2003A&A...406..829B

Query : 2003A&A...406..829B

2003A&A...406..829B - Astronomy and Astrophysics, volume 406829-846 (2003/8-2)

The WSRT wide-field HI survey. I. The background galaxy sample.

BRAUN R., THILKER D. and WALTERBOS R.A.M.

Abstract (from CDS):

We have used the Westerbork array to carry out an unbiased wide-field survey for HI emission features, achieving an rms sensitivity of about 18mJy/Beam at a velocity resolution of 17km/s over 1800deg2 and between -1000<VHel<+6500km/s. The primary data consists of auto-correlation spectra with an effective angular resolution of 49' FWHM, although cross-correlation data were also acquired. The survey region is centered approximately on the position of Messier 31 and is Nyquist-sampled over 60x30° in RAxDec. More than 100 distinct features are detected at high significance in each of the two velocity regimes (negative and positive LGSR velocities). In this paper we present the results for our HI detections of external galaxies at positive LGSR velocity. We detect 155 external galaxies in excess of 8σ in integrated HI flux density. Plausible optical associations are found within a 30' search radius for all but one of our HI detections in DSS images, although several are not previously cataloged or do not have published red-shift determinations. Our detection without a DSS association is at low galactic latitude. Twenty-three of our objects are detected in HI for the first time. We classify almost half of our detections as ``confused'', since one or more companions is cataloged within a radius of 30' and a velocity interval of 400km/s. We identify a handful of instances of significant positional offsets exceeding 10kpc of unconfused optical galaxies with the associated HI centroid, possibly indicative of severe tidal distortions or uncataloged gas-rich companions. A possible trend is found for an excess of detected HI flux in unconfused galaxies within our large survey beam relative to that detected previously in smaller telescope beams, both as function of increasing distance and increasing gas mass. This may be an indication for a diffuse gaseous component on 100kpc scales in the environment of massive galaxies or a population of uncataloged low mass companions. We use our galaxy sample to estimate the HI mass function from our survey volume. Good agreement is found with the HIPASS BGC results, but only after explicit correction for galaxy density variations with distance.

Abstract Copyright: ∼

Journal keyword(s): galaxies: distances and redshifts - galaxies: evolution - galaxies: formation - galaxies: fundamental parameters - galaxies: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/A+A/406/829): wsrtgals.dat>

Nomenclature: Table 1: [BTW2003] JHHMM+DDMM N=146.

