2 The sample

Galaxies observed in this work have been selected from the Virgo Cluster Catalogue (VCC) of Binggeli et al. (1985), which is complete to the optical Bmagnitude $m_{\rm pg} = 18.0$. The targets were selected according to the following criteria:

-

$m_{\rm pg}$ < 16.0;

-

Hubble type later than S0a;

-

classified as cluster members, possible members or belonging to the W, W', M clouds or to the southern extension (Binggeli et al. 1985; 1993).

Among the 312 late-type Virgo cluster members matching these criteria, 235 objects (75%) either included in the present work or in Papers I and III have an H$\alpha$ measurement. Moreover limiting to the ISO sample described in Boselli et al. (1997a), 86 out 88 galaxies (98%) have H$\alpha$ data. Given the large field of view of the detectors, some galaxies not matching the selection criteria were serendipitously observed in the fields of other targets.

Few galaxies in the Coma/A1367 supercluster and in A2197 and A2199 were also observed as fillers, as well as a few nearby objects.

The target galaxies, as well as the serendipitously observed objects, are listed in Table 1, arranged as follow:

• Column 1: VCC designation, from Binggeli et al. (1985) for Virgo galaxies, or CGCG (Zwicky et al. 1961-68) for Coma supercluster and A2197 and A2199 galaxies;
• Column 2: NGC/IC name;
• Column 3: UGC name (Nilson 1973);
• Columns 4 and 5: (B1950.0) celestial coordinates, from NED;
• Columns 6 and 7: major an minor optical diameters. For VCC galaxies the diameters are measured on the du Pont plates at the faintest detectable isophote. For CGCG galaxies these are the major and minor optical diameters (a₂₅, b₂₅) (in arcmin) derived as explained in Gavazzi & Boselli (1996);
• Column 8: heliocentric velocity, in km s^-1, from the VCC or from Gavazzi et al. (1999b);
• Column 9: cluster membership as defined in Gavazzi et al. (1999a) for Virgo and in Gavazzi et al. (1999b) for the Coma/A1367 supercluster;
• Column 10: distance, in Mpc. Distances to the various substructures of Virgo are as given in Gavazzi et al. (1999a). A distance of 96, 125, 122 Mpc is assumed for galaxies in the Coma, A2197 and A2199 clusters respectively. For galaxies not belonging to the clusters, the distance is determined from the redshift assuming H₀= 75 $\rm km~s^{-1}~Mpc^{-1}$;
• Column 11: angular distance from the cluster centre, in degrees;
• Column 12: morphological type as given in the VCC or in Gavazzi & Boselli (1996);
• Column 13: photographic magnitude;
• Column 14: optical magnitude determined and corrected for dust extinction as described in Gavazzi & Boselli (1996);
• Column 15: total extrapolated H band magnitude, uncorrected for extinction, determined as described in Gavazzi et al. (2000).

For the nearby galaxies, Table 2 lists the relevant informations taken from NED.

   

Table 1: The target galaxies.

