Mid-Infrared Spectroscopy of Two Luminous Submillimeter Galaxies at z ~ 2.8

Mid-Infrared Spectroscopy of Two Luminous Submillimeter Galaxies at z ~ 2.8
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z ~ 2 8 处两个发光亚毫米星系的中红外光谱

DOI:
10.1086/431217
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发表时间:
2005
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
Lehnert
Lehnert
中科院分区:
--
文献类型:
--
作者:
Valiante;Genzel;Tacconi;Lehnert

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利用斯皮策空间望远镜上的红外光谱仪(IRS),我们获得了两个明亮亚毫米星系的静止系中红外光谱。SMM J 02399 -0136在z= 2.81处显示了多环芳烃(PAH)发射特征和中红外连续谱的叠加,表明星星形成和康普顿厚度的活动星系核对其热光度的贡献显著且大致相等。我们从IRS光谱中得到MM J154127+ 6616的新红移z= 2.80,发现该天体主要是由星暴PAH辐射所控制。静止帧中到远红外光谱能量分布与这些亚毫米星系是局部超亮红外星系的放大版本是一致的。中红外光谱支持亚毫米星系是极端星星形成的场所,并代表了大质量星系形成的关键阶段。
Using the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope, we have obtained rest-frame mid-infrared spectroscopy of two bright submillimeter galaxies. SMM J02399-0136 at z= 2.81 shows a superposition of polycyclic aromatic hydrocarbon (PAH) emission features and a mid-infrared continuum, indicating significant and roughly equal contributions to its bolometric luminosity from star formation and from a Compton-thick active galactic nucleus. We derive a new redshift of z= 2.80 for MM J154127+ 6616 from the IRS spectrum and find this object is dominated by starburst PAH emission. The rest-frame mid-to far-infrared spectral energy distributions are consistent with these submillimeter galaxies being scaled-up versions of local ultraluminous infrared galaxies. The mid-infrared spectra support the scenario that submillimeter galaxies are sites of extreme star formation and represent a key phase in the formation of massive galaxies.
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