| Abstract: | The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct
novel cosmological observations using the BOSS spectrograph at Apache Point
Observatory. Observations will be simultaneous with the Time Domain
Spectroscopic Survey (TDSS) designed for variability studies and the
Spectroscopic Identification of eROSITA Sources (SPIDERS) program designed for
studies of X-ray sources. eBOSS will use four different tracers to measure the
distance-redshift relation with baryon acoustic oscillations (BAO) in the
clustering of matter. Using more than 250,000 new, spectroscopically confirmed
luminous red galaxies at a median redshift z=0.72, we project that eBOSS will
yield measurements of $d_A(z)$ to an accuracy of 1.2% and measurements of H(z)
to 2.1% when combined with the z>0.6 sample of BOSS galaxies. With ~195,000 new
emission line galaxy redshifts, we expect BAO measurements of $d_A(z)$ to an
accuracy of 3.1% and H(z) to 4.7% at an effective redshift of z= 0.87. A sample
of more than 500,000 spectroscopically-confirmed quasars will provide the first
BAO distance measurements over the redshift range 0.9<z<2.2, with expected
precision of 2.8% and 4.2% on $d_A(z)$ and H(z), respectively. Finally, with
60,000 new quasars and re-observation of 60,000 quasars known from BOSS, we
will obtain new Lyman-alpha forest measurements at redshifts z>2.1; these new
data will enhance the precision of $d_A(z)$ and H(z) by a factor of 1.44
relative to BOSS. Furthermore, eBOSS will provide new tests of General
Relativity on cosmological scales through redshift-space distortion
measurements, new tests for non-Gaussianity in the primordial density field,
and new constraints on the summed mass of all neutrino species. Here, we
provide an overview of the cosmological goals, spectroscopic target sample,
demonstration of spectral quality from early data, and projected cosmological
constraints from eBOSS. |
REGISTER
Did you like this article? 
