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ATLASGAL --- Environments of 6.7,GHz methanol masers | | J. S. Urquhart
; T. J. T. Moore
; F. Schuller
; F. Wyrowski
; K. M. Menten
; M. A. Thompson
; T. Csengeri
; C. M. Walmsley
; L. Bronfman
; C. König
; | | Date: |
11 Feb 2013 | | Abstract: | Using the 870-$mu$m APEX Telescope Large Area Survey of the Galaxy
(ATLASGAL), we have identified 577 submillimetre continuum sources with masers
from the methanol multibeam (MMB) survey in the region $280degr < ell <
20degr$; $|,b,| < 1.5degr$. 94,per,cent of methanol masers in the region
are associated with sub-millimetre dust emission. We estimate masses for ~450
maser-associated sources and find that methanol masers are preferentially
associated with massive clumps. These clumps are centrally condensed, with
envelope structures that appear to be scale-free, the mean maser position being
offset from the peak column density by 0.0 pm 4". Assuming a Kroupa initial
mass function and a star-formation efficiency of ~30,per,cent, we find that
over two thirds of the clumps are likely to form clusters with masses
>20,msun. Furthermore, almost all clumps satisfy the empirical mass-size
criterion for massive star formation. Bolometric luminosities taken from the
literature for ~100 clumps range between ~100 and 10$^6$,lsun. This confirms
the link between methanol masers and massive young stars for 90,per,cent of
our sample. The Galactic distribution of sources suggests that the
star-formation efficiency is significantly reduced in the Galactic-centre
region, compared to the rest of the survey area, where it is broadly constant,
and shows a significant drop in the massive star-formation rate density in the
outer Galaxy. We find no enhancement in source counts towards the southern
Scutum-Centaurus arm tangent at $ell ~ 315degr$, which suggests that this arm
is not actively forming stars. | | Source: | arXiv, 1302.2538 | | Services: | Forum | Review | PDF | Favorites | |
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