Observations of Massive Star‐Forming Regions with Water Masers: Mid‐Infrared Imaging

2005 ◽  
Vol 156 (2) ◽  
pp. 179-215 ◽  
Author(s):  
J. M. De Buizer ◽  
J. T. Radomski ◽  
C. M. Telesco ◽  
R. K. Pina
Keyword(s):  
Massive Star ◽  
Infrared Imaging ◽  
Mid Infrared ◽  
Star Forming ◽  
Star Forming Regions ◽  
Water Masers

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

High‐Resolution Mid‐Infrared Imaging and Spectroscopic Observations of a Massive Star Forming Region W51 IRS 2

2001 ◽  
Vol 553 (1) ◽  
pp. 254-266 ◽  
Author(s):  
Yoshiko K. Okamoto ◽  
Hirokazu Kataza ◽  
Takuya Yamashita ◽  
Takashi Miyata ◽  
Takashi Onaka
Keyword(s):  
High Resolution ◽  
Massive Star ◽  
Infrared Imaging ◽  
Mid Infrared ◽  
Star Forming ◽  
Spectroscopic Observations

scholarly journals 325 GHz Water Masers in Orion Source I

2012 ◽  
Vol 8 (S287) ◽  
pp. 184-185
Author(s):  
Florian Niederhofer ◽  
Elizabeth Humphreys ◽  
Ciriaco Goddi ◽  
Lincoln J. Greenhill
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
High Mass ◽  
Mass Star ◽  
Compact Disk ◽  
Volume Source ◽  
Star Forming ◽  
Star Forming Regions ◽  
Water Masers ◽  
Excitation Conditions

AbstractRadio Source I in the Orion BN/KL region provides the closest example of high mass star formation. It powers a rich ensemble of SiO and H2O masers, and is one of only three star-forming regions known to display SiO maser emission. Previous monitoring of different SiO masers with the VLBA and VLA has enabled the resolution of a compact disk and a protostellar wind at radii <100 AU from Source I, which collimates into a bipolar outflow at radii of 100-1000 AU (see contribution by Greenhill et al., this volume). Source I may provide the best case of disk-mediated accretion and outflow recollimation in massive star formation. Here, we report preliminary results of sub-arcsecond resolution 325 GHz H2O maser observations made with the SMA. We find that 325 GHz H2O masers trace a more collimated portion of the Source I outflow than masers at 22 GHz, but occur at similar radii suggesting similar excitation conditions. A velocity gradient perpendicular to the outflow axis, indicating rotation, supports magneto-centrifugal driving of the flow.

scholarly journals Effects of infall and outflow on massive star-forming regions

2019 ◽  
Vol 488 (4) ◽  
pp. 4638-4647 ◽  
Author(s):  
Qiang Li ◽  
Jianjun Zhou ◽  
Jarken Esimbek ◽  
Yuxin He ◽  
Willem Baan ◽  
...  
Keyword(s):  
Detection Rate ◽  
Massive Star ◽  
Local Environment ◽  
Intimate Relationship ◽  
High Mass ◽  
Evolutionary Time ◽  
Star Forming ◽  
Star Forming Regions ◽  
Methanol Masers ◽  
Water Masers

ABSTRACT A total of 188 high-mass outflows have been identified from a sample of 694 clumps from the Millimetre Astronomy Legacy Team 90 GHz survey, representing a detection rate of approximately 27 per cent. The detection rate of outflows increases from the proto-stellar stage to the H ii stage, but decreases again at the photodissociation (PDR) stage suggesting that outflows are being switched off during the PDR stage. An intimate relationship is found between outflow action and the presence of masers, and water masers appear together with 6.7 GHz methanol masers. Comparing the infall detection rate of clumps with and without outflows, we find that outflow candidates have a lower infall detection rate. Finally, we find that outflow action has some influence on the local environment and the clump itself, and this influence decreases with increasing evolutionary time as the outflow action ceases.

scholarly journals Magnetic field structures in star-forming regions: mid-infrared imaging polarimetry of K3-50

2015 ◽  
Vol 453 (3) ◽  
pp. 2623-2637 ◽  
Author(s):  
Peter Barnes ◽  
Dan Li ◽  
Charles Telesco ◽  
Nahathai Tanakul ◽  
Naibí Mariñas ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Infrared Imaging ◽  
Mid Infrared ◽  
Star Forming ◽  
Star Forming Regions ◽  
Imaging Polarimetry

scholarly journals A QUALITY CHECK OF THE AKARI MID-INFRARED ALL-SKY DIFFUSE MAP TOWARD THE MASSIVE STAR-FORMING REGIONS NGC 6334 AND NGC 6357

2017 ◽  
Vol 32 (1) ◽  
pp. 21-23
Author(s):  
Hidetoshi Sano ◽  
Tomoya Amatsutsu ◽  
Toru Kondo ◽  
Keichiro Nakamichi ◽  
Mitsuyoshi Yamagishi ◽  
...  
Keyword(s):  
Massive Star ◽  
Mid Infrared ◽  
Star Forming ◽  
Star Forming Regions ◽  
Quality Check ◽  
Ngc 6334

scholarly journals FOUR HIGHLY LUMINOUS MASSIVE STAR-FORMING REGIONS IN THE NORMA SPIRAL ARM. II. DEEP NEAR-INFRARED IMAGING

2010 ◽  
Vol 710 (1) ◽  
pp. 583-596 ◽  
Author(s):  
L. Chavarría ◽  
D. Mardones ◽  
G. Garay ◽  
A. Escala ◽  
L. Bronfman ◽  
...  
Keyword(s):  
Massive Star ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming ◽  
Star Forming Regions ◽  
Spiral Arm

Mid‐Infrared Imaging of Star‐forming Regions Containing Methanol Masers

2000 ◽  
Vol 130 (2) ◽  
pp. 437-461 ◽  
Author(s):  
James M. De Buizer ◽  
Robert K. Pina ◽  
Charles M. Telesco
Keyword(s):  
Infrared Imaging ◽  
Mid Infrared ◽  
Star Forming ◽  
Star Forming Regions ◽  
Methanol Masers

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.

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