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2. The catalogue

 

The main objective of the ENACS programme was to drastically increase the number of redshifts for galaxies in rich Abell clusters. The direct goal was to construct a complete, volume-limited sample of at least 100 rich Abell clusters, for which the ENACS data, in combination with data already in the literature, would provide good kinematical data. Consequently, the main observational effort of the ENACS consisted of multi-object spectroscopy. In addition, CCD-imaging was done to calibrate the photographic photometry which formed the basis for the selection of the galaxies to be observed spectroscopically.

In Paper I we have discussed the definition of the cluster sample, and the selection of the galaxies in the direction of the clusters to be observed with Optopus. In that paper, we also described the methods employed in the determination of the redshifts, and of the magnitudes. Here we present the positions and redshifts of all 5634 ENACS galaxies, as well as the red magnitudes of 5615 ENACS galaxies, and we give the estimated errors in the redshift estimates. For the redshifts derived from absorption lines using cross-correlation with template spectra (see Paper I, and Tonry & Davis 1979), we also give the S/N-ratio of the peak in the correlation function. As shown in Paper I, this S/N-ratio allows one to estimate the reliability of the redshift. For about one-fifth of the galaxies we could estimate the redshift from emission lines, either exclusively or in addition to an absorption-line redshift. For all galaxies with clear emission lines in the spectrum, we give information about which lines were seen, and the approximate line ratios (using an excitation code) as well as on the presence or absence of features in the continuum.

 

