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Fundamental Parameters of the Milky Way Galaxy Based on VLBI astrometry
Mareki Honma, Takumi Nagayama, Kazuma Ando +31
We present analyses to determine the fundamental parameters of the Galaxy based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, VLBA and EVN. We model the Galax…
Tentative Detection of Deuterated Methane toward the Low-Mass Protostar IRAS 04368+2557 in L1527
Nami Sakai, Yancy L. Shirley, Takeshi Sakai +3
The millimeter-wave rotational transition line () of deuterated methane CHD has tentatively been detected toward the low-mass Class 0 protostar IRAS 04368+2557…
The first detection of the 232 GHz vibrationally excited H2O maser in Orion KL with ALMA
Tomoya Hirota, Mi Kyoung Kim, Mareki Honma
We investigated the ALMA science verification data of Orion KL and found a spectral signature of the vibrationally excited H2O maser line at 232.68670 GHz (nu2=1, 5,5,0-6,4,3). Thi…
A Highly collimated Water Maser Bipolar Outflow in the Cepheus A HW3d Massive Young Stellar Object
James O. Chibueze, Hiroshi Imai, Daniel Tafoya +5
We present the results of multi-epoch very long baseline interferometry (VLBI) water (H2O) maser observations carried out with the VLBI Exploration of Radio Astrometry (VERA) towar…
DNC/HNC Ratio of Massive Clumps in Early Evolutionary Stages of High-Mass Star Formation
Takeshi Sakai, Nami Sakai, Kenji Furuya +3
We have observed the HN13C J=1-0 and DNC J=1-0 lines toward 18 massive clumps, including infrared dark clouds (IRDCs) and high-mass protostellar objects (HMPOs), by using the Nobey…