论文标题
MCG+07-20-052:在组环境中相互作用的矮人对
MCG+07-20-052: Interacting dwarf pair in a group environment
论文作者
论文摘要
我们介绍了一对相互作用的矮星系对,MCG+07-20-052,在银河系附近,质量螺旋星系NGC2998。MCG+07-20-052,位于105 kpc的Sky-Proded距离为105 kpc的NGC 2998和两个KMS kms sy-kms。我们观察到相互作用的MCG+07-20-052的成员(D1和D2)上的潮汐尾状扩展。相互作用的矮星系D1和D2的B频段绝对幅度分别为$ -17.17和$ - $ - $ 17.14 mag,而D2比D1明显蓝。我们使用巨大的Metrewave射电望远镜(GMRT)获得了NGC 2998系统的HI 21 cm线数据,以在相互作用的矮星系中以及NGC 2998组的星系中的中性氢(HI)发射更详细地了解中性氢(HI)发射。在HI运动学和形态学中,MCG+07-20-052中矮星系之间合并的证据也存在,我们发现HI主要集中在D2周围,这也显示了与D1相比,这也显示出更高水平的星形形成活性和较高的$ G-R $颜色指数。此外,我们在另一个成员Galaxy(NGC 3006)周围检测到较差的HI发射,该距离靠近MCG+07-20-052对,以41 kpc的天空投影距离。我们在这里将MCG+07-20-052 Pair-NGC 2998系统与其他已知的LMC-SMC-Milky Way类型系统进行比较,并讨论了矮人 - 划线相互作用的可能起源。
We present an observational study of the interacting pair of dwarf galaxies, MCG+07-20-052, in the vicinity of Milky Way mass spiral galaxy NGC 2998. MCG+07-20-052 is located at a sky-projected distance of 105 kpc from NGC 2998 and the two have a relative line-of-sight velocity of 60 kms. We observed tidal tail-like extensions on both members (D1 and D2) of the interacting pair MCG+07-20-052. The interacting dwarf galaxies, D1 and D2, have B-band absolute magnitudes of $-$17.17 and $-$17.14 mag, respectively, and D2 is significantly bluer than D1. We obtained HI 21 cm line data of the NGC 2998 system using the Giant Metrewave Radio Telescope (GMRT) to get a more detailed view of the neutral hydrogen (HI) emission in the interacting dwarf galaxies and in the galaxy members of the NGC 2998 group. Evidence of a merger between the dwarf galaxies in the MCG+07-20-052 is also present in the HI kinematics and morphology where we find that the HI is mostly concentrated around D2, which also shows a higher level of star-forming activity and bluer $g-r$ color index compared to D1. In addition, we detect extended tenuous HI emission around another member galaxy, NGC 3006, located close to the MCG+07-20-052-pair at a sky-projected distance of 41 kpc. We compare here our results from the MCG+07-20-052 pair-NGC 2998 system with other known LMC-SMC-Milky Way type systems and discuss the possible origin of the dwarf-dwarf interaction.