IRCS/Subaru对73 P-B/Schwassmann-Wachmann 3彗星内部彗发中水的观测：空间分辨的旋转温度和正交帕拉比
IRCS/Subaru Observations of Water in the Inner Coma of Comet 73P-B/Schwassmann-Wachmann 3: Spatially Resolved Rotational Temperatures and Ortho-Para Ratios
摘要：
彗星73 P-B/Schwassmann-Wachmann 3于2006年5月10日在地球中心距离0.074 AU处被IRCS/Subaru观测到。在2.9微米附近的非共振荧光中检测到多条H2O发射线。在我们观察的持续时间（3小时）期间，未发现总H2O产生速率的显著变化。H2O旋转温度和邻-对丰度比进行了测量的几个位置的彗发。从两个不同的时间间隔提取的温度显示出非常相似的空间分布。对于这两个，旋转温度从~110 K下降到~90 K的投影距离从~5到~30 km的增加。我们没有发现昏迷中氧磷比变化的证据。对于所有空间分辨测量，H2O邻-对位比与统计平衡值（3.0）一致。这意味着核自旋温度高于~ 45 K。
英文摘要：
Comet 73P-B/Schwassmann-Wachmann 3 was observed with IRCS/Subaru at geocentric distance of 0.074 AU on UT 10 May 2006. Multiple H2O emission lines were detected in non-resonant fluorescence near 2.9 microns. No significant variation in total H2O production rate was found during the (3 hour) duration of our observations. H2O rotational temperatures and ortho-to-para abundance ratios were measured for several positions in the coma. The temperatures extracted from two different time intervals show very similar spatial distributions. For both, the rotational temperature decreased from ~110 K to ~90 K as the projected distance from the nucleus increased from ~5 to ~30 km. We see no evidence for OPR change in the coma. The H2O ortho-para ratio is consistent with the statistical equilibrium value (3.0) for all spatially resolved measurements. This implies a nuclear spin temperature higher than ~ 45 K.
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