1998A&A...332..459G


Query : 1998A&A...332..459G

1998A&A...332..459G - Astronomy and Astrophysics, volume 332, 459-478 (1998/4-2)

The ESO-Sculptor Survey: spectral classification of galaxies with z ≲ 0.5.

GALAZ G. and DE LAPPARENT V.

Abstract (from CDS):

Using the ESO-Sculptor galaxy redshift survey data (ESS), we have extensively tested the Principal Components Analysis (PCA) method to perform the spectral classification of galaxies with z≲0.5. This method allows us to classify all galaxies in an ordered and continuous spectral sequence, which is strongly correlated with the morphological type. The PCA allows to quantify the systematic physical properties of the galaxies in the sample, like the different stellar contributions to the observed light as well as the stellar formation history. We also examine the influence of the emission lines, and the signal-to-noise ratio of the data. This analysis shows that the emission lines play a significant role in the spectral classification, by tracing the activity and abnormal spectral features of the observed sample. The PCA also provides a powerful tool to filter the noise which is carried by the ESS spectra. By comparison of the ESS PCA spectral sequence with that for a selected sample of Kennicutt galaxies (Kennicutt 1992ApJS...79..255K, 1992ApJ...388..310K), we find that the ESS sample contains 26% of E/S0, 71% of Sabc and 3% of Sm/Irr. The type fractions for the ESS show no significant changes in the redshift interval z ∼0.1-0.5, and are comparable to those found in other galaxy surveys at intermediate redshift. The PCA can be used independently from any set of synthetic templates, providing a completely objective and unsupervised method to classify spectra. We compare the classification of the ESS sample given by the PCA, with a χ2 test between the ESS sample and galaxy templates from Kennicutt (Kennicutt, 1992ApJS...79..255K), and obtain results in good agreement. The PCA results are also in agreement with the visual morphological classification carried out for the 35 brightest galaxies in the survey.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: fundamental parameters - surveys - galaxies: stellar content - methods: data analysis - methods: statistical

Nomenclature: Table 7: [GD98] 7-NN (Nos 7-1 to 7-38). Table 8: [GD98] 8-N (Nos 8-1 to 8-9)

