J/A+A/559/A85 1D Lya forest power spectrum (Palanque-Delabrouille+, 2013)
The one-dimensional Lyα forest power spectrum from BOSS.
Palanque-Delabrouille N., Yeche C., Borde A., Le Goff J.-M., Rossi G.,
Viel M., Aubourg E., Bailey S., Bautista J., Blomqvist M., Bolton A.,
Bolton J.S., Busca N.G., Carithers B., Croft R.A.C., Dawson K.S.,
Delubac T., Font-Ribera A., Ho S., Kirkby D., Lee K.-G., Margala D.,
Miralda-Escude J., Muna D., Myers A.D., Noterdaeme P., Paris I.,
Petitjean P., Pieri M.M., Rich J., Rollinde E., Ross N.P., Schlegel D.J.,
Schneider D.P., Slosar A., Weinberg D.H.
<Astron. Astrophys. 559, A85 (2013)>
=2013A&A...559A..85P 2013A&A...559A..85P
ADC_Keywords: Models ; Spectroscopy
Keywords: cosmology: observations - large scale structure of the Universe -
intergalactic medium - cosmological parameters
Abstract:
We have developed two independent methods to measure the
one-dimensional power spectrum of the transmitted flux in the
Lyman-α forest. The first method is based on a Fourier
transform, and the second on a maximum likelihood estimator. The two
methods are independent and have different systematic uncertainties.
The determination of the noise level in the data spectra was subject
to a novel treatment, because of its significant impact on the derived
power spectrum.
We applied the two methods to 13,821 quasar spectra from SDSS-III/BOSS
DR9 (Baryon Oscillation Spectroscopic Survey, BOSS,
2013AJ....145...10D 2013AJ....145...10D) selected from a larger sample of over 60,000
spectra on the basis of their high quality, large signal-to-noise
ratio, and good spectral resolution. The power spectra measured using
either approach are in good agreement over all twelve redshift bins
from =2.2 to =4.4, and scales from 0.001(km/s)-1 to
0.02(km/s)-1. We determine the methodological and instrumental
systematic uncertainties of our measurements.
Description:
The files contain the data describing the measured 1D power spectrum
and the correlations between bins from the BOSS Lyman-alpha data.
table4a.dat and table5a.dat:
P1D results obtained with the Fourier transform and the likelihood
method respectively, for each k and z bin.
cct4b*.dat and cct5b*.dat:
Correlation matrices between k bins for each z bin, for the Fourier
transform and the likelihood method respectively. There are 12 HDUs,
one for each redshift bin from =2.2 (HDU 1, table[45]b1.dat) to
=4.4 (HDU 12, table[45]b12.dat).
Each HDU contains a binary table with 35 bins x 35 entries for the
Fourier transform method, and 32 bins x 32 entries for the likelihood
method. The tables contain the correlation coefficients. The scale ki
corresponding to entry (or bin) i can be read in the corresponding
entry of table4a.dat or table5a.dat.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4a.dat 92 420 Power spectrum with the Fourier transform
table5a.dat 92 384 Power spectrum with the likelihood
cct4b1.dat 489 35 Fourier k-bin correlations for redshift bin =2.2
cct4b2.dat 489 35 Fourier k-bin correlations for redshift bin =2.4
cct4b3.dat 489 35 Fourier k-bin correlations for redshift bin =2.6
cct4b4.dat 489 35 Fourier k-bin correlations for redshift bin =2.8
cct4b5.dat 489 35 Fourier k-bin correlations for redshift bin =3.0
cct4b6.dat 489 35 Fourier k-bin correlations for redshift bin =3.2
cct4b7.dat 489 35 Fourier k-bin correlations for redshift bin =3.4
cct4b8.dat 489 35 Fourier k-bin correlations for redshift bin =3.6
cct4b9.dat 489 35 Fourier k-bin correlations for redshift bin =3.8
cct4b10.dat 489 35 Fourier k-bin correlations for redshift bin =4.0
cct4b11.dat 489 35 Fourier k-bin correlations for redshift bin =4.2
cct4b12.dat 489 35 Fourier k-bin correlations for redshift bin =4.4
cct5b1.dat 447 32 Likelihood k-bin correlations, redshift bin =2.2
cct5b2.dat 447 32 Likelihood k-bin correlations, redshift bin =2.4
cct5b3.dat 447 32 Likelihood k-bin correlations, redshift bin =2.6
cct5b4.dat 447 32 Likelihood k-bin correlations, redshift bin =2.8
cct5b5.dat 447 32 Likelihood k-bin correlations, redshift bin =3.0
cct5b6.dat 447 32 Likelihood k-bin correlations, redshift bin =3.2
cct5b7.dat 447 32 Likelihood k-bin correlations, redshift bin =3.4
cct5b8.dat 447 32 Likelihood k-bin correlations, redshift bin =3.6
cct5b9.dat 447 32 Likelihood k-bin correlations, redshift bin =3.8
cct5b10.dat 447 32 Likelihood k-bin correlations, redshift bin =4.0
cct5b11.dat 447 32 Likelihood k-bin correlations, redshift bin =4.2
cct5b12.dat 447 32 Likelihood k-bin correlations, redshift bin =4.4
table4a.fits 2880 7 FITS version of table4a
table5a.fits 2880 6 FITS version of table5a
table4b.fits 2880 73 k-bin correlations with the Fourier transform
tables cct4* as unique FITS file
table5b.fits 2880 61 k-bin correlations with the likelihood,
tables cct5* as unique FITS file
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Byte-by-byte Description of file: table4a.dat table5a.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- nz [1/12] Redshift bin number
4- 5 I2 --- nk [1/35] Scale number within the redshift bin
7- 9 F3.1 --- z [2.2/4.4] Redshift bin (1)
11- 22 E12.8 s/km k [0.001/0.020] Scale value (2)
25- 36 E12.8 km/s Pk Power spectrum Pk
39- 50 E12.8 km/s Pkstat Statistical 1σ uncertainty on Pk
53- 64 E12.8 km/s Pknoise Noise power spectrum Pk_noise-/W2
67- 78 E12.8 km/s Pkmetal Metals power spectrum Pkmetal
81- 92 E12.8 km/s Pksyst Systematic 1σ uncertainty on Pk
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Note (1): Redshifts values are 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8,
4.0, 4.2 and 4.4.
