A Submillimeter Study of the Star-Forming Region NGC7129
Abstract
We present new molecular (13CO J=3-2 and C18O J=3-2) and dust continuum (450 and 850 micron) SCUBA observations of the NGC7129 star forming region. The maps include the Herbig Ae/Be star LkHa 234, the far-infrared source NGC 7129 FIRS2 and several other pre-stellar sources embedded within the molecular ridge. Both the continuum and 13CO emissions show a similar morphology, displaying a sharp boundary towards the cavity. A new protostar (SM2) is revealed in the continuum maps, not clearly seen in any earlier data set. Also, we are able to identify the highest peak emission with the deeply embedded source IRS6, a few arcseconds away from LkHa 234, and the most probable source for the molecular outflow near LkHa 234. We make fits to the spectral energy distributions to obtain the compact source sizes, the dust temperatures, luminosities, and masses. A map of the 850 micron/450 micron spectral index, alpha, shows a correlation between alpha minima and the continuum flux peaks. The dense compact sources have dust emissivity indices, beta, of 1 to 1.6, while beta is typically 2.0 in the surrounding cloud. The spectral index, alpha, increases steeply from the center of the molecular ridge, through the PDR, to the molecular cloud boundary. Although an increase in temperature will contribute to an increase in alpha, the observed values require a rising beta through the PDR.Keywords
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