Investigating the Limits of Chemical Complexity in Sagittarius B2(N): A Rigorous Attempt to Confirm 1,3-Dihydroxyacetone

Details Investigating the Limits of Chemical Complexity in Sagittarius B2(N): A Rigorous Attempt to Confirm 1,3-Dihydroxyacetone Investigating the Limits of Chemical Complexity in Sagittarius B2(N): A Rigorous Attempt to Confirm 1,3-Dihydroxyacetone

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...643l..29a&link_type=abstract

The Astrophysical Journal, Volume 643, Issue 1, pp. L29-L32.

Biology

9

Astrobiology, Astrochemistry, Ism: Abundances, Ism: Individual: Name: Sagittarius B2, Ism: Molecules

Scientific paper

A search for confirming transitions of 1,3-dihydroxyacetone, (CH2OH)2CO (hereafter DHA), has been made toward Sgr B2(N) using the Arizona Radio Observatory Submillimeter Telescope (SMT) and 12 m telescope at millimeter wavelengths. In addition, data for this species have been obtained at the Green Bank Telescope. In all, 63 new transitions of DHA were sought; no plausible emission was detected at 97% of these frequencies. Typical peak-to-peak limits of 10-30 mK were achieved, indicating that DHA is not present in Sgr B2(N) at the level reported by Widicus Weaver & Blake in 2005, by at least a factor of 300. The upper limit to the DHA column density is Ntot<5×1013 cm-2, suggesting that this species, a three-carbon keto sugar, is less abundant than the two-carbon aldehyde sugar, glycolaldehyde (CH2OHCHO), by a factor of at least 4. If sugars of higher complexity are formed in interstellar clouds, their synthesis may proceed one carbon atom at a time, possibly through aldehyde intermediates.

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