Simbad objects: 147

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Number of rows : 147
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 UGC 12894 G 00 00 22.55 +39 29 43.5   17       ~ 36 0
2 Z 477-40 LIN 00 01 38.3220061296 +23 29 01.190922432   13.2       ~ 159 1
3 Z 498-67 AG? 00 02 50.1656723400 +31 29 06.027616464   15.6       ~ 19 0
4 NGC 7819 GiG 00 04 24.495 +31 28 19.30   14.3       ~ 134 0
5 MCG+08-01-021 AG? 00 06 37.41 +47 52 37.9   16.0       ~ 16 0
6 NGC 1 GiP 00 07 15.8562637560 +27 42 29.020113144   13.4       ~ 126 0
7 Z 534-6 AG? 00 07 44.02 +40 52 31.7   15.5       ~ 17 0
8 NGC 23 AGN 00 09 53.411 +25 55 25.46   12.5       ~ 331 2
9 NGC 29 GiG 00 10 46.9110082032 +33 21 10.204234704   13.5       ~ 68 1
10 UGC 112 AG? 00 12 08.84 +41 45 12.3   17       ~ 15 0
11 MCG+06-01-019 LSB 00 13 50.90 +35 59 39.0   16.5       ~ 105 1
12 MCG+04-01-042 AG? 00 13 56.50 +26 58 03.0   16.5       ~ 20 0
13 UGC 288 G 00 29 04.58 +43 25 48.7   16.0       ~ 40 0
14 NAME Andromeda IV G 00 42 32.3 +40 34 19           ~ 80 0
15 Z 479-67 AG? 00 44 12.6446117592 +26 50 42.159458004   14.8       ~ 27 0
16 Z 501-16 GiG 00 47 50.1576447168 +29 57 34.878138552   15.4       ~ 19 0
17 NGC 262 Bla 00 48 47.14147900 +31 57 25.0845702 14.04 13.90 13.06 8.53   ~ 778 2
18 NGC 278 H2G 00 52 04.3452013728 +47 33 01.675026036   10.5       ~ 244 1
19 Z 536-16 LSB 01 04 01.17624 +41 50 39.4116   15.2       ~ 22 0
20 Z 536-20 GiP 01 10 28.899 +43 17 15.67   14.2       ~ 31 0
21 UGC 731 AG? 01 10 43.98 +49 36 07.9   17       ~ 103 0
22 LEDA 138333 AG? 01 14 45.617 +27 08 10.11   15.5       ~ 20 0
23 UGCA 16 AG? 01 17 42.29 +37 25 50.1   17       ~ 5 0
24 Z 502-39 GiG 01 20 53.10 +33 25 32.0   15.2       ~ 13 0
25 NGC 523 AG? 01 25 20.745 +34 01 30.57   13.5       ~ 123 1
26 Z 502-86 AG? 01 27 34.851 +31 33 16.87   14.4       ~ 71 0
27 Z 481-8 AG? 01 30 07.50 +25 51 50.0   15.3       ~ 43 0
28 Z 521-39 GiC 01 30 52.8212661456 +34 03 39.719313036   15.7       ~ 8 0
29 UGC 1084 AG? 01 31 22.043 +23 57 15.13   17       ~ 23 0
30 Z 552-1 AG? 01 35 31.4671348920 +47 32 57.389182404   15.2       ~ 17 0
31 [BTW2003] J0136+4759 G 01 36 40 +48 03.7           ~ 1 0
32 NGC 661 GiG 01 44 14.5989233928 +28 42 21.162014388   13.0       ~ 107 0
33 LEDA 90562 AG? 01 44 28.80 +27 55 44.0           ~ 24 0
34 MCG+04-05-005 LSB 01 45 32.251 +25 31 17.28   17       ~ 92 0
35 NGC 672 GiP 01 47 54.4764771528 +27 25 58.020709728 12.04 11.60 11.09 10.81   ~ 304 0
36 Z 503-26 LSB 01 49 31.71 +32 35 16.2   13.0       ~ 171 0
37 NGC 688 GiG 01 50 44.1668421624 +35 17 04.401559176   13.3   12.32   ~ 96 0
38 NGC 694 GiP 01 50 58.492 +21 59 51.18   13.9       ~ 111 0
39 NGC 697 H2G 01 51 17.568 +22 21 28.69   12.7       ~ 130 1
40 LEDA 2816200 G 01 53 44.6 +23 08 43           ~ 7 0
41 NGC 722 GiG 01 54 46.9727717328 +20 41 53.350476576   14.6       ~ 38 0
42 Z 522-69 GiG 01 55 58.4840330064 +37 07 45.942476520   14.9   13.31   ~ 38 0
43 NGC 753 GiG 01 57 42.2040241440 +35 54 57.729210264   12.6   11.59   ~ 207 1
44 NGC 746 LSB 01 57 51.004 +44 55 06.97   13.8       ~ 40 0
45 NGC 765 GiG 01 58 48.0134842920 +24 53 32.628852240   14.2       ~ 66 0
46 NGC 780 GiG 02 00 35.2405515624 +28 13 30.784918008   14.6       ~ 30 0
47 NGC 783 GiG 02 01 06.6095353032 +31 52 56.750490588   12.84       ~ 86 1
48 NGC 784 LSB 02 01 16.932 +28 50 14.13 12.97 12.50 12.07 11.83   ~ 212 0
49 UGC 1575 AG? 02 05 10.25 +24 39 58.6   18       ~ 22 0
