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arXiv 0905.4494astro-ph.CO
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Spitzer/IRAC暗场中星族候选III超新星的初步搜寻

A Pilot Search for Population III Supernova Candidates in the Spitzer/IRAC Dark Field

Mark I Frost, Jason Surace, Leonidas A Moustakas, Jessica Krick

摘要:

我们已经进行了一个系统的搜索候选超新星从高红移第三族恒星在一个领域,已观察到重复成像的节奏为2-3周,超过2.2年的基线,斯皮策/IRAC暗场。各个时期在IRAC通道1(3.6 μ m)中达到1 μ m的典型5-sigma深度。需要至少四个历元的覆盖范围,搜索的总有效面积为214平方弧分。这些数据的前所未有的深度和多时代的性质使其成为探测瞬变物体的第一次尝试的理想选择,这些瞬变物体可能是来自原始金属丰度第一恒星的候选发光对不稳定超新星。在广泛的时间范围内进行搜索,允许假定候选人的光曲线平台期的不同持续时间。所有候选人都通过检查斯皮策成像数据以及整个领域的深层HST/ACS F814 W成像进行了审查。虽然发现了许多具有斯皮策变率的解析源天体,但没有瞬变天体可以被确定为高红移超新星候选者。由此产生的95%的置信水平上限为23/平方度/年,与高原时间尺度下的400/(1+z)天和亮度以上的源~1 uJy。

英文摘要:

We have undertaken a systematic search for candidate supernovae from high-redshift Population III stars in a field that has been observed with repeated imaging on a cadence of 2-3 weeks over a 2.2 year baseline, the Spitzer/IRAC Dark Field. The individual epochs reach a typical 5-sigma depth of 1 uJy in IRAC Channel 1 (3.6 um). Requiring a minimum of four epochs coverage, the total effective area searched is 214 sq arcminutes. The unprecedented depth and multi-epochal nature of these data make it ideal for a first foray to detect transient objects which may be candidate luminous Pair Instability Supernovae from the primordial-metallicity first stars. The search was conducted over a broad range of timescales, allowing for different durations of the putative candidates' light curve plateau phases. All candidates were vetted by inspection of the Spitzer imaging data, as well as deep HST/ACS F814W imaging available over the full field. While many resolved-source objects were found with Spitzer variability, no transient objects could plausibly be identified as high-redshift supernovae candidates. The resulting 95% confidence level upper limit is 23/sq deg/yr, for sources with plateau timescales under 400/(1+z) days and brightnesses above ~1 uJy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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