Cosmological constraints from the power spectrum of eBOSS emission line galaxies

Abstract We analyse the large-scale clustering in Fourier space of emission line galaxies (ELG) from the Data Release 16 of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey. The ELG sample contains 173,736 galaxies covering 1,170 square degrees in the redshift range 0.6 < z < 1.1. We perform a BAO measurement from the post-reconstruction power spectrum monopole, and study redshift space distortions (RSD) in the first three even multipoles. Photometric variations yield fluctuations of both the angular and radial survey selection functions. Those are directly inferred from data, imposing integral constraints which we model consistently. The full data set has only a weak preference for a BAO feature (1.4σ). At the effective redshift zeff = 0.845 we measure $D_{\rm V}(z_{\rm eff})/r_{\rm drag} = 18.33_{-0.62}^{+0.57}$, with DV the volume-averaged distance and rdrag the comoving sound horizon at the drag epoch. In combination with the RSD measurement, at zeff = 0.85 we find $f\sigma _8(z_{\rm eff}) = 0.289_{-0.096}^{+0.085}$, with f the growth rate of structure and σ8 the normalisation of the linear power spectrum, $D_{\rm H}(z_{\rm eff})/r_{\rm drag} = 20.0_{-2.2}^{+2.4}$ and DM(zeff)/rdrag = 19.17 ± 0.99 with DH and DM the Hubble and comoving angular distances, respectively. These results are in agreement with those obtained in configuration space, thus allowing a consensus measurement of fσ8(zeff) = 0.315 ± 0.095, $D_{\rm H}(z_{\rm eff})/r_{\rm drag} = 19.6_{-2.1}^{+2.2}$ and DM(zeff)/rdrag = 19.5 ± 1.0. This measurement is consistent with a flat ΛCDM model with Planck parameters.

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Imprint of DESI fiber assignment on the anisotropic power spectrum of emission line galaxies

Journal of Cosmology and Astroparticle Physics ◽

10.1088/1475-7516/2017/04/008 ◽

2017 ◽

Vol 2017 (04) ◽

pp. 008-008 ◽

Cited By ~ 13

Author(s):

Lucas Pinol ◽

Robert N. Cahn ◽

Nick Hand ◽

Uroš Seljak ◽

Martin White

Keyword(s):

Power Spectrum ◽

Emission Line ◽

Emission Line Galaxies

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A Study of the [OII]λ3727/Hα Flux Ratio of Emission Line Galaxies

Chinese Astronomy and Astrophysics ◽

10.1016/j.chinastron.2010.07.002 ◽

2010 ◽

Vol 34 (3) ◽

pp. 234-244 ◽

Cited By ~ 1

Author(s):

Gao Feng ◽

Kong Xu ◽

Lin Xuan-bin ◽

Zhang Wei ◽

Li Jun-rong

Keyword(s):

Emission Line ◽

Flux Ratio ◽

Emission Line Galaxies

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Extreme emission-line galaxies out toz~ 1 in zCOSMOS

Astronomy and Astrophysics ◽

10.1051/0004-6361/201322786 ◽

2015 ◽

Vol 578 ◽

pp. A105 ◽

Cited By ~ 36

Author(s):

R. Amorín ◽

E. Pérez-Montero ◽

T. Contini ◽

J. M. Vílchez ◽

M. Bolzonella ◽

...

Keyword(s):

Emission Line ◽

Emission Line Galaxies

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The completed SDSS-IV extended baryon oscillation spectroscopic survey: growth rate of structure measurement from anisotropic clustering analysis in configuration space between redshift 0.6 and 1.1 for the emission-line galaxy sample

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa3050 ◽

2020 ◽

Vol 499 (4) ◽

pp. 5527-5546 ◽

Cited By ~ 6

Author(s):

Amélie Tamone ◽

Anand Raichoor ◽

Cheng Zhao ◽

Arnaud de Mattia ◽

Claudio Gorgoni ◽

...

