J/A+A/466/949 Velocities of OMC-1 flows (Nissen+, 2007)
Observations of spatial and velocity structure in the Orion molecular cloud.
Nissen H.D., Gustafsson M., Lemaire J.L., Clenet Y., Rouan D., Field D.
<Astron. Astrophys., 466, 949-968 (2007)>
=2007A&A...466..949N 2007A&A...466..949N
ADC_Keywords: Molecular clouds ; Interstellar medium ; Space velocities
Keywords: ISM: jets and outflows - ISM: structure - stars: formation -
stars: circumstellar matter - ISM: kinematics and dynamics -
ISM: molecules
Abstract:
Observations are reported of H2 IR emission in the S(1) v=1-0 line
at 2.121µm in the Orion Molecular Cloud, OMC1, using the GriF
instrument on the Canada-France-Hawaii Telescope. GriF uses a
combination of adaptive optics and Fabry-Perot interferometry,
yielding a spatial resolution of 0.15" to 0.18" and velocity
discrimination as high as 1km/s. 193 bright H2 emission regions can
be identified in OMC1. The general characteristics of these features
are described in terms of radial velocities, brightness and spatial
displacement of maxima of velocity and brightness, the latter to yield
the orientation of flows in the plane of the sky. Strong spatial
correlation between velocity and bright H2 emission is found and
serves to identify many features as shocks.
Description:
The observations were performed on the night of December 5th 2000 at
the 3.6m CFHT, using the then new instrument GriF.
Objects:
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RA (2000) DE Designation(s)
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05 35 14.91 -05 22 39.31 TCC 0016 = TCC 16
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 53 87 Features identified in OMC1 in Peak 1 (1-NN)
tablea2.dat 53 50 Features identified in OMC1 in Peak 2 (2-NN)
tablea3.dat 53 56 Features identified in OMC1 in region B (B-NN)
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See also:
J/A+A/392/239 : IR survey of outflows in Orion A (Stanke+, 2002)
Byte-by-byte Description of file: tablea[123].dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Seq Sequential number (1)
5 A1 --- n_Seq [+] + marks bipolar pairs
7- 12 F6.2 arcsec Xbr Coordinates of maximal Brightness, E (2)
14- 19 F6.2 arcsec Ybr Coordinates of maximal Brightness, N (2)
21- 26 F6.2 arcsec Xvel ?=- Coordinates of maximal Velocity, E (2)
28- 33 F6.2 arcsec Yvel ?=- Coordinates of maximal Velocity, N (2)
35- 36 I2 km/s Vlsr Velocity of the gas surrounding each feature
expressed as Vlsr
38- 40 I3 km/s VFlow ?=- Maximum velocity of the flow relative to
this local background velocity
42- 44 I3 ct Bmax Maximun brightness per 400s exposure
46- 48 I3 deg PA ? Position angle, measured east of north
49 A1 --- n_PA [n*-] Note on PA (3)
51- 53 F3.1 arcsec dmax ?=- Displacement in the plane of the sky
between the observed maxima in brightness
and velocity for each feature
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Note (1): Data are sorted by the east-coordinate of the maximum in brightness.
Objects identified as:
1-NN in field 1,
2-NN in field 2,
B-NN in field 3
Note (2): Position in the plane of the sky of the maxima in brightness and
velocity for each of the features. Positions are measured in
arcseconds east and north of the star
TCC0016 (05:35:14.91, -05:22:39.31 (J2000)).
Where no coordinates are given for a maximum in velocity, no
well-defined peak in the velocity was found nearby.
Note (3): Note on PA as follows:
- = the object is a weak radial velocity region (WRV)
n = indicates a displacement between maximum velocity and
brightness of <0.25".
* = flows where the morphology of the emission clearly indicates the
absolute direction of the flow. These are only found in tablea3.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Oct-2007