The Kinetic Temperature Structure within NGC 2024

Details The Kinetic Temperature Structure within NGC 2024 The Kinetic Temperature Structure within NGC 2024

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...526..845m&link_type=abstract

The Astrophysical Journal, Volume 526, Issue 2, pp. 845-853.

Astronomy and Astrophysics

Astronomy

15

Ism: Individual (Ngc 2024), Ism: Molecules, Stars: Pre-Main-Sequence

Scientific paper

An ideal molecular probe for tracing the kinetic temperature in dense molecular cloud cores should allow the temperature determination to be independent of gas density effects. The formaldehyde (H2CO) molecule, a slightly asymmetrical rotor, is just such a molecule. By using several sets of judiciously chosen H2CO line ratios, we have reliably determined the gas kinetic temperatures of the dense gas condensations within the NGC 2024 star formation region. Our measurements indicate TK>40 K toward the embedded sources FIR3-FIR7. These sources, which had previously been identified as isothermal protostars, are likely in a more evolved state.

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