Keyword(s):

Growth Rate ◽

Correlation Function ◽

Emission Line ◽

Sloan Digital Sky Survey ◽

Linear Growth Rate ◽

Angular Diameter Distance ◽

Consensus Values ◽

Galaxy Sample ◽

Emission Line Galaxies ◽

Anisotropic Clustering

ABSTRACT We present the anisotropic clustering of emission-line galaxies (ELGs) from the Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) Data Release 16 (DR16). Our sample is composed of 173 736 ELGs covering an area of 1170 deg2 over the redshift range 0.6 ≤ z ≤ 1.1. We use the convolution Lagrangian perturbation theory in addition to the Gaussian streaming redshift space distortions to model the Legendre multipoles of the anisotropic correlation function. We show that the eBOSS ELG correlation function measurement is affected by the contribution of a radial integral constraint that needs to be modelled to avoid biased results. To mitigate the effect from unknown angular systematics, we adopt a modified correlation function estimator that cancels out the angular modes from the clustering. At the effective redshift, zeff = 0.85, including statistical and systematical uncertainties, we measure the linear growth rate of structure fσ8(zeff) = 0.35 ± 0.10, the Hubble distance $D_ H(z_{\rm eff})/r_{\rm drag} = 19.1^{+1.9}_{-2.1}$, and the comoving angular diameter distance DM(zeff)/rdrag = 19.9 ± 1.0. These results are in agreement with the Fourier space analysis, leading to consensus values of: fσ8(zeff) = 0.315 ± 0.095, $D_H(z_{\rm eff})/r_{\rm drag} = 19.6^{+2.2}_{-2.1}$, and DM(zeff)/rdrag = 19.5 ± 1.0, consistent with ΛCDM model predictions with Planck parameters.

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Spectral classification of emission-line galaxies

The Astrophysical Journal Supplement Series ◽

10.1086/191166 ◽

1987 ◽

Vol 63 ◽

pp. 295 ◽

Cited By ~ 1334

Author(s):

Sylvain Veilleux ◽

Donald E. Osterbrock

Keyword(s):

Emission Line ◽

Spectral Classification ◽

Emission Line Galaxies

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The Hamburg/SAO survey for emission–line galaxies

Astronomy and Astrophysics Supplement Series ◽

10.1051/aas:1999483 ◽

1999 ◽

Vol 137 (2) ◽

pp. 299-304 ◽

Cited By ~ 19

Author(s):

S. A. Pustilnik ◽

D. Engels ◽

A. V. Ugryumov ◽

V. A. Lipovetsky ◽

H.-J. Hagen ◽

...

Keyword(s):

Emission Line ◽

Emission Line Galaxies

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Low Metallicity Galaxies at z ~ 0.7: Keys to the Origins of Metallicity Scaling Laws

Proceedings of the International Astronomical Union ◽

10.1017/s1743921308025143 ◽

2008 ◽

Vol 4 (S255) ◽

pp. 397-401

Author(s):

David J. Rosario ◽

Carlos Hoyos ◽

David Koo ◽

Andrew Phillips

Keyword(s):

Star Formation ◽

Emission Line ◽

Galaxy Evolution ◽

Scaling Laws ◽

Temperature Sensitive ◽

Star Forming ◽

Low Metallicity ◽

Emission Line Galaxies ◽

Halo Masses ◽

Stellar Masses

AbstractWe present a study of remarkably luminous and unique dwarf galaxies at redshifts of 0.5 < z < 0.7, selected from the DEEP2 Galaxy Redshift survey by the presence of the temperature sensitive [OIII]λ4363 emission line. Measurements of this important auroral line, as well as other strong oxygen lines, allow us to estimate the integrated oxygen abundances of these galaxies accurately without being subject to the degeneracy inherent in the standard R23 system used by most studies. [O/H] estimates range between 1/5–1/10 of the solar value. Not surprisingly, these systems are exceedingly rare and hence represent a population that is not typically present in local surveys such as SDSS, or smaller volume deep surveys such as GOODS.Our low-metallicity galaxies exhibit many unprecedented characteristics. With B-band luminosities close to L*, thse dwarfs lie significantly away from the luminosity-metallicity relationships of both local and intermediate redshift star-forming galaxies. Using stellar masses determined from optical and NIR photometry, we show that they also deviate strongly from corresponding mass-metallicity relationships. Their specific star formation rates are high, implying a significant burst of recent star formation. A campaign of high resolution spectroscopic follow-up shows that our galaxies have dynamical properties similar to local HII and compact emission line galaxies, but mass-to-light ratios that are much higher than average star-forming dwarfs.The low metallicities, high specific star formation rates, and small halo masses of our galaxies mark them as lower redshift analogs of Lyman-Break galaxies, which, at z ~ 2 are evolving onto the metallicity sequence that we observe in the galaxy population of today. In this sense, these systems offer fundamental insights into the physical processes and regulatory mechanisms that drive galaxy evolution in that epoch of major star formation and stellar mass assembly.

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