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A Chain of Dark Clouds in Projection Against the Galactic Center
Takahiro Nagayama, Shuji Sato, Shogo Nishiyama +9
In the J, H, and Ks bands survey of the the Galactic Center region over an area of 2deg x 5deg, we have found many dark clouds, among which a distinguished chain of dark clouds can…
Magnetic Field Configuration at the Galactic Center Investigated by Wide Field Near-Infrared Polarimetry
Shogo Nishiyama, Motohide Tamura, Hirofumi Hatano +13
We present a polarimetric map of a 20'x20' area toward the Galactic center. The polarization of point sources has been measured in the J, H, and Ks bands using the near-infrared po…
Mapping dust column density in dark clouds by using NIR scattered light : Case of the Lupus 3 dark cloud
Yasushi Nakajima, Ryo Kandori, Motohide Tamura +3
We present a method of mapping dust column density in dark clouds by using near-infrared scattered light. Our observations of the Lupus 3 dark cloud indicate that there is a well d…
Sequential star formation in a cometary globule (BRC37) of IC1396
Hisashi Ikeda, Koji Sugitani, Makoto Watanabe +9
We have carried out near-IR/optical observations to examine star formation toward a bright-rimmed cometary globule (BRC37) facing the exciting star(s) of an HII region (IC1396) con…
Interstellar Extinction Law toward the Galactic Center II: V, J, H, and Ks Bands
Shogo Nishiyama, Tetsuya Nagata, Motohide Tamura +4
We have determined the ratios of total to selective extinction directly from observations in the optical V band and near-infrared J band toward the Galactic center. The OGLE (Optic…
Clustering of Emission-line Stars in the W5E HII region
Makoto Nakano, Koji Sugitani, Takahiro Niwa +2
We have made a new survey of emission-line stars in the W5E HII region to investigate the population of PMS stars near the OB stars by using the Wide Field Grism Spectrograph 2 (WF…
Near-Infrared Polarimetry of the Eagle Nebula (M16)
Koji Sugitani, Makoto Watanabe, Motohide Tamura +10
We carried out deep and wide (about 8' x 8') JHKs imaging polarimetry in the southern region of the Eagle Nebula (M16). The polarization intensity map reveals that two YSOs with ne…
Herbig Ae/Be Stars in the Magellanic Bridge
Shogo Nishiyama, Yasuaki Haba, Daisuke Kato +11
We have found Herbig Ae/Be star candidates in the western region of the Magellanic Bridge. Using the near infrared camera SIRIUS and the 1.4 m telescope IRSF, we surveyed about 3.0…
Near-Infrared Extinction in The Coalsack Globule 2
Takahiro Naoi, Motohide Tamura, Tetsuya Nagata +8
We have conducted J, H, and Ks imaging observations for the Coalsack Globule 2 with the SIRIUS infrared camera on the IRSF 1.4 m telescope at SAAO, and determined the color excess…
Probable association of T Tauri stars with the L1014 dense core
Atsuko Morita, Makoto Watanabe, Koji Sugitani +7
Using the Wide Field Grism Spectrograph 2 (WFGS2), we have carried out slit-less spectroscopy, g'r'i' photometry, and slit spectroscopy on the L1014 dense core. We detected three H…
The Distance to the Galactic Center Derived From Infrared Photometry of Bulge Red Clump Stars
Shogo Nishiyama, Tetsuya Nagata, Shuji Sato +7
On the basis of the near infrared observations of bulge red clump stars near the Galactic center, we have determined the galactocentric distance to be R_0 = 7.52 +- 0.10 (stat) +-…
Sequential Formation of Low-Mass Stars in the BRC 14 Region
Ikuko Matsuyanagi, Yoichi Itoh, Koji Sugitani +3
We have carried out a deep near-infrared survey of a bright-rimmed molecular cloud, BRC 14 (IC 1848A). The 10 sigma limiting magnitude of the survey is 17.7 mag at the K-band. Seve…
Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center
Shogo Nishiyama, Tetsuya Nagata, Nobuhiko Kusakabe +8
We have determined the ratios of total to selective extinction in the near-infrared bands (J, H, Ks) toward the Galactic center from the observations of the region |l| < 2.0deg and…
Near-Infrared Photometric Monitoring of a Pre-Main-Sequence Object KH 15D
Nobuhiko Kusakabe, Motohide Tamura, Yasushi Nakajima +12
An extensive photometric monitoring of KH 15D, an enigmatic variable in the young star cluster NGC 2264, has been conducted. Simultaneous and accurate near-infrared (JHKs-bands) ph…
A Distinct Structure Inside the Galactic Bar
Shogo Nishiyama, Tetsuya Nagata, Daisuke Baba +16
We present the result of a near-infrared (J H Ks) survey along the Galactic plane, -10.5deg < l < +10.5deg and b=+1.0deg, with the IRSF 1.4m telescope and the SIRIUS camera. Ks vs.…
A near-infrared study of the NGC 7538 star forming region
D. K. Ojha, M. Tamura, Y. Nakajima +11
We present sub-arcsecond (FWHM ~ 0".7), NIR JHKs-band images and a high sensitivity radio continuum image at 1280 MHz, using SIRIUS on UH 88-inch telescope and GMRT. The NIR survey…
Deep near-infrared observations of W3 Main star forming region
D. K. Ojha, M. Tamura, Y. Nakajima +8
We present a deep JHKs-band imaging survey of the W3 Main star forming region, using the near-infrared camera, SIRIUS, mounted on the University of Hawaii 2.2m telescope. The near-…
The Infrared Counterpart of the X-Ray Nova XTE J1720-318
Tetsuya Nagata, Daisuke Kato, Daisuke Baba +15
We report on the discovery of an infrared counterpart to the X-ray transient XTE J1720-318 on 2003 January 18, nine days after an X-ray outburst, and the infrared light curve durin…
Detection of Molecular Hydrogen Emission Associated with LkHalpha 264
Yoichi Itoh, Koji Sugitani, Katsuo Ogura +1
We have detected emission of molecular hydrogen from a classical T Tauri star, LkHalpha 264 in the v=1-0 S(1) line at 2.122 micron. The line velocity is coincident with the rest ve…
An Optical and Near Infrared Search for Brown Dwarfs in the Pleiades Cluster
C. Nagashima, P. D. Dobbie, T. Nagayama +9
We have carried out a brown dwarf search over an area of 14' x 23' near the central portion of the Pleiades open cluster in five optical and near infrared bands (i', Z, J, H, Ks) w…
Interferometric Observations of the T Tauri Stars in the MBM 12 Cloud
Yoichi Itoh, Koji Sugitani, Naoya Fukuda +7
We have carried out a millimeter interferometric continuum survey toward 7 YSOs in the MBM 12 cloud. Thermal emissions associated with 2 YSOs were detected above the 3- level at…
Evolution of Elliptical Galaxies at z >~ 1 Revealed from a Large, Multicolor Sample of Extremely Red Objects
M. Miyazaki, K. Shimasaku, T. Kodama +23
We study the evolution of elliptical galaxies at z >~ 1 on the basis of a sample of 247 Extremely Red Objects (EROs) with R-Ks >= 3.35 (AB) and Ks <= 22.1 (AB) constructed from BVR…