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NICMOS Narrowband Images of OMC-1*

机译:OMC-1 *的NICMOS窄带图像

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We present images of a 90''×90'' field centered on the Becklin-Neugebauer object (BN) in OMC-1, taken with the Near-Infrared Camera and Multiobject Spectrometer (NICMOS) aboard the Hubble Space Telescope. The observed lines are H2 1-0 S(1), Paα, [Fe II] 1.64 μm, and the adjacent continua. The region is rich in interesting structures. The most remarkable are streamers of H2 emission that extend from 15'' to 50'' from IRc2, seen here in unprecedented detail. Unlike the northern H2 "fingers," these inner structures do not exhibit significant [Fe II] emission at their tips, which we suggest is due to lower excitation. These observations also show that the morphological details of the Paα and [Fe II] emission (both imaged for the first time in this region) bear a striking resemblance to that of the Hα and [S II] emission previously observed with WFPC2. This implies that these IR and optical lines are produced by radiative excitation on the surface of the molecular cloud. The Paα morphology of HH 202 is also very similar to its Hα and [O III] emission, again suggesting that the extended Paα emission in this object is photoexcited by the Trapezium, as has been suggested for the optical emission. We find evidence of shock-excited [Fe II] in HH 208, where it again closely follows the morphology of [S II]. There is also H2 coincident with the [S II] and [Fe II] emission, which may be associated with HH 208. Finally, we note some interesting continuum features: diffuse "tails" trailing from IRc3 and IRc4, more extensive observations of the "crescent" found by Stolovy et al., and new observations of a similar oval object nearby. We also find a V-shaped region that may be the boundary of a cavity being cleared by IRc2.
机译:我们用哈勃太空望远镜上的近红外相机和多目标光谱仪(NICMOS)拍摄了OMC-1中Becklin-Neugebauer物体(BN)中心的90''×90''场的图像。观察到的线是H2 1-0 S(1),Paα,[Fe II] 1.64μm和相邻的连续体。该地区有许多有趣的结构。最引人注目的是从IRc2发出的H2排放物流从15英寸延伸到50英寸,在此以空前的细节显示。与北部的H2“手指”不同,这些内部结构在其尖端没有表现出明显的[Fe II]发射,我们认为这是由于较低的激发。这些观察结果还表明,Paα和[Fe II]发射的形态学细节(均在该区域首次成像)与以前用WFPC2观察到的Hα和[S II]发射的形态极为相似。这意味着这些IR和光学线是由分子云表面上的辐射激发产生的。 HH 202的Paα形态也与它的Hα和[O III]发射非常相似,再次表明该对象中扩展的Paα发射被梯形光激发,正如光学发射所建议的那样。我们在HH 208中发现了震荡激发的[Fe II]的证据,它再次严格遵循[S II]的形态。还存在与[S II]和[Fe II]发射一致的H2,这可能与HH 208有关。最后,我们注意到一些有趣的连续谱特征:IRc3和IRc4后面的弥散“尾巴”,对Hc 208的更广泛观察Stolovy等人发现的“新月形”,以及附近类似椭圆形物体的新观测结果。我们还发现了一个V形区域,该区域可能是IRc2正在清除的空腔的边界。

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