2005ApJ...618..592S

Query : 2005ApJ...618..592S

2005ApJ...618..592S - Astrophys. J., 618, 592-600 (2005/January-2)

Predicting QSO continua in the Lyα forest.

SUZUKI N., TYTLER D., KIRKMAN D., O'MEARA J.M. and LUBIN D.

Abstract (from CDS):

We present a method to make predictions with sets of correlated data values, in this case QSO flux spectra. We predict the continuum in the Lyα forest of a QSO, from 1020 to 1216 Å, using the spectrum of that QSO from 1216 to 1600 Å. We find correlations between the unabsorbed flux in these two wavelength regions in the Hubble Space Telescope (HST) spectra of 50 QSOs. We use principal component analysis to summarize the variety of these spectra, relate the weights of the principal components for 1020-1600 Å to the weights for 1216-1600 Å, and apply this relation to make predictions. We test the method on the HST spectra and find an average absolute flux error of 9%, with a range of 3%-30%, where individual predictions are systematically too low or too high. We mention several ways in which the predictions might be improved.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Intergalactic Medium - Methods: Data Analysis - Methods: Statistical - Galaxies: Quasars: Absorption Lines - Galaxies: Quasars: Emission Lines - Techniques: Spectroscopic

Simbad objects: 53

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Number of rows : 53
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ICRF J000559.2+160949 Sy1 00 05 59.2378545384 +16 09 49.021968096   16.51 16.40     ~ 307 1
2 LEDA 1790 Sy1 00 29 13.7012449608 +13 16 03.947778264   15.70 15.41     ~ 474 0
3 87GB 004432.0+030343 Sy1 00 47 05.9186531064 +03 19 54.784830324   16.2 16.37     ~ 154 2
4 ICRF J020157.1-113233 Sy1 02 01 57.1794759192 -11 32 33.435766068   16.54 16.40 16.073   ~ 223 1
5 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
6 3C 95 Sy1 03 51 28.5673217616 -14 29 08.257870248 15.62 16.55 16.22     ~ 192 1
7 PKS 0405-123 Bla 04 07 48.4309841856 -12 11 36.659928408   15.09 14.86 14.7   ~ 531 1
8 2E 962 Sy1 04 17 16.7842972416 -05 53 45.608035560   16.24 15.94 15.7   ~ 173 1
9 QSO J0441-4313 Bla 04 41 17.3385563928 -43 13 45.488722116   16.64 16.36 16.54 16.26 ~ 111 1
10 QSO J0456-2159 Bla 04 56 08.9237717400 -21 59 09.399816312 15.76 16.16 16.10 15.9   ~ 196 1
11 QSO B0624+6907 QSO 06 30 02.5051022520 +69 05 03.913837440   14.64 14.16     ~ 97 0
12 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 625 1
13 3C 216.0 Bla 09 09 33.49714902 +42 53 46.4821036   19.98 19.42 18.220   ~ 520 1
14 4C 39.25 Bla 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1036 1
15 LEDA 2149945 Sy1 09 50 48.3803143440 +39 26 50.467298496   16.83 16.73     ~ 216 0
16 PG 0953+414 Sy1 09 56 52.3931554992 +41 15 22.211247636 14.710 15.611 15.546 15.294 14.720 ~ 472 0
17 4C 55.17 Bla 09 57 38.1839604096 +55 22 57.754950636   18.24 17.89     ~ 459 1
18 QSO B0959+6827 Bla 10 03 06.7660298016 +68 13 16.811854896   16.28 15.92 15.3   ~ 69 1
