spectroscopic diversity of sne ia in the near-infrared
DESCRIPTION
Eric Y. Hsiao University of Victoria. spectroscopic diversity of SNe Ia in the near-infrared. SNe Ia in the near-infrared why?. less dust extinction low redshift standard candles in JHK bands independent measure of Hubble constant high redshift rest frame I band Hubble diagram - PowerPoint PPT PresentationTRANSCRIPT
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spectroscopic diversity of SNe Ia in the near-infrared
Eric Y. HsiaoUniversity of Victoria
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SNe Ia in the near-infraredwhy?
less dust extinction
low redshift standard candles in JHK bands independent measure of Hubble constant
high redshift rest frame I band Hubble diagram independent evidence of dark energy
Eric Y. Hsiao
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SNe Ia in the near-infraredlow redshift
Eric Y. Hsiao
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SNe Ia in the near-infraredlow redshift
Krisciunas et al. 2004 ApJ, 602, 81Eric Y. Hsiao
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SNe Ia in the near-infraredhigh redshift
Eric Y. Hsiao
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SNe Ia in the near-infraredhigh redshift
Eric Y. Hsiao
Nobili et al. 2005 A&A, 437, 789
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SNe Ia in the near-infraredk-corrections
Eric Y. Hsiao
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near-infraredlibrary spectra
Eric Y. Hsiao
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near-infraredlibrary spectra
Eric Y. Hsiao
Hamuy et al. 2002 AJ, 124, 417 (1999ee) Krisciunas et al. 2007 AJ, 133, 58 (2004S) Marion et al. 2003 ApJ, 591, 316 Marion et al. 2009 AJ, submitted
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near-infraredlibrary spectra
Eric Y. Hsiao
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near-infraredlibrary spectra
Eric Y. Hsiao
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spectral templateprocedures
measure the feature strengths of the library spectra
determine the weighted mean feature strength at each epoch and wavelength
adjust the base spectral template to the weighted mean feature strengths
Eric Y. Hsiao
Hsiao et al. 2007 ApJ, 663, 1187
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spectral templatemeasurement of spectral features
measure the feature strengths of the library spectra
determine the weighted mean feature strength at each epoch and wavelength
adjust the base spectral template to the weighted mean feature strengths
Eric Y. Hsiao
Hsiao et al. 2007 ApJ, 663, 1187
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spectral templatemeasurement of spectral features
Eric Y. Hsiao
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spectral templateweighting functions
measure the feature strengths of the library spectra
determine the weighted mean feature strength at each epoch and wavelength
adjust the base spectral template to the weighted mean feature strengths
Eric Y. Hsiao
Hsiao et al. 2007 ApJ, 663, 1187
![Page 16: spectroscopic diversity of SNe Ia in the near-infrared](https://reader036.vdocuments.us/reader036/viewer/2022062410/568160f4550346895dd02f9d/html5/thumbnails/16.jpg)
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spectral templateweighting functions
Eric Y. Hsiao
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spectral templateprocedures
measure the feature strengths of the library spectra
determine the weighted mean feature strength at each epoch and wavelength
adjust the base spectral template to the weighted mean feature strengths
Eric Y. Hsiao
Hsiao et al. 2007 ApJ, 663, 1187
![Page 18: spectroscopic diversity of SNe Ia in the near-infrared](https://reader036.vdocuments.us/reader036/viewer/2022062410/568160f4550346895dd02f9d/html5/thumbnails/18.jpg)
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spectral templatemangling function
Eric Y. Hsiao
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spectral templatebase spectral template
Eric Y. Hsiao
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principal component analysis (PCA)
PCA reduces multi-dimensional data into principal components
first component is the vector pointing toward the direction of the highest variance in the multi-dimensional data space
rest of the components are orthogonal vectors ranked by their variances
Eric Y. Hsiao
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near-infraredtemporal evolution
Eric Y. Hsiao
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near-infraredtemporal evolution
Eric Y. Hsiao
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near-infraredtemporal evolution
Eric Y. Hsiao
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near-infraredspectral template
Eric Y. Hsiao
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near-infraredspectral template
Eric Y. Hsiao
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near-infraredspectral template
Eric Y. Hsiao
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near-infraredk-corrections
Eric Y. Hsiao
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near-infrareddependence on stretch
Eric Y. Hsiao
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near-infrareddependence on stretch (pre-maximum)
Eric Y. Hsiao
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I-bandlibrary spectra
Eric Y. Hsiao
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I-bandlibrary spectra
Eric Y. Hsiao
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I-bandspectral template
Eric Y. Hsiao
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I-bandk-corrections
Eric Y. Hsiao
CSP
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I-bandk-corrections
Eric Y. Hsiao
CSP
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I-bandtemporal evolution
Eric Y. Hsiao
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I-bandstretch template epoch or not?
Eric Y. Hsiao
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I-bandstretch template epoch or not?
Eric Y. Hsiao
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I-bandstretch template epoch or not?
Eric Y. Hsiao
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I-bandstretch template epoch or not?
Eric Y. Hsiao
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I-bandstretch template epoch or not?
Eric Y. Hsiao
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I-bandstretch template epoch or not?
Eric Y. Hsiao
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I-banddependence on stretch
Eric Y. Hsiao
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I-banddependence on stretch (primary maximum)
Eric Y. Hsiao
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I-banddependence on stretch (primary maximum)
Eric Y. Hsiao
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I-banddependence on stretch (primary maximum)
Eric Y. Hsiao
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I-banddependence on stretch (primary maximum)
Eric Y. Hsiao
1991T
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I-banddependence on stretch (primary maximum)
Eric Y. Hsiao
2000cx
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I-banddependence on stretch (primary maximum)
Eric Y. Hsiao
1999aa
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I-banddependence on stretch (secondary maximum)
Eric Y. Hsiao
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summary
low redshift/JHK band slow temporal evolution of spectral features
k-correction errors small around NIR maximum k-corrections using 1 SN can cause
significant systematic errorshigh redshift/I band epochs of the spectral template should be
stretch corrected there is an apparent spectroscopic sequence
in the I-band OI and CaII triplet features
Eric Y. Hsiao