论文标题
光谱调查及其可能影响的线混乱：重子振荡位置的变化
Line confusion in spectroscopic surveys and its possible effects: Shifts in Baryon Acoustic Oscillations position
论文作者
论文摘要
罗马太空望远镜将在一系列红移中调查约1700万个排放线星系。它的主要目标是在低红移和[O III]发射线星系处的H $α$发射线星系在高红移处。罗马太空望远镜将通过单线识别估算这些星系的红移。这表明其他排放线星系可能被误认为是主要目标。特别是，很难区分H $β$和[O III]线，因为这两条线在波长中接近，因此光度信息可能不足以可靠地分离它们。错误识别h $β$发射极是[O III]发射极会导致星系中推断的径向位置的变化约为90 mpc/h。该长度尺度类似于Baryon声学振荡（BAO）尺度，并且可能会移动和拓宽BAO峰，可能会在确定BAO峰位置时引入错误。我们定性地描述了这种新系统的效果，并通过具有发射线星系的LightCone模拟进一步量化了它。
Roman Space Telescope will survey about 17 million emission-line galaxies over a range of redshifts. Its main targets are H$α$ emission-line galaxies at low redshifts and [O III] emission-line galaxies at high redshifts. The Roman Space Telescope will estimate the redshift these galaxies with single line identification. This suggests that other emission-line galaxies may be misidentified as the main targets. In particular, it is hard to distinguish between the H$β$ and [O III] lines as the two lines are close in wavelength and hence the photometric information may not be sufficient to separate them reliably. Misidentifying H$β$ emitter as [O III] emitter will cause a shift in the inferred radial position of the galaxy by approximately 90 Mpc/h. This length scale is similar to the Baryon Acoustic Oscillation (BAO) scale and could shift and broaden the BAO peak, possibly introduce errors in determining the BAO peak position. We qualitatively describe the effect of this new systematic and further quantify it with a lightcone simulation with emission-line galaxies.
