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We analyze the line-of-sight baryonic acoustic feature in the two-pointcorrelation function {\xi} of the Sloan Digital Sky Survey (SDSS) luminous redgalaxy (LRG) sample (0.16 < z < 0.47). By defining a narrow line-of-sightregion, rp < 5.5 Mpc/h, where rp is the transverse separation component, wemeasure a strong excess of clustering at ~ 110 Mpc/h, as previously reported inthe literature. We also test these results in an alternative coordinate system,by defining the line-of-sight as {\theta} < 3{\deg}, where {\theta} is theopening angle. This clustering excess appears much stronger than the feature inthe better-measured monopole. A fiducial {\Lambda}CDM non-linear model inredshift-space predicts a much weaker signature. We use realistic mock catalogsto model the expected signal and noise. We find that the line-of-sightmeasurements can be explained well by our mocks as well as by a featureless{\xi} = 0. We conclude that there is no convincing evidence that the strongclustering measurement is the line-of-sight baryonic acoustic feature. We alsoevaluate how detectable such a signal would be in the upcoming BaryonOscillation Spectroscopic Survey LRG volume (BOSS). Mock LRG catalogs (z < 0.6)suggest that: (i) the narrow line- of-sight cylinder and cone defined aboveprobably will not reveal a detectable acoustic feature in BOSS; (ii) aclustering measurement as high as that in the current sample can be ruled out(or confirmed) at a high confidence level using a BOSS-sized data set; and(iii) an analysis with wider angular cuts, which provide better signal-to-noiseratios, can nevertheless be used to compare line-of-sight and transversedistances, and thereby constrain the expansion rate H(z) and diameter distanceDA(z).

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Regarding the Line-of-Sight Baryonic Acoustic Feature in the Sloan  Digital Sky Survey and Baryon Oscillation Spectroscopic Survey Luminous Red  Galaxy Samples