Microwave observations of spinning dust emission in NGC 6946☆

被引：30

作者：

Scaife, Anna M. M. ^{[1
]}

Nikolic, Bojan ^{[2
,3
]}

Green, David A. ^{[3
]}

Beck, Rainer ^{[4
]}

Davies, Matthew L. ^{[3
]}

Franzen, Thomas M. O. ^{[3
]}

Grainge, Keith J. B. ^{[2
,3
]}

Hobson, Michael P. ^{[3
]}

Hurley-Walker, Natasha ^{[3
]}

Lasenby, Anthony N. ^{[2
,3
]}

Olamaie, Malak ^{[3
]}

Pooley, Guy G. ^{[3
]}

Rodriguez-Gonzalvez, Carmen ^{[3
]}

Saunders, Richard D. E. ^{[2
,3
]}

Scott, Paul F. ^{[3
]}

Shimwell, Timothy W. ^{[3
]}

Titterington, David J. ^{[3
]}

Waldram, Elizabeth M. ^{[3
]}

Zwart, Jonathan T. L. ^{[5
]}

机构：

[1] Dublin Inst Adv Studies, Dublin 2, Ireland

[2] Kavli Inst Cosmol Cambridge, Cambridge CB3 0HA, England

[3] Univ Cambridge, Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England

[4] MPIfR, D-53121 Bonn, Germany

[5] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 406卷 / 01期

关键词：

radiation mechanisms: general; galaxies: individual: NGC 6946; RADIATION; SPECTRUM; REGION;

D O I：

10.1111/j.1745-3933.2010.00878.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report new cm-wave measurements at five frequencies between 15 and 18 GHz of the continuum emission from the reportedly anomalous 'region 4' of the nearby galaxy NGC 6946. We find that the emission in this frequency range is significantly in excess of that measured at 8.5 GHz, but has a spectrum from 15 to 18 GHz consistent with optically thin free-free emission from an ultracompact H ii region. In combination with previously published data, we fit four emission models containing different continuum components using the Bayesian spectrum analysis package radiospec. These fits show that, in combination with data at other frequencies, a model with a spinning dust component is slightly preferred to those that possess better-established emission mechanisms.

引用

页码：L45 / L49

页数：5

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