scholarly journals A Multiwavelength Study of Young Massive Star Forming Regions. II. The Dust Environment

2007 ◽  
Vol 666 (1) ◽  
pp. 309-320 ◽  
Author(s):  
Guido Garay ◽  
Diego Mardones ◽  
Kate J. Brooks ◽  
Liza Videla ◽  
Yanett Contreras
Keyword(s):  
Massive Star ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals The Circumstellar Environment of Embedded Massive Stars

2002 ◽  
Vol 12 ◽  
pp. 143-145 ◽  
Author(s):  
Lee G. Mundy ◽  
Friedrich Wyrowski ◽  
Sarah Watt
Keyword(s):  
Massive Star ◽  
Massive Stars ◽  
Low Mass Stars ◽  
Submillimeter Wavelength ◽  
Star Forming ◽  
Star Forming Regions ◽  
Low Mass ◽  
Circumstellar Environments ◽  
Near Future

Millimeter and submillimeter wavelength images of massive star-forming regions are uncovering the natal material distribution and revealing the complexities of their circumstellar environments on size scales from parsecs to 100’s of AU. Progress in these areas has been slower than for low-mass stars because massive stars are more distant, and because they are gregarious siblings with different evolutionary stages that can co-exist even within a core. Nevertheless, observational goals for the near future include the characterization of an early evolutionary sequence for massive stars, determination if the accretion process and formation sequence for massive stars is similar to that of low-mass stars, and understanding of the role of triggering events in massive star formation.

scholarly journals Millimetre wavelength methanol masers survey towards massive star forming regions

2007 ◽  
Vol 3 (S242) ◽  
pp. 234-235
Author(s):  
T. Umemoto ◽  
N. Mochizuki ◽  
K. M. Shibata ◽  
D.-G. Roh ◽  
H.-S. Chung
Keyword(s):  
Detection Rate ◽  
Massive Star ◽  
Molecular Line ◽  
Maser Emission ◽  
Star Forming ◽  
Methanol Maser ◽  
Physical Conditions ◽  
Star Forming Regions ◽  
Methanol Masers ◽  
Maser Sources

AbstractWe present the results of a mm wavelength methanol maser survey towards massive star forming regions. We have carried out Class II methanol maser observations at 86.6 GHz, 86.9 GHz and 107.0 GHz, simultaneously, using the Nobeyama 45 m telescope. We selected 108 6.7 GHz methanol maser sources with declinations above −25 degrees and fluxes above 20 Jy. The detection limit of maser observations was ~3 Jy. Of the 93 sources surveyed so far, we detected methanol emission in 25 sources (27%) and “maser” emission in nine sources (10%), of which thre “maser” sources are new detections. The detection rate for maser emission is about half that of a survey of the southern sky (Caswell et al. 2000). There is a correlation between the maser flux of 107 GHz and 6.7 GHz/12 GHz emission, but no correlation with the “thermal” (non maser) emission. From results of other molecular line observations, we found that the sources with methanol emission show higher gas temperatures and twice the detection rate of SiO emission. This may suggest that dust evaporation and destruction by shock are responsible for the high abundance of methanol molecules, one of the required physical conditions for maser emission.

scholarly journals Infall and outflow motions towards a sample of massive star-forming regions from the RMS survey

2018 ◽  
Vol 477 (2) ◽  
pp. 2455-2469 ◽  
Author(s):  
N Cunningham ◽  
S L Lumsden ◽  
T J T Moore ◽  
L T Maud ◽  
I Mendigutía
Keyword(s):  
Massive Star ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals Water in massive star-forming regions: HIFI observations of W3 IRS5

2010 ◽  
Vol 521 ◽  
pp. L37 ◽  
Author(s):  
L. Chavarría ◽  
F. Herpin ◽  
T. Jacq ◽  
J. Braine ◽  
S. Bontemps ◽  
...  
Keyword(s):  
Massive Star ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. V. G23.01–0.41 AND G23.44–0.18

