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Correlation between Interstellar Polarization and Dust Temperature: Is the Alignment of Grains by Radiative Torques Ubiquitous?

机译:星际极化与粉尘温度之间的关系:辐射扭矩对谷物的排列无处不在吗?

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Wehaveinvestigatedtheefficiencyofinterstellarpolarization,$$p_lambda/A_lambda$$,where$$p_lambda$$isthefractionallinearpolarizationand$$A_lambda$$istheextinction,in14linesofsightasafunctionofthewavelength,$$lambda$$.WeusedthedataoflinesofsighttothePleiadesclusterobtainedwiththelow-dispersionspectropolarimeterHBSaswellasthoseinliterature.Ithasbeenfoundthatthepolarizationefficiency,$$p_lambda/A_lambda$$,isproportionaltoexp($$-eta/lambda$$)inwavelength,$$lambda$$$$approx$$0.4a€“0.8$$mu$$m,where$$eta$$isaparameterthatvariesfrom0.5to1.2$$mu$$m.Wefindthat$$eta$$isnegativelycorrelatedwiththedusttemperaturededucedfrominfrareddatabySchlegeletal.(1998,ApJ,500,525),suggestingthatthepolarizationefficiencyishigherinshortwavelengthsforhighertemperature.Accordingtothealignmenttheorybyradiativetorques(RATs),iftheradiationisstronger,RATswillmakesmallgrainsalignbetter,andthepolarizationefficiencywillincreaseatshortwavelengths.Ourfindingofthecorrelationbetween$$eta$$andthetemperatureisconsistentwithwhatisexpectedwiththealignmentmechanismbyRATs.
机译:Wehaveinvestigatedtheefficiencyofinterstellarpolarization,$$ p_lambda / A_lambda $$,其中$$ p_lambda $$ isthefractionallinearpolarizationand $$ A_lambda $$ istheextinction,in14linesofsightasafunctionofthewavelength,$$拉姆达$$。WeusedthedataoflinesofsighttothePleiadesclusterobtainedwiththelow-dispersionspectropolarimeterHBSaswellasthoseinliterature.Ithasbeenfoundthatthepolarizationefficiency,$$ p_lambda / A_lambda $$,isproportionaltoexp($$ -eta / lambda $$)波长,$$ lambda $$$$约$ 0.4a€“ 0.8 $ mu $$ m,其中$ eta $$ isaparameter的范围从0.5到1.2 $ mu $$ m。我们发现η与Schlegeletal从红外数据推导出的温度温度负相关。(1998,ApJ,500,525),这表明极化效率在较短的波长上对于较高的温度而言较高。根据温度的大小,在相同的波长和波长下,如果辐射强度与波长之间的关系变大,则辐射强度(R)越短,则辐射强度越强。预期与RAT的对齐机制有关。

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