High Resolution Imaging of Three Starless Cores Using N2H+

Details High Resolution Imaging of Three Starless Cores Using N2H+ High Resolution Imaging of Three Starless Cores Using N2H+

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.9809g&link_type=abstract

American Astronomical Society Meeting 205, #98.09; Bulletin of the American Astronomical Society, Vol. 36, p.1506

Astronomy and Astrophysics

Astronomy

Scientific paper

Pre-protostellar cores are dense, cold regions in molecular cloud complexes, but do not show signs of an internal source of luminosity. It is thought that pre-protostellar cores represent the evolutionary stage just prior to low-mass star formation. Diazenylium (N2H+) provides an excellent density tracer for late stage pre-protostellar cores because it is resistant to depletion, and its hyperfine structure can yield useful information about optical depths. We present high resolution BEARS maps of the N2H+ 1-0 hyperfine transition for three pre-protostellar cores, Lynds 1498, Lynds 1512, and Lynds 1544.
A more detailed analysis of the L1498 N2H+ 1-0 hyperfine line ratios indicates that this transition is optically thick over much of the map. The peak column density of L1498 was found to be (8.3 ±3.4) X 1012 cm-2 after optical depth correction. N2H+ abundance in L1498 is fairly constant to a radius of 15,000 AU. The width of the N2H+ 1-0 lines in L1498 are also constant to the maximum radii sampled in these observations.
In addition, we present CSO observations of the N2H+ 3-2 transition. The N2H+ 3-2 transition was detected in L1512 and L1544, the more centrally condensed cores. This work was supported by a NSF-REU site grant to Associated Universities, Inc./National Radio Astronomy Observatory.

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