Measuring galaxy [O ii] emission line doublet with future ground-based wide-field spectroscopic surveys - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2013

Measuring galaxy [O ii] emission line doublet with future ground-based wide-field spectroscopic surveys

(1) , (2, 1) , (3) , (4) , (5) , (4) , (6)
1
2
3
4
5
6

Abstract

The next generation of wide-field spectroscopic redshift surveys will map the large-scale galaxy distribution in the redshift range 0.7 ≤ z ≤ 2 to measure baryonic acoustic oscillations (BAO). The primary optical signature used in this redshift range comes from the [Oii] emission line doublet, which provides a unique redshift identification that can minimize confusion with other single emission lines. To derive the required spectrograph resolution for these redshift surveys, we simulate observations of the [Oii] (λλ 3727, 3729) doublet for various instrument resolutions, and line velocities. We foresee two strategies for the choice of the resolution for future spectrographs for BAO surveys. For bright [Oii] emitter surveys ([Oii] flux ~30 × 10-17  erg   cm-2   s-1 like SDSS-IV/eBOSS), a resolution of R ~ 3300 allows the separation of 90 percent of the doublets. The impact of the sky lines on the completeness in redshift is less than 6 percent. For faint [Oii] emitter surveys ([Oii] flux ~10 × 10-17  erg   cm-2   s-1 like DESi), the detection improves continuously with resolution, so we recommend the highest possible resolution, the limit being given by the number of pixels (4k by 4k) on the detector and the number of spectroscopic channels (2 or 3).
Fichier principal
Vignette du fichier
aa22452-13.pdf (154.86 Ko) Télécharger le fichier
Origin : Publication funded by an institution
Loading...

Dates and versions

cea-01135472 , version 1 (25-03-2015)

Identifiers

Cite

Johan Comparat, Jean-Paul Kneib, Roland Bacon, Nick J. Mostek, Jeffrey A. Newman, et al.. Measuring galaxy [O ii] emission line doublet with future ground-based wide-field spectroscopic surveys. Astronomy and Astrophysics - A&A, 2013, 559, pp.A18. ⟨10.1051/0004-6361/201322452⟩. ⟨cea-01135472⟩
270 View
276 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More