Simbad objects: 72

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Number of rows : 72
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CD-34 239 PM* 00 41 30.4739854200 -33 37 32.030888686 13.138 11.969 10.525 9.619 8.741 K9V 103 0
2 Feige 21 * 02 17 21.8369134704 +04 14 23.750485620   13.7 13.68     A3 5 0
3 NGC 1357 GiG 03 33 17.0545498128 -13 39 50.970066984   12.44   11.8 11.3 ~ 140 0
4 NGC 1832 G 05 12 03.3433348776 -15 41 16.021694220   12.2   11.07 11.8 ~ 230 1
5 NGC 2276 IG 07 27 14.485 +85 45 16.20   12.3       ~ 359 0
6 NGC 2775 G 09 10 20.1334093488 +07 02 16.874157048   11.417 10.481 9.920 8.994 ~ 340 0
7 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1050 3
8 NGC 3147 Sy2 10 16 53.6388580752 +73 24 02.641798224   11.43 10.61     ~ 445 2
9 NGC 3227 GiP 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1614 1
10 NGC 3245 GiP 10 27 18.3864983136 +28 30 26.621599932   11.6       ~ 329 0
11 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 777 1
12 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1417 0
13 M 65 GiP 11 18 55.9084654776 +13 05 32.300703672   9.6       ~ 426 1
14 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1262 4
15 NGC 3941 Sy2 11 52 55.3609498656 +36 59 10.716212904   11.45 11.62 9.97   ~ 235 0
16 NGC 4262 GiG 12 19 30.5694336288 +14 52 39.517143276 13.00 12.49 11.55     ~ 344 1
17 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1071 1
18 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 2022 2
19 NGC 4485 GiP 12 30 31.113 +41 42 04.22 12.10 12.42 11.93 11.93   ~ 266 2
20 NGC 4648 GiG 12 41 44.3891511144 +74 25 15.700353240   12.6       ~ 109 0
21 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1024 2
22 NGC 4775 GiG 12 53 45.707 -06 37 19.73   12.3   11.19 12.0 ~ 149 0
23 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 674 1
24 NGC 5248 GiG 13 37 32.0145074088 +08 53 06.496982448   11.4       ~ 479 0
25 NGC 5283 Sy2 13 41 05.7499712616 +67 40 19.967186280   14.97 14.05     ~ 238 0
26 M 102 SyG 15 06 29.561 +55 45 47.91 11.12 10.74 9.89     ~ 519 3
27 NGC 6181 GiG 16 32 20.969 +19 49 35.77   12.7       ~ 236 0
28 NGC 6217 AGN 16 32 39.2100852960 +78 11 53.487076092   14.37 13.88     ~ 290 0
29 NGC 6643 G 18 19 46.370 +74 34 06.23   11.80       ~ 295 1
30 CD-30 17706 WD* 20 10 56.8486912016 -30 13 06.627142663 11.654 12.286 12.242 12.311 12.381 DA3.1 233 0
31 [GD98] 7-32 G ~ ~           ~ 1 0
32 [GD98] 7-33 G ~ ~           ~ 1 0
33 [GD98] 7-34 G ~ ~           ~ 1 0
34 [GD98] 7-35 G ~ ~           ~ 1 0
35 [GD98] 7-36 G ~ ~           ~ 1 0
36 [GD98] 7-37 G ~ ~           ~ 1 0
37 [GD98] 7-2 G ~ ~           ~ 1 0
38 [GD98] 8-2 G ~ ~           ~ 1 0
39 [GD98] 8-3 G ~ ~           ~ 1 0
40 [GD98] 8-6 G ~ ~           ~ 1 0
41 [GD98] 8-7 G ~ ~           ~ 1 0
42 [GD98] 8-8 G ~ ~           ~ 1 0
43 [GD98] 7-38 G ~ ~           ~ 1 0
44 [GD98] 7-10 G ~ ~           ~ 1 0
45 [GD98] 7-30 G ~ ~           ~ 1 0
46 [GD98] 7-9 G ~ ~           ~ 1 0
47 [GD98] 8-5 * ~ ~           ~ 1 0
48 [GD98] 8-9 ? ~ ~           ~ 1 0
49 [GD98] 7-1 G ~ ~           ~ 1 0
50 [GD98] 7-4 G ~ ~           ~ 1 0
51 [GD98] 7-5 G ~ ~           ~ 1 0
52 [GD98] 7-6 G ~ ~           ~ 1 0
53 [GD98] 7-7 G ~ ~           ~ 1 0
54 [GD98] 7-8 G ~ ~           ~ 1 0
55 [GD98] 7-13 G ~ ~           ~ 1 0
56 [GD98] 7-14 G ~ ~           ~ 1 0
57 [GD98] 7-15 G ~ ~           ~ 1 0
58 [GD98] 7-16 G ~ ~           ~ 1 0
59 [GD98] 7-17 G ~ ~           ~ 1 0
60 [GD98] 7-18 G ~ ~           ~ 1 0
61 [GD98] 7-19 G ~ ~           ~ 1 0
62 [GD98] 7-20 G ~ ~           ~ 1 0
63 [GD98] 7-21 G ~ ~           ~ 1 0
64 [GD98] 7-22 G ~ ~           ~ 1 0
65 [GD98] 7-23 G ~ ~           ~ 1 0
66 [GD98] 7-24 G ~ ~           ~ 1 0
67 [GD98] 7-25 G ~ ~           ~ 1 0
68 [GD98] 7-26 G ~ ~           ~ 1 0
69 [GD98] 7-27 G ~ ~           ~ 1 0
70 [GD98] 7-28 G ~ ~           ~ 1 0
71 [GD98] 7-29 G ~ ~           ~ 1 0
72 [GD98] 7-31 G ~ ~           ~ 1 0

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2022.05.24-08:21:03

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