2011A&A...530A..50P


Query : 2011A&A...530A..50P

2011A&A...530A..50P - Astronomy and Astrophysics, volume 530A, 50-50 (2011/6-1)

A principal component analysis of quasar UV spectra at z ∼ 3.

PARIS I., PETITJEAN P., ROLLINDE E., AUBOURG E., BUSCA N., CHARLASSIER R., DELUBAC T., HAMILTON J.-C., LE GOFF J.-M., PALANQUE-DELABROUILLE N., PEIRANI S., PICHON C., RICH J., VARGAS-MAGANA M. and YECHE C.

Abstract (from CDS):

From a principal component analysis (PCA) of 78 z∼3 high-quality quasar spectra in the SDSS-DR7 we derive the principal components that characterize the QSO continuum over the full available wavelength range. The shape of the mean continuum is similar to that measured at low-z (z∼1), but the equivalent width of the emission lines is larger at low redshift. We calculate the correlation between fluxes at different wavelengths and find that the emission line fluxes in the red part of the spectrum are correlated with those in the blue part. We construct a projection matrix to predict the continuum in the Lyman-α forest from the red part of the spectrum. We apply this matrix to quasars in the SDSS-DR7 to derive the evolution with redshift of the mean flux in the Lyman-α forest caused by the absorption by the intergalactic neutral hydrogen. A change in the evolution of the mean flux is apparent around z∼3 as a steeper decrease of the mean flux at higher redshifts. The same evolution is found when the continuum is estimated from the extrapolation of a power-law continuum fitted in the red part of the quasar spectrum if a correction derived from simple simulations is applied. Our findings are consistent with previous determinations using high spectral resolution data. We provide the PCA eigenvectors over the wavelength range 1020-2000Å and the distribution of their weights that can be used to simulate QSO mock spectra.

Abstract Copyright:

Journal keyword(s): methods: numerical - intergalactic medium - quasars: absorption lines - quasars: emission lines

VizieR on-line data: <Available at CDS (J/A+A/530/A50): xi.dat zeta.dat proj.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 78

