21 research outputs found
WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects
We systematically investigate the mid-infrared (MIR; m) time
variability of uniformly selected massive young stellar objects
(MYSOs) from the Red MSX Source (RMS) survey. Out of the 806 sources, we obtain
reliable 9-year-long MIR magnitude variability data of 331 sources at the
3.4~m (W1) and 4.6~m (W2) bands by cross-matching the MYSO positions
with ALLWISE and NEOWISE catalogs. After applying the variability selections
using ALLWISE data, we identify 5 MIR-variable candidates. The light curves
show various classes, with the periodic, plateau-like, and dipper features. Out
of the obtained two color-magnitude diagram of W1 and W1W2, one shows "bluer
when brighter and redder when fainter" trends in variability, suggesting change
in extinction or accretion rate. Finally, our results show that
G335.996000.8532 (hereafter, G335) has a periodic light curve, with a
-day cycle. Spectral energy density model fitting results indicate
that G335 is a relatively evolved MYSO; thus, we may be witnessing the very
early stages of a hyper- or ultra-compact HII region, a key source for
understanding MYSO evolution.Comment: 12 pages, 5 figures, 3 tables. Accepted by Ap
中間赤外線を用いた大質量星形成の研究
学位の種別: 課程博士審査委員会委員 : (主査)東京大学准教授 小林 尚人, 東京大学教授 川邊 良平, 東京大学教授 小林 行泰, 東京大学准教授 田中 培生, 国立天文台准教授 中村 文隆University of Tokyo(東京大学
The infrared imaging spectrograph (IRIS) for TMT: status report for IRIS imager
The current status of IRIS imager at NAOJ is reported. IRIS (Infrared Imaging Spectrograph) is a first light instrument of TMT (Thirty Meter Telescope). IRIS has just passed the preliminary design review and moved forward to the final design phase. In this paper, optical and mechanical design of IRIS imager and prototyping activities conducted during the preliminary design phase are summarized
Labeling of alprenolol with fluorescent aryl iodide as a reagent based on Mizoroki-Heck coupling reaction.
A novel fluorescent labeling method for alprenolol was developed based on Mizoroki-Heck coupling reaction. We designed and synthesized fluorescent aryl iodide, 4-(4,5-diphenyl-1H-imidazol-2-yl)iodobenzene (DIBI) as a labeling reagent. DIBI has a lophine skeleton carrying an iodide atom acting as fluorophore and reactive center, respectively. In order to evaluate the usefulness of DIBI, a high-performance liquid chromatography (HPLC) with fluorescence detection method was developed for the determination of alprenolol as a model compound of terminal double bond. The fluorescent labeling of alprenolol with DIBI was achieved in the presence of palladium acetate as a catalyst, and the labeled alprenolol was detected fluorometrically. In addition, it was found that the fluorescence of DIBI derivative increased and red shifted when compared with that of DIBI. Furthermore, the proposed method could be applied to determine the alprenolol concentration in rat plasma after administration of alprenolol without interferences from biological components. The detection limit (S/N=3) for alprenolol in rat plasma was 0.74 ng/mL (30 fmol on column)
The infrared imaging spectrograph (IRIS) for TMT: status report for IRIS imager
The current status of IRIS imager at NAOJ is reported. IRIS (Infrared Imaging Spectrograph) is a first light instrument of TMT (Thirty Meter Telescope). IRIS has just passed the preliminary design review and moved forward to the final design phase. In this paper, optical and mechanical design of IRIS imager and prototyping activities conducted during the preliminary design phase are summarized