Abell nr. tex2html_wrap_inline1425 tex2html_wrap_inline1427 R25 cz tex2html_wrap_inline1433 tex2html_wrap_inline1435 S/N tex2html_wrap_inline1439 LC EC CI
0013 44 00:12:17.38-19:57:53.316.41 39595 96 395952.39 0000
0087 42 00:40:59.51-10:08:12.017.07 16746 40 00.0016746632
0118 38 00:53:47.33-26:42:03.616.47 12367 51 123772.2312357633
0119118 00:55:06.39-01:09:44.716.48 12478 48 124784.99 0000
0151112 01:08:13.33-15:47:09.014.44 9214 51 92145.25 0000
0168100 01:13:54.35-00:17:50.316.62 32024102 320242.04 0000
0229 39 01:37:33.26-03:47:59.316.96 33322 75 333223.18 0000
0295 43 02:00:44.56-01:14:27.615.88 38505 75 385053.53 0000
0303 16 02:04:25.03-03:24:09.116.76 36618 93 366182.39 0000
0367 30 02:35:11.57-19:28:52.216.02 28018102 280182.00 0000
0380 41 02:43:15.10-26:28:36.717.23 41145117 411451.77 0000
0420 33 03:07:58.18-11:41:22.317.09 25860 47 258632.6825857503
0514111 04:47:41.41-20:53:40.017.52 32679 40 00.0032679723
0524 43 04:56:45.68-19:48:11.417.30 21955 43 218753.1622035502
0543 24 05:29:29.12-22:19:04.917.97 25487 75 254873.38 0000
0548297 05:48:33.69-25:28:39.515.15 25087 72 250873.27 0000
0754 39 09:07:19.12-09:26:21.916.05 15540 75 155402.89 0000
0957 36 10:12:06.39-00:34:53.613.28 14914 81 149142.55 0000
0978 73 10:18:58.09-06:28:28.215.28 16370 51 163704.56 0000
1069 40 10:37:59.88-08:15:10.116.33 20086 66 200863.53 0000
1809 32 13:51:08.22 05:30:58.015.35 24092 66 240923.48 0000
2040 43 15:11:05.05 07:24:46.115.39 12293 47 123394.8512247403
2048 39 15:13:24.43 04:37:52.716.44 29460 78 294602.90 0000
2052 39 15:15:09.08 07:13:16.015.40 10069 48 100694.77 0000
2353 31 21:32:45.14-01:53:17.817.41 20214 43 202163.3420212720
2354 14 21:34:05.41-15:04:06.817.87 26658 81 266583.04 0000
2361 33 21:37:17.65-14:37:17.917.48 18365 60 183654.12 0000
2362 27 21:39:16.44-14:17:57.016.23 14764 78 147642.80 0000
2383 25 21:50:31.07-21:22:15.816.94 39457 87 394572.62 0000
2401 30 21:56:22.94-20:29:33.616.80 27572 66 275723.65 0000
2426 36 22:12:36.77-10:30:17.616.67 29862 66 298624.02 0000
2436 19 22:19:01.40-03:10:35.816.11 17178 51 171784.73 0000
2480 18 22:44:07.60-17:57:23.016.50 8670 40 00.00 8670641
2500 36 22:51:46.38-25:40:06.217.30 27087 66 270873.82 0000
2502 2 22:53:39.33-16:50:37.813.44 2919 40 00.00 2919633
2569 41 23:16:13.85-13:01:29.216.72 24348 57 243484.35 0000
2644 35 23:38:43.70-00:14:25.617.70 55833 80 00.0055833100
2715 34 23:59:57.72-34:41:44.017.25 33635 84 336352.69 0000
2717 53 23:59:59.36-36:33:15.114.26 14498 66 144983.81 0000
2734116 00:10:53.59-29:11:50.217.46 19013 72 190133.18 0000
2755 36 00:16:25.52-35:25:53.916.96 34971 81 349712.77 0000
2764 24 00:19:16.81-49:28:08.016.61 48284105 482842.47 0000
2765 28 00:19:49.67-20:52:51.415.91 26586 87 265862.7617122200
2778 40 00:27:08.64-30:31:38.015.63 23530 57 235304.46 0000
2799 42 00:36:10.63-39:24:45.115.73 18886105 188861.87 0000
2800 46 00:36:52.74-25:13:28.716.66 31247 75 312473.20 0000
2819124 00:46:35.18-63:43:10.616.71 32521 56 326431.9932399311
2854 35 00:59:43.12-50:55:27.215.23 18087 54 180874.41 0000
2871 40 01:06:43.02-37:06:32.717.14 38621 87 386212.86 0000
2911 44 01:25:01.92-38:18:52.817.15 24630 66 246303.88 0000
2915 7 01:26:40.10-29:17:52.115.02 26092 75 260923.04 0000
2923 33 01:31:07.88-31:30:09.416.33 38937 78 389372.94 0000
2933 11 01:40:33.39-54:50:08.016.16 28058117 280581.69 0000
2954 24 01:55:01.39-71:29:46.517.66 66373 80 00.0066373111
3009 16 02:21:30.65-48:44:09.415.85 22301 51 223015.55 0000
3093 40 03:10:31.67-47:34:35.416.79 24805 54 248054.90 0000
3094 99 03:12:08.41-27:06:06.118.08 31926 40 00.0031926312
3108 14 03:14:06.52-47:54:40.515.91 18606 51 186065.27 0000
3111 48 03:17:27.76-45:54:26.016.82 43683102 436832.38 0000
3112102 03:18:25.68-44:17:02.316.93 39569108 395691.91 0000
3122119 03:21:39.91-41:33:09.215.68 20067 54 200674.55 0000
3128193 03:32:00.91-52:40:26.516.20 17649 63 176493.72 0000
3141 22 03:35:10.44-28:10:21.216.32 31400 66 314004.08 0000
3142 38 03:36:11.47-39:59:06.516.62 31842 81 318423.14 0000
3144 3 03:34:42.83-55:21:50.916.47 13250 93 132502.18 0000
3151 43 03:39:06.74-29:00:13.117.04 26921 40 00.0026921733
3158122 03:44:23.33-53:47:12.016.34 30435117 304351.95 0000
3194 33 03:57:47.39-30:12:32.115.29 30382 62 302671.6830497502
3202 41 04:00:29.85-53:43:09.913.89 11505 55 115042.9811506203
3223110 04:08:34.14-31:00:41.214.61 21118 48 211524.9521084100
3264 11 04:31:15.08-49:22:37.016.42 31797 40 00.0031797300
3301 7 04:59:50.35-38:48:26.613.78 16093 72 160933.16 0000
3341118 05:25:20.64-31:54:35.116.29 34302 78 343023.31 0000
3354110 05:34:50.36-28:21:44.615.50 11033 40 00.0011033652
3365 35 05:47:06.84-21:48:57.316.84 27101 69 271013.39 0000
Table 1: Summary of the ENACS catalogue

 

 

