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首页> 外文期刊>The Astrophysical journal >INTERSTELLAR Hα LINE PROFILES TOWARD HD 93521 AND THE LOCKMAN WINDOW
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INTERSTELLAR Hα LINE PROFILES TOWARD HD 93521 AND THE LOCKMAN WINDOW

机译：星际Hα线向HD 93521和LOCKMAN窗口的轮廓

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摘要

We have used the Wisconsin Hα Mapper (WHAM) facility to measure the interstellar Hα emission toward the high Galactic latitude O star HD 93521 (l = 183.1°, b = + 62.2°). Three emission components were detected along this line of sight. These components have radial velocities of -10, -51, and -90 km s~(-1) with respect to the local standard of rest (LSR) and have Ha intensities of 0.20, 0.15, and 0.023 R, respectively, corresponding to emission measures of 0.55, 0.42, and 0.06 cm~(-6) pc. We have also measured the Hα emission toward the direction l = 148.5°, b = + 53.0°, which lies in the region of exceptionally low H Ⅰ column density known as the Lockman Window. An emission component is detected in this direction at -1 km s~(-1) (LSR), with an intensity of 0.20 R (0.55 cm~(-6) pc). In addition, we studied the direction l = 163.5°, b = + 53.5°. No Galactic emission was detected along this line of sight, and upper limits on the possible intensity of Galactic emission toward this direction are 0. 11 R at the LSR and 0.06 R at -50 km s~(-1). As part of the process of separating the interstellar from the terrestrial emission, we also detected and characterized 12 faint (～ 0.03-0.15 R), unidentified atmospheric lines present in WHAM Ha spectra. Finally, we have used WHAM to obtain [O Ⅰ] λ6300 spectra along the line of sight toward HD 93521. We do not conclusively detect interstellar [O Ⅰ] emission toward the star, but place an upper limit of 0.060 R on the [O Ⅰ] intensity of the intermediate-velocity (-51 km s~(-1)) component. If the temperature of the gas is 10,000 K, this limit implies that, within the Hα-emitting region, the hydrogen ionization fraction n(H~+)(H_(total)) > 0.6.
机译：我们已经使用了威斯康星州Hα测绘仪（WHAM）来测量朝向高银纬度O星HD 93521（l = 183.1°，b = + 62.2°）的星际Hα发射。沿此视线检测到三个排放分量。这些分量相对于静止标准（LSR）的径向速度为-10，-51和-90 km s〜（-1），并且Ha强度分别为0.20、0.15和0.023 R，分别对应于发射量为0.55、0.42和0.06 cm〜（-6）pc。我们还测量了沿方向l = 148.5°，b = + 53.0°的Hα发射，该方向位于称为洛克曼窗的HⅠ列密度极低的区域。在-1 km s〜（-1）（LSR）处检测到该方向的发射分量，强度为0.20 R（0.55 cm〜（-6）pc）。另外，我们研究了方向l = 163.5°，b = + 53.5°。沿该视线未检测到银河系发射，朝该方向的银河系发射可能强度的上限为LSR处的0. 11 R和-50 km s〜（-1）处的0.06R。作为将星际与地面发射分离的过程的一部分，我们还检测并表征了WHAM Ha光谱中存在的12条微弱（〜0.03-0.15 R），未识别的大气线。最后，我们使用WHAM沿HD 93521沿视线获得了[OⅠ]λ6300光谱。我们并没有最终确定朝着恒星的星际[OⅠ]发射，而是在[O]上设置了0.060 R的上限。 Ⅰ]中速（-51 km s〜（-1））分量的强度。如果气体的温度为10,000 K，则该极限意味着在Hα发射区域内，氢离子化分数n（H〜+）/ n（H_（total））> 0.6。

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