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arXiv 0906.5271astro-ph.CO
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~0.9 mJy样本:150个红外发光的24微米选定星系在0.3 <z <3.5的中红外光谱目录

The ~0.9 mJy sample: A mid-infrared spectroscopic catalog of 150 infrared-luminous, 24 micron selected galaxies at 0.3<z<3.5

Kalliopi M. Dasyra, Lin Yan, George Helou, Anna Sajina, Dario Fadda, Michel Zamojski, Lee Armus, Bruce Draine, David Frayer

摘要:

本文给出了斯皮策河外首次巡天中150个红外发光星系的中红外光谱表。样品被选择为在24微米处比~0.9 mJy更亮,并且其具有在范围[0.3,3.5]中的z分布,其中峰在z = 1处。它主要包括z> 1的超亮红外星系和z <1的亮红外星系,根据它们的单色14微米光度估计。光谱主要由活动星系核(AGN)连续体控制的源数量为49个,而39个源具有强烈的恒星形成相关特征。对于这种分类,我们使用了11.3微米多环芳烃(PAH)特征的等效宽度(EW)。几个中/高z星爆有较高的PAH EW比当地ULIRGs。随着z和光度的增加,AGN的活动增加,观察到的基础上减少EW的多环芳烃和增加的[NeIII]/[NeII]比。光谱叠加导致检测到3.3微米PAH、H2 0 - 0 S(1)和S(3)线以及[NeV]线。我们观察到的多环芳烃的流量比在堆叠的光谱中的红外发光星系的z或光度,这不是由于消光效应的差异。当将观察到的星系放置在红外颜色图上时,我们发现定义AGN的楔形包括大多数具有连续谱主导光谱的源,但也包含许多星暴。11.3微米PAH EW和从HST数据测量的H波段有效半径的比较表明,EW> 2微米的源通常比~3 kpc更延伸。然而,有没有很强的相关性之间的MIR光谱类型和近红外范围的来源。[摘要]。

英文摘要:

We present a catalog of mid-infrared (MIR) spectra of 150 infrared (IR) luminous galaxies in the Spitzer extragalactic first look survey obtained with IRS on board Spitzer. The sample is selected to be brighter than ~0.9 mJy at 24 micron and it has a z distribution in the range [0.3,3.5] with a peak at z=1. It primarily comprises ultraluminous IR galaxies at z>1 and luminous IR galaxies at z<1, as estimated from their monochromatic 14 micron luminosities. The number of sources with spectra that are dominated by an active galactic nucleus (AGN) continuum is 49, while 39 sources have strong, star-formation related features. For this classification, we used the equivalent width (EW) of the 11.3 micron polycyclic aromatic hydrocarbon (PAH) feature. Several intermediate/high z starbursts have higher PAH EW than local ULIRGs. An increase in the AGN activity is observed with increasing z and luminosity, based on the decreasing EW of PAHs and the increasing [NeIII]/[NeII] ratio. Spectral stacking leads to the detection of the 3.3 micron PAH, the H2 0-0 S(1) and S(3) lines, and the [NeV] line. We observe differences in the flux ratios of PAHs in the stacked spectra of IR-luminous galaxies with z or luminosity, which are not due to extinction effects. When placing the observed galaxies on IR color-color diagrams, we find that the wedge defining AGN comprises most sources with continuum-dominated spectra, but also contains many starbursts. The comparison of the 11.3 micron PAH EW and the H-band effective radius, measured from HST data, indicates that sources with EW>2 micron, are typically more extended than ~3 kpc. However, there is no strong correlation between the MIR spectral type and the near-IR extent of the sources. [Abridged].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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