Abell nr. tex2html_wrap_inline1425 tex2html_wrap_inline1427 R25 cz tex2html_wrap_inline1433 tex2html_wrap_inline1435 S/N tex2html_wrap_inline1439 LC EC CI
3528 39 12:52:46.15-28:52:22.715.09 21521117 215211.52 0000
3558 83 13:27:51.43-31:24:51.614.40 13457 54 134574.37 0000
3559 69 13:28:31.21-29:05:31.014.14 14138 48 141385.02 0000
3562119 13:32:22.85-31:18:25.514.52 13673 54 136734.18 0000
3651 92 19:52:48.48-55:19:59.515.82 18191 63 181914.12 0000
3667113 20:12:09.39-57:21:52.916.68 16618 51 166185.12 0000
3677 18 20:24:46.90-33:32:00.516.42 31658 99 316582.44 0000
3682 11 20:27:02.36-37:05:55.416.63 27808120 278081.75 0000
3691 36 20:32:04.45-38:14:05.316.63 5566 90 55662.1614237200
3693 33 20:31:59.55-34:42:26.416.48 28067 66 280673.60 0000
3695 96 20:33:09.37-36:18:27.917.33 25863 44 258992.8025827733
3696 12 20:32:54.42-35:12:52.516.31 26456 84 264563.04 0000
3703 32 20:38:04.92-61:30:26.415.31 21104 60 211044.34 0000
3705 41 20:40:15.47-35:26:02.316.56 33855 75 338553.21 0000
3733 44 21:00:04.25-28:19:06.516.21 11163 51 111634.93 0000
3744 86 21:06:11.38-25:45:35.714.50 8923 40 89173.15 8929623
3764 43 21:23:52.32-35:02:18.216.07 22123 47 221122.7922134312
3781 15 21:32:37.62-66:56:11.817.70 21377 80 00.0021377100
3795 14 21:36:22.71-32:24:40.716.00 27349 60 273494.71 0000
3799 15 21:39:02.43-72:49:36.714.23 14212 66 142123.39 0000
3806119 21:46:41.42-57:38:45.916.84 41291 87 412912.69 0000
3809127 21:47:02.73-44:01:13.615.88 15377 51 153774.62 0000
3822101 21:53:58.39-57:47:59.816.25 22476 49 224722.6622480751
3825 90 21:56:43.41-60:27:42.816.32 23090 63 230903.71 0000
3827 22 21:59:07.15-60:13:25.8 0.00 29730 87 297302.88 0000
3864 41 22:18:19.18-52:49:07.416.03 29872 45 298643.0429880300
3879 82 22:28:58.27-69:28:29.116.33 20393 51 203935.09 0000
3897 13 22:37:27.54-17:40:15.216.62 22331 63 223314.30 0000
3921 38 22:48:20.06-64:38:35.116.35 27684 75 276843.11 0000
4008 43 23:28:41.59-39:37:43.716.99 48339105 483392.03 0000
4010 36 23:29:35.77-36:48:06.016.19 29042 66 290423.68 0000
4053 31 23:53:05.19-27:58:28.015.95 15190 80 00.0015190200
Table 1: continued

In Table 1 (click here) we show a summary of the catalogue; the total catalogue is available electronically from the CDS (and by anonymous ftp from: 132.229.214.2 as pub/katgert/enacs.cat, or from: 193.50.128.3 as amazure/enacs/enacs.cat). In Table 1 (click here) we give the results for one galaxy in each of the redshift surveys in the direction of the 107 target ACO clusters. By choosing the last entry in each survey we implicitly show the total number of redshifts measured towards a cluster.

The organization of Table 1 (click here) is as follows:

Column (1): sequence number of cluster in ACO catalogue (Abell et al. 1989)

Column (2): sequence number of galaxy in redshift survey of cluster (= total number of redshifts in the survey)

Column (3): right ascension (equinox 1950.0)

Column (4): declination (equinox 1950.0)

Column (5): R25, i.e. the isophotal R-magnitude within the 25 mag/arcsec2 isophote (a value of 0.00 means: not available)

Column (6): the adopted heliocentric velocity, cz, of the galaxy

Column (7): the estimated error in the adopted heliocentric velocity

Column (8): the heliocentric velocity, tex2html_wrap_inline1435, of the galaxy based on absorption lines (a value of 0 means: not available)

Column (9): the signal-to-noise ratio of the peak in the cross-correlation function used to derive tex2html_wrap_inline1673 (a value of 0.00 means: not available)

Column (10): the heliocentric velocity, tex2html_wrap_inline1439, of the galaxy based on emission lines (a value of 0 means: not available)

