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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Infrared Spectral Energy Distribution of Galaxies in the AKARI All Sky Survey: Correlations with Galaxy Properties, and Their Physical Origin
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Infrared Spectral Energy Distribution of Galaxies in the AKARI All Sky Survey: Correlations with Galaxy Properties, and Their Physical Origin

机译：AKARI全天候测量中星系的红外光谱能量分布：与银河特性的相关性及其物理起源

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摘要

Wehavestudiedthepropertiesofmorethan1600low-redshiftgalaxiesbyutilizinghigh-qualityinfraredfluxmeasurementsoftheAKARIAll-SkySurveyandphysicalquantitiesbasedonopticaland21-cmobservations.Ourgoalistounderstandthephysicsdeterminingtheinfraredspectralenergydistribution(SED).Theratioofthetotalinfraredluminosity,$$L_{ mTIR}$$,tothestar-formationrate(SFR)istightlycorrelatedbyapower-lawtospecificSFR(SSFR),and$$L_{ mTIR}$$isagoodSFRindicatoronlyforgalaxieswiththelargestSSFR.Wediscoveredatightlinearcorrelationfornormalgalaxiesbetweentheradiationfieldstrengthofdustheating,estimatedbyinfraredSEDfits($$U_h$$),andthatofgalactic-scaleinfraredemission($$U_{ mTIR}proptoL_{ mTIR}/R^2$$),where$$R$$istheopticalsizeofagalaxy.Thedispersionof$$U_h$$alongthisrelationis$$sim$$0.3dex,correspondingto$$sim$$13%dispersioninthedusttemperature.Thisscalingandthe$$U_h/U_{ mTIR}$$ratiocanbeexplainedphysicallybyathinlayerofheatingsourcesembeddedinathicker,optically-thickdustscreen.Thedataalsoindicatethattheheatedfractionofthetotaldustmassisanti-correlatedtothedustcolumndensity,supportingthisinterpretation.Inthelarge$$U_{ mTIR}$$limit,thedataofcircumnuclearstarburstsindicatetheexistenceofanupperlimiton$$U_h$$,correspondingtothemaximumSFRpergasmassof$$sim$$10Gyr$$^{-1}$$.Wefindthatthenumberofgalaxiessharplydropswhentheybecomeopticallythinagainstdust-heatingradiation,suggestingthatafeedbackprocesstogalaxyformation(likelybythephotoelectricheating)isworkingwhendust-heatingradiationisnotself-shieldedonagalacticscale.Implicationsarediscussedforthe$$M_{{ mH{I}}}$$-sizerelation,theKennicutt-Schmidtrelation,andgalaxyformationinthecosmologicalcontext.
机译：Wehavestudiedthepropertiesofmorethan1600low-redshiftgalaxiesbyutilizinghigh-qualityinfraredfluxmeasurementsoftheAKARIAll-SkySurveyandphysicalquantitiesbasedonopticaland21-cmobservations.Ourgoalistounderstandthephysicsdeterminingtheinfraredspectralenergydistribution（SED）.Theratioofthetotalinfraredluminosity，$$ L_ {mTIR} $$，tothestar-formationrate（SFR）istightlycorrelatedbyapower-lawtospecificSFR（SSFR），和$$ L_ {mTIR} $$ isagoodSFRindicatoronlyforgalaxieswiththelargestSSFR。我们发现了正常星系之间的近似线性相关关系，这些星系之间的持续辐射强度由红外SED拟合（$$ U_h $$）估算，与银河规模的红外发射率（$$ U_ {mTIR} proptoL_ {mTIR} / R ^ h $ icalal的大小一样，其中$$ R $的大小是$$ R $。 sim $ 0.3dex，对应于在温度温度下的$ sim $ 13％的分散。此缩放比例和$ U_h / U_ {mTIR} $$的比率可以通过一层加热源物理地解释为嵌入在较厚的粉尘筛网中（光学厚度的防尘网）。数据还表明该热分nofthetotaldustmassisanti-correlatedtothedustcolumndensity，supportingthisinterpretation.Inthelarge $$ U_ {mTIR} $$限制，thedataofcircumnuclearstarburstsindicatetheexistenceofanupperlimiton $$ U_h $$，correspondingtothemaximumSFRpergasmassof $$ SIM $$ 10Gyr $$ ^ { - 1}。$$ Wefindthatthenumberofgalaxiessharplydropswhentheybecomeopticallythinagainstdust-heatingradiation，suggestingthatafeedbackprocesstogalaxyformation（likelybythephotoelectricheating）isworkingwhendust辐射不是自我屏蔽的银河尺度。讨论了$ M _ {{mH {I}}} $$大小关系，Kennicutt-Schmidtrelation和宇宙学背景下的星系形成的含义。

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