Publications of the Astronomical Society of Japan | |
CII Diffuse Emission Observed by IRTS | |
Nakagawa, Takao3  Matsuhara, Hideo1  Makiuti, Sin'itirou3  Hiromoto, Norihisa2  Okuda, Haruyuki3  Okumura, Ken'ichi2  Shibai, Hiroshi3  | |
[1] Department of Physics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01;Communications Research Laboratory, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184;The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229 E-mail (HS): | |
关键词: "Galaxies: Milky Way"; "Interstellar: clouds"; "Interstellar: medium"; "Infrared: spectra"; Spacecraft; | |
DOI : 10.1093/pasj/48.6.L127 | |
学科分类:天文学(综合) | |
来源: Oxford University Press | |
【 摘 要 】
TheCII158μmlineemissionandthefar-infraredcontinuumemissionat155μmwereobservedbytheFar-InfraredLineMapper(FILM)aboardtheInfraredTelescopeinSpace(IRTS)withitshighsensitivityandresolution.Theobservationwasmadealongagreatcirclecrossingthegalacticplaneatl=50°and230°.Twocomponentswerefoundintheirintensitydistributions.Thefirstcomponentconcentratesonthegalacticplane.Itisprominentontheplaneatl=50°,butisveryfaintat230°.Thesecondcomponentextendsoveratleast20°ingalacticlatitude,andhasnearlythesameintensityatbothcrossingpartsofthegalacticplane.Therefore,thefirstonecanbeascribedtoemissionfromthegalacticdisk,andthesecondcomponenttoemissionfromthelocalinterstellargas.Theintensitydistributionofthe[CII]lineofthesecondcomponentissimilartothatoftheHI21cmintegratedintensity.Thisfactsuggeststhatthelocal[CII]emissioncomponentarisesintheHI21cmlineemittinggas.FromtheratiooftheCIIlineluminositytothehydrogencolumndensity,theinterstellarcoolingrateoftheHIgasis(5.6±2.6)×10−27ergs−1/H-atom,correspondingtothecoldneutralgaswhosepressureisafewhundredcm−3K.
【 授权许可】
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