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J/A+A/613/A42      M-3.8+0.9 molecular cloud 3mm datacubes      (Riquelme+ 2018)

The footpoints of the giant molecular loops in the Galactic center region. Riquelme D., Amo-Baladron A., Martin-Pintado J., Mauersberger R., Martin S., Burton M., Cunningham M., Jones P., Menten K.M., Bronfman L., Guesten R. <Astron. Astrophys. 613, A42 (2018)> =2018A&A...613A..42R (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Molecular clouds Keywords: ISM: molecules - Galaxy: center - ISM: clouds Abstract: We aim to reveal the morphology, chemical composition, kinematics and to establish the main processes prevalent in the gas at the footpoints of the giant molecular loops (GMLs) in the Galactic center region. Using the 22-m Mopra telescope, we mapped the M-3.8+0.9 molecular cloud, placed at the footpoints of a giant molecular loop, in 3-mm range molecular lines. To derive the molecular hydrogen column density, we also observed the 13CO (2-1) line at 1mm using the 12-m APEX telescope. From the 3 mm observations 12 molecular species were detected, namely HCO+, HCN, H13CN, HNC, SiO, CS, CH3OH, N2H+, SO, HNCO, OCS, and HC3N. Maps revealing the morphology and kinematics of the M-3.8+0.9 molecular cloud in different molecules are presented. We identify six main molecular complexes. We derive fractional abundances in 11 selected positions of the different molecules assuming local thermodynamical equilibrium. Most of the fractional abundances derived for the M-3.8+0.9 molecular cloud are very similar over the whole cloud. However, the fractional abundances of some molecules show significant difference with respect to those measured in the central molecular zone (CMZ). The abundances of the shock tracer SiO are very similar between the GMLs and the CMZ. The methanol emission is the most abundant species in the GMLs. This indicates that the gas is likely affected by moderate ∼30km/s or even high velocity (50km/s) shocks, consistent with the line profile observed toward one of the studied position. The origin of the shocks is likely related to the flow of the gas throughout the GMLs towards the footpoints. Description: We mapped the M-3.8+0.9 molecular cloud placed at the footpoints of a giant molecular loop, in 3-mm range molecular lines using Mopra telescope, and the 13CO (2-1) line at 1 mm using the 12-m Atacama Pathfinder EXperiment (APEX) telescope. The Mopra observations were performed during September 2008 and August 2009. We used the digital mode filter bank MOPS in broadband mode, covering 8GHz of bandwidth simultaneously in four 2.2GHz sub-bands, each of them with 8192 channel spaced by 0.27MHz. Two polarizations were measured simultaneously. We produce one data cube per detected molecule. The final spatial resolution of the data cubes is between 49 arcsec and 51 arcsec at 115 and 86GHz respectively. The size of the pixel is 15 arcsec. The spectral resolution of the data is 269.5kHz (0.94-0.78km/s). The data is presented in T*a (K). The APEX observations were carried out on 24 June, and 1, 2, and 3 July 2014 under the APEX project code M-093.F-008-2014 using the APEX-1 (SHIFI) receiver and the eXtended bandwidth Fast Fourier Transform Spectrometer (XFFTS) backend. The data were regridded in equatorial coordinates and then converted to Galactic coordinates for comparison with the Mopra data using standard CLASS routines. The pixel size is 13.8 arcsec. The spatial resolution is 30.1 arcsec and the spectral resolution is 299.8kHz (1.03km/s). The data is presented in Tmb (K). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 17 32 54 -31 43 21 M-3.8+0.9 = [RBM2010] M-3.8+0.9 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 106 14 List of the available data cubes fits/* 0 14 Individual data cubes
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Name of the source 12- 18 F7.3 deg GLong Galactic Longitude 20- 24 F5.3 deg GLat Galactic Latitude 27- 33 F7.3 GHz RestFreq Rest Frequency 35- 37 I3 --- Nx Number of pixels along X-axis 39- 41 I3 --- Ny Number of pixels along Y-axis 43- 46 I4 --- Nz Number of slices 49- 55 A7 K Scale Intensity Scale 57- 80 A24 --- Title Title of the FITS file 82-106 A25 --- FileName Name of FITS file, in subdirectory fits
Acknowledgements: Denise Riquelme, riquelme(at)
(End) Patricia Vannier [CDS] 26-Jan-2018
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