2018A&A...611A..97P


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.25CET18:15:25

2018A&A...611A..97P - Astronomy and Astrophysics, volume 611A, 97-97 (2018/3-1)

Deep learning approach for classifying, detecting and predicting photometric redshifts of quasars in the Sloan Digital Sky Survey stripe 82.

PASQUET-ITAM J. and PASQUET J.

Abstract (from CDS):

We have applied a convolutional neural network (CNN) to classify and detect quasars in the Sloan Digital Sky Survey Stripe 82 and also to predict the photometric redshifts of quasars. The network takes the variability of objects into account by converting light curves into images. The width of the images, noted w, corresponds to the five magnitudes ugriz and the height of the images, noted h, represents the date of the observation. The CNN provides good results since its precision is 0.988 for a recall of 0.90, compared to a precision of 0.985 for the same recall with a random forest classifier. Moreover 175 new quasar candidates are found with the CNN considering a fixed recall of 0.97. The combination of probabilities given by the CNN and the random forest makes good performance even better with a precision of 0.99 for a recall of 0.90. For the redshift predictions, the CNN presents excellent results which are higher than those obtained with a feature extraction step and different classifiers (a K-nearest-neighbors, a support vector machine, a random forest and a Gaussian process classifier). Indeed, the accuracy of the CNN within |Δz|<0.1 can reach 78.09%, within |Δz|<0.2 reaches 86.15%, within |Δz|<0.3 reaches 91.2% and the value of root mean square (rms) is 0.359. The performance of the KNN decreases for the three |Δz| regions, since within the accuracy of |Δz|<0.1, |Δz|<0.2, and |Δz|<0.3 is 73.72%, 82.46%, and 90.09% respectively, and the value of rms amounts to 0.395. So the CNN successfully reduces the dispersion and the catastrophic redshifts of quasars. This new method is very promising for the future of big databases such as the Large Synoptic Survey Telescope.

Abstract Copyright: © ESO 2018

Journal keyword(s): methods: data analysis - techniques: photometric - techniques: image processing - quasars: general - surveys