50 Z 522-111 AG? 02 05 33.728 +34 52 51.35   15.2       ~ 43 0
51 NGC 812 AG? 02 06 51.497 +44 34 22.48   12.8       ~ 55 0
52 Z 504-18 AG? 02 09 10.138 +31 59 39.02   14.7       ~ 24 0
53 Z 538-34 GiC 02 13 59.8351703592 +41 52 36.744063708   15.0       ~ 25 0
54 Z 522-140 GiG 02 14 34.1261706504 +37 24 28.664117532   14.5       ~ 38 0
55 Z 483-12 AG? 02 15 44.074 +25 12 23.61   14.9       ~ 26 0
56 NGC 865 AG? 02 16 15.1129388808 +28 35 58.781816448   14.0       ~ 69 0
57 Z 504-48 AG? 02 17 33.899 +29 31 18.89   15.2       ~ 26 0
58 UGC 1791 AG? 02 19 53.66 +28 14 52.6   17       ~ 18 0
59 MCG+07-05-040 AG? 02 21 13.40 +42 45 45.7   11.26   14.38   ~ 46 0
60 Z 553-5 AG? 02 22 31.3616426136 +47 51 00.309217680   14.8       ~ 18 0
61 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
62 Z 483-18 AG? 02 22 55.36 +25 18 35.1   15.7       ~ 15 0
63 Z 504-74 GiG 02 24 31.5922963560 +31 36 54.681822036   14.9       ~ 42 0
64 MCG+06-06-028 AG? 02 25 00.22 +36 02 16.0   16.5   14.78   ~ 46 0
65 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 818 1
66 NGC 923 GiC 02 27 34.6197728760 +41 58 39.834753204   14.4   13.06   ~ 39 1
67 Z 504-86 GiG 02 27 49.7635 +31 43 30.264   15.4   14.2   ~ 42 0
68 NGC 931 Sy1 02 28 14.4689104272 +31 18 41.469363324   15.71 14.74     ~ 426 1
69 IC 1799 AG? 02 28 45.8855402088 +45 58 14.456988012   15.0       ~ 24 0
70 Z 504-98 GiG 02 29 59.9971443912 +28 38 01.643899560   14.9       ~ 32 0
71 NGC 949 GiG 02 30 48.6343005912 +37 08 11.754932532   12.667 11.975 11.490 10.790 ~ 152 0
72 NGC 959 GiG 02 32 23.9241457416 +35 29 40.455279636 12.87 12.95 12.38 11.79   ~ 123 1
73 UGC 2017 AG? 02 32 45.24 +28 50 26.9   17       ~ 23 0
74 Z 484-5 LSB 02 32 53.809 +23 19 39.60   15.6       ~ 29 0
75 MCG+06-06-054 AG? 02 32 54.00 +38 40 50.1   17   14.50   ~ 50 0
76 Z 505-6 GiG 02 33 18.20 +33 29 28.0   14.9   13.59   ~ 91 0
77 Z 539-46 GiG 02 33 42.96 +40 31 41.2   15.0   13.45   ~ 71 0
78 NGC 976 GiG 02 34 00.0380649672 +20 58 36.291595584   12.9       ~ 124 0
79 NGC 972 G 02 34 13.3574389680 +29 18 40.604917356   12.1 13.63     ~ 178 2
80 IC 1815 GiG 02 34 19.9881421680 +32 25 45.947152488   14.3       ~ 28 0
81 Z 505-16 AG? 02 34 29.31 +29 44 59.4   15.7       ~ 59 0
82 Z 523-66 AG? 02 35 22.5340319520 +37 29 09.042392580   14.6       ~ 29 0
83 Z 484-14 GiG 02 36 16.152 +25 25 25.75   14.00       ~ 122 0
84 IC 239 GiG 02 36 27.8262034392 +38 58 09.083372052   12.1   12.75   ~ 115 0
85 NGC 992 AGN 02 37 25.491 +21 06 03.04   13.5       ~ 144 1
86 NGC 1012 AG? 02 39 14.963 +30 09 06.01   13.1       ~ 99 1
87 NGC 1003 GiG 02 39 16.893 +40 52 20.25   12.1   10.83   ~ 198 0
88 [BTW2003] J0239+3015 G 02 39 55 +30 15.7           ~ 1 0
89 NGC 1023 AG? 02 40 24.0133575864 +39 03 47.663392896 10.91 10.35 9.35 7.83   ~ 689 2
90 LEDA 138534 AG? 02 40 24.816 +42 36 42.10           ~ 11 0
91 NGC 1023C GiG 02 40 39.59 +39 22 47.2       16.31   ~ 14 0
92 Z 505-33 AG? 02 41 00.516 +32 10 50.32   15.7       ~ 15 0
93 Z 539-78 AG? 02 42 10.832 +43 21 18.38   14.6   13.6   ~ 22 0
94 NGC 1056 Sy2 02 42 48.2914236192 +28 34 26.660028468   13.5       ~ 180 0
95 NGC 1058 Sy2 02 43 30.0264850248 +37 20 28.782851784   12.29 11.75 10.85   ~ 483 0
96 LEDA 2807108 G 02 45 02.9 +32 09 42   17.0       ~ 8 0
97 Z 524-20 GiP 02 47 55.4194406880 +37 32 18.528735876   14.3   12.8   ~ 131 0
98 NGC 1086 GiG 02 47 56.3534134344 +41 14 47.035174380   13.6       ~ 36 0