19 Ton 28 Sy1 10 04 02.6102134920 +28 55 35.329310688   16.17 15.7     ~ 192 0
20 7C 100725.89+414711.00 Sy1 10 10 27.5274498072 +41 32 39.053861232   16.72 16.67     ~ 187 1
21 [OKM2018] SWIFT J1104.8+7689 Sy1 11 04 13.8611496720 +76 58 58.194549084   15.70 15.72 15.40   ~ 564 1
22 ICRF J110715.0+162802 Sy1 11 07 15.0475336176 +16 28 02.244766584   15.91 15.70     ~ 172 1
23 LEDA 34570 Sy1 11 18 30.2894794680 +40 25 54.068810952   16.34 16.21     ~ 246 0
24 ICRF J113957.0+654749 Sy1 11 39 57.0254367168 +65 47 49.483232880   16.50 16.32     ~ 528 1
25 LB 2126 QSO 11 51 20.4599373144 +54 37 33.049962300   16.03 15.78     ~ 155 0
26 PG 1216+069 Sy1 12 19 20.9318278680 +06 38 38.467059252   15.68 15.65     ~ 302 0
27 4C -02.55 Bla 12 32 00.0159535440 -02 24 04.793069304   17.41 17.06 16.4   ~ 440 1
28 QSO B1248+401 QSO 12 50 48.3268288080 +39 51 39.458894760   16.62 16.19     ~ 139 0
29 QSO B1252+119 Bla 12 54 38.25561478 +11 41 05.8950431   16.99 16.64 16.76   ~ 284 1
30 LB 2522 Sy1 13 01 12.9250750776 +59 02 06.693816732   16.04 15.89     ~ 298 0
31 Ton 153 QSO 13 19 56.2320886176 +27 28 08.186323080   16.12 15.98     ~ 156 0
32 Ton 157 QSO 13 23 20.5544185368 +29 10 07.108804344   16.91 16.83     ~ 59 0
33 2MASS J13234951+6541480 Sy1 13 23 49.5182430360 +65 41 48.164463600   16.01 15.84     ~ 185 1
34 4C 19.44 Bla 13 57 04.4366598768 +19 19 07.371837768   16.33 16.03 15.3   ~ 472 2
35 Ton 182 Sy1 14 05 16.2178674936 +25 55 34.117540788   15.42 15.34     ~ 268 0
36 QSO J1427-1203 QSO 14 27 38.1268790904 -12 03 49.949292420   16.91 16.49 17.19   ~ 75 1
37 2MASS J14294306+4747262 Sy1 14 29 43.0739786592 +47 47 26.217623904   17.29 16.97     ~ 195 0
38 2MASS J14464593+4035057 Sy1 14 46 45.9392259288 +40 35 05.797233636   16.28 16.11     ~ 302 0
39 PG 1538+47 Sy1 15 39 34.8103136784 +47 35 31.263874908   16.01 15.81     ~ 105 1
40 PG 1543+489 Sy1 15 45 30.2358624864 +48 46 08.976390420   16.92 16.73     ~ 247 0
41 4C 23.43 Bla 16 24 39.0838297968 +23 45 12.223370412   17.91 17.47     ~ 343 1
42 6C 163718+572618 Bla 16 38 13.45629995 +57 20 23.9789828     16.90 16.94   ~ 381 1
43 ClG 1821+64 ClG 18 21 56.7276 +64 20 55.841           ~ 511 1
44 7C 1821+6419 Sy1 18 21 57.2130271440 +64 20 36.221312076   14.23 14.24     ~ 632 1
45 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     16.06 15.11   ~ 562 2
46 4C 06.69 Bla 21 48 05.45866779 +06 57 38.6041877   16.85 16.47 15.06   ~ 703 1
47 4C 31.63 BLL 22 03 14.9756830008 +31 45 38.269473228   15.85 15.58 14.33   ~ 523 1
48 QSO J2246-1206 Bla 22 46 18.23197022 -12 06 51.2775983   16.63 16.45 15.99   ~ 293 1
49 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
50 4C 11.72 BLL 22 54 10.4214226080 +11 36 38.748083760   16.02 15.82     ~ 351 1
51 QSO B2340-0339 Bla 23 42 56.6002743864 -03 22 26.269675248   16.53 16.02 16.28   ~ 91 1
52 4C 09.74 Bla 23 46 36.8384562240 +09 30 45.514903032   16.23 15.97 15.99   ~ 332 2
53 QSO J2355-3357 Bla 23 55 25.7961480408 -33 57 55.218632328   18.32 16.4 17.10   ~ 61 1

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