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arXiv 1306.5946astro-ph.CO
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恒星形成和IRS源的AGN活动在HerMES场中的作用

The roles of star formation and AGN activity of IRS sources in the HerMES fields

Anna Feltre, Evanthia Hatziminaoglou, Antonio Hernán-Caballero, Jacopo Frtiz, Alberto Franceschini, Jamie Bock, Asantha Cooray, Duncan Farrah, Eduardo A. Gonzal… 展开作者

Anna Feltre, Evanthia Hatziminaoglou, Antonio Hernán-Caballero, Jacopo Frtiz, Alberto Franceschini, Jamie Bock, Asantha Cooray, Duncan Farrah, Eduardo A. Gonzalez-Solares, Edo Ibar, Kate G. Isaak, Barbara Lo Faro, Lucia Marchetti, Seb J. Oliver, Mathew J. Page, Dimitra Rigopoulou, Isaac G. Roseboom, Myrto Symeonidis, Mattia Vaccari

摘要:

在这项工作中,我们探讨的影响存在的活动星系核(AGN)的中,远红外(IR)特性的星系,以及同时AGN和星暴活动在这些相同的星系的影响。要做到这一点,我们采用多组分,多波段光谱合成技术的赫歇尔多层河外星系巡天的250微米选定的星系的样本,与IRS光谱可用于所有星系。我们的研究结果证实,包括IRS光谱起着至关重要的作用,在光谱分析的星系与AGN组件,提高最适合的热尘模型(环面)的选择。我们发现的恒星形成率(SFR)来自星暴组件,SFR_IR和SFR_PAH,来自PAH功能,L_PAH的光度,与SFR_FIR采取更高的值比SFR_PAH的红外光度之间的相关性。活动星系核和恒星爆发主导的对象的相关性是不同的。LPAH与星暴分量之比LPAH/LSB对于活动星系核占优的天体几乎是常数,而对于星暴占优的天体则随着LSB的增大而减小。SFR_FIR随着吸积光度L_acc的增加而增加,对于非常明亮的、无遮蔽的活动星系核主导的源,增加不太明显。我们发现热尘埃和冷尘埃成分的质量之间没有相关性。我们解释这是一个非恒定的气体比例驱动的引力效应的活动星系核,而星爆正在进行中。我们也没有发现活动星系核影响冷尘埃成分温度的证据,尽管这一结论主要是基于具有非主导活动星系核成分的天体。我们的结论是,我们的研究结果并没有提供证据表明活动星系核的存在会影响宿主星系中的恒星形成过程,而是这两种现象在很宽的光度范围内同时发生。

英文摘要:

In this work we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in these same galaxies. To do this we apply a multi-component, multi-band spectral synthesis technique to a sample of 250 micron selected galaxies of the Herschel Multi-tiered Extragalactic Survey, with IRS spectra available for all galaxies. Our results confirm that the inclusion of the IRS spectra plays a crucial role in the spectral analysis of galaxies with an AGN component improving the selection of the best-fit hot dust model (torus). We find a correlation between the obscured star formation rate (SFR) derived from the IR luminosity of the starburst component, SFR_IR and SFR_PAH, derived from the luminosity of the PAH features, L_PAH, with SFR_FIR taking higher values than SFR_PAH. The correlation is different for AGN- and starburst-dominated objects. The ratio of L_PAH to that of the starburst component, L_PAH/L_SB, is almost constant for AGN-dominated objects but decreases with increasing L_SB for starburst-dominated objects. SFR_FIR increases with the accretion luminosity, L_acc, with the increase less prominent for the very brightest, unobscured AGN-dominated sources. We find no correlation between the masses of the hot and cold dust components. We interpret this as a non-constant fraction of gas driven by the gravitational effects to the AGN while the starburst is ongoing. We also find no evidence of the AGN affecting the temperature of the cold dust component, though this conclusion is mostly based on objects with a non-dominant AGN component. We conclude that our findings do not provide evidence that the presence of AGN affects the star formation process in the host galaxy, but rather that the two phenomena occur simultaneously over a wide range of luminosities.

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