VizieR on-line data: <Available at CDS (J/A+A/611/A97): qso.dat>

Simbad objects: 176

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Number of rows : 176

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 SDSS J000005.01-003109.9 QSO 00 00 05.01192 -00 31 09.9732           ~ 1 0
2 SDSS J000046.43+000402.0 QSO 00 00 46.43928 +00 04 02.0352           ~ 1 0
3 SDSS J000051.04+004213.3 QSO 00 00 51.04008 +00 42 13.3272           ~ 1 0
4 SDSS J001410.21-005102.2 QSO 00 14 10.21632 -00 51 02.2392           ~ 1 0
5 SDSS J001622.96+010506.4 QSO 00 16 22.96032 +01 05 06.4932           ~ 1 0
6 SDSS J001636.59+002310.4 QSO 00 16 36.59664 +00 23 10.4352           ~ 1 0
7 SDSS J001802.71+000924.4 QSO 00 18 02.71728 +00 09 24.4404           ~ 1 0
8 SDSS J001929.56-011449.7 QSO 00 19 29.56704 -01 14 49.7148           ~ 1 0
9 SDSS J002049.97-011518.6 QSO 00 20 49.97784 -01 15 18.6444           ~ 2 0
10 SDSS J002226.89+004502.8 QSO 00 22 26.89464 +00 45 02.8296           ~ 1 0
11 SDSS J002526.36+010001.9 QSO 00 25 26.36592 +01 00 01.9476           ~ 1 0
12 SDSS J003001.46-004710.0 QSO 00 30 01.466 -00 47 10.08           ~ 2 0
13 SDSS J003048.33-002849.8 QSO 00 30 48.33744 -00 28 49.8468           ~ 1 0
14 6dFGS gJ003103.2-004632 QSO 00 31 03.232 -00 46 32.39   16.12   15.06   ~ 11 0
15 SDSS J003124.90-000045.5 QSO 00 31 24.90504 -00 00 45.5148           ~ 1 0
16 SDSS J003656.06-011543.9 QSO 00 36 56.06328 -01 15 43.8984           ~ 2 0
17 SDSS J003859.48+003240.4 QSO 00 38 59.48328 +00 32 40.4952           ~ 1 0
18 SDSS J004226.16+011542.6 QSO 00 42 26.16000 +01 15 42.6780           ~ 2 0
19 SDSS J005249.79+001540.3 QSO 00 52 49.79088 +00 15 40.3848           ~ 1 0
20 SDSS J005321.49+011455.1 QSO 00 53 21.49920 +01 14 55.1472           ~ 1 0
21 2SLAQ J010105.90-005729.6 QSO 01 01 05.9061138820 -00 57 29.778148591           ~ 3 0
22 SDSS J010400.03+010741.3 WD* 01 04 00.0308380177 +01 07 41.414091470           DC 2 1
23 SDSS J011640.23-004712.6 QSO 01 16 40.239 -00 47 12.63           ~ 2 0
24 SDSS J011654.86+003502.1 QSO 01 16 54.86040 +00 35 02.1444           ~ 1 0
25 SDSS J012242.79+003738.6 QSO 01 22 42.79464 +00 37 38.6544           ~ 1 0
26 SDSS J012503.37+001529.6 QSO 01 25 03.37776 +00 15 29.6496           ~ 1 0
27 SDSS J012627.77+005855.4 QSO 01 26 27.77808 +00 58 55.4664           ~ 1 0
28 SDSS J013135.39+011353.5 QSO 01 31 35.396 +01 13 53.58           ~ 2 0
29 SDSS J013427.60-011543.9 QSO 01 34 27.60384 -01 15 43.8984           ~ 2 0
30 SDSS J013450.88-002000.8 QSO 01 34 50.88360 -00 20 00.8916           ~ 1 0
31 LEDA 1132169 QSO 01 35 11.82528 -00 53 20.6664           ~ 2 0
32 SDSS J013832.10+011541.6 QSO 01 38 32.10864 +01 15 41.6592           ~ 1 0
33 SDSS J013845.48+010958.2 QSO 01 38 45.48552 +01 09 58.2696           ~ 1 0
34 SDSS J014346.76+003036.1 QSO 01 43 46.76568 +00 30 36.1548           ~ 1 0
