Decomposition of the Superwind in M 82

Publications of the Astronomical Society of Japan

Kashikawa, Nobunari³  Taguchi, Hiroko¹  Aoki, Kentaro⁷  Okita, Kiichi⁵  Shimizu, Yasuhiro⁶  Saito, Yoshihiko³  Yadoumaru, Yasushi⁹  Takata, Tadafumi⁵  Sasaki, Toshiyuki⁵  Ozawa, Tomohiko⁹  Ohyama, Youichi⁵  Kawabata, Koji S.³  Sekiguchi, Kazuhiro⁵  Ebizuka, Noboru²  Asai, Ryo^4,8  Taniguchi, Yoshiaki⁴  Iye, Masanori¹⁰  Kosugi, George⁵  Yoshida, Michitoshi⁶  Inata, Motoko³ 

[1] Department of Astronomy and Earth Sciences, Tokyo Gakugei University, 4-1-1 Nukui-Kitamachi, Koganei, Tokyo 184-8501;Cosmic Radiation Laboratory, Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588;Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578;Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A’ohoku Place, Hilo, HI 96720, U.S.A.;Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Kamogata-cho, Asakuchi-gun, Okayama 719-0232;Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-1015;Systems Engineering Consultants Co., Ltd., Shibuya-ku, Tokyo 150-0031;Misato Observatory, 180 Matsugamine, Misato-cho, Amakusa-gun, Wakayama 640-1366;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588Department of Astronomy, Graduate University for Advanced Studies, 2-21-1, Osawa, Mitaka, Tokyo 181-8588

关键词: "galaxies: individual (M 82)";    "intergalactic medium";    "galaxies: starburst";    medium;    "shock waves";   

DOI  :  10.1093/pasj/54.6.891

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Wepresentnewopticalimages($$B,V$$,and$$mathrm{H}alpha$$)ofthearchetypicalstarburst/superwindgalaxyM82obtainedwiththe8.2 mSubaruTelescopetorevealnewdetailedstructuresofthesuperwind-drivennebulaandthehigh-latitudedarklanes.Theemission-linenebulaisdecomposedinto(1)aridge-dominatedcomponentcomprisingnumerousfilament/loopsub-structureswhoseoverallmorphologyappearsasapairofnarrowcylinders,and(2)adiffusecomponentextendedovermuchwideropeninganglefromthenucleus.Wesuggestthatthesetwocomponentshavedifferentorigins.Theridge-dominatedcomponentappearsasapairofcylindersratherthanapairofcones.SincethismorphologicalpropertyissimilartothatofhotplasmaprobedbysoftX-ray,thiscomponentseemstosurroundthehotplasma.Ontheotherhand,thediffusecomponentmayarisefromdustgrainswhichscatterstellarlightfromthegalaxy.Sinceinnerregionofthiscomponentisseenovertheprominent“X”-shapeddarklanesstreamingoutfromthenuclearregionandtheycanbereproducedasaconicaldistributionofdustgrains,thereseemstobeadustycoldoutflowaswellasthehotoneprobedbysoftX-rayandshock-excitedopticalemissionlines.Ifthisisthecase,thepresenceofsuchhigh-latitudedustgrainsimpliesthatneutralgaseousmatterisalsoblownoutduringthecourseofthesuperwindactivity.

【 授权许可】

Unknown