تقرير
The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA
| العنوان: | The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA |
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| المؤلفون: | Eastwood, Michael W., Anderson, Marin M., Monroe, Ryan M., Hallinan, Gregg, Catha, Morgan, Dowell, Jayce, Garsden, Hugh, Greenhill, Lincoln J., Hicks, Brian C., Kocz, Jonathon, Price, Danny C., Schinzel, Frank K., Vedantham, Harish, Wang, Yuankun |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics |
| الوصف: | The 21\,cm transition of neutral hydrogen is opening an observational window into the cosmic dawn of the universe---the epoch of first star formation. We use 28\,hr of data from the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA) to place upper limits on the spatial power spectrum of 21\,cm emission at $z \approx 18.4$ ($\Delta_{21} \lesssim 10^4\,\text{mK}$), and within the absorption feature reported by the EDGES experiment (Bowman et al. 2018). In the process we demonstrate the first application of the double Karhunen-Lo\`{e}ve transform for foreground filtering, and diagnose the systematic errors that are currently limiting the measurement. We also provide an updated model for the angular power spectrum of low-frequency foreground emission measured from the northern hemisphere, which can be used to refine sensitivity forecasts for next-generation experiments. Comment: The authors really hoping you're having a fantastic day. You keep being awesome! |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-3881/ab2629 |
| URL الوصول: | http://arxiv.org/abs/1906.08943 |
| رقم الأكسشن: | edsarx.1906.08943 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-3881/ab2629 |
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