J/A+A/555/A8 L1448 and HH211 CO(6-5) velocity maps (Gomez-Ruiz+, 2013)
Warm gas in protostellar outflows.
I. Flows from the low-mass protostars in L1448 and HH211.
Gomez-Ruiz A.I., Wyrowski F., Gusdorf A., Leurini S., Menten K., Guesten R.
<Astron. Astrophys. 555, A8 (2013)>
=2013A&A...555A...8G 2013A&A...555A...8G
ADC_Keywords: YSOs
Keywords: ISM: jets and outflows - star formation -
ISM: individual objects: L1448 - ISM: individual objects: HH211 -
shock waves
Abstract:
Observations of CO rotational transitions in the 0.3-0.4 millimeter
range, now possible from exceptional sites on the ground, provide the
opportunity of studing the warm component of molecular outflows in
star-forming regions. This study aims to characterize the role of the
warm gas in high-velocity and collimated outflows from Class 0
low-mass protostars. We used the CHAMP+ heterodyne array on the APEX
telescope to map the CO (6-5) and CO (7-6) emission in the well-known
Class 0 outflows L1448-mm and HH211-mm. We complement these data with
13CO (6-5) observations and also with previous low-J CO
observations. The CO (6-5) and (7-6) emission was detected to be
tracing the outflow lobes. In L1448, extremely high-velocity (EHV)
emission was detected in both transitions. In HH211, high-velocity CO
(6-5) emission was detected to be tracing the regions close to the
central object, but it was also found close to the bow-shock regions
seen in the mid-IR. A large velocity gradient code applied to these
and the complementary low-J CO data revealed the high-velocity
components to be dense (105cm^-3) and warm (T>200K) gas, in
agreement with previous observations of shock tracers such as SiO. The
high-velocity emission of these mid-J CO transitions are very good
tracers of the inner highly excited part of outflows, which possibly
is molecular material related to the underlying jet. In addition,
these transitions are also strong at the bow-shock positions, which
make them a good tool for probing these environments.
Description:
Here we provide the CO(6-5) high-velocity maps presented in Figures 2
and 9. The velocity range in which in the integrated emission has been
calculated is described in the paper.
Objects:
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RA (2000) DE Designation(s)
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03 25 38.9 +30 44 05 L1448 = LDN 1448
03 43 56.8 +32 00 50 HH211 = IRAS 03407+3152
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 92 4 List of FITS files
fits/* . 4 Individual FITS files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 F3.1 arcsec/pix Scale [4.5] Scale of the image
24- 25 I2 pix Nx [40/46] Number of pixels along X-axis
26 A1 --- --- [x]
27- 28 I2 pix Ny [39/83] Number of pixels along Y-axis
30- 32 I3 K.km/s TdVl Lower value of integrated emission interval
34- 35 I2 K.km/s TdVu Upper value of integrated emission interval
37- 54 A18 --- FileName Name of FITS file in the subdirectory fits
56- 92 A37 --- Title Title of the file
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Acknowledgements:
Arturo I. Gomez-Ruiz, arturogr(at)arcetri.astro.it
(End) Arturo Gomez-Ruiz [INAF, Arcetri], Patricia Vannier [CDS] 27-May-2013