ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – VIII. A search for hot cores by using C2H5CN, CH3OCHO, and CH3OH lines

Magnetic Fields in Massive Star Forming Regions

We present the largest sample of high-mass star-forming regions observed using submillimetre imaging polarimetry. The data were taken using SCUBA in conjunction with the polarimeter on the JCMT in Hawaii. In total, 16 star forming regions were observed, although some of these contain multiple cores. The polarimetry implies a variety of magnetic field morphologies, with some very ordered fields....

Observations of Infall in Star-forming Regions

A necklace of dense cores in the high-mass star forming region G35.20−0.74 N: ALMA observations⋆⋆⋆

Context. The formation process of high-mass stars (with masses >8 M ) is still poorly understood, and represents a challenge from both the theoretical and observational points of view. The advent of the Atacama Large Millimeter Array (ALMA) is expected to provide observational evidence to better constrain the theoretical scenarios. Aims. The present study aims at characterizing the high-mass st...

Studies of dense cores in regions of massive star formation

We report the results of a multitransitional study of four southern molecular clouds in the CS J = 2−1, J = 3−2, J = 5 − 4, J = 7 − 6; CO J = 1 − 0, J = 3 − 2; C34S J = 2 − 1 and C18O J = 1 − 0 lines observed with SEST and CSO telescopes. To analyze the obtained maps we applied a MEM deconvolution technique which improves the resolution significantly, if the signal-to-noise ratio is sufficientl...

Outflow and Accretion in Massive Star Forming Regions

In order to distinguish between the various components of massive star forming regions (i.e. infalling, outflowing and rotating gas structures) within our own Galaxy, we require high angular resolution observations which are sensitive to structures on all size scales. To this end, we present observations of the molecular and ionized gas towards massive star forming regions at 230 GHz from the S...