The Local Far-IR and HCN Correlation Two Nearby Spiral Disks

Details The Local Far-IR and HCN Correlation Two Nearby Spiral Disks The Local Far-IR and HCN Correlation Two Nearby Spiral Disks

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431102g&link_type=abstract

American Astronomical Society, AAS Meeting #214, #311.02; Bulletin of the American Astronomical Society, Vol. 41, p.746

Astronomy and Astrophysics

Astronomy

Scientific paper

From a survey of 65 galaxies, we have found a very strong linear relationship between HCN J=1-0 (tracer of dense molecular gas) and the far-IR luminosity for galaxies ranging over 3 orders of magnitude in LFIR (Gao & Solomon 2004). This leads to a global star formation law which shows that the star formation rate (SFR) deduced from the FIR is linearly proportional to the quantity of dense molecular gas traced by HCN emission. In addition, the global HCN/CO ratio is an excellent starburst indicator. Here we present the IRAM 30m HCN J=1-0 maps in the inner disks of two face-on spirals NGC 6946 and M51. {\it Spitzer} MIPS far-IR maps of comparable resolution are compared to the HCN emission. And the locally resolved FIR-HCN correlation is established or a local star formation law in terms of dense molecular gas across the inner disks of normal spiral galaxies.

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