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Dynamic Structure of the Horsehead Nebula

Published online by Cambridge University Press:  04 August 2017

H. Suzuki ,
N. Kaifu ,
M. Ohishi ,
T. Miyaji  and
S. Ishikawa
H. Suzuki
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, Tokyo University, Japan
N. Kaifu
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, Tokyo University, Japan
M. Ohishi
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, Tokyo University, Japan
T. Miyaji
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, Tokyo University, Japan
S. Ishikawa
Affiliation:
Nobeyama Radio Observatory, Tokyo Astronomical Observatory, Tokyo University, Japan

Extract

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We have made a preliminary map of the Horsehead nebula in CO (J=1-0) using the NRO 45-m telescope. The HPBW is 15″, the grid spacing 10″, and the velocity resolution is ∼0.1km/s. Figure 1 shows the integrated intensity with a velocity interval 10-11.5 km/s, which we found represents well the shape of the dark globule of the Horsehead. The coincidence of the CO feature and the dark nebulocity is strikingly well, especially at the sharp edges in the south and in the west (from the neck to the ears). The quality of the data are not satisfactory, though. The typical noise level is 1 K rms in TA, and the accuracies of the pointing and the intensity calibration is rather low due to the bad weather during the observation. Some scanning effects in the intensities can be recognized in Figure 1. One of the reason why the gap obtically seen beneath the jaw is not clear in the CO map may be attributed to the pointing errors.

Type
I. Star Forming Processes in the Solar Neighborhood
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 90 - 91
Copyright
Copyright © Reidel 1987 

References

Reipurth, B., and Bouchet, P. 1984, Astron. and Astrophys. 137, L1 Google Scholar
Stark, A.A., and Bally, J. 1982, “Regions of Recent Star Formation“, Ed. Roger, R.S., and Dewdny, P.E. (Reidel), p. 329.Google Scholar