Virgo
VCC	NGC/IC	UGC	RA(1950)	Dec	a	b	Vel	Clust	Dist	$\theta$	Type	$m_{\rm pg}$	$B_{\rm T}^0$	$H_{\rm T}$
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)
67	3044	7216	121015.5	141515.0	2.26	0.79	-183	M	32	4.66	Sc	13.98	13.62	11.27
87	-	-	121108.2	154354.0	1.45	0.72	-134	N	17	5.17	Sm	15.00	15.27	13.64
92	4192	7231	121115.5	151042.0	9.78	2.60	-135	N	17	4.84	Sb	10.92	9.87	7.07
145	4206	7260	121244.0	131807.0	5.10	0.85	702	N	17	3.84	Sc	12.77	11.70	9.62
152	4207	7268	121257.3	95149.0	1.96	0.89	592	N	17	4.69	Scd	13.48	12.98	9.77
159	-	-	121308.4	83348.0	1.04	0.52	2584	W	32	5.54	Im	15.08	16.02	13.20
165	-	-	121320.5	132937.0	1.25	0.85	255	N	17	3.73	S0	14.87	15.51	11.54
167	4216	7284	121321.5	132540.0	9.12	2.16	140	N	17	3.72	Sb	10.97	9.89	6.69
222	4235	7310	121436.7	72809.0	4.33	0.71	2410	W	32	6.19	Sa	12.62	11.72	8.73
234	4241	7319	121452.6	65804.0	3.36	1.87	2237	W	32	6.59	Sa	12.99	12.69	9.23
267	3115	7333	121526.7	65553.0	2.01	2.01	733	B	23	6.55	Sbc	13.82	14.06	10.87
307	4254	7345	121617.0	144139.0	6.15	5.60	2405	N	17	3.55	Sc	10.43	10.41	7.21
315	-	-	121627.3	62220.0	1.10	0.67	1612	W	32	6.94	Sa	14.98	-	-
341	4260	7361	121649.0	62234.0	3.52	1.75	1958	B	23	6.90	Sa	12.70	12.43	8.72
371	4268	7371	121713.9	53340.0	1.84	0.57	2377	W	32	7.61	S0	13.73	13.70	9.81
375	4270	7376	121715.4	54431.0	2.16	1.00	2494	W	32	7.44	S0	13.11	13.13	9.29
382	4273	7380	121722.7	53713.0	2.01	1.29	2378	W	32	7.55	Sc	12.37	12.11	9.34
386	4277	-	121730.5	53707.0	1.55	0.97	2499	W	32	7.54	Sa	14.47	14.22	10.80
408	4281	7389	121748.4	53951.0	3.36	1.16	2711	W	32	7.47	S0	12.27	12.18	7.84
446	-	-	121824.6	63654.0	0.85	0.43	825	B	23	6.52	Im/BCD	15.50	-	13.40
483	4298	7412	121900.5	145301.0	3.60	2.01	1136	A	17	3.16	Sc	12.08	11.59	8.49
497	4302	7418	121910.1	145230.0	6.74	1.60	1150	A	17	3.13	Sc	12.55	11.33	8.15
524	4307	7431	121933.0	91917.0	3.95	0.72	1092	B	23	3.98	Sbc	12.79	12.08	9.52
559	4312	7442	121959.3	154852.0	5.10	1.24	153	A	17	3.74	Sab	12.56	11.92	8.99
570	4313	7445	122006.1	120442.0	5.10	1.16	1443	A	17	2.09	Sab	12.73	11.65	8.81
596	4321	7450	122022.9	160558.0	9.12	8.11	1575	A	17	3.93	Sc	10.11	9.93	6.69
608	4322	-	122029.7	161058.0	1.25	0.62	1803	A	17	3.99	dE	14.94	15.24	11.78
630	4330	7456	122044.6	113845.0	5.86	1.45	1564	A	17	2.11	Sd	13.10	12.97	9.77
634	4328	-	122048.0	160548.0	1.65	1.28	499	A	17	3.88	dE	14.14	14.46	10.94
641	-	-	122055.3	60537.0	0.73	0.24	906	B	23	6.82	BCD	15.08	-	13.87
656	4343	7465	122105.9	71352.0	2.48	0.93	1014	B	23	5.72	Sb	13.14	12.73	9.34
657	4342	7466	122106.6	71954.0	1.55	0.47	714	B	23	5.62	S0	13.54	13.24	9.10
664	3258	7470	122112.1	124520.0	2.60	1.87	-427	A	17	1.73	Sc	13.50	13.36	11.98
672	4341	7472	122120.4	72300.0	1.87	0.43	934	B	23	5.56	S0	14.21	14.22	10.81
697	3267	7474	122132.7	71906.0	1.55	1.55	1231	B	23	5.60	Sc	14.17	14.03	11.05
792	4380	7503	122249.6	101738.0	3.52	1.75	971	B	23	2.73	Sab	12.36	12.02	8.55
794	-	7504	122250.4	164224.0	1.71	0.43	918	A	17	4.25	dS0	15.50	-	12.56
