The CARMA 3mm survey of the inner 0.7° × 0.4° of the Central Molecular Zone

Marc W. Pound*, Farhad Yusef-Zadeh

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The Central Molecular Zone (CMZ) of the Galactic Centre has to date only been fully mapped at mm wavelengths with single-dish telescopes, with resolution about 30 arcsec (1.2 pc). Using Combined Array for Research in Millimeter-wave Astronomy (CARMA), we mapped the innermost 0.25 deg2 of the CMZ over the region between -0.2° ≤ l ≤ 0.5° and -0.2° ≤ b ≤ 0.2° (90 × 50 pc) with spatial and spectral resolution of ~10 arcsec (0.4 pc) and ~2.5 kms-1, respectively. We provide a catalogue of 3mm continuum sources and spectral line images of SiO(J=2-1), HCO+(J=1-0), HCN(J=1-0), N2H+(J=1-0) and CS(J=2-1), with velocity coverage VLSR = -200 to 200 km s-1. To recover the large-scale structure resolved out by the interferometer, the continuum-subtracted spectral line images were combined with data from theMopra 22-m telescope survey, thus providing maps containing all spatial frequencies down to the resolution limit. We find that integrated intensity ratio of I(HCN)/I(HCO+) is anticorrelated with the intensity of the 6.4 keV FeKα, which is excited either by highenergy photons or low-energy cosmic rays, and the gas velocity dispersion as traced by HCO+ is correlated with FeKα intensity. The intensity ratio and velocity dispersion patterns are consistent with variation expected from the interaction of low-energy cosmic rays with molecular gas.

Original languageEnglish (US)
Pages (from-to)2899-2929
Number of pages31
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number3
DOIs
StatePublished - Jan 2018

Keywords

  • Dust
  • Extinction
  • Galaxy: centre
  • ISM: clouds
  • Radio continuum: ISM
  • Radio lines: ISM
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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