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 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

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 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.

scholarly journals Near-infrared imaging of the star forming region S87

2003 ◽  
Vol 401 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Yuxi Chen ◽  
Xing-Wu Zheng ◽  
Yongqiang Yao ◽  
Ji Yang ◽  
Shuji Sato
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming

scholarly journals THE COSMOS-WIRCam NEAR-INFRARED IMAGING SURVEY. I.BzK-SELECTED PASSIVE AND STAR-FORMING GALAXY CANDIDATES ATz≳ 1.4

2009 ◽  
Vol 708 (1) ◽  
pp. 202-217 ◽  
Author(s):  
H. J. McCracken ◽  
P. Capak ◽  
M. Salvato ◽  
H. Aussel ◽  
D. Thompson ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming

Near-Infrared Imaging of the Star-forming Region AFGL 5157

1999 ◽  
Vol 117 (1) ◽  
pp. 446-455 ◽  
Author(s):  
Yafeng Chen ◽  
Yongqiang Yao ◽  
Ji Yang ◽  
Takanori Hirao ◽  
Miki Ishii ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming

scholarly journals Near-Infrared Imaging Polarimetry of the NGC 2071 Star-Forming Region with SIRPOL

2007 ◽  
Vol 59 (3) ◽  
pp. 467-479 ◽  
Author(s):  
Motohide Tamura ◽  
Ryo Kandori ◽  
Jun Hashimoto ◽  
Nobuhiko Kusakabe ◽  
Yasushi Nakajima ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Star Forming ◽  
Imaging Polarimetry

scholarly journals Preliminary status of POLICAN: A near-infrared imaging polarimeter

2014 ◽  
Vol 10 (S305) ◽  
pp. 175-180 ◽  
Author(s):  
R. Devaraj ◽  
A. Luna ◽  
L. Carrasco ◽  
Y. D. Mayya
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Infrared Camera ◽  
Stokes Parameters ◽  
Polarization Angle ◽  
Linear Combinations ◽  
Star Forming ◽  
Star Forming Regions ◽  
Instrumental Polarization ◽  
Sky Survey

AbstractPOLICAN is a near-infrared (J, H, K) imaging polarimeter developed for the Cananea near infrared camera (CANICA) at the 2.1m telescope of the Guillermo Haro Astrophysical Observatory (OAGH) located at Cananea, Sonora, México. The camera has a 1024 x 1024 HgCdTe detector (HAWAII array) with a plate scale of 0.32 arcsec/pixel providing a field of view of 5.5 x 5.5 arcmin. POLICAN is mounted externally to CANICA for narrow-field (f/12) linear polarimetric observations. It consists of a rotating super achromatic (1-2.7μm) half waveplate and a fixed wire-grid polarizer as the analyzer. The light is modulated by setting the half waveplate at different angles (0○, 22.5○, 45○, 67.5○) and linear combinations of the Stokes parameters (I, Q and U) are obtained. Image reduction and removal of instrumental polarization consist of dark noise subtraction, polarimetric flat fielding and background sky subtraction. Polarimetric calibration is performed by observing polarization standards available in the literature. The astrometry correction is performed by matching common stars with the Two Micron All Sky Survey. POLICAN's bright and limiting magnitudes are approximately 6th and 16th magnitude, which correspond to saturation and photon noise, respectively. POLICAN currently achieves a polarimetric accuracy about 3.0% and polarization angle uncertainties within 3○. Preliminary observations of star forming regions are being carried out in order to study their magnetic field properties.

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