The Nature of Unresolved Soft X-Ray Emission from the Galactic Disk

Masui Kensuke; Mitsuda Kazuhisa; Yamasaki Noriko Y.; Takei Yoh; Kimura Shunsuke; Yoshino Tomotaka; McCammon Dan

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The Nature of Unresolved Soft X-Ray Emission from the Galactic Disk

机译：星系盘未解决的软X射线发射的性质

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Althoughabout40%ofthesoftX-raybackgroundemissionin0.4to1keVrangehasextragalacticoriginsandthusistotallyblockedbythegalacticabsorptioninmidplanedirections,itdecreasesatmostbyabout20%inmidplane.Suzakuobservationofthedirection,($$ell$$,$$b$$)$$=$$(235$$^circ$$,0$$^circ$$),showedanOvii$${ mK}alpha$$emissionintensitycomparablewiththatoftheMBM-12oncloudSuzakuobservation,butrevealedanarrowbumppeakedat$$sim$$0.9keV.Thelattercomponentispartlyfillingthedecreaseoftheextragalacticcomponentinmidplane.Thefeaturecanbewellrepresentedbyathinthermalemissionwithatemperatureofabout0.8keV.Becauseofthehighpressureimpliedforspatiallyextendedhotgas,theemissionislikelyasumofunresolvedfaintsources.WeconsideralargefractionoftheemissionoriginatesfromfaintdMstars.WeconstructedamodelspectrumforspatiallyunresolveddMstarsthatconsistentlyexplainstheobservedspectrumandthesurfacebrightness.ThemodelalsosuggeststhattheemissionfromdMstarsdecreasesveryrapidlywithincreasing$$b$$,andthusthatitcannotcompensateentirelythedecreaseoftheextragalacticcomponentat$$b$$$$sim$$2$$^circ$$a€“10$$^circ$$.

机译：尽管在0.4到1keV范围内约有40％的软X射线背景发射已经发生了激进的算术起源，并因此在中平面方向上被银河吸收完全阻止了，但它在中平面上的降幅却最多降低了约20％。 showedanOvii $$ {mK的阿尔法} $$ emissionintensitycomparablewiththatoftheMBM-12oncloudSuzakuobservation，butrevealedanarrowbumppeakedat $$ SIM $$ 0.9keV.Thelattercomponentispartlyfillingthedecreaseoftheextragalacticcomponentinmidplane.Thefeaturecanbewellrepresentedbyathinthermalemissionwithatemperatureofabout0.8keV.Becauseofthehighpressureimpliedforspatiallyextendedhotgas，theemissionislikelyasumofunresolvedfaintsources.WeconsideralargefractionoftheemissionoriginatesfromfaintdMstars.WeconstructedamodelspectrumforspatiallyunresolveddMstarsthatconsistentlyexplainstheobservedspectrumandthesurfacebrightness.ThemodelalsosuggeststhattheemissionfromdMstarsdecreasesveryrapidlywithincreasing $$ b $$，andthusthatitcannotcompensateentirelythedecrea seoftheextracalactic组件在$$ b $$$ sim $ 2 $$ ^ circ $$ a $ 10 $$ ^ circ $$

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《PASJ: Publications of the Astronomical Society of Japan》 |2009年第sp1期|共页
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Masui Kensuke; Mitsuda Kazuhisa; Yamasaki Noriko Y.; Takei Yoh; Kimura Shunsuke; Yoshino Tomotaka; McCammon Dan;
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7. The Nature of Unresolved Soft X-ray Emission from the Galactic Disk [O] . Masui, K., Mitsuda, K., Yamasaki, N. Y., 2008

机译：银河盘未解决的软X射线发射的性质

The Nature of Unresolved Soft X-Ray Emission from the Galactic Disk

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