J/A+A/579/A130 Near-IR BN/KL outflow images (Bally+, 2015)
The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar
outflow.
Bally J., Ginsburg A., Silvia D., Youngblood A.
<Astron. Astrophys. 579, A130 (2015)>
=2015A&A...579A.130B 2015A&A...579A.130B
ADC_Keywords: Molecular clouds ; Interstellar medium ; Infrared sources
Keywords: ISM: jets and outflows - ISM: clouds - stars: formation
Abstract:
Adaptive optics images are used to test the hypothesis that the
explosive BN/KL outflow from the Orion OMC1 cloud core was powered by
the dynamical decay of a non-hierarchical system of massive stars.
Narrow-band H2, [FeII], and broad-band Ks obtained with the Gemini
South multi-conjugate adaptive optics (AO) system GeMS and
near-infrared imager GSAOI are presented. The images reach resolutions
of 0.08 to 0.10" to the 0.07" diffraction limit of the 8-meter
telescope at 2.12um. Comparison with previous AO-assisted observations
of sub-fields and other ground-based observations enable measurements
of proper motions and the investigation of morphological changes in
H2 and [FeII] features with unprecedented precision. The images are
compared with numerical simulations of compact, high-density clumps
moving ∼103 times their own diameter through a lower density medium
at Mach 103.
Description:
The Gemini Multi-conjugate adaptive optics System (GeMS) at the Gemini
South telescope on Cerro Pachon is the first and only sodium-based
multi-laser guide star (LGS) adaptive optics system.
GeMS works with a LGS constellation of 5-spots: 4 of the LGS spots are
at the corners of a 60" square, with the 5-th positioned in the
center. The Adaptive Optics (AO) bench called Canopus is mounted on
one of the f/16 Cassegrain ports. Gemini South Adaptive Optics Imager
(GSAOI) is a wide-field 4096 by 4096 pixel (85" by 85" field of view)
camera designed to work at the diffraction limit of the 8- meter
telescope in the near-infrared. Three 85" diameter fields were
observed in OMC1 between 30 December 2012 and 28 February 2013 using
GSAOI. Observations of each field were obtained through 1% bandpass
narrow-band filters centered on the 1.644um [FeII] and 2.122um H2
emission lines and the broad-band Ks filter. The corrected images have
FWHM diameters of 0.080" to 0.10", providing the highest angular
resolution images of the BN/KL outflow ever obtained in the near-IR.
Objects:
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RA (2000) DE Designation(s)
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05 35 14.16 -05 22 21.5 BN/KL = Name Orion KL
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 112 3 List of FITS images
fits/* . 3 Individual FITS images
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See also:
J/AJ/120/1426 : Chandra sources in ONC + BN-KL (Garmire+, 2000)
J/ApJS/156/127 : 350µm molecular line survey of Orion KL (Comito+, 2005)
J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011)
J/A+A/559/A51 : HC3N in Orion KL (Esplugues+, 2013)
J/ApJ/769/48 : Water maser in Orion-KL with Herschel (Neufeld+, 2013)
J/A+A/572/A44 : Vibrationally excited vinyl cyanide in Orion-KL (Lopez+, 2014)
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- 25 F6.4 arcsec/pix Scale [0.0198] Scale of the image
27- 30 I4 --- Nx [8750] Number of pixels along X-axis
32- 36 I5 --- Ny [11250] Number of pixels along Y-axis
38- 43 I6 Kibyte size [384528] Size of FITS file
45- 64 A20 --- FileName Name of FITS file in subdirectory fits
66-112 A47 --- Title Title of the file
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Acknowledgements:
Adam Ginsburg, adam.g.ginsburg (at)gmail.com
(End) Patricia Vannier [CDS] 11-Feb-2015