance modulus; LOWZ+ESSENCE+SNLS
combinations (3)
167-172 F6.3 mag e_DMf ?=-9 Error in DMf (3)
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Note (3):
-9.000 = Placeholder value. SNe not included in the sample combination.
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Global notes:
Note (G1): Telescopes are numbered as follows:
1 = SDSS (SDSS-II SN Survey; Frieman et al. 2008AJ....135..338F 2008AJ....135..338F);
3 = ESSE (ESSENCE project; Wood-Vasey et al. 2007ApJ...666..694W 2007ApJ...666..694W, see also
Miknaitis et al. 2007, Cat. J/ApJ/666/674);
4 = SNLS (Supernova Legacy Survey (SNLS); Astier et al. 2006A&A...447...31A 2006A&A...447...31A)
50 = Nearby (Jha et al. 2007, Cat. J/ApJ/659/122);
100 = HST (Riess et al. 2007ApJ...659...98R 2007ApJ...659...98R; see also Garnavich et al.
1998ApJ...493L..53G 1998ApJ...493L..53G; Knop et al. 2003ApJ...598..102K 2003ApJ...598..102K; Riess et al.
2004, Cat. J/ApJ/607/665)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Mar-2011