arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05590astro-ph.GA
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矮塞弗特UGC 06728的宿主星系

The Host Galaxy of the Dwarf Seyfert UGC 06728

Misty C. Bentz

摘要:

我们提出了多色高分辨率成像的矮塞弗特UGC 06728的宿主星系。UGC 06728是目前能同时用直接质量约束和自旋约束描述的质量最小的黑洞,是比较黑洞演化模型的重要来源,但人们对它的宿主星系知之甚少。利用哈勃空间望远镜的光学和近红外成像,我们发现UGC 06728是一个棒状透镜星系(SB 0),棒的两端有突出的柄。我们干净地分离的AGN从解决星系的二维图像分解,从而使准确的表面亮度分布从星系的外缘一直到核心的所有过滤器中导出。基于图像中确定的51个候选球状星团的样本,球状星团光度函数预测到UCG 06728的距离为$32.5\pm3.5$ Mpc。结合星系测光和距离估计,我们导出了星光校正的活动星系核光度、星系的绝对星等和星系恒星质量的限制条件$\log M_{\star}/M_{\odot}=9.9\pm0.2$。

英文摘要:

We present multi-color high-resolution imaging of the host galaxy of the dwarf Seyfert UGC 06728. As the lowest-mass black hole to be described with both a direct mass constraint and a spin constraint, UGC 06728 is an important source for comparison with black hole evolutionary models, yet little is known about the host galaxy. Using Hubble Space Telescope imaging in the optical and near-infrared, we find that UGC 06728 is a barred lenticular (SB0) galaxy with prominent ansae at the ends of the bar. We cleanly separated the AGN from the resolved galaxy with two-dimensional image decompositions, thus allowing accurate surface brightness profiles to be derived in all filters from the outer edge of the galaxy all the way into the nucleus. Based on a sample of 51 globular cluster candidates identified in the images, the globular cluster luminosity function predicts a distance to UCG 06728 of $32.5\pm3.5$ Mpc. Combining the galaxy photometry with the distance estimate, we derive a starlight-corrected AGN luminosity, the absolute magnitude of the galaxy, and a constraint on the galaxy stellar mass of $\log M_{\star}/M_{\odot}=9.9\pm0.2$.

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