High-redshift galaxies and low-mass stars

High-redshift galaxies and low-mass stars
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高红移星系和低质量恒星

DOI:
10.1093/mnras/stu029
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发表时间:
2014
影响因子:
4.8
通讯作者:
Wilkins S
Wilkins S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wilkins S

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最近,近红外线巡天的灵敏度使我们能够探测到银河系的数量,在2007年甚至更远。现有的哈勃宽视场相机3(WFC 3)和可见光和红外天文观测望远镜(VISTA)红外相机(VIRCam)仪器允许进行远超过1 μ m的深度调查-这一能力将随着詹姆斯韦伯太空望远镜(JWST)的发射和调试而进一步扩展。随着对颜色和深度参数空间新区域的探索,确定了遥远星系调查的新挑战。在本文中,我们提出了广泛使用的测光系统中的L-和T-矮星的颜色的分析。我们还考虑了新发现的Y-矮星人口的影响-恒星仍然比T-矮星的光度选择和光谱跟踪微弱和遥远的星系更冷,质量更小。我们强调了在低信噪比条件下工作的危险,以及现有和未来样品的潜在污染。我们发现,哈勃/WFC3和VISTA/VIRCamY-滴选择目标星系在z7.5是容易受到污染的T-和Y-类恒星。未来的观测使用JWST,目标是2007星系人口,也很可能被证明是困难的,没有深中波段观测。我们表明,单发射线检测在典型的低信号噪声光谱观测也可能是可疑的,由于不寻常的光谱特性的冷矮星星星人口。
The sensitivity available to near-infrared surveys has recently allowed us to probe the galaxy population atz≈ 7 and beyond. The existingHubbleWide Field Camera 3 (WFC3) and Visible and Infrared Survey Telescope for Astronomy (VISTA) Infrared Camera (VIRCam) instruments allow deep surveys to be undertaken well beyond 1 μm – a capability that will be further extended with the launch and commissioning of theJames Webb Space Telescope(JWST). As new regions of parameter space in both colour and depth are probed, new challenges for distant galaxy surveys are identified. In this paper, we present an analysis of the colours of L- and T-dwarf stars in widely used photometric systems. We also consider the implications of the newly identified Y-dwarf population – stars that are still cooler and less massive than T-dwarfs for both the photometric selection and spectroscopic follow-up of faint and distant galaxies. We highlight the dangers of working in the low-signal-to-noise regime, and the potential contamination of existing and future samples. We find thatHubble/WFC3 and VISTA/VIRCamY-drop selections targeting galaxies atz∼ 7.5 are vulnerable to contamination from T- and Y-class stars. Future observations usingJWST, targeting thez∼ 7 galaxy population, are also likely to prove difficult without deep medium-band observations. We demonstrate that single emission line detections in typical low-signal-to-noise spectroscopic observations may also be suspect, due to the unusual spectral characteristics of the cool dwarf star population.
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