The extent of dust in NGC 891 from Herschel/SPIRE images

被引：33

作者：

Bianchi, S. ^{[1
]}

Xilouris, E. M. ^{[2
]}

机构：

[1] INAF, Osservatorio Astrofis Arcetri, I-50125 Florence, Italy

[2] Natl Obs Athens, Inst Astron & Astrophys, Athens 15236, Greece

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 531卷

关键词：

galaxies: individual: NGC 891; galaxies: spiral; dust; extinction; submillimeter: galaxies; radiative transfer; SPECTRAL ENERGY-DISTRIBUTION; SPIRAL GALAXIES; INFRARED-EMISSION; GALACTIC DISKS; NGC-891; PHOTOMETRY; THICK; LIGHT; MODEL;

D O I：

10.1051/0004-6361/201116772

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyse Herschel/SPIRE images of the edge-on spiral galaxy NGC 891 at 250, 350, and 500 mu m. Using a 3D radiative transfer model we confirm that the dust has radial fall-off similar to the stellar disk. The dust disk shows a break at about 12 kpc from the centre, where the profile becomes steeper. Beyond this break, emission can be traced up to 90% of the optical disk on the NE side. To the SW, we confirm dust emission associated with the extended, asymmetric HI disk, previously detected by the Infrared Space Observatory (ISO). This emission is marginally consistent with the large diffuse dust disk inferred from radiative transfer fits to optical images. No excess emission is found above the plane beyond that of the thin, unresolved, disk.

引用

页数：4

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