超天线的VLT/SINFONI积分场谱
VLT/SINFONI Integral Field Spectroscopy of The Super-antennae
摘要：
本文给出了ULIRG IRAS 19254-7245（超天线）的H波段和K波段VLT/SINFONI积分场谱的结果，这是一个包含活动星系核的相互作用双星系系统。深K波段光谱揭示了PaAlpha产生于位置角为330度且倾角i=40-55度的翘曲盘中。H2的运动学参数与PaAlpha相似。检测到两条高电离发射线[SiVI]和[AlIX]，我们将在1.94微米处观察到的线确定为[NiII]。稀释的非恒星连续谱，这是以前检测到的，已经衰减，和H波段连续谱发射是与纯恒星发射一致。根据H2的发射线比，很可能在中心1千秒差距区域H2是由密集云层中的紫外荧光激发的，而激波激发则占主导地位。在核区域外检测到的非常低的PaAlpha与H2线比和靠近核的非热邻/对位比（~2.0 - 2.5）支持这种情况。
英文摘要：
We present the results of H- and K-band VLT/SINFONI integral field spectroscopy of the ULIRG IRAS 19254-7245 (The Super-antennae), an interacting double galaxy system containing an embedded AGN. Deep K-band spectroscopy reveals PaAlpha arising in a warped disc with position angle of 330 degree and an inclination i=40-55 degree. The kinemetric parameters derived for H2 are similar to PaAlpha. Two high-ionization emission lines, [SiVI] and [AlIX], are detected and we identify as [NiII] the line observed at 1.94 micron. Diluting non-stellar continuum, which was previously detected, has decayed, and the H-band continuum emission is consistent with pure stellar emission. Based on H2 emission line ratios it is likely that at the central 1-kpc region H2 is excited by UV fluorescence in dense clouds while shock excitation is dominant further out. This scenario is supported by very low PaAlpha to H2 line ratio detected outside the nuclear region and non-thermal ortho/para ratios (~2.0 - 2.5) close to the nucleus.
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