Emission from the circumgalactic medium: from cosmological zoom-in simulations to multiwavelength observables

Emission from the circumgalactic medium: from cosmological zoom-in simulations to multiwavelength observables
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环绕银河系介质的发射:从宇宙学放大模拟到多波长可观测值

DOI:
10.1093/mnras/stz2238
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发表时间:
2019
影响因子:
4.8
通讯作者:
Augustin R
Augustin R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Augustin R

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我们模拟从星系晕发射的通量,以量化环星系介质(CGM)的亮度。我们使用专门的放大宇宙学模拟与流体动力学自适应网格细化coderamses,这是进化到z = 0,并达到最大空间分辨率为380 h-1 pc和气体质量分辨率高达dennis区域。考虑到紫外背景荧光、重力冷却和连续谱发射,我们利用云发射率模型计算了CGM中不同谱线(如Lyα、Civ、Ovi、Cvi、Oviii)的预期发射。在Lyα的情况下,我们还考虑了连续光子的散射。我们将我们的预测与目前的观测结果进行了比较,发现在调整Lyα逃逸分数后,它们在任何红移处都很好地吻合。我们将联合收割机的模拟观测与暗星系际红移发射气球-2(FIREBall-2; UV气球摄谱仪)和HARMONI(ELT上的可见光和近红外IFU)的仪器模型相结合,以预测使用任一仪器的CGM观测,并优化目标选择和观测策略。我们的研究结果表明,在红移为0.7的CGM中,对于明亮的星系(NUV 18等),FIREBall-2将可以观察到Lyα发射,而像Ovi和Civ这样的金属线仍然具有挑战性。HARMONI被发现非常适合于研究不同红移的CGM与各种示踪剂。
We simulate the flux emitted from galaxy haloes in order to quantify the brightness of the circumgalactic medium (CGM). We use dedicated zoom-in cosmological simulations with the hydrodynamical adaptive mesh refinement coderamses, which are evolved down toz= 0 and reach a maximum spatial resolution of 380h−1pc and a gas mass resolution up toin the densest regions. We compute the expected emission from the gas in the CGM usingcloudyemissivity models for different lines (e.g. Lyα, Civ, Ovi, Cvi, Oviii) considering UV background fluorescence, gravitational cooling and continuum emission. In the case of Lyα, we additionally consider the scattering of continuum photons. We compare our predictions to current observations and find them to be in good agreement at any redshift after adjusting the Lyα escape fraction. We combine our mock observations with instrument models for Faint Intergalactic Redshifted Emission Balloon-2 (FIREBall-2; UV balloon spectrograph) and HARMONI (visible and NIR IFU on the ELT) to predict CGM observations with either instrument and optimize target selections and observing strategies. Our results show that Lyα emission from the CGM at a redshift of 0.7 will be observable with FIREBall-2 for bright galaxies (NUV∼18 mag), while metal lines like Oviand Civwill remain challenging to detect. HARMONI is found to be well suited to study the CGM at different redshifts with various tracers.
DOI: 10.1086/309900
发表时间: 1995-09
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发表时间: 2016
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DOI: --
发表时间: 2017
期刊:
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DOI: 10.1088/0004-637x/809/2/163
发表时间: 2015-04
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影响因子: --
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F. A. Battaia;J. Hennawi;J. Prochaska;S. C. M. F. Astronomie;UCOLick Observatory;U. Cruz;Eth
通讯作者: F. A. Battaia;J. Hennawi;J. Prochaska;S. C. M. F. Astronomie;UCOLick Observatory;U. Cruz;Eth