35 SDSS J014635.98+004118.2 QSO 01 46 35.98944 +00 41 18.2400           ~ 1 0
36 SDSS J015033.54-001746.5 QSO 01 50 33.54192 -00 17 46.5252           ~ 1 0
37 SDSS J015112.66-011405.9 QSO 01 51 12.66432 -01 14 05.9496           ~ 1 0
38 2SLAQ J015505.58+000310.2 QSO 01 55 05.5863184628 +00 03 10.305088994           ~ 2 0
39 SDSS J015919.27+010816.7 QSO 01 59 19.27080 +01 08 16.7244           ~ 1 0
40 SDSS J015941.39-003100.6 QSO 01 59 41.39304 -00 31 00.6312           ~ 1 0
41 SDSS J020146.49+010833.9 QSO 02 01 46.49880 +01 08 33.9252           ~ 1 0
42 SDSS J020450.60+003617.3 QSO 02 04 50.60496 +00 36 17.3448           ~ 1 0
43 SDSS J020712.89+005915.3 QSO 02 07 12.899 +00 59 15.39           ~ 2 0
44 SDSS J021858.35-001340.5 QSO 02 18 58.35840 -00 13 40.5516           ~ 1 0
45 SDSS J023004.58+004833.4 QSO 02 30 04.58568 +00 48 33.4512           ~ 1 0
46 SDSS J023135.09+003423.3 QSO 02 31 35.09664 +00 34 23.3940           ~ 1 0
47 SDSS J023808.30-003817.7 QSO 02 38 08.304 -00 38 17.76           ~ 2 0
48 SDSS J024400.23+002217.0 QSO 02 44 00.23088 +00 22 17.0796           ~ 1 0
49 SDSS J024530.82-011555.8 QSO 02 45 30.82200 -01 15 55.8324           ~ 2 0
50 Gaia DR2 2497764348684940160 QSO 02 46 24.7459125149 -00 30 16.832413743           ~ 1 0
51 Gaia DR2 2497764348685496320 QSO 02 46 25.6893252442 -00 30 03.026015613           ~ 1 0
52 SDSS J024702.70+011529.4 QSO 02 47 02.704 +01 15 29.55           ~ 3 0
53 SDSS J024836.31+011546.6 QSO 02 48 36.30960 +01 15 46.6524           ~ 1 0
54 SDSS J024935.37-004328.9 QSO 02 49 35.37816 -00 43 28.9884           ~ 1 0
55 SDSS J025844.09+004725.1 QSO 02 58 44.0896540586 +00 47 25.147808624           sdA 2 0
56 SDSS J030354.11-002047.5 QSO 03 03 54.11568 -00 20 47.5080           ~ 1 0
57 SDSS J030529.12-001740.7 QSO 03 05 29.12088 -00 17 40.7004           ~ 1 0
58 SDSS J030742.77+011501.4 QSO 03 07 42.77208 +01 15 01.4184           ~ 1 0
59 SDSS J031215.17-005803.7 QSO 03 12 15.17208 -00 58 03.7956           ~ 1 0
60 SDSS J031246.62-001939.8 QSO 03 12 46.62168 -00 19 39.8856           ~ 1 0
61 SDSS J031757.06-001013.2 QSO 03 17 57.06456 -00 10 13.2852           ~ 1 0
62 SDSS J032110.91-002425.7 QSO 03 21 10.90992 -00 24 25.7652           ~ 1 0
63 SDSS J032616.54+003520.4 QSO 03 26 16.54416 +00 35 20.4108           ~ 1 0
64 Gaia DR2 3269689505010995968 QSO 03 43 01.7505579041 +00 26 49.807970083           ~ 1 0
65 SDSS J035346.90-004531.5 QSO 03 53 46.90608 -00 45 31.4964           ~ 1 0
66 SDSS J040027.28+002033.6 QSO 04 00 27.28584 +00 20 33.6552           ~ 1 0
67 SDSS J040213.11+011047.8 QSO 04 02 13.10976 +01 10 47.8704           ~ 1 0
68 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5979 0
69 Gaia DR2 4237157654675123072 QSO 19 55 58.7034070604 +00 12 16.912617687           ~ 1 0
70 SDSS J200143.74+004918.4 QSO 20 01 43.74360 +00 49 18.4656           ~ 1 0
71 Gaia DR2 4236186064351260160 QSO 20 02 49.8428756490 -00 17 47.895765845           ~ 1 0
