论文标题
发现近红外的酒吧和一个碰撞戒指的伪块车轮车轮
Discovery of a near-infrared bar and a pseudobulge in the collisional ring galaxy Cartwheel
论文作者
论文摘要
我们通过对ESO Archive的近红外（NIR）k $ _s $出色质量的近红外（NIR）k $ _s $ band图像进行仔细的形态分析（see = 0.42 \ arcsec）的仔细形态学分析，报告了原型碰撞环形车轮中的杆，伪块和未解决的点源的发现。条形为椭圆形，半高轴的长度为3.23 \ arcsec \（$ \ sim $ 2.09〜kpc），沿其几乎平坦的光分布。凸起几乎是圆形的（椭圆度= 0.21），有效半径为1.62 \ arcsec \（$ \ sim $ 1.05〜kpc），刻有0.99的刻有sersic指数，典型的Pseudobulges参数在晚期星系中。新发现的栏在光学图像中也无法识别，即使由于其红色和尘土飞扬的特征的存在组合，哈勃太空望远镜的两个较高空间分辨率都超过了两个较高的空间分辨率。观察到的酒吧和伪块最有可能属于Cartwheel的前副祖细胞。在原型碰撞环银河车轮中发现条形的是第一个确认棒可以与中央凸起（Pseudo）等形态学结构一起在落水碰撞中生存的预测的观察证据。
We report the discovery of a bar, a pseudobulge and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) K$_s$ band image of excellent quality (seeing=0.42\arcsec) at the ESO archive. The bar is oval-shaped with a semi-major axis length of 3.23\arcsec\($\sim$2.09~kpc), with almost a flat light distribution along it. The bulge is almost round (ellipticity=0.21) with an effective radius of 1.62\arcsec\ ($\sim$1.05~kpc) and a Sersic index of 0.99, parameters typical of pseudobulges in late-type galaxies. The newly discovered bar is not recognisable as such in the optical images even with more than a factor of two higher spatial resolution of the Hubble Space Telescope, due to a combination of its red colour and the presence of dusty features. The observed bar and pseudobulge most likely belonged to the pre-collisional progenitor of the Cartwheel. The discovery of a bar in an archetype collisional ring galaxy Cartwheel is the first observational evidence to confirm the prediction that bars can survive a drop-through collision along with the morphological structures like a central bulge (pseudo).
