AGC 226067: A possible interacting low-mass system
AGC 226067: A possible interacting low-mass system
复制标题
AGC 226067：一种可能的相互作用的低质量系统
DOI：
10.1051/0004-6361/201526857
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Zaidi
中科院分区：
文献类型：
--
作者：
E. Adams;J. Cannon;K. Rhode;W. Janesh;S. Janowiecki;L. Leisman;R. Giovanelli;M. Haynes;T. Oosterloo;J. Salzer;T. Zaidi
我们提出了阿雷西博，GBT，VLA和WIYN/pODI的ALOFA源AGC 226067的观测。AGC 226067最初被认为是一个超紧凑的高速云和候选本星系群，在空间和运动学上与室女座星系团一致，并且多组光学对应物的识别没有解析恒星支持这个系统位于室女座距离（D=17 Mpc）的解释。综合观测结果显示，该系统由多个组件组成：与光学对应物（AGC 226067）相关的中央HI源，较小的仅HI组件（AGC 229490），第二光学组件（AGC 229491）和扩展的低表面亮度HI。只有约1/4的单碟HI辐射与AGC 226067有关，因此，我们得到M_HI/L_g ~ 6 Msun/Lsun，这比以前的工作要低。在D=17 Mpc时，AGC 226067的HI质量为1.5 x 10^7 Msun，L_g = 2.4 x 10^6 Lsun，AGC 229490（仅HI组件）的M_HI = 3.6 x 10^6 Msun，AGC 229491（第二光学组件）的L_g = 3.6 x 10^5 Lsun。这三个源的系统的性质是不确定的：AGC 226067和AGC 229490可能通过HI桥连接，AGC 229490和AGC 229491仅相隔0.5 '。当前数据未解决AGC 229490中的HI，其来源尚不清楚。我们讨论了这个系统的对象可能的情况：矮星系的相互作用系统，吸积到AGC 226067上的材料，或从AGC 226067剥离的材料。
We present Arecibo, GBT, VLA and WIYN/pODI observations of the ALFALFA source AGC 226067. Originally identified as an ultra-compact high velocity cloud and candidate Local Group galaxy, AGC 226067 is spatially and kinematically coincident with the Virgo cluster, and the identification by multiple groups of an optical counterpart with no resolved stars supports the interpretation that this systems lies at the Virgo distance (D=17 Mpc). The combined observations reveal that the system consists of multiple components: a central HI source associated with the optical counterpart (AGC 226067), a smaller HI-only component (AGC 229490), a second optical component (AGC 229491), and extended low surface brightness HI. Only ~1/4 of the single-dish HI emission is associated with AGC 226067; as a result, we find M_HI/L_g ~ 6 Msun/Lsun, which is lower than previous work. At D=17 Mpc, AGC 226067 has an HI mass of 1.5 x 10^7 Msun and L_g = 2.4 x 10^6 Lsun, AGC 229490 (the HI-only component) has M_HI = 3.6 x 10^6 Msun, and AGC 229491 (the second optical component) has L_g = 3.6 x 10^5 Lsun. The nature of this system of three sources is uncertain: AGC 226067 and AGC 229490 may be connected by an HI bridge, and AGC 229490 and AGC 229491 are separated by only 0.5'. The current data do not resolve the HI in AGC 229490 and its origin is unclear. We discuss possible scenarios for this system of objects: an interacting system of dwarf galaxies, accretion of material onto AGC 226067, or stripping of material from AGC 226067.