J/A+A/496/153 Molecular hydrogen flows along Ori A cloud (Davis+, 2009)
A census of molecular hydrogen outflows and their sources along the Orion A
molecular ridge. Characteristics and overall distribution.
Davis C.J., Froebrich D., Stanke T., Megeath S.T., Kumar M.S.N.,
Adamson A., Eisloeffel J., Gredel R., Khanzadyan T., Lucas P., Smith M.D.,
Varricatt W.P.
<Astron. Astrophys., 496, 153-176 (2009)>
=2009A&A...496..153D 2009A&A...496..153D
ADC_Keywords: Molecular clouds ; Millimetric/submm sources
Keywords: stars: formation - stars: winds, outflows - ISM: Herbig-Haro objects -
ISM: jets and outflows - infrared: ISM - shock waves
Abstract:
A census of molecular hydrogen flows across the entire Orion A giant
molecular cloud is sought. With this paper we aim to associate each
flow with its progenitor and associated molecular core, so that the
characteristics of the outflows and outflow sources can be
established.
We present wide-field near-infrared images of Orion A, obtained
with the Wide Field Camera, WFCAM, on the United Kingdom Infrared
Telescope. Broad-band K and narrow-band H2 1-0S(1) images of a
contiguous ∼8 square degree region are compared to mid-IR photometry
from the Spitzer Space Telescope and (sub)millimetre dust-continuum
maps obtained with the MAMBO and SCUBA bolometer arrays. Using
previously-published H2 images, we also measured proper motions for
H2 features in 33 outflows, and use these data to help associate
flows with existing sources and/or dust cores.
Description:
Broad-band J, H, K and narrow-band H2 2.122um images of a
1.5°x1.5° field centred on M 42/M 43 were obtained during
instrument commissioning on 24 November 2004.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 134 73 H2 jets and outflows in Orion A, from the catalogue
of Stanke et al., 2002, Cat. J/A+A/392/239
table3.dat 133 43 New H2 jets in Orion A (additions to the catalogue
of Stanke et al., 2002, Cat. J/A+A/392/239)
tableb1.dat 76 147 Proper motions of H2 features
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See also:
J/A+A/392/239 : IR survey of outflows in Orion A (Stanke+, 2002)
J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007)
Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SMZ Sequential number
4 A1 --- --- [/]
5- 7 I3 --- SMZ2 ? Second SMZ number when association
9 I1 h RAh Right ascension (J2000) (1)
11- 12 I2 min RAm Right ascension (J2000) (1)
14- 17 F4.1 s RAs Right ascension (J2000) (1)
19 A1 --- DE- Declination sign (J2000) (1)
20 I1 deg DEd Declination (J2000) (1)
22- 23 I2 arcmin DEm Declination (J2000) (1)
25- 26 I2 arcsec DEs Declination (J2000) (1)
27 A1 --- n_DEs [)] ) if position of the brightest knot in
the flow (1)
29- 39 A11 --- Outflow Outflow source name (2)
41- 45 F5.2 --- alpha ? Spectral index of Outflow (2)
47- 61 A15 --- N850 850um dust core coincident with the
H2 outflow source (3)
64- 65 I2 arcsec a850 ? Major axis of the core size at 850um (3)
66 A1 --- --- [x]
67- 68 I2 arcsec b850 ? Minor axis of the core size at 850um (3)
70- 73 F4.1 Jy I850 ? Integrated flux at 850um (3)
75- 78 F4.2 Jy F850 ? Flux at 850um (in Jy/beam) (3)
80- 90 A11 --- N1200 1200um dust core coincident with the
H2 outflow source (4)
91- 93 I3 arcsec a1200 ? Major axis of the core size at 1200um (4)
94 A1 --- --- [x]
95- 96 I2 arcsec b1200 ? Minor axis of the core size at 1200um (4)
98-100 I3 deg O1200 ? Orientation of the core major axis
102-105 F4.2 Jy I1200 ? Integrated flux at 1200um (4)
107-110 F4.2 Jy F1200 ? Flux at 1200um (in Jy/beam) (4)
112 A1 --- l_L [~>] Limit flag on L
113-117 F5.2 arcmin L ? Entire length (5)
119-120 I2 deg theta ? Opening angle measured from a cone centred
on the outflow source that includes all
H2 features in the flow
122 A1 --- l_PA [~] Limit flag on PA
123-125 I3 deg PA ? Position angle measured east of north
127-134 A8 --- HH Associated HH objects, if any are known
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Note (1): Position of the H2 outflow source if one is listed in "Outflow"
column. Otherwise, the position of the brightest knot in the flow is
given (bracket). Note that the well-known sources of the HH 1/2, HH 83
and V380-Ori-NE flows were not identified in our tables of Spitzer
protostars or disc-excess sources.
Note (2): Most likely H2 outflow source from the Spitzer photometry
together with the spectral index, α. Just a question mark means
there is no obvious H2 flow source candidate.
Note (3): 850um dust core coincident with the H2 outflow source (from
Nutter & Ward-Thompson, 2007, Cat. J/MNRAS/374/1413). The source must
lie within a 14" radius (the JCMT beam at 850um) of the core position
given by Nutter & Ward-Thompson in their Table A.1. "Emission" or
"undetected" means that no core appears in their table. However,
"emission" means that the source identified in Col. "Outflow" is
associated with diffuse 850um emission (surface brightness
>100mJy/beam, which is roughly equivalent to 5σ); a question
mark means there are cores (or emission) in the vicinity which could
be associated with the outflow or its source; "no obs" means that the
outflow is outside the bounds of the SCUBA map. The flux is measured
towards each IRS source (not necessarily the peak flux of the
associated core).
Note (4): Same as for the 850um cores, but for cores identified from our
analysis of the 1200 observations of Stanke et al. (in prep.). In this
case the source must lie within 11" of the core centroid; "emission"
corresponds to a surface brightness >75mJy/beam-1 (∼5σ).
Note (5): Entire length of all H2 knots (in both lobes), or the distance
from the source to the most distant H2 knot if only one flow lobe is
identified
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SMZ Sequential number
4 A1 --- --- [/]
5- 7 I3 --- SMZ2 ? Second SMZ number when association
8 A1 -- n_SMZ2 [*] Note (1)
11- 17 A7 --- Knot Knot designation
20 I1 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 28 F4.1 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31 I1 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 37 I2 arcsec DEs Declination (J2000)
39- 44 F6.3 pix shift-x Shift along x axis
46- 51 F6.3 pix shift-y Shift along y axis
53- 56 F4.2 pix shiftpix Total shift in pixel
58- 61 F4.2 arcsec shift Total shift in arcsec
63- 67 F5.1 km/s Vel Tangential velocity (2)
69- 74 F6.1 deg Position Angle of the PM vector, measured E of N
76 I1 --- Flag Status Flag. Those with value 2 are uncertain
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Note (1): In these objects clusters of knots are labelled A, B, etc., with
the individual knots themselves labelled A1, A2, etc. and B1, B2, etc.
The PM of 5-23 G, for example, is for all knots G1-G5 measured together.
Note (2): A nominal error of 21km/s has been adopted (see text for details).
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History:
* 08-Apr-2011: From electronic version of the journal
* 23-Apr-2019: units of L corrected into arcmin
(End) Patricia Vannier [CDS] 04-Mar-2011