Behavior of Reddenings in the Color-Magnitude & Color-Color Diagrams of SDSS Filters 김성수, 이명균.

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Presentation transcript:

Behavior of Reddenings in the Color-Magnitude & Color-Color Diagrams of SDSS Filters 김성수, 이명균

Estimating the Extinction Photometric data in at least two bands CMD or CCD Color excess & extinction law --> Extinction People usually assume that the reddening vector is linear a single reddening vector can be applied for all kinds of objects

CMD

CCD

SED-Dependence & Nonlinearity of Extinction Effective wavelength : The effective wavelength varies for different SEDs. The effective wavelength shifts toward the longer wavelengths as the extinction increases. This effect is more significant for a filter with a larger bandwidth.

Previous Studies First studies on the nonlinearity Blanco (1956, 1957) Hiltner & Joihnson (1956) Wildey (1963) First thorough study on the SED-dependence Grebel & Roberts (1995) Called this “heterochromatic extinction”. Infrared bands Kim et al. (2005) : H-K colors Kim, Lee & Figer (2006) : J-K colors

SDSS Photometric Data SEGUE is mapping the Milky Way on a regular grid extending through the Galactic plane. SEGUE will observe many star clusters and galaxies in the zone of avoidance.

Our Calculations Isochrones Galaxies For star clusters in the Milky Way & nearby galaxies Kurucz models for synthetic stellar spectra Padova models for isochrones Galaxies For spatially unresolved galaxies Bruzual & Charlot (2003) for the stellar population synthesis model Buzzoni’s (2005) recipe for the galaxy build-up

Reddening in Isochrones

Our “Reference” Extinction Law An extinction law calculated for the average spectrum of stars in the 109 yr, solar-metallicity isochrone weighted with a Salpeter mass function u’ g’ r’ i’ z’ Ai/A5500 1.5698 1.2000 0.8786 0.6738 0.4889

Errors in Dereddening Isochrone CMDs (1/2)

Errors in Dereddening Isochrone CMDs (2/2)

Errors in Dereddening Isochrone CCDs

Galaxy SEDs

Errors in Dereddening Galaxy CMDs (1/2)

Errors in Dereddening Galaxy CMDs (2/2)

Errors in Dereddening Galaxy CCDs

Errors in Dereddening Galaxy CMDs (109 yr, different redshifts)

SDSS + GALEX Galaxy CMDs

Summary The SED-dependence and the nonlinearity are non-negligible for SDSS filters as well. Extinction can be over- or under-estimated by up to 12% for Ai<5 mag. Age is a more important factor than metallicity and redshift. CMDs and CCDs involving the g’ filter have a much larger sensitivity. CCDs are no better than CMDs. Dereddening with the color that has a longer baseline is desirable. Colors only from r’, i’, and z’ give stable reddening.