2012A&A...542L..11E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST20:24:21

2012A&A...542L..11E - Astronomy and Astrophysics, volume 542, L11-11 (2012/6-1)

SOFIA observations of CO (12-11) emission along the L1157 bipolar outflow.

EISLOEFFEL J., NISINI B., GUESTEN R., WIESEMEYER H. and GUSDORF A.

Abstract (from CDS):

Carbon monoxide is an excellent tracer of the physical conditions of gas in molecular outflows from young stars. To understand the outflow mechanism we need to investigate the origin of the molecular emission and the structure and interaction of the outflowing molecular gas. Deriving the physical parameters of the gas will help us to trace and understand the various gas components in the flow. We observed CO (12-11) line emission at various positions along the L1157 bipolar outflow with GREAT aboard SOFIA. Comparing these new data with CO (2-1), we find basically constant line ratios along the outflow and even at the position of the source. These line ratios lead us to estimates of 105 to 106cm–3 for the gas density and 60 to 100K for the gas temperature of the outflowing gas. The constrained density and temperature values indicate that we are mostly tracing a low-velocity gas component everywhere along the outflow, which is intermediate between the already known cold gas component, which gets entrained into the flow, and the hot gas, which gets shocked in the outflow.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - stars: formation - stars: pre-main sequence - stars: low-mass - infrared: ISM - stars: mass-loss

CDS comments: Table 1 L1157-1 not in SIMABD.

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [TB95] R0 red 20 39 00 +68 03.3           ~ 14 0
2 [TB95] R1 red 20 39 00 +68 04.5           ~ 13 0
3 HH 375 Y*O 20 39 06.2 +68 02 15           ~ 158 0
4 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 484 0
5 [DE95] LDN 1157 B2 out 20 39 09.3 +68 00 44           ~ 59 0
6 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 180 0

    Equat.    Gal    SGal    Ecl

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2020.07.06-20:24:21

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