797	-	-	122252.8	182506.0	0.68	0.45	773	A	17	5.90	dE	17.00	16.91	-
798	4382	7508	122252.8	182760.0	5.86	3.36	760	A	17	5.94	S0	10.09	10.17	6.55
801	4383	7507	122253.8	164449.0	2.60	1.29	1710	A	17	4.28	?	12.68	12.74	9.63
836	4388	7520	122314.5	125617.0	5.10	1.24	2515	A	17	1.26	Sab	11.83	10.98	8.26
857	4394	7523	122324.3	182926.0	3.60	3.60	914	A	17	5.94	Sb	11.76	11.91	8.24
865	4396	7526	122327.5	155649.0	3.36	1.00	-124	A	17	3.48	Sc	13.02	12.24	10.33
873	4402	7528	122335.3	132320.0	3.95	1.16	234	A	17	1.36	Sc	12.56	11.74	8.58
874	4405	7529	122335.5	162728.0	1.89	1.11	1738	A	17	3.96	Sc	12.99	12.70	9.61
905	-	7537	122356.6	90853.0	2.79	2.79	1290	B	23	3.68	Sc	13.42	13.60	11.07
912	4413	7538	122400.1	125316.0	2.92	1.75	105	A	17	1.07	Sbc	12.97	12.68	9.84
916	-	-	122401.1	130111.0	0.43	0.37	1349	A	17	1.10	dE	16.04	16.35	12.36
939	4411b	7546	122414.7	90940.0	3.45	3.45	1271	B	23	3.65	Sc	12.92	12.97	10.53
958	4419	7551	122424.6	151924.0	3.52	1.39	-273	A	17	2.82	Sa	12.13	11.66	8.03
979	4424	7561	122439.2	94151.0	4.33	2.16	438	B	23	3.10	Sa	12.32	12.05	9.08
984	4425	7562	122441.3	130041.0	2.99	1.00	1883	A	17	0.94	Sa	12.82	12.33	9.60
995	3371	7565	122449.3	110831.0	1.53	0.11	928	A	17	1.75	Sc	15.32	13.46	13.00
1002	4430	7566	122453.5	63220.0	3.02	2.69	1450	B	23	6.19	Sc	12.48	12.65	9.60
1003	4429	7568	122454.1	112305.0	8.12	3.52	1130	A	17	1.53	S0a	11.15	10.58	7.03
1145	4457	7609	122626.0	35051.0	2.92	2.92	884	SE	17	8.83	Sb	11.66	11.69	7.96
1182	4465	-	122651.0	81812.0	0.65	0.32	7368	back	98	4.38	Sc	15.10	15.50	-
1189	3414	7621	122656.1	70247.0	1.84	1.07	597	SE	17	5.63	Sc	13.70	13.62	11.40
1190	4469	7622	122655.5	90134.0	4.33	1.29	508	B	23	3.66	Sa	12.22	11.84	8.27
1192	4467	-	122657.8	81613.0	0.73	0.47	1474	SE	17	4.41	E	15.04	15.28	10.97
1203	-	-	122704.8	81236.0	0.65	0.65	948	SE	17	4.47	S0	15.70	16.34	12.72
1205	4470	7627	122705.3	80559.0	1.84	1.15	2339	SE	17	4.58	Sc	13.04	12.81	10.22
1375	-	7668	122906.2	41256.0	4.76	3.77	1732	SE	17	8.45	Sc	12.00	11.80	11.17
1401	4501	7675	122927.5	144143.0	7.23	3.86	2284	A	17	2.05	Sbc	10.27	10.13	6.60
1412	4503	7680	122934.2	112708.0	4.33	1.71	1342	A	17	1.25	Sa	12.12	11.73	8.28
1419	4506	7682	122938.9	134143.0	2.16	1.29	737	A	17	1.08	S..	13.64	13.59	10.38
1450	3476	7695	123010.5	141929.0	2.60	2.01	-173	A	17	1.72	Sc	13.29	13.24	10.96
1453	3478	7696	123012.8	142819.0	1.15	0.89	1949	A	17	1.86	dE	14.34	14.74	11.59
1486	3483	-	123038.1	113722.0	1.10	0.78	129	A	17	1.19	S..	15.30	14.84	12.05
1507	-	-	123056.4	40412.0	1.16	0.57	910	SE	17	8.62	Sm	15.08	-	-
1540	4527	7721	123135.2	25543.0	5.86	1.87	1736	SE	17	9.77	Sb	11.32	10.63	7.27
1552	4531	7729	123144.3	132101.0	4.24	2.42	195	A	17	1.08	Sa	12.58	12.25	8.98
1555	4535	7727	123148.0	82826.0	8.33	7.43	1962	SE	17	4.28	Sc	10.51	10.66	7.64
1562	4536	7732	123153.8	22750.0	7.23	3.28	1807	SE	17	10.24	Sc	11.01	10.65	7.78
1569	3520	-	123200.3	134645.0	1.07	0.71	799	A	17	1.43	Scd	15.00	15.55	13.51
1572	-	-	123201.8	25042.0	0.93	0.29	1848	SE	17	9.87	BCD	16.00	16.45	-