72 Gaia DR2 4236125453771849472 QSO 20 04 57.1526334767 -00 24 54.890181543           ~ 1 0
73 SDSS J200554.74+004210.7 QSO 20 05 54.74520 +00 42 10.7928           ~ 1 0
74 Gaia DR2 4236220973845819008 QSO 20 08 31.1378529334 -00 55 04.898431938           ~ 1 0
75 SDSS J201335.11+004847.7 QSO 20 13 35.11608 +00 48 47.7864           ~ 1 0
76 SDSS J201348.25+002235.0 QSO 20 13 48.25344 +00 22 35.0292           ~ 1 0
77 Gaia DR2 4242518461054207872 QSO 20 13 51.6478494984 +00 50 23.034598118           ~ 1 0
78 SDSS J201407.40-003037.4 QSO 20 14 07.40856 -00 30 37.4544           ~ 1 0
79 SDSS J201609.84-011131.6 QSO 20 16 09.84120 -01 11 31.6140           ~ 1 0
80 SDSS J201704.84+005652.2 QSO 20 17 04.84104 +00 56 52.2888           ~ 1 0
81 SDSS J201706.33+001133.9 QSO 20 17 06.33336 +00 11 33.9936           ~ 1 0
82 Gaia DR2 4230520315291443328 QSO 20 18 44.5881102727 +00 38 17.221535578           ~ 1 0
83 SDSS J201857.59-010702.9 QSO 20 18 57.59568 -01 07 02.9388           ~ 1 0
84 SDSS J201902.83+005344.3 QSO 20 19 02.83296 +00 53 44.3544           ~ 1 0
85 SDSS J201914.02-005346.7 QSO 20 19 14.02824 -00 53 46.7808           ~ 1 0
86 SDSS J202002.98+003201.6 QSO 20 20 02.98680 +00 32 01.6692           ~ 1 0
87 Gaia DR2 4230538525954858624 QSO 20 20 16.4285943046 +00 43 23.597839697           ~ 1 0
88 SDSS J202038.89+003137.5 QSO 20 20 38.89104 +00 31 37.5528           ~ 1 0
89 SDSS J202104.13+002331.2 QSO 20 21 04.13160 +00 23 31.2324           ~ 1 0
90 SDSS J202147.24-011505.3 QSO 20 21 47.24328 -01 15 05.3136           ~ 1 0
91 SDSS J202225.54+003844.7 QSO 20 22 25.54032 +00 38 44.7324           ~ 1 0
92 SDSS J202251.76-011243.6 QSO 20 22 51.76632 -01 12 43.6536           ~ 1 0
93 SDSS J202304.87-000055.3 QSO 20 23 04.87464 -00 00 55.3176           ~ 1 0
94 SDSS J202515.20+003749.3 QSO 20 25 15.20448 +00 37 49.3392           ~ 1 0
95 SDSS J202531.29+002026.7 QSO 20 25 31.29408 +00 20 26.7288           ~ 1 0
96 SDSS J202712.96+003609.3 QSO 20 27 12.95976 +00 36 09.3132           ~ 1 0
97 SDSS J202722.48+005121.2 QSO 20 27 22.48104 +00 51 21.2148           ~ 1 0
98 SDSS J202727.25-001632.7 QSO 20 27 27.25680 -00 16 32.7072           ~ 1 0
99 SDSS J202728.27-003852.3 QSO 20 27 28.27872 -00 38 52.3608           ~ 1 0
100 SDSS J202807.67+011210.7 QSO 20 28 07.67928 +01 12 10.7892           ~ 1 0
101 SDSS J202905.80+010746.4 QSO 20 29 05.80272 +01 07 46.4664           ~ 1 0
102 SDSS J202906.80+005453.5 QSO 20 29 06.80496 +00 54 53.5608           ~ 1 0
103 SDSS J203033.79+004854.3 QSO 20 30 33.79440 +00 48 54.3024           ~ 1 0
104 SDSS J203157.86-010315.4 QSO 20 31 57.86112 -01 03 15.4044           ~ 1 0
105 SDSS J203240.54-010747.0 QSO 20 32 40.54704 -01 07 47.0244           ~ 1 0
106 SDSS J203306.58+005500.8 QSO 20 33 06.58872 +00 55 00.8832           ~ 1 0
