Target:
Cep E-mm protostar in the Cepheus OB3 association
Target Description:
Outflow from an intermediate-mass protostar
Instrument:
GREAT
Spectral Elements:
L1 and L2 Channels
Rest Frequency:
1496.923, 1841.346 GHz
Bandwidth:
1.5 GHz
Exposure times:
23 minutes
Observation date:
November 2013
Instrument:
GREAT
Spectral Elements:
L1 Channel
Rest Frequency:
1381.995 GHz
Bandwidth:
1.5 GHz
Exposure times:
15 minutes
Observation date:
July 2011
Proposal ID:
01_0113
Program PI:
A. Gusdorf
Publication:
Lefloch, B., et al., 2015, A&A, 581, A4
[DOI]
http://dx.doi.org/10.1051/0004-6361/201425521
Technical Note
GREAT was used to observe three high-J CO lines, J = 12-11 at 1.382 THz, J = 13-12 at 1.497 THz and J = 16-15 at 1.841 THz, which trace gas that is warmer than that traced by low-J lines accessible at millimeter wavelengths. The instrument was tuned so as to cover the local standard of rest velocities of the important emitting components: the jet (-140 to -100 km s
-1
), the bowshock (-90 to -50 km s
-1
) and the outflow cavity (-50 to -17 km s
-1
). All three components were found to have warm components with T
kin
~ 500-1500K, n(H2) ~ 1-5 x 10
6
cm
-3
, and N(CO) ~ 1.5-10 x 10
16
cm
-2
.