Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample

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dc.contributor.authorD\'Andrea, Chris B
dc.contributor.authorGupta, Ravi R
dc.contributor.authorSako, Masao
dc.contributor.authorMorris, Matt
dc.contributor.authorNichol, Robert C
dc.contributor.authorBrown, Peter J
dc.contributor.authorCampbell, Heather
dc.contributor.authorOlmstead, Matthew D
dc.contributor.authorFrieman, Joshua A
dc.contributor.authorGarnavich, Peter
dc.contributor.authorJha, Saurabh W
dc.contributor.authorKessler, Richard
dc.contributor.authorLampeitl, Hubert
dc.contributor.authorMarriner, John
dc.contributor.authorSchneider, Donald P
dc.contributor.authorSmith, Mathew
dc.date.accessioned2021-10-08T07:20:37Z
dc.date.available2021-10-08T07:20:37Z
dc.date.issued2011
dc.description.abstractWe examine the correlation between supernova (SN) host-galaxy properties and their residuals in the Hubble diagram. We use SNe discovered during the Sloan Digital Sky Survey-II Supernova Survey, and focus on objects at a redshift of z < 0.15, where the selection effects of the survey are known to yield a complete Type Ia supernova (SN Ia) sample. To minimize the bias in our analysis with respect to measured host-galaxy properties, spectra were obtained for nearly all hosts, spanning a range in magnitude of -23 < M{sub r} < -17. In contrast to previous works that use photometric estimates of host mass as a proxy for global metallicity, we analyze host-galaxy spectra to obtain gas-phase metallicities and star formation rates (SFRs) from host galaxies with active star formation. From a final sample of {approx}40 emission-line galaxies, we find that light-curve-corrected SNe Ia are {approx}0.1 mag brighter in high-metallicity hosts than in low-metallicity hosts. We also find a significant (>3{sigma}) correlation between the Hubble Residuals of SNe Ia and the specific SFR of the host galaxy. We comment on the importance of SN/host-galaxy correlations as a source of systematic bias in future deep SN surveys.
dc.identifier.apacitation, Gupta, R. R., Sako, M., Morris, M., Nichol, R. C., Brown, P. J., ... Smith, M. (2011). Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample. <i>The Astrophysical Journal</i>, 743(2), 172 - 177. http://hdl.handle.net/11427/34967en_ZA
dc.identifier.chicagocitation, Ravi R Gupta, Masao Sako, Matt Morris, Robert C Nichol, Peter J Brown, Heather Campbell, et al "Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample." <i>The Astrophysical Journal</i> 743, 2. (2011): 172 - 177. http://hdl.handle.net/11427/34967en_ZA
dc.identifier.citation, Gupta, R.R., Sako, M., Morris, M., Nichol, R.C., Brown, P.J., Campbell, H. & Olmstead, M.D. et al. 2011. Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample. <i>The Astrophysical Journal.</i> 743(2):172 - 177. http://hdl.handle.net/11427/34967en_ZA
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.ris TY - Journal Article AU - D\'Andrea, Chris B AU - Gupta, Ravi R AU - Sako, Masao AU - Morris, Matt AU - Nichol, Robert C AU - Brown, Peter J AU - Campbell, Heather AU - Olmstead, Matthew D AU - Frieman, Joshua A AU - Garnavich, Peter AU - Jha, Saurabh W AU - Kessler, Richard AU - Lampeitl, Hubert AU - Marriner, John AU - Schneider, Donald P AU - Smith, Mathew AB - We examine the correlation between supernova (SN) host-galaxy properties and their residuals in the Hubble diagram. We use SNe discovered during the Sloan Digital Sky Survey-II Supernova Survey, and focus on objects at a redshift of z < 0.15, where the selection effects of the survey are known to yield a complete Type Ia supernova (SN Ia) sample. To minimize the bias in our analysis with respect to measured host-galaxy properties, spectra were obtained for nearly all hosts, spanning a range in magnitude of -23 < M{sub r} < -17. In contrast to previous works that use photometric estimates of host mass as a proxy for global metallicity, we analyze host-galaxy spectra to obtain gas-phase metallicities and star formation rates (SFRs) from host galaxies with active star formation. From a final sample of {approx}40 emission-line galaxies, we find that light-curve-corrected SNe Ia are {approx}0.1 mag brighter in high-metallicity hosts than in low-metallicity hosts. We also find a significant (>3{sigma}) correlation between the Hubble Residuals of SNe Ia and the specific SFR of the host galaxy. We comment on the importance of SN/host-galaxy correlations as a source of systematic bias in future deep SN surveys. DA - 2011 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - The Astrophysical Journal LK - https://open.uct.ac.za PY - 2011 SM - 0004-637X SM - 1538-4357 T1 - Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample TI - Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample UR - http://hdl.handle.net/11427/34967 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34967
dc.identifier.vancouvercitation, Gupta RR, Sako M, Morris M, Nichol RC, Brown PJ, et al. Spectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample. The Astrophysical Journal. 2011;743(2):172 - 177. http://hdl.handle.net/11427/34967.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourceThe Astrophysical Journal
dc.source.journalissue2
dc.source.journalvolume743
dc.source.pagination172 - 177
dc.source.urihttps://dx.doi.org/10.1088/0004-637X/743/2/172
dc.subject.otherastrophysics
dc.subject.othercosmology and astronomy
dc.subject.otherabundance
dc.subject.othercosmology
dc.subject.othergalaxies
dc.subject.otherred shift
dc.subject.otherstar evolution
dc.subject.othersupernovae
dc.titleSpectroscopic properties of star-forming host galaxies and type Ia supernova hubble residuals in a nearly unbiased sample
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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