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arXiv 1907.02111astro-ph.GA
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J-PLUS:用于光度测量的带有发射线的合成星系星表

J-PLUS: Synthetic galaxy catalogues with emission lines for photometric surveys

David Izquierdo-Villalba, Raul E. Angulo, Alvaro Orsi, Guillaume Hurier, Gonzalo Vilella-Rojo, Silvia Bonoli, Carlos López-Sanjuan, Jailson Alcaniz, Javier Cena… 展开作者

David Izquierdo-Villalba, Raul E. Angulo, Alvaro Orsi, Guillaume Hurier, Gonzalo Vilella-Rojo, Silvia Bonoli, Carlos López-Sanjuan, Jailson Alcaniz, Javier Cenarro, David Cristóbal-Hornillos, Renato Dupke, Alessandro Ederoclite, Carlos Hernández-Monteagudo, Antonio Marín-Franch, Mariano Moles, Claudia Mendes de Oliveira, Laerte Sodré, Jesús Varela, Héctor Vázquez Ramió

摘要:

我们提出了一个合成的星系光锥专门设计的窄带光学测光调查。为了减少时间离散性的影响,与以前的作品,我们直接包括光锥建设中的\texttt{L-Galaxies}半解析模型应用于subhalo合并树的{ \tt千年}模拟。此外,我们增加了一个模型的星云发射的恒星形成的地区,这是至关重要的正确预测的窄/中带光度的星系。解释,我们认为,单独为每个星系,9个不同的线的贡献:$\rm Lyα$(1216磅)、\Hb(4861磅)、\Ha(6563磅)、{ \oii }(3727,3729)、{ \oiii }(4959,5007)、$\rm [\ion{Ne}{III}]$(3870)、{PDMATHAMU}(6300)、$\rm [\ion{N}{II}]$(6548,6583)和$\rm [\ion{S}{II}]$(6717,6731)。我们验证我们的光锥比较星系数计数,角集群,\Ha,\Hb,{ \oii }和{ \oiiiFd }光度函数的汇编观测。作为我们的模拟光锥的应用程序,我们生成为J-PLUS量身定制的目录,这是一个大型光学星系调查,具有5个宽波段和7个中波段滤波器。我们研究的调查,以正确识别的能力,一个简单的\textit{three filter method},人口的发射线星系在不同的红移。我们发现星系光谱能量分布中的$4000Å$突变可以被误认为是线发射。然而,所有显著的超出(大于0.4星等)都可以正确而明确地归因于发射线星系。我们的星表是公开发布的,以方便他们在解释窄带调查和量化的影响线发射在宽带测光使用。

英文摘要:

We present a synthetic galaxy lightcone specially designed for narrow-band optical photometric surveys. To reduce time-discreteness effects, unlike previous works, we directly include the lightcone construction in the \texttt{L-Galaxies} semi-analytic model applied to the subhalo merger trees of the {\tt Millennium} simulation. Additionally, we add a model for the nebular emission in star-forming regions, which is crucial for correctly predicting the narrow/medium-band photometry of galaxies. Explicitly, we consider, individually for each galaxy, the contribution of 9 different lines: $\rm Lyα$ (1216Å), \Hb (4861Å), \Ha (6563Å), {\oii} (3727Å, 3729Å), {\oiii} (4959Å, 5007Å), $\rm [\ion{Ne}{III}]$ (3870Å), {\oi} (6300Å), $\rm [\ion{N}{II}]$ (6548Å, 6583Å), and $\rm [\ion{S}{II}]$ (6717Å, 6731Å). We validate our lightcone by comparing galaxy number counts, angular clustering, and \Ha, \Hb, {\oii} and {\oiiiFd} luminosity functions to a compilation of observations. As an application of our mock lightcones, we generate catalogues tailored for J-PLUS, a large optical galaxy survey featuring 5 broad and 7 medium band filters. We study the ability of the survey to correctly identify, with a simple \textit{three filter method}, a population of emission-line galaxies at various redshifts. We show that the $4000Å$ break in the spectral energy distribution of galaxies can be misidentified as line emission. However, all significant excess (larger than 0.4 magnitudes) can be correctly and unambiguously attributed to emission line galaxies. Our catalogues are publicly released to facilitate their use in interpreting narrow-band surveys and for quantifying the impact of line emission in broad band photometry.

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