J/A+A/596/A26 OMC-2 FIR 3 and FIR 4 [OI] maps (Gonzalez-Garcia+, 2016)
Herschel/PACS far-IR spectral imaging of a jet from an intermediate mass
protostar in the OMC-2 region.
Gonzalez-Garcia B., Manoj P., Watson D.M., Vavrek R., Megeath S.T.,
Stutz A.M., Osorio M., Wyrowski F., Fischer W., Tobin J.J.,
Sanchez-Portal M., Diaz Rodriguez A.K., Wilson. T.L.
<Astron. Astrophys. 596, A26 (2016)>
=2016A&A...596A..26G 2016A&A...596A..26G (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Infrared sources ; Spectroscopy
Keywords: ISM: jet and outflows - stars: formation - techniques: spectroscopic
Abstract:
We present the first detection of a jet in the far-IR [OI] lines from
an intermediate mass protostar. We have carried out a Herschel/PACS
spectral mapping study in the [OI] lines of OMC-2 FIR 3 and FIR 4,
two of the most luminous protostars in Orion outside of the Orion
Nebula. The spatial morphology of the fine structure line emission
reveals the presence of an extended photodissociation region (PDR) and
a narrow, but intense jet emission connecting the two protostars. The
jet seen in [OI] emission is spatially aligned with the Spitzer/IRAC
4.5um jet and the CO (6-5) molecular outflow centered on FIR 3. The
mass loss rate derived from the total [OI] 63um line luminosity of
the jet is 7.7*10-6M☉/yr, which is more than an order of
magnitude higher than that measured for typical low mass class 0
protostars. The implied accretion luminosity is significantly higher
than the observed bolometric luminosity of FIR 4, indicating that the
[OI] jet is unlikely to be associated with FIR 4. We argue that the
peak line emission seen toward FIR 4 originates in the terminal shock
produced by the jet driven by FIR 3. The higher mass loss rate that we
find for FIR 3 is consistent with the idea that intermediate mass
protostars drive more powerful jets than their low-mass counterparts.
Our results also call into question the nature of FIR 4.
Description:
The data attached are the [OI] 63 and 145 micron emission line maps,
collected by PACS spectrometer and processed using HIPE v12.1 and
calibration v65; Ott (2010).
Objects:
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RA (2000) DE Designation(s)
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05 35 27.07 -05 10 00.37 FIR 4 = [MWZ90] OMC-2 FIR 4
05 35 26.67 -05 09 35.10 FIR 3 = [MWZ90] OMC-2 FIR 3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 82 2 List of fits maps
fits/* . 2 Individual fits files
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See also:
J/A+A/556/A57 : Transitions in OMC-2 FIR 4 in the far-IR (Kama+, 2013)
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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 48 A23 --- Obs.date Observation date
50 I1 --- NExt Number of extensions in the fits file
52- 53 I2 Kibyte size Size of FITS file
55- 67 A13 --- FileName Name of FITS file, in subdirectory fits
69- 82 A14 --- Title Title of the FITS file
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Acknowledgements:
Beatriz Gonzalez, bgonzale(at)sciops.esa.int
(End) Patricia Vannier [CDS] 23-Aug-2016