107 SDSS J203405.75-000840.1 QSO 20 34 05.75712 -00 08 40.1352           ~ 1 0
108 SDSS J203406.08+001352.4 QSO 20 34 06.08688 +00 13 52.4748           ~ 1 0
109 SDSS J203515.61+002421.5 QSO 20 35 15.61008 +00 24 21.5892           ~ 1 0
110 SDSS J203517.01+003455.8 QSO 20 35 17.01696 +00 34 55.8084           ~ 1 0
111 SDSS J203523.34+005752.3 QSO 20 35 23.34312 +00 57 52.3512           ~ 1 0
112 SDSS J203642.48+003641.3 QSO 20 36 42.48864 +00 36 41.3820           ~ 1 0
113 SDSS J203839.28+001423.2 QSO 20 38 39.28920 +00 14 23.2152           ~ 1 0
114 SDSS J204752.22+010502.6 QSO 20 47 52.22088 +01 05 02.6916           ~ 1 0
115 SDSS J205248.15+002426.7 QSO 20 52 48.15576 +00 24 26.7408           ~ 1 0
116 SDSS J205324.97+001300.1 QSO 20 53 24.97464 +00 13 00.1668           ~ 1 0
117 SDSS J205340.28+001611.6 QSO 20 53 40.28376 +00 16 11.6148           ~ 1 0
118 SDSS J205538.09+011100.6 QSO 20 55 38.09208 +01 11 00.6684           ~ 1 0
119 Gaia DR2 4227463574182155648 QSO 20 56 33.6990120616 +00 25 13.945932255           ~ 1 0
120 SDSS J205758.23-001045.0 QSO 20 57 58.23744 -00 10 45.0300           ~ 1 0
121 SDSS J210352.19-005157.7 QSO 21 03 52.19568 -00 51 57.7296           ~ 1 0
122 SDSS J210452.38-000842.8 QSO 21 04 52.38744 -00 08 42.8424           ~ 1 0
123 SDSS J210745.09-011552.4 QSO 21 07 45.09648 -01 15 52.4772           ~ 1 0
124 SDSS J211157.40-011543.6 QSO 21 11 57.40056 -01 15 43.6536           ~ 1 0
125 SDSS J211558.07+003919.4 QSO 21 15 58.07304 +00 39 19.4112           ~ 1 0
126 SDSS J211810.79-011537.0 QSO 21 18 10.79472 -01 15 37.0296           ~ 1 0
127 SDSS J211901.15+005516.9 QSO 21 19 01.15728 +00 55 16.9176           ~ 1 0
128 SDSS J212248.64+003214.2 QSO 21 22 48.64752 +00 32 14.2224           ~ 1 0
129 Gaia DR2 2691081990614268416 QSO 21 26 24.6560292971 +01 03 07.519483521           ~ 1 0
130 SDSS J213133.70+005804.9 QSO 21 31 33.70584 +00 58 04.9512           ~ 1 0
131 SDSS J213303.99-011356.0 QSO 21 33 03.99168 -01 13 56.0352           ~ 1 0
132 SDSS J213437.24-001109.2 QSO 21 34 37.24296 -00 11 09.2796           ~ 1 0
133 SDSS J213859.12+004943.6 QSO 21 38 59.12232 +00 49 43.6728           ~ 1 0
134 Gaia DR2 2693315545407045376 QSO 21 46 50.3937635761 +00 51 34.553207442           ~ 1 0
135 SDSS J214803.74-001153.6 QSO 21 48 03.74640 -00 11 53.5992           ~ 1 0
136 SDSS J214804.76+002604.6 QSO 21 48 04.76304 +00 26 04.6356           ~ 1 0
137 SDSS J214837.67+003250.2 dS* 21 48 37.6792802830 +00 32 50.229527492           ~ 2 0
138 SDSS J215518.03-005433.3 QSO 21 55 18.03000 -00 54 33.3396           ~ 1 0
139 SDSS J215947.85-003555.2 QSO 21 59 47.84952 -00 35 55.2048           ~ 1 0
140 SDSS J220248.48+010554.0 QSO 22 02 48.48672 +01 05 54.0276           ~ 1 0
141 SDSS J220817.49-003602.2 QSO 22 08 17.49168 -00 36 02.2860           ~ 1 0
142 NGC 7215 QSO 22 08 34.482 +00 30 42.11   14.90       ~ 16 1