Column (11): code indicating the presence of emission lines, LC, 0: no emission lines seen; 1: OII tex2html_wrap_inline1677 3727; 2: Htex2html_wrap_inline1679; 3: OII tex2html_wrap_inline1677 3727 + Htex2html_wrap_inline1679; 4: OIII tex2html_wrap_inline1677 4959/5007; 5: OII tex2html_wrap_inline1677 3727 + OIII tex2html_wrap_inline1677 4959/5007; 6: Htex2html_wrap_inline1679 + OIII tex2html_wrap_inline1677 4959/5007; 7: OII tex2html_wrap_inline1677 3727 + Htex2html_wrap_inline1679 + OIII tex2html_wrap_inline1677 4959/5007

Column (12): excitation code, EC, 0: not available; 1: Htex2html_wrap_inline1679 > OIII tex2html_wrap_inline1677 5007; 2: OIII tex2html_wrap_inline1677 5007 > Htex2html_wrap_inline1679 > OIII tex2html_wrap_inline1677 4959; 3: Htex2html_wrap_inline1679 tex2html_wrap_inline1719 OIII tex2html_wrap_inline1677 4959; 4: Htex2html_wrap_inline1679 < OIII tex2html_wrap_inline1677 4959; 5: AGN (i.e.: very broad Htex2html_wrap_inline1679)

Column (13): continuum index, CI, (not given for spectra without emission lines) 0: not available; 1: featureless; 2: metallic absorption lines; 3: strong absorption under Htex2html_wrap_inline1679.

For a description of the methods employed in determining positions, magnitudes, redshifts and redshift errors we refer the reader to the relevant sections of Paper I. Note that among the 666 galaxies with both an emission- and an absorption-line redshift we have 80 cases in which the two redshift estimates are discordant (i.e. differ by more than 500 km/s). In these 80 cases we have derived the ENACS redshift according to a simple scheme which takes into account the estimated reliabilities for different categories of redshift estimates (see Sect. 4.3 in Paper I for more details). This scheme generally (but not always) selects the most probable value, but it does not take into account the redshifts of other galaxies in the cluster. Therefore, we list both redshift estimates.

While measuring the wavelengths of the emission lines, the relative intensities were also estimated. An indication of the line ratios is summarized in the Excitation Code. In view of the difficulties associated with estimating equivalent widths, especially for the narrow oxygen lines, the code in Col. 12 of Table 1 should be used with caution. On the other hand, the Excitation Code for AGN is thought to be quite reliable; in other words: this code was assigned only if there was little or no doubt about the AGN character of the ENACS spectrum of the object. As a consequence, it is possible that not every AGN in the catalogue has been assigned the AGN Excitation Code, because it is not certain that we have been able to recognize unambiguously all AGN as such from their ENACS spectrum.

Finally, for the galaxies with emission lines in their spectrum, an indication is frequently (but not always) given about the presence or absence of features in the continuum spectrum. When this Continuum Index is 0, this simply means that the quality of the spectrum was not sufficient for a reliable statement about the character of the continuum.

After the spectroscopic observations for the ENACS were done, we became aware of published redshifts for 33 galaxies without ENACS redshift, in the "Optopus areas" of the four ENACS clusters A168, A957, A1809 and A2052. Most of these 33 galaxies (viz. 21 of them) were in the galaxy catalogues that we prepared for the Optopus observations, so that we have positions and magnitudes for them in the same systems as for the ENACS galaxies. Some of these galaxies had been observed by us with Optopus, but without yielding a redshift; others were not observed. The remaining 12 (predominantly faint) galaxies for which non-ENACS redshifts have been published were not in our galaxy catalogues, and no magnitudes are available for them.

As these galaxies may be of interest in certain types of analysis (some are among the brightest galaxies in their parent cluster), we have listed all 33 in Table 2. The organization of Table 2 is as follows:

Column (1): sequence number of cluster in the ACO catalogue (Abell et al. 1989)

Column (2): right ascension (equinox 1950.0)

Column (3): declination (equinox 1950.0)

Column (4): R25, i.e. the isophotal R-magnitude within the 25 mag/arcsec2 isophote (0.00 means: not available, i.e. the galaxy is not in the catalogue we prepared for the Optopus observations)

Column (5): the heliocentric velocity, cz, of the galaxy

Column (6): the estimated error in the heliocentric velocity

Column (7): reference to source of redshift.


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