Astrophys. J., 545, 234-250 (2000/December-2)
Carbon in the N159/N160 complex of the Large Magellanic Cloud.
BOLATTO A.D., JACKSON J.M., ISRAEL F.P., ZHANG X. and KIM S.
Abstract (from CDS):
We present a study of carbon in N159/N160, an H II region complex in the low-metallicity Large Magellanic Cloud. We have mapped this region, which comprises four distinct molecular clouds spanning a wide range of star formation activity, in four transitions: 13CO (J=1⟶0), 12CO (J=2⟶1) and (J=4⟶3), and [C I] (3P1⟶3P0). Combining these data with existing [C II] (2P3/2⟶2P1/2) observations provides a complete picture of the predominant forms of carbon in the gas phase of the ISM. The new CO (J=2⟶1) data show that the complex is immersed in an envelope of extended, low-level emission, undetected by previous (J=1⟶0) mapping efforts. The 12CO (J=2⟶1)/(J=1⟶0) ratio in this envelope is ≳3, a value consistent with optically thin CO emission. The envelope is also relatively bright in [C I] and [C II], and calculations show that it is mostly photodissociated: it appears to be translucent (AV<1). Neutral carbon emission in the complex unexpectedly peaks at the quiescent southern cloud (N159S). In the northern portion of the map (the N160 nebula), the H II regions prominent in [C II] correspond to holes in the [C I] distribution. Overall we find that, while the I_[C II]/ICO_ ratio is enhanced with respect to similar complexes in the Milky Way, the I_[C I]/ICO_ ratio appears to be similar or reduced.
Galaxies: Irregular - Galaxies: ISM - ISM: Clouds - Galaxies: Magellanic Clouds - Radio Lines: ISM - Submillimeter
Table 1: [BJI2000] AN (Nos R1-R2). Table 5: [BJI2000] N159 R (Nos I to III), [BJI2000] N160 R (Nos I to III).
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