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第1411回 天文学教室談話会

日時

2015年5月14日(木) 15:00

場所

合同C棟N507

講演者

Abdurro'uf (東北大学天文学専攻)

題目

Spatially Resolved Star Formation Rate (SFR) Density and Stellar Mass Density of Galaxies in The Local Universe

要旨


This research aims to get spatially resolved star formation rate and stellar mass of galaxies in the local universe and compare the distribution with what have been observed at z~1. Multiband images of 443 local galaxies at the redshift range of 0.01< z <0.02 will be used in this research. In order to constrain galaxy's stellar mass, age, and dust-extinction, seven band images (FUV, NUV, u, g, r, i, and z band) from GALEX and SDSS DR10 are used. To get the resolved stellar population properties of galaxy, so called pixel-to-pixel spectral energy distribution (SED) fitting is used. In this method, observed multiband photometric data (observed SEDs) of each galaxy pixel is compared (i.e. fitted) to the set of SED templates. Model SEDs are generated using GALAXEV (BC03) by varying some parameters, such as metallicity, function of star formation history (in this research, exponentially declining function with varying e-folding times is used), and stellar age. To consider the effect of dust extinction, dust attenuation curve by Calzetti, 1997 is used. So far spatially resolved star formation rate and stellar mass of 46 galaxies have been calculated. Calculated SFR distribution of those galaxies show cosmological evolution from those of galaxies at z~1, where total SFR is decreasing from z~1 to z~0.015 and their distribution show that galaxies at higher redshift likely to have higher SFR inside of their effective radius but galaxies at lower redshift (local) shows higher star formation in outside of their effective radius. This research will provide a tool to study internal spatial distribution of galaxy properties, and in future, by calculating large number of galaxies with resolved SFR and stellar mass from low redshift up to such high redshift to study the cosmological evolution of mode of star formation in the galaxies may can help to better understand the galaxy evolutionary process.

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【The Colloquium Committee in 2015】
Kenji Toma (toma<at>astr.tohoku.ac.jp)
Yurina Mizuno
Kohei Miyazawa
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