Is the filamentary dark cloud GF 6 a star forming region? — Stability analysis and infrared properties

Jaeheon Kim, Hyun-Goo Kim, Sang Joon Kim, Bo Zhang

Abstract


We present the results of mapping observations and stability analyses toward the filamentary dark cloud GF 6. We investigate the internal structures of a typical filamentary dark cloud GF 6 to know whether the filamentary dark cloud will form stars. We perform radio observations with both 12CO (J=1–0) and 13CO (J=1–0) emission lines to examine the mass distribution and its evolutionary status. The 13CO gas column density map shows eight subclumps in the GF 6 region with sizes on a sub-pc scale. The resulting local thermodynamic equilibrium masses of all the subclumps are too low to form stars against the turbulent dissipation. We also investigate the properties of embedded infrared point sources to know whether they are newly formed stars. The infrared properties also indicate that these point sources are not related to star forming activities associated with GF 6. Both radio and infrared properties indicate that the filamentary dark cloud GF 6 is too light to contract gravitationally and will eventually be dissipated away.


Keywords


ISM: clouds — ISM: molecules — radio lines: ISM — infrared: ISM — Instabilities — Turbulence

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DOI: http://dx.doi.org/10.1088/1674%E2%80%934527%2F17%2F12%2F126

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Print ISSN: 1674-4527

Online ISSN: 2397-6209