2009 ◽  
Vol 693 (1) ◽  
pp. 424-429 ◽  
Author(s):  
A. Brunthaler ◽  
M. J. Reid ◽  
K. M. Menten ◽  
X. W. Zheng ◽  
L. Moscadelli ◽  
...  
Keyword(s):  
Massive Star ◽  
Star Forming ◽  
Star Forming Regions ◽  
Trigonometric Parallaxes

scholarly journals A MULTIWAVELENGTH STUDY OF YOUNG MASSIVE STAR-FORMING REGIONS. III. MID-INFRARED EMISSION

2009 ◽  
Vol 698 (1) ◽  
pp. 488-501 ◽  
Author(s):  
Esteban F. E. Morales ◽  
Diego Mardones ◽  
Guido Garay ◽  
Kate J. Brooks ◽  
Jaime E. Pineda
Keyword(s):  
Massive Star ◽  
Infrared Emission ◽  
Mid Infrared ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals IDENTIFYING YOUNG STARS IN MASSIVE STAR-FORMING REGIONS FOR THE MYStIX PROJECT

2013 ◽  
Vol 209 (2) ◽  
pp. 32 ◽  
Author(s):  
Patrick S. Broos ◽  
Konstantin V. Getman ◽  
Matthew S. Povich ◽  
Eric D. Feigelson ◽  
Leisa K. Townsley ◽  
...  
Keyword(s):  
Massive Star ◽  
Young Stars ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals IONIZED GAS TOWARD MOLECULAR CLUMPS: PHYSICAL PROPERTIES OF MASSIVE STAR-FORMING REGIONS

2009 ◽  
Vol 707 (1) ◽  
pp. 283-309 ◽  
Author(s):  
Katharine G. Johnston ◽  
Debra S. Shepherd ◽  
James E. Aguirre ◽  
Miranda K. Dunham ◽  
Erik Rosolowsky ◽  
...  
Keyword(s):  
Physical Properties ◽  
Massive Star ◽  
Ionized Gas ◽  
Star Forming ◽  
Star Forming Regions

Gravity as main driver of non-thermal motions in massive star forming regions

2015 ◽  
Vol 75-76 ◽  
pp. 185-188 ◽  
Author(s):  
A. Traficante ◽  
G.A. Fuller ◽  
R. Smith ◽  
N. Billot ◽  
A. Duarte-Cabral ◽  
...  
Keyword(s):  
Massive Star ◽  
Star Forming ◽  
Star Forming Regions ◽  
Main Driver

scholarly journals ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – I. Survey description and a first look at G9.62+0.19

2020 ◽  
Vol 496 (3) ◽  
pp. 2790-2820 ◽  
Author(s):  
Tie Liu ◽  
Neal J Evans ◽  
Kee-Tae Kim ◽  
Paul F Goldsmith ◽  
Sheng-Yuan Liu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Star Formation ◽  
Survey Data ◽  
Massive Star ◽  
High Mass ◽  
Dense Gas ◽  
Star Forming ◽  
Star Forming Regions ◽  
Stellar Feedback ◽  
Dense Cores

ABSTRACT The ATOMS, standing for ALMA Three-millimeter Observations of Massive Star-forming regions, survey has observed 146 active star-forming regions with ALMA band 3, aiming to systematically investigate the spatial distribution of various dense gas tracers in a large sample of Galactic massive clumps, to study the roles of stellar feedback in star formation, and to characterize filamentary structures inside massive clumps. In this work, the observations, data analysis, and example science of the ATOMS survey are presented, using a case study for the G9.62+0.19 complex. Toward this source, some transitions, commonly assumed to trace dense gas, including CS J = 2−1, HCO+J = 1−0, and HCN J = 1−0, are found to show extended gas emission in low-density regions within the clump; less than 25 per cent of their emission is from dense cores. SO, CH3OH, H13CN, and HC3N show similar morphologies in their spatial distributions and reveal well the dense cores. Widespread narrow SiO emission is present (over ∼1 pc), which may be caused by slow shocks from large–scale colliding flows or H ii regions. Stellar feedback from an expanding H ii region has greatly reshaped the natal clump, significantly changed the spatial distribution of gas, and may also account for the sequential high-mass star formation in the G9.62+0.19 complex. The ATOMS survey data can be jointly analysed with other survey data, e.g. MALT90, Orion B, EMPIRE, ALMA_IMF, and ALMAGAL, to deepen our understandings of ‘dense gas’ star formation scaling relations and massive protocluster formation.

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