Interaction between the H ii region and AFGL 333-Ridge: Implications for the star formation scenario

Publications of the Astronomical Society of Japan

Burns, Ross A.²  Chibueze, James O.⁴  Sunada, Kazuyoshi³  Nagayama, Takumi³  Handa, Toshihiro⁵  Nakano, Makoto¹  Omodaka, Toshihiro⁵  Kamezaki, Tatsuya⁵  Soejima, Takashi¹ 

[1] Faculty of Education, Oita University, 700 Dannoharu, Oita, Oita 870-1192, Japan;Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, JapanJoint Institute for VLBI ERIC (JIVE), Postbus 2, 7990 AA Dwingeloo, the Netherlands;Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Department of Physics and Astronomy, Faculty of Physical Sciences, University of Nigeria, Carver Building, 1 University Road, Nsukka, Nigeria;Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan

关键词: "H ii regions";    "ISM: clouds";    "ISM: individual (AFGL 333)";    "stars: formation";   

DOI  :  10.1093/pasj/psw120

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WeinvestigatedthestarformationactivitiesintheAFGL 333region,whichisinthevicinityoftheW 4expandingbubble,byconductingNH3(1,1),(2,2),and(3,3)mappingobservationswiththe45mNobeyamaRadioTelescopeanangularresolutionof75″.ThemorphologyoftheNH3(1,1)mapshowsabow-shapedstructurewiththesizeof2.0×0.6 pcasseeninthedustcontinuum.AttheinterfacebetweentheW 4bubbleandthedenseNH3cloud,thecompactH iiregionG134.2+0.8,associatedwithIRAS 02245+6115,islocated.Interestingly,justatthenorthandsouthofG134.2+0.8wefoundNH3emissionexhibitinglargevelocitywidthsof∼2.8 km s−1,comparedto1.8 km s−1attheotherpositions.Asthepossibilityofmechanicalenergyinjectionthroughtheactivityofyoungstellarobjects(YSOs)islow,weconsideredtheoriginofthelargeturbulentgasmotionasanindicationofinteractionbetweenthecompactH iiregionandtheperipheryofthedensemolecularcloud.WealsofoundexpandingmotionoftheCOemissionassociatedwithG134.2+0.8.TheoverallstructureoftheAFGL 333-RidgemighthavebeenformedbytheexpandingbubbleofW 4.However,thesmallvelocitywidthsobservedtothewestofIRAS 02245+6115,aroundthecenterofthedensemolecularcloud,suggestthatinteractionwiththecompactH iiregionislimited.ThereforetheYSOs(dominantlyClass0/I)inthecoreoftheAFGL 333-Ridgedensemolecularcloudmostlikelyformedinquiescentmode.Aspreviouslysuggestedforthelarge-scalestarformationintheW 3giantmolecularcloud,ourresultsshowanapparentcoexistenceofinducedandquiescentstarformationsinthisregion.ItappearsthatstarformationintheAFGL 333regionhasproceededwithoutsignificantexternaltriggers,butaccompanyingstellarfeedbackenvironment.

【 授权许可】

Unknown