 

Table 1: continued.

VCC	NGC/IC	UGC	RA(1950)	Dec	a	b	Vel	Clust	Dist	$\theta$	Type	$m_{\rm pg}$	$B_{\rm T}^0$	$H_{\rm T}$
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)
1575	3521	7736	123206.8	72610.0	2.00	1.41	597	SE	17	5.32	Sm	13.98	13.79	11.23
1588	4540	7742	123219.5	154937.0	2.60	1.87	1288	A	17	3.31	Scd	12.81	12.44	9.41
1673	4567	7777	123401.0	113159.0	2.92	1.87	2277	A	17	1.80	Sc	12.08	10.83	8.64
1676	4568	7776	123402.5	113050.0	5.10	1.75	2255	A	17	1.82	Sc	11.70	10.38	7.70
1678	3576	7781	123405.1	65347.0	2.16	1.87	1073	SE	17	5.94	Sd	13.70	14.46	12.47
1690	4569	7786	123418.5	132616.0	10.73	5.35	-216	A	17	1.65	Sab	10.25	9.68	7.02
1730	4580	7794	123515.9	53836.0	2.16	1.60	1032	SE	17	7.23	Sc	12.61	12.55	8.82
1760	4586	7804	123555.1	43537.0	4.33	1.16	792	SE	17	8.29	Sa	12.54	12.15	8.74
1859	4606	7839	123826.2	121109.0	5.10	2.01	1645	E	17	2.52	Sa	12.52	12.24	9.30
1868	4607	7843	123841.0	120936.0	3.95	0.78	2255	E	17	2.59	Scd	13.75	12.79	9.74
1929	4633	7874	124006.5	143748.0	2.48	1.07	291	E	17	3.48	Scd	13.77	13.16	10.75
1931	-	-	124010.2	133224.0	1.26	0.70	1100	E	17	3.02	Im	15.20	-	13.04
1932	4634	7875	124010.2	143412.0	2.92	0.87	116	E	17	3.45	Sc	13.19	12.30	9.68
1941	-	-	124018.6	133354.0	0.32	0.32	1213	E	17	3.06	dE	18.00	-	-
1943	4639	7884	124021.5	133152.0	3.20	2.01	1048	E	17	3.06	Sb	12.19	12.12	8.90
2037	-	-	124343.8	102848.0	0.88	0.38	1142	E	17	4.37	Im/BCD	15.92	16.20	12.55
2066	4694	7969	124544.0	111528.0	3.20	1.16	1181	E	17	4.49	?	12.19	12.29	9.28
14063	4517	7694	123011.8	2316.0	11.00	2.05	1129	SE	17	12.29	Sc	12.40	10.46	7.61
71060	4746	8007	124924.6	122118.0	2.20	0.61	1779	E	17	5.16	Sd	13.30	13.42	9.87
Coma/A1367 supercluster
CGCG	NGC/IC	UGC	RA(1950)	Dec	a	b	Vel	Clust	Dist	$\theta$	Type	$m_{\rm pg}$	$B_{\rm T}^0$	$H_{\rm T}$
160065	-	-	125605.3	281703.0	0.90	0.82	7188	A1656	96	0.31	E	15.00	15.01	11.19
160069	3943	-	125611.5	282300.0	1.10	0.36	6827	A1656	96	0.32	S0a	15.60	14.87	11.47
160213	4858	-	125637.3	282306.2	0.51	0.43	9386	A1656	96	0.24	Pec	15.50	15.65	13.07
160214	-	-	125637.0	282941.0	0.88	0.47	8028	A1656	96	0.31	S0	15.30	15.28	11.29
160215	4860	-	125639.2	282335.0	0.96	0.80	7966	A1656	96	0.23	E	14.70	14.57	10.59
160216	3955	-	125641.2	281559.0	0.71	0.58	7895	A1656	96	0.18	S0	15.60	15.45	11.49
160221	4864	-	125648.3	281446.0	1.51	0.81	6760	A1656	96	0.15	E	14.80	14.45	10.82
160222	4867	-	125650.4	281424.0	0.64	0.43	4818	A1656	96	0.15	E	15.50	15.45	11.58
161043	5131	8422	132137.4	311453.4	1.91	0.38	6638	Isol	88	6.03	Sa	14.40	13.38	10.19
161069	5187	-	132729.7	312316.7	0.90	0.77	7172	Isol	96	7.22	Sb	14.60	14.65	11.17
A2197/A2199
CGCG	NGC/IC	UGC	RA(1950)	Dec	a	b	Vel	Clust	Dist	$\theta$	Type	$m_{\rm pg}$	$B_{\rm T}^0$	$H_{\rm T}$
224008	-	362	162112.6	395425.0	1.28	0.72	9628	A2199	125	1.14	Sb	15.40	14.50	10.98
224009	-	367	162133.9	400206.0	1.23	1.17	9873	A2199	125	1.11	Sb	14.60	14.28	10.93
224037N	-	-	162645.1	411639.0	0.80	0.70	9800	A2197	122	0.43	S..	15.50	15.39	11.45
224037S	-	-	162647.9	411609.6	0.55	0.50	9489	A2197	122	0.42	S0	15.50	15.64	11.60
224038	-	407	162648.3	411938.0	0.77	0.70	8446	A2197	122	0.47	Pec	14.30	14.28	11.86
224046	-	415	162720.8	412333.0	1.14	0.91	9401	A2197	122	0.49	Sb	14.80	14.53	11.04

