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Astron. Astrophys. 336, L53-L56 (1998)

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2. Observations

On 1997 September 2, we observed L1457 (MBM 12) in the LWS02 mode of the LWS (Clegg et al. 1996) on board ISO. The LWS Observer's Manual contains a detailed description of this mode. The data were taken along two cuts with 10 positions each across a molecular clump (see Fig. 1) observed at CO(1-0) (Zimmermann et al. 1990) and in the vicinity of the positions CO03 and 01 (Pound et al. 1990). The spacing between the two cuts and the individual positions on a cut is [FORMULA]. ISO's beam size is [FORMULA] (FWHM). The cuts are oriented at a position angle (measured East of North) of 135o. The two zero positions are at [FORMULA] = 2h 52m 53[FORMULA]9, [FORMULA] = [FORMULA] and [FORMULA] = 2h 52m 44[FORMULA]8, [FORMULA] = [FORMULA] (1950). The target dedicated time was 2297 s for every fine-structure line and every spectrum was scanned 7 times. Reduction was carried out using standard Off Line Processing v6.11 routines. We used the ISAP 1 package v1.3 for further data reduction.

[FIGURE] Fig. 1. The positions of the two cuts (labeled 1 and 2) observed at [C ii] 158 and [O i] 63 µm overlaid on a CO (1-0) map (Zimmermann & Ungerechts 1990). The HPBW of the CO map is [FORMULA]. The CO map is sampled to [FORMULA]. Indicated are the locations (4 crosses) at which the [C i] 492 GHz and 13CO(2-1) lines were observed (Ingalls et al. 1994). They are labeled as CO03, 01, 10, and 11 from right to left (Pound et al. 1990).

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© European Southern Observatory (ESO) 1998

Online publication: July 27, 1998