2018MNRAS.478.3447E

Query : 2018MNRAS.478.3447E

2018MNRAS.478.3447E - Mon. Not. R. Astron. Soc., 478, 3447-3466 (2018/August-2)

Enhanced atomic gas fractions in recently merged galaxies: quenching is not a result of post-merger gas exhaustion.

ELLISON S.L., CATINELLA B. and CORTESE L.

Abstract (from CDS):

We present a detailed assessment of the global atomic hydrogen gas fraction (fgas = log[M_ H I/M*_]) in a sample of post-merger galaxies identified in the Sloan Digital Sky Survey (SDSS). Archival H I measurements of 47 targets are combined with new Arecibo observations of a further 51 galaxies. The stellar mass range of the post-merger sample, our observing strategy, detection thresholds and data analysis procedures replicate those of the extended GALEX Arecibo SDSS Survey (xGASS) which can therefore be used as a control sample. Our principal results are (1) the post-merger sample shows a ∼50 per cent higher H I detection fraction compared with xGASS; (2) accounting for non-detections, the median atomic gas fraction of the post-merger sample is larger than the control sample by 0.3-0.6 dex; and (3) the median atomic gas fraction enhancement (Δfgas), computed on a galaxy-by-galaxy basis at fixed stellar mass, is 0.51 dex. Our results demonstrate that recently merged galaxies are typically a factor of ∼3 more H I rich than control galaxies of the same M*. If the control sample is additionally matched in star formation rate, the median H I excess is reduced to Δfgas = 0.2 dex, showing that the enhanced atomic gas fractions in post-mergers are not purely a reflection of changes in star formation activity. We conclude that merger-induced starbursts and outflows do not lead to prompt quenching via exhaustion/expulsion of the galactic gas reservoirs. Instead, we propose that if star formation ceases after a merger, it is more likely due to an enhanced turbulence which renders the galaxy unable to effectively form new stars.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: interactions - galaxies: ISM - galaxies: peculiar

VizieR on-line data: <Available at CDS (J/MNRAS/478/3447): table1.dat table2.dat>

