Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines

Details Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines

2011-10-07

arxiv.org/abs/1110.1421v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

27 pages, 15 figures, 12 tables, accepted by MNRAS

Scientific paper

We have mapped 20 molecular lines in the Central Molecular Zone (CMZ) around the Galactic Centre, emitting from 85.3 to 93.3 GHz. This work used the 22-m Mopra radio telescope in Australia, equipped with the 8-GHz bandwidth UNSW-MOPS digital filter bank, obtaining \sim 2 km/s spectral and \sim 40 arcsec spatial resolution. The lines measured include emission from the c-C3H2, CH3CCH, HOCO+, SO, H13CN, H13CO+, SO, H13NC, C2H, HNCO, HCN, HCO+, HNC, HC3N, 13CS and N2H+ molecules. The area covered is Galactic longitude -0.7 to 1.8 deg. and latitude -0.3 to 0.2 deg., including the bright dust cores around Sgr A, Sgr B2, Sgr C and G1.6-0.025. We present images from this study and conduct a principal component analysis on the integrated emission from the brightest 8 lines. This is dominated by the first component, showing that the large-scale distribution of all molecules are very similar. We examine the line ratios and optical depths in selected apertures around the bright dust cores, as well as for the complete mapped region of the CMZ. We highlight the behaviour of the bright HCN, HNC and HCO+ line emission, together with that from the 13C isotopologues of these species, and compare the behaviour with that found in extra-galactic sources where the emission is unresolved spatially. We also find that the isotopologue line ratios (e.g. HCO+/H13CO+) rise significantly with increasing red-shifted velocity in some locations. Line luminosities are also calculated and compared to that of CO, as well as to line luminosities determined for external galaxies.

Affiliated with

Also associated with

No associations

Rating

Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-132400