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arXiv 2005.02772astro-ph.GA
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SDSS-IV MaNGA:旋涡星系中空间分辨的尘埃衰减

SDSS-IV MaNGA: spatially resolved dust attenuation in spiral galaxies

Michael J. Greener, Alfonso Aragón-Salamanca, Michael R. Merrifield, Thomas G. Peterken, Amelia Fraser-McKelvie, Karen L. Masters, Coleman M. Krawczyk, Nicholas… 展开作者

Michael J. Greener, Alfonso Aragón-Salamanca, Michael R. Merrifield, Thomas G. Peterken, Amelia Fraser-McKelvie, Karen L. Masters, Coleman M. Krawczyk, Nicholas F. Boardman, Médéric Boquien, Brett H. Andrews, Jonathan Brinkmann, Niv Drory

摘要:

由于尘埃几何形状的局部变化,在恒星形成的螺旋星系中的尘埃衰减以不同的方式影响恒星和气体。我们提出了空间分辨的测量尘埃衰减的样本232这样的恒星形成的螺旋星系,来自光谱获得的SDSS-IV的MANGA调查。尘埃衰减影响这些星系的恒星星族(使用全光谱恒星星族拟合方法获得)的气体中的尘埃衰减(来自巴尔末减量)进行了比较。这两个衰减措施增加的地方区域的星系具有较高的恒星形成率;尘埃衰减影响的恒星星族增加更多,所以比气体中的尘埃衰减,导致尘埃衰减的比例影响的恒星星族的气体中的尘埃衰减降低的地方区域的星系具有较高的恒星形成率密度。在星系的旋臂和旋臂间区域之间,这些尘埃衰减量没有系统的差异。虽然气体中的尘埃衰减和影响恒星星族的尘埃衰减都随银河系中心半径而减小,但这两个量的比值并不随半径而变化。然而,这个比例确实随着星系恒星质量的增加而系统地减少。对这两种尘埃衰减测量的径向剖面的分析表明,在靠近恒星形成螺旋星系中心的地方,有不成比例的高浓度的诞生云(包括气体、年轻恒星和星团尘埃)。

英文摘要:

Dust attenuation in star-forming spiral galaxies affects stars and gas in different ways due to local variations in dust geometry. We present spatially resolved measurements of dust attenuation for a sample of 232 such star-forming spiral galaxies, derived from spectra acquired by the SDSS-IV MaNGA survey. The dust attenuation affecting the stellar populations of these galaxies (obtained using full spectrum stellar population fitting methods) is compared with the dust attenuation in the gas (derived from the Balmer decrement). Both of these attenuation measures increase for local regions of galaxies with higher star formation rates; the dust attenuation affecting the stellar populations increases more so than the dust attenuation in the gas, causing the ratio of the dust attenuation affecting the stellar populations to the dust attenuation in the gas to decrease for local regions of galaxies with higher star formation rate densities. No systematic difference is discernible in any of these dust attenuation quantities between the spiral arm and inter-arm regions of the galaxies. While both the dust attenuation in the gas and the dust attenuation affecting the stellar populations decrease with galactocentric radius, the ratio of the two quantities does not vary with radius. This ratio does, however, decrease systematically as the stellar mass of the galaxy increases. Analysis of the radial profiles of the two dust attenuation measures suggests that there is a disproportionately high concentration of birth clouds (incorporating gas, young stars and clumpy dust) nearer to the centres of star-forming spiral galaxies.

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