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arXiv 1111.3814astro-ph.GAastro-ph.CO
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AKARI/IRC宽带中红外数据作为恒星形成率的指标

AKARI/IRC Broadband Mid-infrared data as an indicator of Star Formation Rate

F. -T. Yuan, T. T. Takeuchi, V. Buat, S. Heinis, E. Giovannoli, K. L. Murata, J. Iglesias-Paramo, D. Burgarella

摘要:

AKARI/红外相机(IRC)点源目录提供了大量的通量数据在{ \it S9 W}($9\ {\rm μm}$)和{ \it L18 W}($18\ {\rm μm}$)波段。为了利用IRC数据计算恒星形成率(SFR),我们分析了153个邻近星系的红外选择GALEX-SDSS-2 MASS-AKARI(IRC/远红外探测器)样本。远红外通量由AKARI漫射图获得,以校正点扩散函数光度法对扩展源的低估。用光谱能量分布拟合程序CIGALE计算了这些星系的SFR。尽管这些谱带具有复杂的特征,但{ \it S9 W}和{ \it L18 W}的辐射都与星系的SFR有关。首次提出了使用{ \it S9 W}和{ \it L18 W}的SFR校准。这些校准同意与以前的作品的基础上斯皮策数据内的散射,并应适用于富含尘埃的星系。

英文摘要:

AKARI/Infrared Camera (IRC) Point Source Catalog provides a large amount of flux data at {\it S9W} ($9\ {\rm μm}$) and {\it L18W} ($18\ {\rm μm}$) bands. With the goal of constructing Star-Formation Rate(SFR) calculations using IRC data, we analyzed an IR selected GALEX-SDSS-2MASS-AKARI(IRC/Far-Infrared Surveyor) sample of 153 nearby galaxies. The far-infrared fluxes were obtained from AKARI diffuse maps to correct the underestimation for extended sources raised by the point-spread function photometry. SFRs of these galaxies were derived by the spectral energy distribution fitting program CIGALE. In spite of complicated features contained in these bands, both the {\it S9W} and {\it L18W} emission correlate with the SFR of galaxies. The SFR calibrations using {\it S9W} and {\it L18W} are presented for the first time. These calibrations agree well with previous works based on Spitzer data within the scatters, and should be applicable to dust-rich galaxies.

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