Simbad objects: 107

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Number of rows : 107
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 Z 118-40 AGN 08 00 28.5239302032 +21 08 10.509222732   15.60       ~ 32 0
2 Z 88-21 AG? 08 01 58.4934208440 +15 03 31.482232092   15.7       ~ 23 0
3 LEDA 1368491 G 08 03 03.9042014808 +09 40 46.691669496           ~ 11 0
4 Z 118-56 rG 08 03 28.0664075088 +25 06 09.524485260   15.2       ~ 58 0
5 Z 59-32 rG 08 03 56.3865321912 +08 41 58.647617088   15.1       ~ 31 0
6 Z 31-51 AG? 08 07 24.8078956272 +06 51 47.579397660   15.4       ~ 22 0
7 Z 88-37 GiG 08 07 40.9786160184 +14 56 35.646371016   15.3       ~ 19 0
8 Z 59-58 EmG 08 17 52.6354415142 +12 53 52.861161265   15.1       ~ 22 0
9 Z 31-76 G 08 17 54.2311542672 +03 22 33.394901304   15.3       ~ 17 0
10 SDSS J082044.84+192143.9 G 08 20 44.8350548568 +19 21 43.816278420           ~ 2 0
11 LEDA 1378914 G 08 22 58.66080 +10 23 51.5292           ~ 2 0
12 Z 179-8 AG? 08 28 54.3231625560 +34 39 05.921288892   14.6 15.27     ~ 27 0
13 Z 149-56 bCG 08 35 33.05426 +30 32 03.4265   15.0       ~ 46 0
14 NVSS J085210+025022 rG 08 52 10.127 +02 50 24.89           ~ 24 0
15 Z 90-43 G 08 57 27.9399896784 +20 07 44.231475828   15.7       ~ 8 0
16 Z 34-11 G 09 12 03.6683028168 +02 52 33.032042292   15.7       ~ 18 0
17 LEDA 1651639 G 09 27 33.5663420016 +21 31 05.167216020           ~ 13 0
18 Z 35-12 AG? 09 36 06.965 +03 00 41.96   15.5       ~ 20 0
19 Z 122-31 G 09 37 11.8172718720 +21 40 09.337997892   15.7       ~ 28 0
20 Z 92-21 G 09 39 30.4798546920 +19 07 46.033154868   15.4       ~ 11 0
21 Z 7-34 rG 09 47 11.755 +00 42 09.72   15.5       ~ 18 0
22 Z 153-7 G 09 58 51.3337529544 +32 04 23.442777228   15.5       ~ 35 0
23 LEDA 1205871 G 10 04 33.4737153216 +01 47 15.915312816   15.769   14.553   ~ 14 0
24 Z 36-41 AGN 10 07 20.6576699544 +04 04 45.497033688   15.1       ~ 31 0
25 Z 93-66 rG 10 10 38.2569801696 +16 41 06.010192716   14.9       ~ 24 0
26 NVSS J101410+342036 rG 10 14 10.56460 +34 20 34.8118   16       ~ 25 0
27 Z 36-77 rG 10 15 59.944 +04 57 17.12   14.7       ~ 46 0
28 Z 154-5 G 10 23 12.7402749192 +29 51 41.876948736   15.6       ~ 18 0
29 LEDA 1406790 G 10 27 22.4241828216 +12 17 01.207597272           ~ 13 0
30 LEDA 86621 G 10 30 36.7252896552 +21 51 18.254346192           ~ 16 0
31 Z 37-112 rG 10 41 09.7418947440 +06 49 12.037465128   15.7       ~ 21 0
32 7C 1040+2921 LIN 10 43 00.3979296024 +29 06 04.424869476     15.48     ~ 14 0
33 NVSS J104428+303941 rG 10 44 28.9598515464 +30 39 39.058944120           ~ 14 0
34 Z 10-4 G 10 45 03.5810689296 +00 26 03.691846788   15.76 14.98 14.672   ~ 19 0
35 Z 155-9 LIN 10 47 11.2026303984 +30 43 27.809614236   15.6       ~ 27 0
36 2MASX J10534404+2958414 Sy2 10 53 44.0793160488 +29 58 41.359572120           ~ 10 0
37 2MASX J10562124+0145541 GiC 10 56 21.278 +01 45 54.43   16   16.001   ~ 13 0
38 LEDA 1392627 G 11 01 07.52615 +11 22 20.5086           ~ 5 0
39 MCG+05-26-053 LIN 11 05 53.7529448856 +28 47 58.998854688   16.0 14.94     ~ 30 0
40 Z 39-13 LSB 11 08 54.4940152032 +02 40 38.535303000   15.3       ~ 20 0
41 Z 39-40 GiG 11 10 37.4624217936 +04 11 28.728497436   15.3       ~ 19 0
42 LEDA 1802018 G 11 13 40.5418069200 +27 14 28.113863172           ~ 12 0
43 Z 126-26 LIN 11 18 36.292 +24 52 03.39   15.7       ~ 22 0
44 Z 185-33 G 11 18 37.8017114880 +33 29 09.571514712   15.6       ~ 14 0
45 MCG+03-30-009 GiC 11 34 44.6769278376 +19 02 00.443936940   16       ~ 16 0
46 IC 2941 LIN 11 36 09.9737501664 +10 03 20.027333340   15.0       ~ 28 0
47 Z 68-89 G 11 54 24.9707590344 +09 36 32.506809912   15.5       ~ 11 0
48 LARCS a1437r05-575 GiC 11 56 57.49645 +03 16 50.1831   17.05   16.25   ~ 5 0
49 Z 41-27 AG? 12 02 54.6699034848 +05 36 45.387259992   15.1       ~ 18 0
50 2MASX J12031418+0449559 AG? 12 03 14.1899726952 +04 49 55.770763296           ~ 11 0
51 Z 13-54 GiG 12 03 59.57565 +01 24 39.0571   15.4   14.726   ~ 31 0
52 Z 128-49 EmG 12 10 34.6824678792 +25 55 41.566703052   15.0       ~ 40 0
