J/ApJ/722/566 Host galaxies of SNe Ia in SDSS-II SN survey (Lampeitl+, 2010)
The effect of host galaxies on type Ia supernovae in the SDSS-II supernova
survey.
Lampeitl H., Smith M., Nichol R.C., Bassett B., Cinabro D., Dilday B.,
Foley R.J., Frieman J.A., Garnavich P.M., Goobar A., Im M., Jha S.W.,
Marriner J., Miquel R., Nordin J., Ostman L., Riess A.G., Sako M.,
Schneider D.P., Sollerman J., Stritzinger M.
<Astrophys. J., 722, 566-576 (2010)>
=2010ApJ...722..566L 2010ApJ...722..566L
ADC_Keywords: Supernovae ; Galaxies, optical ; Surveys
Keywords: distance scale - galaxies: fundamental parameters -
supernovae: general
Abstract:
We present an analysis of the host galaxy dependences of Type Ia
Supernovae (SNe Ia) from the full three year sample of the SDSS-II
Supernova Survey. We re-discover, to high significance, the strong
correlation between host galaxy type and the width of the observed SN
light curve, i.e., fainter, quickly declining SNe Ia favor passive
host galaxies, while brighter, slowly declining Ia's favor
star-forming galaxies. We also find evidence (at between 2σ and
3σ) that SNe Ia are ∼0.1±0.04mag brighter in passive host
galaxies than in star-forming hosts, after the SN Ia light curves have
been standardized using the light-curve shape and color variations.
This difference in brightness is present in both the SALT2 and MCLS2k2
light-curve fitting methodologies. We see evidence for differences in
the SN Ia color relationship between passive and star-forming host
galaxies, e.g., for the MLCS2k2 technique, we see that SNe Ia in
passive hosts favor a dust law of RV=1.0±0.2, while SNe Ia in
star-forming hosts require RV=1.8+0.2-0.4. The significance of
these trends depends on the range of SN colors considered. We
demonstrate that these effects can be parameterized using the stellar
mass of the host galaxy (with a confidence of >4σ) and including
this extra parameter provides a better statistical fit to our data.
Our results suggest that future cosmological analyses of SN Ia samples
should include host galaxy information.
Description:
In this analysis, we use the full data set from the SDSS-II Supernova
Survey (Frieman et al. 2008AJ....135..338F 2008AJ....135..338F). The SDSS-II SN Survey was
a dedicated search for transient objects using the SDSS 2.5m telescope
and imaging camera to perform repeat imaging of the "Stripe 82" region
of the SDSS survey for three months a year from 2005 to 2007. To
ensure that our SN sample is more complete, we also include
photometric SNe Ia that have a light curve consistent with being a
Type Ia, based on the Bayesian light-curve fitting of Sako et al.
(2008, Cat. J/AJ/135/348), and a known host galaxy spectroscopic
redshift.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 78 162 Host properties used in the main SALT2 (Guy et
al. 2007A&A...466...11G 2007A&A...466...11G) analysis
--------------------------------------------------------------------------------
See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/A+A/526/A28 : SDSS-II supernovae NTT and NOT spectroscopy (Oestman+, 2011)
J/ApJ/713/1026 : SN Ia rate at redshift ≲0.3 from SDSS-II (Dilday+, 2010)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
J/ApJ/700/1097 : Light curve parameters of SN Ia (Hicken+, 2009)
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/687/1201 : SN and LGRB locations in their host galaxies (Kelly+, 2008)
J/PASP/117/773 : Classifications of SN host galaxies. III (van den Bergh+,
2005)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- SDSS-II SN designation (<SDSS-II SN NNNNN>)
7- 12 A6 --- SN IAU designation (YYYYaa)
14- 15 I2 h RAh Hour of Right Ascension (J2000)
17- 18 I2 min RAm Minute of Right Ascension (J2000)
20- 25 F6.3 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 38 F5.2 arcsec DEs Arcsecond of Declination (J2000)
40- 44 F5.2 [Msun] logM Log of the stellar mass
46- 49 F4.2 [Msun] E_logM Upper uncertainty in logM
51- 54 F4.2 [Msun] e_logM Lower uncertainty in logM
56- 60 F5.2 [Msun/yr] logSFR ? Log of the star formation rate (1)
62- 65 F4.2 [Msun/yr] E_logSFR ? Upper uncertainty in logSFR
67- 70 F4.2 [Msun/yr] e_logSFR ? Lower uncertainty in logSFR
72- 73 A2 --- cl SN Ia classification basis: sp (spectrum)
or lc (light-curve shape)
75- 76 A2 --- Hcl Host classification: p (passive) or
sf (star-forming galaxy)
78 A1 --- S [r] r: Member of restricted sample (with
tighter allowed ranges of c (color value)
and x1 (stretch value))
--------------------------------------------------------------------------------
Note (1): Hosts with negligible star formation rates are blank.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Jul-2012