2017ApJ...838..148P

Query : 2017ApJ...838..148P

2017ApJ...838..148P - Astrophys. J., 838, 148-148 (2017/April-1)

OmegaWINGS: the first complete census of post-starburst galaxies in clusters in the local universe.

PACCAGNELLA A., VULCANI B., POGGIANTI B.M., FRITZ J., FASANO G., MORETTI A., JAFFE Y.L., BIVIANO A., GULLIEUSZIK M., BETTONI D., CAVA A., COUCH W. and D'ONOFRIO M.

Abstract (from CDS):

Galaxies that abruptly interrupt their star formation in 1.5 Gyr present recognizable features in their spectra (no emission and Hδ in absorption) and are called post-starburst (PSB) galaxies. By studying their stellar population properties and their location within the clusters, we obtain valuable insights on the physical processes responsible for star formation quenching. We present the first complete characterization of PSB galaxies in clusters at 0.04 z 0.07, based on WINGS and OmegaWINGS data, and contrast their properties to those of passive (PAS) and emission-line (EML) galaxies. For V 20, PSBs represent 7.2 ± 0.2% of cluster galaxies within 1.2 virial radii. Their incidence slightly increases from the outskirts toward the cluster center and from the least toward the most luminous and massive clusters, defined in terms of X-ray luminosity and velocity dispersion. The phase-space analysis and velocity-dispersion profile suggest that PSBs represent a combination of galaxies with different accretion histories. Moreover, PSBs with the strongest Hδ are consistent with being recently accreted. PSBs have stellar masses, magnitudes, colors, and morphologies intermediate between PAS and EML galaxies, typical of a population in transition from being star-forming to passive. Comparing the fraction of PSBs to the fraction of galaxies in transition on longer timescales, we estimate that the short-timescale star formation quenching channel contributes two times more than the long timescale one to the growth of the passive population. Processes like ram-pressure stripping and galaxy-galaxy interactions are more efficient than strangulation in affecting star formation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: formation - galaxies: star formation - galaxies: star formation

Simbad objects: 33

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Number of rows : 33
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 ACO 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
3 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
4 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
5 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
6 ACO 193 ClG 01 25 07.3 +08 41 36           ~ 192 0
7 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
8 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
9 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
10 ACO 500 ClG 04 38 55.0 -22 05 55           ~ 89 0
11 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
12 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 229 0
13 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
14 ACO 957 ClG 10 14 02.35 -00 53 30.0           ~ 225 2
15 ACO 970 ClG 10 17 34.3 -10 42 01           ~ 93 0
16 ACO 1069 ClG 10 39 54.3 -08 36 40           ~ 116 1
17 ACO 1631 ClG 12 52 50.6 -15 25 37           ~ 176 1
18 ACO 3528 ClG 12 54 18.2 -29 01 16           ~ 166 1
19 ACO 3530 ClG 12 55 36.0 -30 20 49           ~ 109 0
20 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
21 ACO 3556 ClG 13 24 06.2 -31 39 38           ~ 159 0
22 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
23 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 145 1
24 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
25 ACO 3716 ClG 20 51 16.7 -52 41 43           ~ 123 1
26 Z 375-15 BiC 21 13 55.918 +02 33 55.39   15.1       ~ 67 1
27 ACO 3809 ClG 21 46 57.5 -43 54 06           ~ 99 0
28 ACO 2382 ClG 21 51 57.2984 -15 36 48.067           ~ 122 0
29 ACO 2399 ClG 21 57 19.01 -07 50 57.5           ~ 197 0
30 ACO 2415 ClG 22 05 25.0 -05 35 23           ~ 124 1
31 ACO 3880 ClG 22 27 49.5 -30 34 40           ~ 104 2
32 ACO 2457 ClG 22 35 40.30 +01 31 33.6           ~ 139 0
33 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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