 

 

Table 2: The nearby galaxies.

Name	RA(1950)	Dec	a	b	Vel	Type	$m_{\rm pg}$	$B_{\rm T}^0$
M51	132746.3	472710.3	11.2	6.9	463	SA(s)bcpec	8.96	8.67
M81	95127.3	691808.3	26.9	14.1	-34	SA(s)ab	7.89	7.39
M82	95143.5	695500.8	11.2	4.3	203	I0;Sbrst	9.30	8.86
M106	121629.4	473453.2	18.6	7.2	448	SAB(s)bc	9.10	8.53
NGC 925	22417.0	332116.9	10.5	5.9	553	SAB(s)d	10.69	9.97
NGC1637	43857.5	-25711.9	4.0	3.2	717	SAB(rs)c	11.47	11.25
NGC2403	73202.3	654250.7	21.9	12.3	131	SAB(s)cd	8.93	8.43
NGC2541	81101.8	491251.0	6.3	3.2	559	SA(s)cd	12.26	11.57
NGC2805	91617.0	641852.8	6.3	4.8	1730	SAB(rs)d	11.52	11.18
NGC2903	92920.3	214321.5	12.6	6.0	556	SB(s)d	9.68	9.11
NGC5195	132752.5	473132.0	5.8	4.6	465	SB0pec	10.45	10.45