99 Z 539-123 GiC 02 54 26.2137967464 +42 39 00.254469996   15.7       ~ 33 0
100 NGC 1161 Sy2 03 01 14.1715734192 +44 53 50.674920288   13.20 12.08     ~ 84 0
101 NGC 1164 GiG 03 01 59.8393298136 +42 35 05.748991836   14.4       ~ 51 0
102 LEDA 2328690 G 03 02 25.7 +48 54 52           ~ 6 0
103 NGC 1213 LSB 03 09 17.309 +38 38 57.75   15.7       ~ 17 0
104 Z 555-4 GiG 03 32 07.321 +47 47 38.59   15.0       ~ 56 0
105 [BTW2003] J2202+4838 G 22 02 49 +48 38.3           ~ 1 0
106 Z 530-4 AG? 22 03 33.88 +43 44 57.2   15.5       ~ 46 0
107 Z 545-2 GiG 22 06 16.2064104456 +47 15 04.081666428   13.3       ~ 47 0
108 MCG+07-45-016 AG? 22 08 51.540 +44 32 23.54   16.0       ~ 22 0
109 Z 513-7 GiG 22 09 37.485 +39 16 57.99   14.4       ~ 39 0
110 NGC 7223 GiG 22 10 09.1658973672 +41 01 02.160700320   13.5       ~ 37 0
111 NGC 7231 GiG 22 12 30.117 +45 19 42.43   14.0       ~ 59 0
112 Z 530-20 GiG 22 16 50.4874969200 +41 30 10.030445748   13.5       ~ 54 0
113 MCG+08-40-004 AG? 22 18 09.6253720416 +45 42 18.538888788   17       ~ 13 0
114 NGC 7250 AG? 22 18 17.776 +40 33 44.66 13.18 13.22 12.58     ~ 126 1
115 NGC 7286 AG? 22 27 50.522 +29 05 45.57   13.4       ~ 52 0
116 NGC 7292 AG? 22 28 26.291 +30 17 29.91   13.10       ~ 111 0
117 Z 514-45 GiG 22 30 33.98 +33 49 10.8   15.5       ~ 73 0
118 [BTW2003] J2230+3842 G 22 30 37.9 +38 43 55           ~ 4 0
119 UGC 12077 AG? 22 33 19.299 +38 56 28.77   16.0       ~ 8 0
120 Z 495-7 AG? 22 34 10.90 +32 51 40.7   15.60       ~ 71 0
121 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1284 2
122 NGC 7332 GiP 22 37 24.5373044952 +23 47 53.830708800   12.0       ~ 391 0
123 Z 514-98 AG? 22 41 48.7462389864 +37 43 08.950414908   15.6       ~ 15 0
124 MCG+05-53-019 AG? 22 50 30.2654507664 +29 08 19.524600636   16.0       ~ 42 0
125 Z 475-33 AG? 23 04 33.805 +27 09 22.22   15.6       ~ 26 0
126 Z 496-58 AG? 23 13 43.4200933656 +29 00 38.652846660   14.9       ~ 41 0
127 NGC 7640 GiG 23 22 06.5746017072 +40 50 43.114729056   11.6       ~ 180 0
128 NGC 7664 GiG 23 26 39.7787170248 +25 04 48.873107316   13.30       ~ 154 0
129 NGC 7673 EmG 23 27 41.060 +23 35 20.18 12.84 13.17 12.76     ~ 282 2
130 Z 497-22 AG? 23 28 00.747 +31 00 52.17   15.7       ~ 16 0
131 NGC 7678 AGN 23 28 27.8628511800 +22 25 16.568913432   15.3       ~ 212 1
132 Z 533-8 GiG 23 29 58.540 +40 59 31.98   15.7       ~ 110 0
133 Z 497-32 AG? 23 30 26.9830560528 +30 13 18.938715600   14.9       ~ 33 0
134 Mrk 930 AGN 23 31 58.630 +28 56 50.51 14.27 15.04 14.63 14.56 14.46 ~ 147 0
135 Z 476-66 AG? 23 33 12.854 +26 52 15.72   15.5       ~ 16 0
136 Z 497-41 AG? 23 35 43.623 +32 23 06.24   15.6       ~ 37 0
137 UGC 12697 AG? 23 36 00.80 +35 55 56.5   17       ~ 14 0
138 Z 497-44 AG? 23 38 14.758 +30 42 33.24   15.1       ~ 57 0
139 Z 476-100 G 23 39 38.3502067800 +25 05 42.254893500   15.7       ~ 12 0
140 Z 476-106 GiP 23 40 39.86 +26 14 11.1   14.5       ~ 146 0
141 Z 498-8 AG? 23 46 12.1880451720 +33 22 13.288182960   14.20       ~ 65 0
142 APG 86 PaG 23 47 01.7 +29 28 16           ~ 133 1
143 NGC 7753 AG? 23 47 04.834 +29 29 00.17   13.2       ~ 181 0
144 Z 477-12 GiG 23 48 49.40 +26 13 14.0   15.2       ~ 52 0
145 Z 548-8 LSB 23 49 19.5586149648 +47 55 07.235122548   15.2       ~ 14 0
146 Z 498-39 LSB 23 55 41.880 +31 53 58.90   15.4       ~ 47 0
147 IC 1525 GiG 23 59 15.8326855080 +46 53 21.123053088   13.3       ~ 52 0

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