Structure and Composition of Molecular Clouds with CN Zeeman Detections: DR21(OH)

Details Structure and Composition of Molecular Clouds with CN Zeeman Detections: DR21(OH) Structure and Composition of Molecular Clouds with CN Zeeman Detections: DR21(OH)

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mwac.meet..p07h&link_type=abstract

Midwest Astrochemistry Meeting 2011, held 21-22 October at the University of Illinois at Urbana-Champaign. http://midwest.astroc

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out a multi-species study of a region which has had previous measurements of strong magnetic fields through the CN Zeeman effect in order to explore the relationship between CN and N2H+, both of which have evidence that they remain in the gas phase at densities of 105 - 106 cm-3. To achieve this, we mapped the 2 arcmin region around DR21(OH) using the Combined Array for Millimeter-wave Astronomy (CARMA). Approximately 37 hours of data were collected in multiple array configurations to produce high signal-to-noise maps with an effective resolution of ~5" for N2H+, HCN, and HCO+, and ~3" for CN and C18O. Several bands of continuum data were obtained with varying effective resolutions. These data have allowed us to compare tracer molecules associated with both low- and high-density regions to infer gas properties. We determined that CARMA resolves out 50% of the CN emission around DR21(OH) when compared with spectra obtained from the IRAM 30-m telescope. In addition, we have detected a previously unseen compact feature in HCO+ which could be a maser; its position is coincident with a known methanol maser. These data have determined that future high-resolution interferometric CN Zeeman measurements which cannot currently be performed (due to technical limitations of telescopes) are feasible. We additionally have confirmed that CN is indeed a good tracer for high-density regions.

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