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首页> 外文期刊>The Astrophysical journal >ANDROMEDA Ⅷ : A NEW TIDALLY DISTORTED SATELLITE OF M31
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ANDROMEDA Ⅷ : A NEW TIDALLY DISTORTED SATELLITE OF M31

机译：ANDROMEDAⅧ：M31的新的畸变卫星

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摘要

We report the detection of a new satellite of M31, projected close to M32. Andromeda Ⅷ is tidally distorted, with length ～10 kpc and width a few kiloparsecs. It contains 5-12 planetary nebulae and 1-3 globular clusters and has a velocity of -204 km s~(-1) with respect to M31, some 350 km s~(-1) away from M32's velocity. There are also ～4 x 10~5 solar mass of H Ⅰ, well-separated from the disk, at the same position and velocity. The satellite has luminosity of 1.2-2.4 x 10~8 solar luminosity and a central surface brightness of the order of μ_v = 24. Both these values are typical of Local Group dwarf galaxies. Its surface brightness is some 6 mag brighter than any of the stellar streams found in the Milky Way or M31. The three associated globular clusters have reddening consistent with foreground reddening from the Milky Way only, making it likely that the satellite is in front of M31, unlike the giant tidal stream of Ibata et al., which is behind M31 in the southeast quadrant. However, the major axis of And Ⅷ is aligned with the western edge of this giant stream, and we suggest that its unusual fan shape is caused by superposition of two streams, the westernmost of which was tidally stripped from And Ⅷ.
机译：我们报告检测到一颗新的M31卫星，预计接近M32。仙女座da畸变，长度〜10 kpc，宽度几千帕秒。它包含5-12个行星状星云和1-3个球状星团，相对于M31的速度为-204 km s〜（-1），距离M32的速度约350 km s〜（-1）。在相同的位置和速度下，还有〜4 x 10〜5的HⅠ太阳质量，它与圆盘完全分开。该卫星的光度为1.2-2.4 x 10〜8太阳光度，中心表面亮度约为μ_v=24。这两个值都是本地群矮星系的典型值。它的表面亮度比银河系或M31中发现的任何恒星流都要亮6 mag。三个相关的球状星团的变红仅与银河系中的前景变红一致，这使得卫星很可能位于M31的前方，这与Ibata等人的巨型潮汐流不同，后者位于东南象限的M31之后。但是，And the的长轴与这条大溪流的西边对齐，因此我们建议其异常的扇形是由两股溪流的叠加引起的，其中最西端的溪流从AndⅧ剥离。

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