arXiv 1709.078842017-09-22astro-ph.GA

哈勃空间望远镜对活动矮星系RGG 118的成像

Hubble Space Telescope Imaging of the Active Dwarf Galaxy RGG 118

Vivienne F. Baldassare, Amy E. Reines, Elena Gallo, Jenny E. Greene

备注：: Accepted to Astrophysical Journal. 11 pages, 8 figures
DOI：: 10.3847/1538-4357/aa9067

摘要：

RGG 118（SDSS 1523+1145）是一个附近的矮盘星系（$z=0.0243$），被发现在其核心有一个活跃的$\sim50,000$太阳质量的黑洞（Baldassare et al. 2015）。RGG 118是已知含有活动星系核的矮星系的一个不断增长的集体样本-直到最近，这一群体只包含少数物体。在这里，我们报告新的\textit{Hubble Space Telescope}宽视场相机3紫外和红外成像的RGG 118，其主要目标是分析其结构。使用2-D参数化建模，我们发现，RGG 118的形态是最好的描述外螺旋盘，内部组件符合一个pseudobulge，和中央PSF。PSF的光度与活动星系核主导的中心点源一致。我们测量了“pseudobull”的光度和质量，并确认在RGG 118中心的黑洞是根据$M_{BH}-M_{\rm bulge}$和$M_{BH}-L_{\rm bulge}$关系的质量。这一结果与盘状星系中的黑洞主要通过长期过程生长的图片是一致的。

英文摘要：

RGG 118 (SDSS 1523+1145) is a nearby ($z=0.0243$), dwarf disk galaxy ($M_{\ast}\approx2\times10^{9} M_{\odot}$) found to host an active $\sim50,000$ solar mass black hole at its core (Baldassare et al. 2015). RGG 118 is one of a growing collective sample of dwarf galaxies known to contain active galactic nuclei -- a group which, until recently, contained only a handful of objects. Here, we report on new \textit{Hubble Space Telescope} Wide Field Camera 3 UVIS and IR imaging of RGG 118, with the main goal of analyzing its structure. Using 2-D parametric modeling, we find that the morphology of RGG 118 is best described by an outer spiral disk, inner component consistent with a pseudobulge, and central PSF. The luminosity of the PSF is consistent with the central point source being dominated by the AGN. We measure the luminosity and mass of the "pseudobulge" and confirm that the central black hole in RGG 118 is under-massive with respect to the $M_{BH}-M_{\rm bulge}$ and $M_{BH}-L_{\rm bulge}$ relations. This result is consistent with a picture in which black holes in disk-dominated galaxies grow primarily through secular processes.

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