Statistical nuclear spin ratios of deuterated ammonia in the pre-stellar core L1544

Open Access

Fig. 1

Footprint of the APEX/LAsMA array on the 8 μm surface brightness images of L1544 observed by the Spitzer satellite. The position of the central pixel is RA $05^{h} 04^{m} 17_{\cdot}^{s} 1$ $\[05^{\mathrm{h}} 04^{\mathrm{m}} 17^\text{s}_\cdot1\]$ , Dec +25°10′43″ (J2000.0). The circle diameter corresponds to the HPBW of APEX at 334 GHz. The core appears as a shadow against the weak mid-infrared background. The bright spots are foreground stars.

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