PACS and SPIRE photometer maps of M33: First results of the Herschel M33 extended survey (HERM33ES)

PACS and SPIRE photometer maps of M33: First results of the Herschel M33 extended survey (HERM33ES)
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M33 的 PACS 和 SPIRE 光度计图:Herschel M33 扩展勘测 (HERM33ES) 的第一个结果

DOI:
10.1051/0004-6361/201014613
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发表时间:
2010
影响因子:
6.5
通讯作者:
Kramer
Kramer
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kramer

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背景在HERM 33 ES关键计划的框架内,我们正在研究附近贫金属螺旋星系M 33中形成星际介质的星星,利用Herschel的高分辨率和灵敏度。目的我们使用PACS和SPIRE地图在100,160,250,350和500μm波长,为了研究谱能量分布(SED)随银河系中心距离的变化,使用2kpc宽的椭圆环中的方位平均通量进行详细的SED模拟,以银河系为中心的距离为8千秒差距。简单的等温和两个组件的灰体模型,与固定的灰尘发射率指数,拟合到24μm和500μm之间的SED也使用MIPS/Spitzerdata,以获得第一次估计的尘埃物理conditions.ResultsThe远红外和亚毫米地图揭示了分支,打结的螺旋结构的M 33。在所有SPIRE图(250-500μm)中均可见一个潜在的弥漫盘。两个组件适合的SED同意比等温模型与观察到的,总的和径向平均的通量密度。β固定为1.5的双组分模型最适合全局和径向SED。冷尘埃成分明显占主导地位;温暖的成分的相对质量小于0.3%的所有拟合。热分量的温度没有得到很好的限制,发现约为60 K±10 K。对于最佳拟合模型,冷组分的温度从2 kpc半径内的~24 K显著下降到6 kpc径向距离外的13 K。在β= 1.5的情况下,星系的平均气尘比是太阳值的1.5倍,与M 33的太阳下金属丰度大致一致。
ContextWithin the framework of the HERM33ES key program, we are studying the star forming interstellar medium in the nearby, metal-poor spiral galaxy M 33, exploiting the high resolution and sensitivity ofHerschel.AimsWe use PACS and SPIRE maps at 100, 160, 250, 350, and 500μm wavelength, to study the variation of the spectral energy distributions (SEDs) with galacto-centric distance.MethodsDetailed SED modeling is performed using azimuthally averaged fluxes in elliptical rings of 2 kpc width, out to 8 kpc galacto-centric distance. Simple isothermal and two-component grey body models, with fixed dust emissivity index, are fitted to the SEDs between 24μm and 500μm using also MIPS/Spitzerdata, to derive first estimates of the dust physical conditions.ResultsThe far-infrared and submillimeter maps reveal the branched, knotted spiral structure of M 33. An underlying diffuse disk is seen in all SPIRE maps (250–500μm). Two component fits to the SEDs agree better than isothermal models with the observed, total and radially averaged flux densities. The two component model, withβfixed at 1.5, best fits the global and the radial SEDs. The cold dust component clearly dominates; the relative mass of the warm component is less than 0.3% for all the fits. The temperature of the warm component is not well constrained and is found to be about 60 K±10 K. The temperature of the cold component drops significantly from ~24 K in the inner 2 kpc radius to 13 K beyond 6 kpc radial distance, for the best fitting model. The gas-to-dust ratio forβ= 1.5, averaged over the galaxy, is higher than the solar value by a factor of 1.5 and is roughly in agreement with the subsolar metallicity of M 33.
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