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Number of rows : 78
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J00331134-1710414 QSO 00 33 11.3417558351 -17 10 41.519248182           ~ 6 0
2 [SSO2007] 010.374223+24.283898 QSO 00 41 29.8085751171 +24 17 02.120091684           ~ 10 0
3 QSO B0119+1432 QSO 01 21 56.0330317036 +14 48 23.897090525   17.57 17.37     ~ 46 0
4 [GCS90] 89 QSO 01 23 05.5805463552 +06 30 47.174628141           ~ 11 0
5 SDSS J013829.75+224558.8 QSO 01 38 29.7632462486 +22 45 58.857251341           ~ 12 0
6 QSO B0207-0019 QSO 02 09 50.7146360498 -00 05 06.459317612   17.45 17.21     ~ 125 0
7 [VV2006] J031522.1-080043 QSO 03 15 22.0926373035 -08 00 43.695823592   18.81 18.48     ~ 20 0
8 2XMM J074313.8+284441 QSO 07 43 13.8669093005 +28 44 42.347322497           ~ 14 0
9 [VV2000] J075326.1+403038 QSO 07 53 26.1239898470 +40 30 38.651280922   18.20 18.00     ~ 29 0
10 [VV2006] J075710.3+362301 QSO 07 57 10.3676129793 +36 23 01.538140485   19.08 18.82     ~ 24 0
11 [VV2006] J082257.0+070104 QSO 08 22 57.0459019877 +07 01 04.387918405   19.12 18.89     ~ 24 0
12 2MASS J08494901+2756387 QSO 08 49 48.9860707036 +27 56 38.721450862   18.43 18.24     ~ 20 0
13 SDSS J085733.39+370045.6 QSO 08 57 33.3964106961 +37 00 45.639526086           ~ 9 0
14 [VV2006] J085959.2+020520 QSO 08 59 59.1428259567 +02 05 19.755998241   18.76 18.49     ~ 25 0
15 2MASS J09042337+1309208 QSO 09 04 23.3740479717 +13 09 20.717771127   18.13 17.71     ~ 20 0
16 2MASS J09043948+2210506 QSO 09 04 39.5015792703 +22 10 50.388378687   18.72 18.51     ~ 13 0
17 [VV2006] J091546.6+054942 QSO 09 15 46.6797269317 +05 49 42.770221909   18.85 18.65     ~ 23 0
18 [VV2006] J093207.5+365745 QSO 09 32 07.4600301218 +36 57 45.528992951   18.17 17.94     ~ 25 0
19 [VV2006] J093434.7+543109 QSO 09 34 34.7434127239 +54 31 09.425258946   19.15 18.89     ~ 18 0
20 2MASS J09364349+2927138 QSO 09 36 43.5081075747 +29 27 13.666208104   18.53 18.39     ~ 28 0
21 SDSS J094152.90+621705.5 QSO 09 41 52.9070519670 +62 17 05.538454728           ~ 8 0
22 7C 0941+2608 QSO 09 44 42.3165952275 +25 54 43.286842404     18.7 17.50   ~ 73 1
23 SDSS J100808.27+285214.6 QSO 10 08 08.2622129435 +28 52 14.623300498   19.00 18.73     ~ 9 0
24 [VV2006] J101539.4+111816 QSO 10 15 39.3587314424 +11 18 15.935089580   19.01 18.75     ~ 22 0
25 LAMOST J102025.27+334633.4 QSO 10 20 25.2767978849 +33 46 33.428231570   18.71 18.39     ~ 19 0
26 [VV2000] J102734.2+183428 QSO 10 27 34.1319567383 +18 34 27.608207385   18.14 17.88     ~ 21 0
27 2MASS J10280775+1729571 QSO 10 28 07.7455084752 +17 29 56.835698121           ~ 8 0
28 LBQS 1025-0030 QSO 10 28 32.0933844576 -00 46 07.041934954   18.70 18.37     ~ 37 0
29 SDSS J103000.37+440010.7 QSO 10 30 00.3739223716 +44 00 10.724558943           ~ 8 0
30 [VV2006] J103249.9+054118 QSO 10 32 49.8839870372 +05 41 18.384876824   17.67 17.42     ~ 27 0
31 SDSS J103928.63+253345.4 QSO 10 39 28.6244385749 +25 33 45.405432109   19.13 18.94     ~ 10 0
32 [VV2006] J104253.4-001301 QSO 10 42 53.4420314544 -00 13 00.829475291   19.33 19.06     ~ 24 0
33 2MASS J10523635+2539561 QSO 10 52 36.3404346341 +25 39 56.135366960   18.30 18.05     ~ 14 0
34 [VV2006] J111033.4+113300 QSO 11 10 33.3908320557 +11 33 00.015384467   18.78 18.47     ~ 22 0
35 QSO B1107+4847 QSO 11 10 38.6373081925 +48 31 15.693241688   17.09 16.87     ~ 77 0
36 [VV2000] J112858.0+362248 QSO 11 28 57.8469177672 +36 22 50.207254322   18.18 17.92     ~ 27 0
37 SDSS J113429.70-011153.6 QSO 11 34 29.7103753366 -01 11 53.688410120           ~ 10 0
38 [VV2006] J113559.4+422004 QSO 11 35 59.4171049003 +42 20 04.474794080   19.06 18.80     ~ 23 0
39 [VV2006] J114218.9+572824 QSO 11 42 18.8662519542 +57 28 24.462995437   19.34 19.13     ~ 18 0
