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A starburst origin of the OH- megamaser emission from the galaxy Arp220

机译：星系Arp220的OH-megamaser辐射的星爆起源

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Ultraluminous infrared galaxies have been known for more than a decade, but the source of their very large far-infrared luminosities remains controversial. It may reflect a quasar-like active nucleus surrounded by a torus of dense gas and dust, the latter absorbing the energetic photons from the nuclear region and re-emitting at infrared wavelengths, or a huge burst of massive-star formation in dense dusty clouds of molecular gas close to the nucleus, which heats the surrounding dust. A number of ultraluminous galaxies are also a source of OH-megamaser emissions (intense laser-like spectral lines at microwave frequencies), an observation that may hold important clues as to the main power source in these galaxies. A general feature of many models is that the masers are pumped radiatively by the absorption of infrared photons. Identifying the source of the maser pump may therefore indicate whether the ultimate energy source is a burst of star formation, or an active nucleus. Here we report the detection of a strong mid-infrared OH absorption line in the prototypical megamaser and ultraluminous galaxy, Arp220. We find that the power absorbed in this line alone is sufficient to pump the megamaser emission seen at radio wavelengths. Moreover, the warm, extended nature of the pumping region is suggestive of a starburst origin for the ultraluminous infrared emissions.
机译：超发光红外星系已经有十多年的历史了，但是其超远红外发光度的来源仍然存在争议。它可能反映出由密集的气体和尘埃环包围的类星体状活动核，后者吸收核区的高能光子并在红外波长下重新发射，或者在浓密的尘埃云中爆发出大量恒星形成靠近原子核的分子气体会加热周围的尘埃。许多超发光星系也是OH-megamaser发射的源（微波频率下类似激光的强光谱线），这一发现可能为这些星系的主要动力提供了重要线索。许多模型的一般特征是，激子通过吸收红外光子以辐射方式泵浦。因此，识别激射泵的来源可能会指示最终能源是恒星爆发还是活跃的核。在这里，我们报告检测到在原型巨型激光器和超发光星系Arp220中存在强的中红外OH吸收线。我们发现仅在这条线路中吸收的功率就足以泵浦在无线电波长下看到的大质量辐射。此外，泵浦区域的温暖，扩展的性质暗示了超发光红外辐射的星爆起源。

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