Survey of intermediate/high-mass star-forming regions at centimeter and millimeter wavelengths
arXiv:0802.3132 · doi:10.1051/0004-6361:20078406
Abstract
We present the results of millimeter and centimeter continuum observations, made with the IRAM 30m telescope and the VLA, toward a sample of 11 luminous IRAS sources classified as high-mass protostellar object candidates. We find 1.2 mm emission for all (but one) regions likely tracing the dust core in which the massive young stellar object is forming, for which we estimate masses ranging from 10 to 140 Msun. For all the sources, but one, we detect centimeter emission associated with the IRAS source, being compact or ultracompact HII region candidates, with early B-type stars as ionizing stars. The 7 mm emission is partially resolved for the four sources observed at this wavelength, with contribution of dust emission at 7 mm ranging from negligible to 44%. By combining our data with infrared surveys we fitted the spectral energy distribution of the sources. Finally, we find a correlation between the degree of disruption of the natal cloud, estimated from the fraction of dust emission associtaed with the centimeter source relative to the total amount of dust in its surroundings, and the size of the centimeter source. From this correlation, we establish an evolutionary sequence which is consistent with the evolutionary stage expected from maser/outflow/dense gas emission and with the infrared excess.
20 pages, 12 figures, accepted for publication in A&A
References in corpus (14)
- The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
- Infall of gas as the formation mechanism of stars up to 20 times more massive than the Sun
- X-ray Study of Triggered Star Formation and Protostars in IC 1396N
- The Early Evolution of Massive Stars: Radio Recombination Line Spectra
- Multi-wavelength observations of Southern Hot Molecular Cores traced by methanol masers - I. Ammonia and 24 GHz Continuum Data
- Water maser variability over 20 years in a large sample of star-forming regions: the complete database
- Forming an Early O-type Star Through Gas Accretion?
- A Survey of OH Masers Towards High Mass Protostellar Objects
- A high-frequency radio continuum study of massive young stellar objects
- Investigating high-mass star formation through maser surveys
- Spitzer-IRAC GLIMPSE of high mass protostellar objects. I Infrared point sources and nebulae
- Occurrence Frequency of CO Outflows in Massive Protostellar Candidates
- SCUBA Mapping of Outer Galaxy Protostellar Candidates
- Profiling Young Massive Stars