40 QSO B1157+3143 QSO 12 00 06.2494598212 +31 26 30.839054589   16.76 16.47     ~ 61 0
41 SDSS J120322.71+403310.1 QSO 12 03 22.7126138797 +40 33 10.161118256           ~ 11 0
42 [VV2000] J120331.2+152256 QSO 12 03 31.2905982430 +15 22 54.708165921   17.14 16.92     ~ 27 0
43 SDSS J120753.79+325747.3 QSO 12 07 53.7976995494 +32 57 47.353742320   19.35 19.05     ~ 12 0
44 LAMOST J121723.67+254910.6 QSO 12 17 23.6744339678 +25 49 10.495236695   18.99 18.76     ~ 12 0
45 [VV2006] J123503.1+441118 QSO 12 35 03.0149945439 +44 11 18.171709648   18.99 18.71     ~ 18 0
46 [VV96] J123549.4+591028 QSO 12 35 49.4624610031 +59 10 27.061004102   17.41 17.21     ~ 34 0
47 2MASS J12465281-0813127 QSO 12 46 52.8159961813 -08 13 12.882175789           ~ 6 0
48 SDSS J124754.78+492758.2 QSO 12 47 54.7843986778 +49 27 58.269231549           ~ 11 0
49 SDSS J125251.95+202405.0 QSO 12 52 51.9615756992 +20 24 05.100610491   19.21 19.01     ~ 10 0
50 QSO J1254+3627 QSO 12 54 19.0683897828 +36 27 50.406207214   18.96 18.70     ~ 27 0
51 SDSS J125708.23+191857.2 QSO 12 57 08.2280613545 +19 18 57.258956833           ~ 8 0
52 2MASS J13033725+1949271 QSO 13 03 37.2184165028 +19 49 26.808911105           ~ 10 0
53 SDSS J130554.81+184904.9 QSO 13 05 54.8180347761 +18 49 04.918794162   18.71 18.43     ~ 11 0
54 LBQS 1308-0214 QSO 13 11 14.9090419864 -02 30 45.563914662   18.84 18.57     ~ 34 0
55 MGC 42484 QSO 13 12 12.6063935094 +00 11 29.699399140   19.61       ~ 13 0
56 QSO B1312+275 QSO 13 14 40.1906040460 +27 14 49.545671023   19.17 18.87     ~ 14 0
57 QSO B1320+3927 BLL 13 22 55.6644835842 +39 12 07.949705839   18.04 17.68 17.38   ~ 62 1
58 2MASS J13232123+2500274 QSO 13 23 21.2452902976 +25 00 27.366013099   18.50 18.29     ~ 9 0
59 SDSS J134450.86+191843.4 QSO 13 44 50.8698929652 +19 18 43.477062273           ~ 9 0
60 [VV2000] J134811.8+281801 QSO 13 48 11.7695499418 +28 18 01.839259213   17.3       ~ 16 0
61 [VV2006] J134826.6+290623 QSO 13 48 26.6572273243 +29 06 23.050442984     19.18     ~ 13 0
62 [VV98] J135044.7+571643 QSO 13 50 44.6628880147 +57 16 42.901488089   17.89 17.61     ~ 32 0
63 SDSS J135225.88+293830.4 QSO 13 52 25.8861410052 +29 38 30.516977979   18.87 18.63     ~ 11 0
64 SDSS J141442.96+193523.5 QSO 14 14 42.9690281118 +19 35 23.576793519   18.83 18.53     ~ 9 0
65 SDSS J142807.87+162634.3 QSO 14 28 07.8679173763 +16 26 34.307737974   18.79 18.57     ~ 10 0
66 7C 1427+2621 BLL 14 29 50.9100654585 +26 07 50.319612536   18.82 18.58     ~ 26 1
67 [VV2006] J143455.4+035030 QSO 14 34 55.3821771408 +03 50 30.856844117   18.65 18.42     ~ 24 0
68 2MASS J14382352+0831283 QSO 14 38 23.5181456437 +08 31 28.604398736   18.85 18.59     ~ 16 0
69 QSO J1439+2954 QSO 14 39 12.3388032775 +29 54 48.059282289   18.13 17.91     ~ 27 0
70 [VV2006] J152119.7-004818 QSO 15 21 19.6845874411 -00 48 18.759321799   18.11 17.81     ~ 28 0
71 2MASS J16044147+1645384 QSO 16 04 41.4693069469 +16 45 38.333409658   17.37 17.07     ~ 16 0
72 2MASS J16084390+0715087 QSO 16 08 43.9041265384 +07 15 08.642631101   17.29 17.01     ~ 29 0
73 [VV2006] J162331.2+481842 QSO 16 23 31.1484160908 +48 18 42.121675716   18.32 17.99     ~ 21 0
74 SDSS J163842.52+360213.8 QSO 16 38 42.5250984671 +36 02 13.840052664   19.48 19.24     ~ 14 0
75 SDSS J170144.31+284234.2 QSO 17 01 44.3171313256 +28 42 34.249152248           ~ 11 0
76 [VV2006] J221936.3+002434 QSO 22 19 36.3725082813 +00 24 34.055611051 19.9068 19.1434 18.9825 18.7783 18.7170 ~ 21 0
77 SDSS J223927.69+230018.0 QSO 22 39 27.6919167213 +23 00 18.029751776           ~ 10 0
78 SDSS J224154.38+000102.2 QSO 22 41 54.3842354408 +00 01 02.171532490   19.27 18.99     ~ 17 0

    Equat.    Gal    SGal    Ecl

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2021.07.26-03:30:58

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