143 SDSS J221136.58-010130.4 QSO 22 11 36.58104 -01 01 30.4356           ~ 1 0
144 SDSS J221248.14+011536.9 Sy1 22 12 48.1384669948 +01 15 36.922484693           ~ 6 0
145 SDSS J222100.30+011238.8 QSO 22 21 00.30096 +01 12 38.8152           ~ 1 0
146 SDSS J222110.47+000651.7 QSO 22 21 10.47000 +00 06 51.7104           ~ 1 0
147 SDSS J222606.60+005106.4 QSO 22 26 06.600 +00 51 06.46           ~ 2 0
148 SDSS J222716.69+010830.8 QSO 22 27 16.6946342683 +01 08 30.828808975           ~ 2 0
149 SDSS J223611.68+004230.9 QSO 22 36 11.68368 +00 42 30.9744           ~ 1 0
150 SDSS J223706.98-000229.5 QSO 22 37 06.98928 -00 02 29.5620           ~ 1 0
151 SDSS J224042.99-000954.5 QSO 22 40 42.99288 -00 09 54.5508           ~ 1 0
152 SDSS J224519.91+000703.0 QSO 22 45 19.9092942695 +00 07 03.082622519           sdA 2 0
153 GALEX 2471880397620775284 QSO 22 47 36.876 +01 00 38.74   19.6   19.4   ~ 2 0
154 SDSS J225409.36-001159.5 QSO 22 54 09.36456 -00 11 59.5248           ~ 1 0
155 SDSS J225409.37-005908.3 QSO 22 54 09.37680 -00 59 08.3364           ~ 1 0
156 SDSS J225820.74+005913.7 QSO 22 58 20.74128 +00 59 13.7004           ~ 1 0
157 SDSS J225925.61-011539.7 QSO 22 59 25.6149652075 -01 15 39.746526726           ~ 5 0
158 SDSS J225936.29+002336.5 QSO 22 59 36.29760 +00 23 36.5568           ~ 1 0
159 SDSS J230547.47+005636.2 QSO 23 05 47.47920 +00 56 36.2904           ~ 1 0
160 SDSS J230558.83+011549.3 QSO 23 05 58.8394736329 +01 15 49.357084521   19.65 19.32     ~ 10 0
161 [VV2006] J230751.2+011545 QSO 23 07 51.2232145423 +01 15 45.920978298   19.5 20.24 19.3   ~ 18 0
162 SDSSCGB 28896.3 QSO 23 08 05.522 +00 34 19.03           ~ 3 0
163 SDSS J231140.14+004517.5 QSO 23 11 40.14024 +00 45 17.5608           ~ 1 0
164 SDSS J231214.36-000110.2 QSO 23 12 14.36184 -00 01 10.2396           ~ 1 0
165 SDSS J231332.19-010746.2 QSO 23 13 32.1917978911 -01 07 46.204737344           ~ 2 0
166 SDSS J232008.35-000635.9 QSO 23 20 08.35488 -00 06 35.9136           ~ 1 0
167 GALEX 2417133514650554873 QSO 23 23 10.1960050562 -01 15 42.763398196   18.9   19.1   ~ 2 0
168 2SLAQ J232539.22+004507.2 QSO 23 25 39.229 +00 45 07.24           ~ 12 0
169 SDSS J232740.23+011540.6 Sy1 23 27 40.2350884963 +01 15 40.586224905   20.07 19.93     ~ 12 0
170 SDSS J233033.80-000252.9 QSO 23 30 33.80616 -00 02 52.9404           ~ 1 0
171 SDSS J233626.95-011551.1 QSO 23 36 26.95608 -01 15 51.1524           ~ 1 0
172 SDSS J233936.91-005203.0 QSO 23 39 36.91944 -00 52 03.0720           ~ 1 0
173 2SLAQ J234452.01-005130.0 QSO 23 44 52.017 -00 51 30.05           ~ 2 0
174 SDSS J234515.66-000526.4 QSO 23 45 15.6699919781 -00 05 26.467201280           ~ 3 0
175 SDSS J235546.81+004900.4 QSO 23 55 46.81056 +00 49 00.4512           ~ 1 0
176 SDSS J235858.68+011541.8 QSO 23 58 58.68528 +01 15 41.8932           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.02.25-18:15:25

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