53 LEDA 3089508 EmG 12 14 42.44422 +24 58 50.0624           ~ 19 0
54 MCG+06-27-047 EmG 12 20 15.689 +33 39 39.09   16.0       ~ 43 0
55 NGC 4320 rG 12 22 57.7226454312 +10 32 53.944450872   15.3       ~ 52 0
56 MCG+06-28-032 bCG 12 48 41.0103678336 +34 28 39.492152544   15.5       ~ 45 0
57 IC 3940 GiC 12 58 16.4611315056 +35 50 20.066833716   16       ~ 14 0
58 Z 43-85 AG? 12 58 21.1524855000 +04 53 08.390825700   15.3       ~ 34 0
59 Z 160-121 EmG 13 03 28.993 +26 33 02.42   15.5       ~ 112 0
60 Z 160-161 GiC 13 12 25.8501153608 +28 32 15.689390875   15.7       ~ 34 0
61 Z 16-24 Sy2 13 13 52.3987020408 +02 07 57.335104416   16.65 16.09     ~ 27 0
62 Z 44-51 Sy2 13 16 59.80967 +05 39 24.9590   15.5       ~ 27 0
63 Z 44-70 AG? 13 19 57.8701196472 +05 48 28.344336516   15.3       ~ 34 0
64 IC 883 SBG 13 20 35.37960 +34 08 21.8400   14.8       ~ 421 1
65 Z 44-80 G 13 24 09.6342139680 +05 15 35.191594908   15.4       ~ 22 0
66 Z 190-4 H2G 13 24 20.128 +36 35 45.86   14.6       ~ 35 0
67 MCG+06-30-008 GiC 13 25 36.3392728392 +36 22 52.483335528   16.5       ~ 17 0
68 Mrk 789 AGN 13 32 24.240 +11 06 22.59   15.41 14.87     ~ 123 0
69 Z 131-33 LIN 13 44 24.5161481784 +20 24 34.342490880   15.0       ~ 34 0
70 Mrk 795 LIN 13 46 13.04964 +23 05 02.5015   16.5       ~ 27 0
71 Z 73-88 LIN 13 51 59.4120214824 +13 58 03.231945120   15.6       ~ 20 0
72 LEDA 3091159 G 13 57 01.1778725952 +11 36 41.237351640           ~ 15 0
73 SDSS J140447.40+363627.3 EmG 14 04 47.4083800560 +36 36 27.488721600   16.3       ~ 10 0
74 LEDA 4571502 G 14 05 46.13608 +25 09 53.9673           ~ 3 0
75 Z 74-129 Sy2 14 10 41.3427501312 +13 33 28.917149112   15.54 14.6     ~ 73 0
76 NGC 5591 H2G 14 22 33.267 +13 43 01.66   14.5       ~ 53 0
77 IC 4414 IG 14 23 42.2520698928 +28 20 45.942259272           ~ 18 0
78 MCG+06-32-056 rG 14 31 21.19968 +35 37 21.8856   15.74 14.85 14.61 13.67 ~ 39 1
79 IC 1034 rG 14 37 13.722 +14 39 54.79   15.6       ~ 25 0
80 NGC 5711 rG 14 39 22.386 +19 59 26.67   15.1       ~ 37 0
81 Z 134-28 LIN 14 44 44.2232927928 +22 26 16.869392520   15.4       ~ 17 0
82 LEDA 2073917 G 15 00 49.7709225504 +36 02 06.294759504           ~ 10 0
83 Z 48-93 G 15 02 29.3136980856 +05 32 41.831149596   15.5       ~ 13 0
84 NVSS J150517+080910 rG 15 05 17.9262118968 +08 09 13.171835556   15.96       ~ 24 0
85 Z 135-27 G 15 12 02.205 +21 17 54.10   15.6       ~ 49 0
86 Z 106-23 rG 15 15 48.331 +20 01 20.81   15.6       ~ 31 0
87 LEDA 1480181 G 15 16 16.55890 +15 16 33.1786           ~ 10 0
88 Z 77-59 GiG 15 17 01.2765019656 +13 06 11.278122840   15.2       ~ 18 0
89 Z 77-94 G 15 22 54.80340 +08 20 56.1999   15.7       ~ 10 0
90 SDSS J153410.31+232958.6 G 15 34 10.333 +23 29 58.62           ~ 3 0
91 LEDA 1986234 G 15 35 21.5789772672 +32 13 00.422325948           ~ 7 0
92 LEDA 1299681 G 15 35 58.8815306880 +06 22 57.279439488           ~ 6 0
93 NVSS J153601+253301 rG 15 36 01.465 +25 33 03.70           ~ 14 0
94 Z 50-82 Sy2 15 43 27.0331830024 +07 54 41.933495556   15.5       ~ 32 0
95 Z 107-30 G 15 43 31.6730676240 +17 18 46.385449704   15.5       ~ 13 0
96 Z 166-63 LIN 15 50 18.5535883680 +28 48 42.710041368   15.5       ~ 25 0
97 MCG+05-38-003 AG? 15 56 30.914 +28 26 14.33   15       ~ 10 0
98 LEDA 1614726 G 15 57 32.1970267824 +20 03 12.451555656           ~ 4 0
99 Z 108-45 AGN 16 00 51.4939034952 +15 09 04.582240164   15.4       ~ 26 0
100 Z 79-36 H2G 16 04 36.939 +09 57 11.44   15.7       ~ 28 0
101 LEDA 3090894 G 16 07 18.223 +13 13 40.96           ~ 10 0
102 LEDA 1675939 G 16 14 12.5607717912 +22 46 39.578240820           ~ 6 0
103 2MASX J16143366+3656378 AG? 16 14 33.6500905176 +36 56 37.580535780           ~ 9 0
104 Z 138-6 AGN 16 23 58.8022238760 +22 23 36.035432772   15.0       ~ 45 0
105 LEDA 1690186 G 16 28 32.89150 +23 35 53.8890           ~ 5 0
106 Z 138-59 EmG 16 42 23.738 +25 05 09.34   15.40       ~ 57 0
107 LEDA 2817030 G 16 53 22.1509136400 +33 01 42.388296348           ~ 13 0

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