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EVIDENCE FOR A PHYSICALLY ASSOCIATED COMPANION GALAXY TO I Zw 18

机译：物理同伴星系对I Zw 18的证据

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摘要

Using the William Herschel Telescope ISIS spectrograph, deep long-slit spectra were obtained of the ionized gas across the blue compact dwarf galaxy I Zw 18 and in an irregular galaxy located 15″ to the northwest. Heliocentric radial velocities of Hα and Hβ emission lines were measured over a 50″ length spanning the main body of I Zw 18 all the way to a central bright emission knot of the companion galaxy. This emission shows a smoothly varying double-sinusoidal variation in radial velocity over the length of the slit, which corresponds to about 2.5 kpc in the plane of the sky for an adopted distance of 10 Mpc for I Zw 18. Our primary result is that the radial velocity of an Hα knot near the center of the companion galaxy is the same as the systemic radial velocity of the ionized gas in the center of the main body of I Zw 18. We also observe a smoothly varying velocity field in the ionized gas between, which we interpret to be strong evidence for the two stellar systems' physical closeness to each other.
机译：使用William Herschel望远镜ISIS光谱仪，获得了跨越蓝色致密矮星系I Zw 18和西北15“的不规则星系中的电离气体的深长缝光谱。在跨越I Zw 18的主体一直到伴星系的中心明亮发射结的50“长度上，测量了Hα和Hβ发射线的日心中心径向速度。该辐射显示出在缝隙的长度上径向速度的双正弦曲线平滑变化，对于I Zw 18，在采用10 Mpc的距离时，对应于天空平面中的约2.5 kpc。我们的主要结果是伴随星系中心附近的Hα结的径向速度与I Zw 18主体中心处的电离气体的系统径向速度相同。我们还观察到电离气体之间的平稳变化的速度场，我们认为这是两个恒星系统彼此物理接近的有力证据。

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