J/ApJ/763/88    SDSS-II supernovae Ia cosmological analysis    (Campbell+, 2013)
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Cosmology with photometrically classified type Ia supernovae from the
SDSS-II Supernova Survey.
    Campbell H., D'Andrea C.B., Nichol R.C., Sako M., Smith M., Lampeitl H.,
    Olmstead M.D., Bassett B., Biswas R., Brown P., Cinabro D., Dawson K.S.,
    Dilday B., Foley R.J., Frieman J.A., Garnavich P., Hlozek R., Jha S.W.,
    Kuhlmann S., Kunz M., Marriner J., Miquel R., Richmond M., Riess A.,
    Schneider D.P., Sollerman J., Taylor M., Zhao G.-B.
   <Astrophys. J., 763, 88 (2013)>
   =2013ApJ...763...88C
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ADC_Keywords: Supernovae ; Redshifts ; Photometry ; Surveys
Keywords: cosmology: observations; distance scale; supernovae: general; surveys

Abstract:
    We present the cosmological analysis of 752 photometrically classified
    Type Ia Supernovae (SNe Ia) obtained from the full Sloan Digital Sky
    Survey II (SDSS-II) Supernova (SN) Survey, supplemented with
    host-galaxy spectroscopy from the SDSS-III Baryon Oscillation
    Spectroscopic Survey. Our photometric-classification method is based
    on the SN classification technique of Sako et al. (2011,
    Cat. J/ApJ/738/162), aided by host-galaxy redshifts (0.05<z<0.55).
    SuperNova ANAlysis simulations of our methodology estimate that we
    have an SN Ia classification efficiency of 70.8%, with only 3.9%
    contamination from core-collapse (non-Ia) SNe. We demonstrate that
    this level of contamination has no effect on our cosmological
    constraints. We quantify and correct for our selection effects (e.g.,
    Malmquist bias) using simulations. When fitting to a flat {Lambda}CDM
    cosmological model, we find that our photometric sample alone gives
    {Omega}_m_=0.24^+0.07^_-0.05_ (statistical errors only). If we relax
    the constraint on flatness, then our sample provides competitive joint
    statistical constraints on {Omega}_m_ and {Omega}_{Lambda}_,
    comparable to those derived from the spectroscopically confirmed
    Three-year Supernova Legacy Survey (SNLS3). Using only our data, the
    statistics-only result favors an accelerating universe at 99.96%
    confidence. Assuming a constant wCDM cosmological model, and combining
    with H_0_, cosmic microwave background, and luminous red galaxy data,
    we obtain w=-0.96^+0.10^_-0.10_, {Omega}_m_=0.29^+0.02^_-0.02_, and
    {Omega}_k_=0.00^+0.03^_-0.02_ (statistical errors only), which is
    competitive with similar spectroscopically confirmed SNe Ia analyses.
    Overall this comparison is reassuring, considering the lower redshift
    leverage of the SDSS-II SN sample (z<0.55) and the lack of
    spectroscopic confirmation used herein. These results demonstrate the
    potential of photometrically classified SN Ia samples in improving
    cosmological constraints.

Description:
    The SDSS-II SN Survey is a dedicated search for intermediate-redshift
    SNe from repeated scans of the equatorial "Stripe 82" region (covering
    300deg^2^) of the original SDSS. For three months a year
    (September-November) over a three-year period (2005-2007), the SDSS
    telescope performed multi-color ugriz imaging of this area of sky,
    with a cadence of a few times per week (see section 2.1 for further
    details).

    We undertook a Baryon Oscillation Spectroscopic Survey (BOSS)
    ancillary spectroscopic program (see Dawson et al. 2013AJ....145...10D
    for details of these programs), to obtain host-galaxy information for
    most SDSS-II SN candidates (see section 2.2 and 2.3).

