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arXiv 1609.04820astro-ph.GA
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低光度SPIRAL DRAGN的发现

The Discovery of a Low-Luminosity SPIRAL DRAGN

D. D. Mulcahy, M. Y. Mao, I. Mitsuishi, A. M. M. Scaife, A. O. Clarke, Y. Babazaki, H. Kobayashi, R. Suganuma, H. Matsumoto, Y. Tawara

摘要:

标准的星系形成模型预测,大规模的双叶射电源,被称为DRAGN,将始终由椭圆星系托管。尽管如此,近年来也发现了少量的旋涡星系拥有这样的源。这些所谓的螺旋形DRAGN仍然非常罕见,只有$\sim 5$病例被广泛接受。在这里,我们报告的一个新的螺旋DRAGN的数据从巨型米波射电望远镜(GMRT)在322兆赫的偶然发现。主星系MCG+07-47-10是一个正面朝上的晚型Sbc星系,有着独特的旋臂和突出的凸起,暗示着高质量的黑洞。利用WISE红外和GALEX紫外数据,我们证明该星系的恒星形成速率为0.16-0.75 M $_{\odot}$ yr $^{-1}$,射电光度主要由恒星形成决定。我们证明,这个螺旋形的DRAGN有类似的环境属性,这一类的其他人,但有一个相对较低的射电光度$L_{\rm 1.4GHz}$ = 1.12 $\times$ 10 $^{22}$ W Hz $^{-1}$,两个数量级小于其他已知的螺旋形的DRAGN。我们认为,这可能表明存在一个以前未知的低光度人口的螺旋龙。

英文摘要:

Standard galaxy formation models predict that large-scale double-lobed radio sources, known as DRAGNs, will always be hosted by elliptical galaxies. In spite of this, in recent years a small number of spiral galaxies have also been found to host such sources. These so-called spiral DRAGNs are still extremely rare, with only $\sim 5$ cases being widely accepted. Here we report on the serendipitous discovery of a new spiral DRAGN in data from the Giant Metrewave Radio Telescope (GMRT) at 322 MHz. The host galaxy, MCG+07-47-10, is a face-on late-type Sbc galaxy with distinctive spiral arms and prominent bulge suggesting a high black hole mass. Using WISE infra-red and GALEX UV data we show that this galaxy has a star formation rate of 0.16-0.75 M$_{\odot}$yr$^{-1}$, and that the radio luminosity is dominated by star-formation. We demonstrate that this spiral DRAGN has similar environmental properties to others of this class, but has a comparatively low radio luminosity of $L_{\rm 1.4GHz}$ = 1.12$\times$10$^{22}$ W Hz$^{-1}$, two orders of magnitude smaller than other known spiral DRAGNs. We suggest that this may indicate the existence of a previously unknown low-luminosity population of spiral DRAGNS.

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