Atlas and Catalog of Dark Clouds Based on the 2 Micron All Sky Survey

Publications of the Astronomical Society of Japan

Dobashi, Kazuhito¹ 

[1] Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei 594-1, Tokyo 184-8501

关键词: atlases;    catalogs;    "ISM: cloud";    "ISM: dust";    "ISM: extinction";   

DOI  :  10.1093/pasj/63.sp1.S1

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Thispaperpresentsanatlasandcatalogofdarkcloudsderivedbasedonthe2MicronAllSkySurveyPointSourceCatalog(2MASSPSC).Colorexcessmapsof$$E$$($$J-H$$)and$$E$$($$H-K_{mS}$$)aswellasextinctionmapsof$$A_J$$,$$A_H$$,and$$A_{K_{mS}}$$coveringalloftheskyhavebeenproducedatthe1$$'$$gridwithachangingangularresolution($$sim$$1$$'$$–12$$'$$),dependingontheregionsinthesky.Mapsdrawnatthelower15$$'$$gridwithafixed1$$^circ$$resolutionwerealsoderivedforvarioussetsofthresholdmagnitudesinthe$$J$$,$$H$$,and$$K_{mS}$$bandstoestimatethebackgroundstarcolorsandstardensitiesneededtoderivethecolorexcessandextinctionmaps.Themapsobtainedinthisworkarepresentedonvariousscalesinaseriesoffiguresthatcanbeusedasanatlasofdarkcloudsforgeneralresearchpurposes.Onthebasisofthe$$E$$($$J-H$$)and$$A_J$$mapsdrawnatthe1$$'$$grid,wehavecarriedoutasystematicsurveyfordarkcloudsalloverthesky.Intotal,weidentified7614darkclouds,andmeasuredthecoordinates,extents,and$$A_V$$valuesforeachofthem.WealsosearchedfortheircounterpartsinapreviouslypublishedcatalogofdarkcloudsbasedontheopticalphotographicplatesDSS(Dobashietal.2005,PASJ,57,S1).Thesecloudparameters,includingtheinformationofthecounterparts,arecompiledintoanewcatalogofdarkclouds.Theatlasandcatalogorganizedinthispapermainlytracerelativelydenseregionsindarkclouds,revealinganumberofdensecloudcoresleadingtostarformation,whilethosepresentedbyDobashietal.(2005)basedontheopticaldatabasearemoresuitedtotraceless-denseregionsandtorevealtheglobalextentsofdarkclouds.Thesetwodatasetsarecomplementary,andalltogether,theyareusefultopicturethestructuresofdarkcloudsinvariousdensityranges.

【 授权许可】

Unknown