    We have chosen to use only the SALT2 light-curve fitting algorithm
    (Guy et al. 2010, Cat. J/A+A/523/A7) in this work.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table6.dat    189      752   Photometrically classified SNe Ia data
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See also:
 B/sn  : Asiago Supernova Catalogue (Barbon et al., 1999-)
 V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
 J/A+A/568/A22    : Joint analysis of SDSS-II and SNLS SNe Ia (Betoule+, 2014)
 J/AJ/144/17      : SDSS & CSP ugri phot. of 9 type Ia supernova (Mosher+, 2012)
 J/AJ/143/126     : Nearby Type Ia supernovae spectroscopy (Blondin+, 2012)
 J/ApJ/755/125    : Sample of SNe Ia with z<0.25 from SDSS (Galbany+, 2012)
 J/ApJ/746/85     : THe HST Cluster Supernova Survey. V. (Suzuki+, 2012)
 J/ApJS/200/12    : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)
 J/other/Nat/474.484 : Ligth curves of 4 supernovae (Quimby+, 2011)
 J/MNRAS/410/1262    : Supernova Legacy Survey. Type Ia SNe (Walker+, 2011)
 J/ApJ/740/92     : SN.Ia host galaxies properties (Gupta+, 2011)
 J/ApJ/738/162    : SN Ia candidates from the SDSS-II SN Survey (Sako+, 2011)
 J/ApJ/730/119    : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011)
 J/A+A/529/L4     : Reddening law of type Ia supernovae (Chotard+, 2011)
 J/A+A/526/A28    : SDSS-II supernovae NTT and NOT spectroscopy (Oestman+, 2011)
 J/ApJS/192/1     : Light-curve parameters from the SNLS (Conley+, 2011)
 J/AJ/142/156     : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)
 J/MNRAS/406/782  : Type Ia supernovae luminosities (Sullivan+, 2010)
 J/ApJS/190/418   : Light curves for 165 SNe (Ganeshalingam+, 2010)
 J/A+A/523/A7     : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
 J/AJ/139/120     : Low-redshift Type-Ia supernovae (Folatelli+, 2010)
 J/ApJ/730/119    : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011)
 J/ApJ/722/566    : SNe Ia host galaxies in SDSS-II SN survey (Lampeitl+, 2010)
 J/ApJ/716/712    : HST light curves of six SNe and Union2 (Amanullah+, 2010)
 J/ApJ/713/1026   : SN Ia rate at redshift <~0.3 from SDSS-II (Dilday+, 2010)
 J/ApJ/700/1097   : Light curve parameters of SN Ia (Hicken+, 2009)
 J/ApJ/700/331    : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)
 J/ApJ/699/539    : Cepheids in SN-Ia host galaxies (Riess+, 2009)
 J/ApJ/696/870    : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
 J/AJ/137/3731    : ESSENCE high-redshift supernova (Foley+, 2009)
 J/A+A/500/L17    : Spectral flux ratio of SN Ia (Bailey+, 2009)
 J/ApJS/185/32    : First-year SDSS-II SN results (Kessler+, 2009)
 J/A+A/477/717    : Spectroscopy of Type Ia supernovae (Bronder+, 2008)
 J/AJ/136/2306    : SDSS-II Supernova survey, 2005 (Holtzman+, 2008)
 J/AJ/135/1766    : Sloan Digital Sky Survey-II supernova survey (Zheng+, 2008)
 J/AJ/135/348     : SDSS-II SNe survey: search and follow-up (Sako+, 2008)
 J/ApJ/686/749    : Improved cosmological constraints from SNe (Kowalski+, 2008)
 J/ApJ/666/674    : ESSENCE supernova survey (Miknaitis+, 2007)
 J/ApJ/659/122    : Improved distances to type Ia supernovae (Jha+, 2007)
 J/AJ/133/403     : Light curve of 11 type Ia supernovae (Garg+, 2007)
 J/AJ/131/527     : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006)
 J/ApJ/607/665    : Type Ia supernovae at z>1 discovered by HST (Riess+, 2004)
 J/ApJ/594/1      : High-z supernovae VRI mag and distances (Tonry+, 2003)
 J/AJ/112/2408    : Light Curves of 29 SNe (Hamuy+ 1996)
 http://www.icg.port.ac.uk/~campbelh/ : SNe Ia research Campbell home page
 http://classic.sdss.org/supernova    : SDSS supernova survey home page

Byte-by-byte Description of file: table6.dat
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   Bytes Format Units   Label    Explanations
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   1-  5  I5    ---     CID      [703/22075] Unique identification number for
                                   the whole SDSS-II SN Survey;
                                   (<SDSS-II SN NNNNN> in Simbad)
   7- 14  F8.6  ---     z        [0.03/0.71] BOSS host-galaxy redshift
  16- 23  F8.6  ---   e_z        [0/0.01] z uncertainty
  25- 33  F9.5  deg     RAdeg    [-47.4/58] SN event right ascension (J2000)
  35- 42  F8.5  deg     DEdeg    [-1.3/1.3] SN event declination (J2000)
  44- 52  F9.5  deg     RAGdeg   [-47.4/58] Host galaxy right ascension (J2000)
  54- 61  F8.5  deg     DEGdeg   [-1.3/1.3] Host galaxy declination (J2000)
  63- 81  I19   ---     ObjID    SDSS-DR8 object identifier for the host galaxy
  83- 90  E8.3  ---     X0       [8e-6/3e-3] SALT2 parameter X_0_ in flux units
  92- 99  E8.3  ---   e_X0       X0 uncertainty
 101-105  F5.2  mag     X1       [-3/3] SALT2 shape parameter X_1_
 107-110  F4.2  mag   e_X1       X1 uncertainty
 112-116  F5.2  mag     c        [-0.25/0.25] SALT2 color parameter
 118-121  F4.2  mag   e_c        Color uncertainty
 123-131  E9.3  ---     C01      Covariance of (X0,X1)
 133-140  E8.3  ---     C00      Variance of X0
 142-148  F7.4  ---     C11      Variance of X1
 150-155  F6.4  ---     C22      Variance of c
 157-165  E9.3  ---     C02      Covariance of (X0, c)
 167-172  F6.3  ---     C12      Covariance of (X1, c)
 174-178  F5.2  mag     mu       [36/42.8] Uncorrected distance modulus
 180-184  F5.2  mag     muc      Corrected distance modulus
 186-189  F4.2  mag   e_mu       [0.06/0.6] Distance modulus error
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History:
    From electronic version of the journal

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(End)                                     Emmanuelle Perret [CDS]    20-Oct-2014