arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.03602astro-ph.GAastro-ph.CO
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未来星系红移巡天的HST Grism导出预报

HST Grism-derived Forecasts for Future Galaxy Redshift Surveys

Micaela B. Bagley, Claudia Scarlata, Vihang Mehta, Harry Teplitz, Ivano Baronchelli, Daniel J. Eisenstein, Lucia Pozzetti, Andrea Cimatti, Michael Rutkowski, Yu… 展开作者

Micaela B. Bagley, Claudia Scarlata, Vihang Mehta, Harry Teplitz, Ivano Baronchelli, Daniel J. Eisenstein, Lucia Pozzetti, Andrea Cimatti, Michael Rutkowski, Yun Wang, Alexander Merson

摘要:

相互补充的欧几里德和罗马星系红移巡天将使用H α和[OIII]选择的发射线星系作为$0.9 \lesssim z \lesssim 1.9$(H α)和$1.5 \lesssim z \lesssim 2.7$([OIII])大尺度结构的示踪剂。为了优化暗能量研究中的红移观测,必须对观测量中预期的α发射星系的数量有一个可靠和足够精确的了解。此外,这些未来的发射线星系样本将像所有的无狭缝光谱调查一样,受到复杂的选择函数的影响,该函数取决于星系的大小和光度,线等效宽度,以及由错误识别单个发射线星系而产生的红移误差。专注于Euclid调查的细节,我们结合了两个无缝光谱WFC 3-IR数据集- 3D-HST+AGHAST和WISP调查-构建了一个覆盖0.56度$^2$区域并包括1277个发射线星系的类欧几里得样本。我们检测到1091($\sim$ 3270度$^{-2}$)H α +[NII]-发射星系的范围$0.9\leq z \leq 1.6$和162($\sim$ 440度$^{-2}$)[OIII] $λ$ 5007-发射器在$1.5\leq z \leq 2.3$与线通量$\geq 2 \times 10^{-16}$ erg s $^{-1}$ cm $^{-2}$。Ha +[NII]等效宽度分布的中位数为$\sim$ 250“,连续谱和Ha +[NII]发射的有效半径与$\sim$ 0.38”的中位数和显著散射($σ\sim $ 0.2”$-$ 0.35”)相关。最后,我们探讨了未来欧几里德样本中红移错误识别的普遍性,发现$\sim$ 14-20%和$\sim$ 6%的潜在污染率分别下降到$2\times 10^{-16}$和$6 \times 10^{-17}$ erg s $^{-1}$ cm $^{-2}$,尽管随着波长覆盖范围的增加,这些百分比下降到几乎为零。

英文摘要:

The mutually complementary Euclid and Roman galaxy redshift surveys will use Halpha- and [OIII]-selected emission line galaxies as tracers of the large scale structure at $0.9 \lesssim z \lesssim 1.9$ (Halpha) and $1.5 \lesssim z \lesssim 2.7$ ([OIII]). It is essential to have a reliable and sufficiently precise knowledge of the expected numbers of Halpha-emitting galaxies in the survey volume in order to optimize these redshift surveys for the study of dark energy. Additionally, these future samples of emission-line galaxies will, like all slitless spectroscopy surveys, be affected by a complex selection function that depends on galaxy size and luminosity, line equivalent width, and redshift errors arising from the misidentification of single emission-line galaxies. Focusing on the specifics of the Euclid survey, we combine two slitless spectroscopic WFC3-IR datasets -- 3D-HST+AGHAST and the WISP survey -- to construct a Euclid-like sample that covers an area of 0.56 deg$^2$ and includes 1277 emission line galaxies. We detect 1091 ($\sim$3270 deg$^{-2}$) Halpha+[NII]-emitting galaxies in the range $0.9\leq z \leq 1.6$ and 162 ($\sim$440 deg$^{-2}$) [OIII]$λ$5007-emitters over $1.5\leq z \leq 2.3$ with line fluxes $\geq 2 \times 10^{-16}$ erg s$^{-1}$ cm$^{-2}$. The median of the Halpha+[NII] equivalent width distribution is $\sim$250Å, and the effective radii of the continuum and Halpha+[NII] emission are correlated with a median of $\sim$0.38" and significant scatter ($σ\sim $0.2"$-$0.35"). Finally, we explore the prevalence of redshift misidentification in future Euclid samples, finding potential contamination rates of $\sim$14-20% and $\sim$6% down to $2\times 10^{-16}$ and $6 \times 10^{-17}$ erg s$^{-1}$ cm$^{-2}$, respectively, though with increased wavelength coverage these percentages drop to nearly zero.

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