Revealing the nebular properties and Wolf-Rayet population of IC10 with Gemini/GMOS

Revealing the nebular properties and Wolf-Rayet population of IC10 with Gemini/GMOS
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用 Gemini/GMOS 揭示 IC10 的星云特性和 Wolf-Rayet 族群

DOI:
10.1093/mnras/stx2124
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发表时间:
2017
影响因子:
4.8
通讯作者:
Tehrani K
Tehrani K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tehrani K

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我们使用 Gemini North 和 GMOS 对本星系群不规则星系 IC10 进行了深度成像和光谱调查,以揭示其全球沃尔夫-拉叶 (WR) 种群。对于 IC10,我们从星云 H α 光度中获得了 0.045 ± 0.023 M⊙yr−1 的恒星形成率 (SFR),这与小麦哲伦星云相当。我们还提出了修正后的星云氧丰度 log(O/H) + 12 = 8.40 ± 0.04,与 LMC 相当。此前有人提出,IC10 遵循其他本星系群中所见的 WR 亚型金属丰度依赖性,大量 WN 族群等待发现。我们的搜索发现了三名新的 WN 明星和六名等待确认的候选人,但几乎没有提供任何证据来支持这一说法。当按比例缩小到 IC10 的恒星形成率时,新的全球 WR 恒星总数为 29 颗,与大麦哲伦星云的星群一致。对于光谱证实的WR星,WC/WN比率降低至1.0;然而,包括所有潜在的候选者,并假设那些未经确认的恒星是 WN 恒星,则该比率将降低至 ∼0.7。我们将高 WC/WN 比率归因于 IC10 相对于麦哲伦星云的高恒星形成表面密度,这提高了能够产生 WC 恒星的大质量恒星的频率。
We present a deep imaging and spectroscopic survey of the Local Group irregular galaxy IC10 using Gemini North and GMOS to unveil its global Wolf–Rayet (WR) population. We obtain a star formation rate (SFR) of 0.045 ± 0.023 M⊙yr−1, for IC10 from the nebular H α luminosity, which is comparable to the Small Magellanic Cloud. We also present a revised nebular oxygen abundance of log(O/H) + 12 = 8.40 ± 0.04, comparable to the LMC. It has previously been suggested that for IC10 to follow the WR subtype-metallicity dependance seen in other Local Group galaxies, a large WN population awaits discovery. Our search revealed three new WN stars, and six candidates awaiting confirmation, providing little evidence to support this claim. The new global WR star total of 29 stars is consistent with the Large Magellanic Cloud population when scaled to the reduced SFR of IC10. For spectroscopically confirmed WR stars, the WC/WN ratio is lowered to 1.0; however, including all potential candidates, and assuming those unconfirmed to be WN stars, would reduce the ratio to ∼0.7. We attribute the high WC/WN ratio to the high star formation surface density of IC10 relative to the Magellanic Clouds, which enhances the frequency of high-mass stars capable of producing WC stars.
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