CO Depletion in the Starless Cloud Core L1544

Details CO Depletion in the Starless Cloud Core L1544 CO Depletion in the Starless Cloud Core L1544

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523l.165c&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 2, pp. L165-L169.

Astronomy and Astrophysics

Astronomy

192

Ism: Dust, Extinction, Ism: Individual: Alphanumeric: L1544, Ism: Molecules

Scientific paper

We present evidence for CO depletion toward the starless cloud core L1544. A comparison between C^17O and the 1.3 mm continuum dust emission shows that CO is depleted by a factor of ~10 at the dust peak. Our observations are consistent with a model in which CO is condensed out onto dust grains at densities above n_d~10^5 cm^-3. The corresponding radius of the ``depleted region'' is r_d~6500 AU, and we find that this depletion causes 2.3 M_solar of gas to be lost to view in molecular line emission. Optically thin high-density tracers, such as HC^18O^+ and D^13CO^+, show double-peaked profiles which suggest that we are observing superposed emission from the foreground and background undepleted layers with density below n_d. We conclude from our data that the core is probably young (~10^4 yr old) and collapsing. For the component at V_LSR=7.1 km s^-1 in this line of sight, we estimate [DCO^+]/[HCO^+]=0.12+/-0.02, which is larger by a factor of order 2 than values derived in other dense cloud cores.

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