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首页> 外文期刊>The Astrophysical journal >SPITZER MID-INFRARED SPECTROSCOPY OF 70 μm-SELECTED DISTANT LUMINOUS INFRARED GALAXIES
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SPITZER MID-INFRARED SPECTROSCOPY OF 70 μm-SELECTED DISTANT LUMINOUS INFRARED GALAXIES

机译：70微米远距离发光红外星系的SPITZER中红外光谱

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摘要

We present mid-infrared spectroscopy obtained with the Spitzer Space Telescope of a sample of 11 optically faint, infrared luminous galaxies selected from a Spitzer MIPS 70 μm imaging survey of the NDWFS Bootes field. These are the first Spitzer IRS spectra presented of distant 70 μm-selected sources. All the galaxies lie at redshifts 0.3 < z < 1.3 and have very large infrared luminosities of L_(ir) ～ (0.1-17)× 10~(12) solar luminosity. Seven of the galaxies exhibit strong emission features attributed to polycyclic aromatic hydrocarbons (PAHs). The average IRS spectrum of these sources is characteristic of classical starburst galaxies but with much larger infrared luminosities. The PAH luminosities of vL_v(7.7μm) ～ (0.4-7) × 10~(11) solar mass imply star formation rates of ～40-720 solar mass yr~(-1). Four of the galaxies show deep 9.7 μm silicate absorption features and no significant PAH emission features (6.2 μm equivalent widths < 0.03 μm). The large infrared luminosities and low vf_v(70 μm)/vf_v(24 μm) flux density ratios suggests that these sources have AGNs as the dominant origin of their large mid-infrared luminosities, although deeply embedded but luminous star-bursts cannot be ruled out. If the absorbed sources are AGN-dominated, a significant fraction of all far-infrared bright, onticallv faint sources mav be dominated bv AGNs.
机译：我们用Spitzer空间望远镜获得的中红外光谱是从NDWFS Bootes场的Spitzer MIPS 70μm成像调查中选择的11个微弱的红外发光星系的样本获得的。这是由遥远的70μm选择源显示的第一个Spitzer IRS光谱。所有的星系都位于红移0.3

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