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

NEAR-INFRARED IMAGING OF THE STAR-FORMING REGIONS SH2-157 AND SH2-152

2009 ◽  
Vol 693 (1) ◽  
pp. 430-446 ◽  
Author(s):  
Yafeng Chen ◽  
Yongqiang Yao ◽  
Ji Yang ◽  
Qin Zeng ◽  
Shuji Sato
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming ◽  
Star Forming Regions

scholarly journals Near-infrared imaging observations of the southern massive star-forming region G333.6−0.2

2005 ◽  
Vol 356 (3) ◽  
pp. 801-809 ◽  
Author(s):  
Takuya Fujiyoshi ◽  
Craig H. Smith ◽  
Toby J. T. Moore ◽  
Stuart L. Lumsden ◽  
David K. Aitken ◽  
...  
Keyword(s):  
Massive Star ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming

scholarly journals The Nuclear Ring in the Barred Spiral Galaxy IC 4933

2010 ◽  
Vol 27 (1) ◽  
pp. 56-63 ◽  
Author(s):  
Stuart D. Ryder ◽  
Samuel M. Illingworth ◽  
Robert G. Sharp ◽  
Catherine L. Farage
Keyword(s):  
Spiral Galaxy ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Star Formation History ◽  
Star Forming ◽  
Star Forming Regions ◽  
The North ◽  
Contact Points ◽  
Nuclear Ring ◽  
Barred Spiral Galaxy

AbstractWe present infrared imaging from IRIS2 on the Anglo–Australian Telescope that shows the barred spiral galaxy IC 4933 has not just an inner ring encircling the bar, but also a star-forming nuclear ring 1.5 kpc in diameter. Imaging in the u′ band with GMOS on Gemini South confirms that this ring is not purely an artifact due to dust. Optical and near-infrared colours alone however cannot break the degeneracy between age, extinction, and burst duration that would allow the star formation history of the ring to be unraveled. Integral field spectroscopy with the GNIRS spectrograph on Gemini South shows the equivalent width of the Paβ line to peak in the north and south quadrants of the ring, indicative of a bipolar azimuthal age gradient around the ring. The youngest star-forming regions do not appear to correspond to where we expect to find the contact points between the offset dust lanes and the nuclear ring unless the nuclear ring is oval in shape, causing the contact points to lead the bar by more than 90°.

Magnetic field structures in star-forming regions revealed by imaging polarimetry at multi-wavelengths

2018 ◽  
Vol 14 (A30) ◽  
pp. 102-102
Author(s):  
Jungmi Kwon
Keyword(s):  
Magnetic Fields ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Young Stellar Objects ◽  
High Mass ◽  
Mass Star ◽  
Stellar Objects ◽  
Star Forming ◽  
Star Forming Regions ◽  
Imaging Polarimetry

AbstractMagnetic fields are ubiquitous in various scales of astronomical objects, and they are considered as playing significant roles from star to galaxy formations. However, the role of the magnetic fields in star forming regions is less well understood because conventional optical polarimetry is hampered by heavy extinction by dust. We have been conducting extensive near-infrared polarization survey of various star-forming regions from low- and intermediate-mass to high-mass star-forming regions, using IRSF/SIRPOL in South Africa. Not only linear but also circular polarizations have been measured for more than a dozen of regions. Both linear and circular polarimetric observations at near-infrared wavelengths are useful tools to study the magnetic fields in star forming regions, although infrared circular polarimetry has been less explored so far. In this presentation, we summarize our results of the near-infrared polarization survey of star forming regions and its comparison with recent submillimeter polarimetry results. Such multi-wavelength approaches can be extended to the polarimetry using ALMA, SPICA in future, and others. We also present our recent results of the first near-infrared imaging polarimetry of young stellar objects in the Circinus molecular cloud, which has been less studied but a very intriguing cluster containing numerous signs of active low-mass star formation.

scholarly journals Magnetic fields in massive star forming regions: wide-field NIR polarimetry of M42 and Mon R2

2008 ◽  
Vol 4 (S259) ◽  
pp. 97-98 ◽  
Author(s):  
Nobuhiko Kusakabe ◽  
Motohide Tamura ◽  
Ryo Kandori ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Massive Star ◽  
Near Infrared ◽  
Polarized Light ◽  
Field Structure ◽  
Wide Field ◽  
Magnetic Field Structure ◽  
Star Forming ◽  
Star Forming Regions

AbstractMagnetic fields are believed to play an important role in star formation. We observed M42 and Mon R2 massive star forming regions using the wide-field (8′ × 8′) near-infrared imaging polarimeter SIRPOL in South Africa. Magnetic fields are mapped on the basis of dichroic polarized light from hundreds of young stars embedded in the regions. We found “hourglass shaped” magnetic field structure toward OMC-1 region, which is very consistent with magnetic fields traced by using dust emission polarimetry at sub-mm to FIR wavelengths. In the Mon R2 region, we found “S-shaped” magnetic field structure across the massive protostar IRS 1 and IRS 2. We will present the results of comparison of magnetic fields at NIR with those at other wavelengths.

scholarly journals FOUR HIGHLY LUMINOUS MASSIVE STAR-FORMING REGIONS IN THE NORMA SPIRAL ARM. I. MOLECULAR GAS AND DUST OBSERVATIONS

2010 ◽  
Vol 710 (1) ◽  
pp. 567-582 ◽  
Author(s):  
Guido Garay ◽  
Diego Mardones ◽  
Leonardo Bronfman ◽  
Jorge May ◽  
Luis Chavarría ◽  
...  
Keyword(s):  
Massive Star ◽  
Molecular Gas ◽  
Star Forming ◽  
Star Forming Regions ◽  
Spiral Arm

scholarly journals Photometric and spectroscopic studies of very low mass YSOs and young Brown Dwarfs in S106

2006 ◽  
Vol 2 (S237) ◽  
pp. 457-457
Author(s):  
Yumiko Oasa
Keyword(s):  
Massive Star ◽  
Near Infrared ◽  
Brown Dwarfs ◽  
Spectroscopic Studies ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Hii Region ◽  
Star Forming ◽  
Star Forming Regions ◽  
Low Mass

Young brown dwarfs have been identified in a significant population in various star forming regions. Some deep surveys have yielded less massive objects with planetary-mass (e.g., Oasa et al. 1999; Lucas & Roche 2000). Nevertheless, it is not yet clear how abundant these very low-mass objects are formed. S106 is one of the nearest massive star-forming regions associated with prominent bipolar nebulae and an HII region. We have conducted near-infrared photometric and spectroscopic observations of very low-mass young stellar objects (YSOs) in the S106 region.

scholarly journals Near-Infrared Imaging of the LMC Nebula N11B

2002 ◽  
Vol 207 ◽  
pp. 199-201
Author(s):  
Rodolfo H. Barbá ◽  
Monica Rubio
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Infrared Observations ◽  
Star Forming ◽  
Methanol Maser ◽  
Ir Sources

We present new near-infrared observations of the N11B nebula in the LMC. The presence of IR sources with intrinsic IR excess, a methanol maser and a very prominent PDR regions suggest strong star forming activity in N11B.

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