SIMBAD references

2017ApJ...835....3L - Astrophys. J., 835, 3-3 (2017/January-3)

Externally heated protostellar cores in the Ophiuchus star-forming region.

LINDBERG J.E., CHARNLEY S.B., JORGENSEN J.K., CORDINER M.A. and BJERKELI P.

Abstract (from CDS):

We present APEX 218 GHz observations of molecular emission in a complete sample of embedded protostars in the Ophiuchus star-forming region. To study the physical properties of the cores, we calculate H2CO and c-C3H2 rotational temperatures, both of which are good tracers of the kinetic temperature of the molecular gas. We find that the H2CO temperatures range between 16 K and 124 K, with the highest H2CO temperatures toward the hot corino source IRAS 16293-2422 (69-124 K) and the sources in the ρ Oph A cloud (23-49 K) located close to the luminous Herbig Be star S1, which externally irradiates the ρ Oph A cores. On the other hand, the c-C3H2 rotational temperature is consistently low (7-17 K) in all sources. Our results indicate that the c-C3H2 emission is primarily tracing more shielded parts of the envelope whereas the H2CO emission (at the angular scale of the APEX beam; 3600 au in Ophiuchus) mainly traces the outer irradiated envelopes, apart from in IRAS 16293-2422, where the hot corino emission dominates. In some sources, a secondary velocity component is also seen, possibly tracing the molecular outflow.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrochemistry - ISM: individual objects: Ophiuchus - ISM: molecules - radiative transfer - stars: formation - stars: formation

VizieR on-line data: <Available at CDS (J/ApJ/835/3): table1.dat table3.dat table4.dat>

Status in Simbad:  could be processed

Simbad objects: 60

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2019.10.22-17:05:46

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