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J/A+A/606/A126     Orion Source I 3mm SiO maser emission       (Issaoun+, 2017)

VLBA imaging of the 3mm SiO maser emission in the disk-wind from the massive protostellar system Orion Source I. Issaoun S., Goddi C., Matthews L.D., Greenhill L.J., Gray M.D., Humphreys E.M.L., Chandler C.J., Krumholz M., Falcke H. <Astron. Astrophys. 606, A126 (2017)> =2017A&A...606A.126I (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Masers Keywords: ISM: individual objects: Orion BN/KL (except planetary nebulae) - ISM: jets and outflows - radio lines: stars - stars: formation - masers Abstract: High-mass star formation remains poorly understood due to observational difficulties (e.g. high dust extinction and large distances) hindering the resolution of disk-accretion and out ow-launching regions. Orion Source I is the closest known massive young stellar object (YSO) and exceptionally powers vibrationally excited SiO masers at radii within 100AU, providing a unique probe of gas dynamics and energetics. We seek to observe and image these masers with Very Long Baseline Interferometry (VLBI). We present the first images of the 28SiO v=1, J=2-1 maser emission around Orion Source I observed at (λ2mm) with the Very Long Baseline Array (VLBA). These images have high spatial (∼0.3mas) and spectral (∼0.054km/s) resolutions. Description: Reduced spectral cube of the SiO v=1, J=2-1 maser transition near Orion Source I observed on Jan 24, 2011, in FITS format (with velocity as primary axis). VLBA project code BG205. Objects: ------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------- 05 35 14.16 -05 22 21.5 Orion BN/KL = NAME Orion BN/KL 05 35 14.5149 -05 22 30.582 Orion Source I ------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 171 1 Informations on fits file fits/* 0 1 Data cube (194G)
Description of file: from AIPS header of -------------------------------------------------------------------------------- Image=BNKL-I (MA) Filename=CUBE .TRANS . 1 Telescope=VLBA Receiver=VLBA Observer=BG205A User #= 100 Observ. date=24-JAN-2011 Map date=18-OCT-2016 Minimum=-5.60130215E+00 Maximum= 5.83315964E+01 JY/BEAM ---------------------------------------------------------------- Type Pixels Coord value at Pixel Coord incr Rotat VELO-LSR 775 3.3254643E+04 -98.00 -5.4321068E+01 0.00 RA---SIN 8192 05 35 14.515 4096.00 -0.000050 0.00 DEC--SIN 8192 -05 22 30.582 6097.00 0.000050 0.00 STOKES 1 1.0000000E+00 1.00 1.0000000E+00 0.00 ---------------------------------------------------------------- Coordinate equinox 2000.00 Map type=NORMAL Number of iterations= 9 Conv size= 0.00055 X 0.00019 Position angle= 0.00 Phase shifted in X 0.00000 in Y -0.10000 Rest freq 86243.423 Vel type: RADIO wrt LSR Alt ref. value 8.62248E+10 wrt pixel 1.00 Maximum version number of extension files of type HI is 1 Maximum version number of extension files of type CC is 775 Maximum version number of extension files of type CG is 1 Maximum version number of extension files of type CG is 1 Maximum version number of extension files of type SL is 1 Maximum version number of extension files of type PL is 1 Keyword = 'WTNOISE ' value = 1.26000635D+00 Keyword = 'SUMWTIN ' value = 9.07234946D-03 Keyword = 'CCFLUX ' value = 0.000000E+00 Keyword = 'CCTOTAL ' value = 0.000000E+00 Keyword = 'OLDRFQ ' value = 8.61973300D+10 Keyword = 'CORRELAT' value = 'DIFX ' Keyword = 'SOURNAM1' value = ' ' Keyword = 'SOURNAM2' value = ' ' Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 22 I3 --- Nx Number of pixels along X-axis 24- 27 I4 --- Ny Number of pixels along Y-axis 29- 32 I4 --- Nz Number of pixels along Z-axis 34- 43 A10 "date" Observation date 45- 52 F8.1 m/s bVELO-LSR Lower value of VELO-LSR interval 54- 60 F7.1 m/s BVELO-LSR Upper value of VELO-LSR interval 62- 68 F7.4 m/s dVELO-LSR VELO-LSR resolution 70- 78 I9 Kibyte size Size of FITS file 80- 90 A11 --- FileName Name of FITS file, in subdirectory fits 92-171 A80 --- Title Title of the FITS file
Acknowledgements: Sara Issaoun, sissaoun(at)
(End) Sara Issaoun [Radboud University], Patricia Vannier [CDS] 31-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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