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Near- to Far-Infrared Spectral Energy Distribution Analysis of Interacting Galaxies in Hickson Compact Groups 56 and Stephan's Quintet (HCG 92)
Ayato Ikeuchi, Itsuki Sakon, Takashi Onaka +2
We investigate star formation activity in galaxies belonging to two Hickson Compact Groups (HCGs), HCG 56 and HCG 92 (Stephan's Quintet), both of which show clear evidence of inter…
Searching for missing interstellar oxygen in the far-infrared
Takashi Onaka, Itsuki Sakon, Takashi Shimonishi +1
Study of interstellar elemental depletion poses an important problem in the interstellar matter that at least a quarter of the total oxygen ( ppm relative to hydrogen) is…
ALMA Observations of Peculiar Embedded Icy Objects
Takashi Shimonishi, Takashi Onaka, Itsuki Sakon
We report the results of molecular line observations with the Atacama Large Millimeter/submillimeter Array (ALMA) towards two peculiar icy objects, which were discovered serendipit…
Investigating C-D out-of-plane vibrational modes in PAHs as a tool to study interstellar deuterium-containing PAHs
Mridusmita Buragohain, Takashi Onaka, Amit Pathak +2
Previous as well as recent observations by ISO, Spitzer, AKARI, SOFIA, JWST etc. have revealed various characteristics of mid-infrared emission bands between 3-20 micron. Subsequen…
Near-infrared spectroscopy of a massive young stellar object in the direction toward the Galactic Center: XCN and aromatic C-D features
Takashi Onaka, Itsuki Sakon, Takashi Shimonishi
We report near-infrared (2.5--5 micron) long-slit (~ 30 arcsec) spectroscopy of a young stellar object in the direction toward the Galactic center with the Infrared Camera on board…
Laboratory measurements of stretching band strengths of deuterated Quenched Carbonaceous Composites (D-QCC)
Tamami Mori, Takashi Onaka, Itsuki Sakon +4
The observed large variation in the abundance of deuterium (D) in the interstellar medium (ISM) suggests that a significant fraction of D may be depleted into polycyclic aromatic h…