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        검색결과 3

        2.
        2005.12 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        We have searched for infrared emission from supernova remnants (SNRs) included in the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) field. At the positions of 100 known SNRs, we made 3.6, 4.5, 5.8, and $8.0 μm band images covering the radio continuum emitting area of each remnant. In-depth examinations of four band images based on the radio continuum images of SNRs result in the identification of sixteen infrared SNRs in the GLIMPSE field. Eight SNRs show distinct infrared emission in nearly all the four bands, and the other eight SNRs are visible in more than one band. We present four band images for all identified SNRs, and RGB-color images for the first eight SNRs. These images are the first high resolution (<2') images with comparative resolution of the radio continuum for SNRs detected in the mid-infrared region. The images typically show filamentary emission along the radio enhanced SNR boundaries. Most SNRs are well identified in the 4.5 and 5.8 μm bands. We give a brief description of the infrared features of the identified SNRs.
        7,000원
        3.
        2002.06 KCI 등재 SCOPUS 구독 인증기관 무료, 개인회원 유료
        We present the results of VLA NH3 (1,1) and (2,2) line observations of the young-stellar object (YSO) IRAS 19550+3248. The integrated intensity map of the NH3 (1,1) line shows that there are two ammonia cores in this region; core A which is associated with the YSO, and core B which is diffuse and located at the northeast of core A. Core A is compact and elongated along the east-west direction (0.07 pc×0.05 pc) roughly perpendicular to the molecular outflow axis. Core B is diffuse and extended (0.18 pc×0.07 pc). NH3 (2,2) line is detected only toward core A, which indicates that it is hotter (~ 15 K), presumably due to the heating by the YSO. The NH3 (1,1) line toward core A is wide (Δv ≳ 3 km s-l) and appears to have an anomalous intensity ratio of the inner satellite hyperfine lines. The large line width may be attributed to the embedded YSO, but the hyperfine anomaly is difficult to explain. We compare the results of NH3 observations with those of previous CS observations and find that the CS emission is detected only toward core A and is much more extended than the NH3 emission.
        4,000원