The Dust Emissivity Spectral Index in the Starless Core TMC-1C

TL;DR

This study maps dust emission in the starless core TMC-1C across multiple wavelengths, analyzing the dust emissivity spectral index, temperature, and density, and finds it consistent with a standard value of beta = 2.

Contribution

It provides the first detailed multi-wavelength dust emission map of TMC-1C and demonstrates that the emissivity spectral index remains constant across the core.

Findings

Emissivity spectral index is close to beta=2.

Dust temperature at the core's peak is approximately 7 K.

Data are consistent with a constant spectral index across TMC-1C.

Abstract

In this paper we present a dust emission map of the starless core TMC-1C taken at 2100 microns. Along with maps at 160, 450, 850 and 1200 microns, we study the dust emissivity spectral index from the (sub)millimeter spectral energy distribution, and find that it is close to the typically assumed value of beta = 2. We also map the dust temperature and column density in TMC-1C, and find that at the position of the dust peak (A_V ~ 50), the line-of-sight-averaged temperature is ~7 K. Employing simple Monte Carlo modeling, we show that the data are consistent with a constant value for the emissivity spectral index over the whole map of TMC-1C.