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arXiv 1106.4022astro-ph.COastro-ph.GA
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Herschel KINGFISH巡天中近星系团的尘埃和恒星辐射

The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey

Ramin A. Skibba, Charles W. Engelbracht, Daniel Dale, Joannah Hinz, Stefano Zibetti, Alison Crocker, Brent Groves, Leslie Hunt, Benjamin D. Johnson, Sharon Meid… 展开作者

Ramin A. Skibba, Charles W. Engelbracht, Daniel Dale, Joannah Hinz, Stefano Zibetti, Alison Crocker, Brent Groves, Leslie Hunt, Benjamin D. Johnson, Sharon Meidt, Eric J. Murphy, Philip Appleton, Lee Armus, Alberto Bolatto, Bernhard Brandl, Daniela Calzetti, Kevin Croxall, Maud Galametz, Karl D. Gordon, Robert C. Kennicutt, Jin Koda, Oliver Krause, Edward Montiel, Hans-Walter Rix, Helene Roussel, Karin Sandstrom, Marc Sauvage, Eva Schinnerer, J. D. Smith, Fabian Walter, Christine D. Wilson, Mark Wolfire

摘要:

利用赫歇尔空间天文台新的远红外成像和从紫外到亚毫米波长的辅助数据,我们以尽可能经验和模型独立的方式估计了KINGFISH调查中62个附近星系的尘埃和恒星的总发射。我们收集和利用这些数据,以便从光谱能量分布(SED)中精确测量有多少恒星辐射被尘埃拦截和重新辐射,以及这个数量如何随星系特性而变化。通过包括SPIRE数据,我们对冷尘埃颗粒的发射比以前在较短波长下的分析更敏感,从而可以更准确地估计尘埃温度和质量。尘埃/恒星通量比,我们通过整合的SED测量,有近三十年的范围。列入SPIRE数据表明,根据没有达到这些远红外波长的数据进行的估计偏低。我们发现,尘埃/恒星的流量比随形态和总红外光度。我们还发现,尘埃/恒星的流量比有关的气相金属丰度,而尘埃/恒星的质量比是如此。尘埃/恒星通量和尘埃/恒星质量之间的大量分散表明前者是后者的一个穷人代理。比较尘埃/恒星通量比和尘埃温度,我们发现,早期类型往往有稍微温暖的温度比螺旋星系,这可能是由于更强烈的星际辐射场,或不同的尘埃颗粒组成。最后,我们发现,早期型和早期型螺旋有很强的相关性之间的尘埃/恒星的流量比和特定的恒星形成率,这表明,相对明亮的远红外辐射的一些星系是由于正在进行的恒星形成和辐射场的老恒星。

英文摘要:

Using new far-infrared imaging from the Herschel Space Observatory with ancillary data from ultraviolet to submillimeter wavelengths, we estimate the total emission from dust and stars of 62 nearby galaxies in the KINGFISH survey in a way that is as empirical and model-independent as possible. We collect and exploit these data in order to measure from the spectral energy distributions (SEDs) precisely how much stellar radiation is intercepted and re-radiated by dust, and how this quantity varies with galaxy properties. By including SPIRE data, we are more sensitive to emission from cold dust grains than previous analyses at shorter wavelengths, allowing for more accurate estimates of dust temperatures and masses. The dust/stellar flux ratio, which we measure by integrating the SEDs, has a range of nearly three decades. The inclusion of SPIRE data shows that estimates based on data not reaching these far-IR wavelengths are biased low. We find that the dust/stellar flux ratio varies with morphology and total IR luminosity. We also find that dust/stellar flux ratios are related to gas-phase metallicity, while the dust/stellar mass ratios are less so. The substantial scatter between dust/stellar flux and dust/stellar mass indicates that the former is a poor proxy of the latter. Comparing the dust/stellar flux ratios and dust temperatures, we show that early-types tend to have slightly warmer temperatures than spiral galaxies, which may be due to more intense interstellar radiation fields, or to different dust grain compositions. Finally, we show that early-types and early-type spirals have a strong correlation between the dust/stellar flux ratio and specific star formation rate, which suggests that the relatively bright far-IR emission of some of these galaxies is due to ongoing star formation and the radiation field from older stars.

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