SIMBAD references

2015ApJS..217...30L - Astrophys. J., Suppl. Ser., 217, 30 (2015/April-0)

The warm CO gas along the UV-heated outflow cavity walls: a possible interpretation for the Herschel/PACS CO spectra of embedded YSOs.


Abstract (from CDS):

A fraction of the mid-J (J = 14-13 to J = 24-23) CO emission detected by the Herschel/Photodetector Array Camera and Spectrometer observations of embedded young stellar objects (YSOs) has been attributed to the UV-heated outflow cavity walls. We have applied our newly developed self-consistent models of photon-dominated-region (PDR) and non-local-thermal-equilibrium-line Radiative transfer In general Grid to the Herschel far-infrared observations of 27 low-mass YSOs and one intermediate-mass YSO, NGC 7129-FIRS2. When the contribution of the hot component (traced by transitions of J > 24) is removed, the rotational temperature of the warm component is nearly constant with ∼250 K. This can be reproduced by the outflow cavity wall (n ≥ 106/cm3, log G0/n ≥ -4.5, log G0 ≥ 3, Tgas≥ 300 K, and X(CO) ≥ 10–5) heated by a UV radiation field with a blackbody temperature of 15,000 or 10,000 K. However, a shock model combined with an internal PDR will be required to determine the quantitative contribution of a PDR relative to a shock to the mid-J CO emission.

Abstract Copyright:

Journal keyword(s): astrochemistry - circumstellar matter - infrared: ISM - methods: numerical - photon-dominated region, PDR - radiative transfer

Simbad objects: 33

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