Skip to Main content Skip to Navigation
Journal articles

Confirmation of a Star Formation Bias in Type Ia Supernova Distances and its Effect on Measurement of the Hubble Constant

M. Rigault G. Aldering M. Kowalski Y. Copin 1 P. Antilogus 2 C. Aragon S. Bailey C. Baltay D. Baugh S. Bongard 2 K. Boone C. Buton 1 Jie Chen 3, 4 N. Chotard 1 H. K. Fakhouri U. Feindt P. Fagrelius M. Fleury 5 D. Fouchez 6 E. Gangler 1 B. Hayden A. G. Kim P.-F. Leget S. Lombardo J. Nordin R. Pain 2 E. Pecontal 7 R. Pereira 1 S. Perlmutter D. Rabinowitz K. Runge D. Rubin C. Saunders G. Smadja 1 C. Sofiatti N. Suzuki 8 C. Tao B. A. Weaver
1 IPNL - Institut de Physique Nucléaire de Lyon
2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3 Environment Research Institute
4 LAP3 - Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention
5 IFPEN - IFP Energies nouvelles
6 CPPM - Centre de Physique des Particules de Marseille
7 CRAL - Centre de Recherche Astrophysique de Lyon
8 Institute of Geology and Paleontology
Abstract : Previously we used the Nearby Supernova Factory sample to show that SNe~Ia having locally star-forming environments are dimmer than SNe~Ia having locally passive environments.Here we use the \constitution\ sample together with host galaxy data from \GALEX\ to independently confirm that result. The effect is seen using both the SALT2 and MLCS2k2 lightcurve fitting and standardization methods, with brightness differences of $0.094 \pm 0.037\ \mathrm{mag}$ for SALT2 and $0.155 \pm 0.041\ \mathrm{mag}$ for MLCS2k2 with $R_V=2.5$. When combined with our previous measurement the effect is $0.094 \pm 0.025\ \mathrm{mag}$ for SALT2. If the ratio of these local SN~Ia environments changes with redshift or sample selection, this can lead to a bias in cosmological measurements. We explore this issue further, using as an example the direct measurement of $H_0$. \GALEX{} observations show that the SNe~Ia having standardized absolute magnitudes calibrated via the Cepheid period--luminosity relation using {\textit{HST}} originate in predominately star-forming environments, whereas only ~50% of the Hubble-flow comparison sample have locally star-forming environments. As a consequence, the $H_0$ measurement using SNe~Ia is currently overestimated. Correcting for this bias, we find a value of $H_0^{corr}=70.6\pm 2.6\ \mathrm{km\ s^{-1}\ Mpc^{-1}}$ when using the LMC distance, Milky Way parallaxes and the NGC~4258 megamaser as the Cepheid zeropoint, and $68.8\pm 3.3\ \mathrm{km\ s^{-1}\ Mpc^{-1}}$ when only using NGC~4258. Our correction brings the direct measurement of $H_0$ within $\sim 1\,\sigma$ of recent indirect measurements based on the CMB power spectrum.
Document type :
Journal articles
Complete list of metadata
http://hal.in2p3.fr/in2p3-01142814
Contributor : Sylvie Flores Connect in order to contact the contributor
Submitted on : Thursday, April 16, 2015 - 8:32:29 AM
Last modification on : Tuesday, November 16, 2021 - 5:24:53 AM

Links full text

openaccess

Identifiers

Collections

IN2P3 | CNRS | UNIV-PARIS7 | IFP | CPPM | INSU | CRAL | UNIV-AMU | UNIV-LYON1 | SORBONNE-UNIVERSITE | ENS-LYON | IP2I | UDL | UNIV-PARIS | UP-SCIENCES | SU-TI | LPNHE | SU-SCIENCES | UPMC

Citation

M. Rigault, G. Aldering, M. Kowalski, Y. Copin, P. Antilogus, et al.. Confirmation of a Star Formation Bias in Type Ia Supernova Distances and its Effect on Measurement of the Hubble Constant. The Astrophysical Journal, American Astronomical Society, 2015, 802, pp.20. ⟨10.1088/0004-637X/802/1/20⟩. ⟨in2p3-01142814⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Les métriques sont temporairement indisponibles