Note (2): Scale value for the correlation coefficient k(nk) in
tables 4b and 5b resp. (cct4b* and cct5b*)
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Byte-by-byte Description of file: cct4b*.dat cct5b*.dat
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Bytes Format Units Label Explanations
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1- 13 E13.8 --- k1 Correlation coefficient for scale k1 (1)
15- 27 E13.8 --- k2 Correlation coefficient for scale k2 (1)
29- 41 E13.8 --- k3 Correlation coefficient for scale k3 (1)
43- 55 E13.8 --- k4 Correlation coefficient for scale k4 (1)
57- 69 E13.8 --- k5 Correlation coefficient for scale k5 (1)
71- 83 E13.8 --- k6 Correlation coefficient for scale k6 (1)
85- 97 E13.8 --- k7 Correlation coefficient for scale k7 (1)
99-111 E13.8 --- k8 Correlation coefficient for scale k8 (1)
113-125 E13.8 --- k9 Correlation coefficient for scale k9 (1)
127-139 E13.8 --- k10 Correlation coefficient for scale k10 (1)
141-153 E13.8 --- k11 Correlation coefficient for scale k11 (1)
155-167 E13.8 --- k12 Correlation coefficient for scale k12 (1)
169-181 E13.8 --- k13 Correlation coefficient for scale k13 (1)
183-195 E13.8 --- k14 Correlation coefficient for scale k14 (1)
197-209 E13.8 --- k15 Correlation coefficient for scale k15 (1)
211-223 E13.8 --- k16 Correlation coefficient for scale k16 (1)
225-237 E13.8 --- k17 Correlation coefficient for scale k17 (1)
239-251 E13.8 --- k18 Correlation coefficient for scale k18 (1)
253-265 E13.8 --- k19 Correlation coefficient for scale k19 (1)
267-279 E13.8 --- k20 Correlation coefficient for scale k20 (1)
281-293 E13.8 --- k21 Correlation coefficient for scale k21 (1)
295-307 E13.8 --- k22 Correlation coefficient for scale k22 (1)
309-321 E13.8 --- k23 Correlation coefficient for scale k23 (1)
323-335 E13.8 --- k24 Correlation coefficient for scale k24 (1)
337-349 E13.8 --- k25 Correlation coefficient for scale k25 (1)
351-363 E13.8 --- k26 Correlation coefficient for scale k26 (1)
365-377 E13.8 --- k27 Correlation coefficient for scale k27 (1)
379-391 E13.8 --- k28 Correlation coefficient for scale k28 (1)
393-405 E13.8 --- k29 Correlation coefficient for scale k29 (1)
407-419 E13.8 --- k30 Correlation coefficient for scale k30 (1)
421-433 E13.8 --- k31 Correlation coefficient for scale k31 (1)
435-447 E13.8 --- k32 Correlation coefficient for scale k32 (1)
449-461 E13.8 --- k33 ? Correlation coefficient for scale k33 (1) (2)
463-475 E13.8 --- k34 ? Correlation coefficient for scale k34 (1) (2)
477-489 E13.8 --- k35 ? Correlation coefficient for scale k35 (1) (2)
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Note (1): kN for table[45]bJ.dat:
Coefficient for Scale value in table[45]a.dat at nk=N and nz=J.
Note (2): only for cct4b*.dat.
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Acknowledgements:
Nathalie Palanque-Delabrouille, nathalie.palanque-delabrouille(at)cea.fr
(End) Patricia Vannier [CDS] 12-Sep-2013