2019A&A...627A.107L

Query : 2019A&A...627A.107L

2019A&A...627A.107L - Astronomy and Astrophysics, volume 627A107-107 (2019/7-1)

CO observations of major merger pairs at z = 0: molecular gas mass and star formation.

LISENFELD U., XU C.K., GAO Y., DOMINGUE D.L., CAO C., YUN M.S. and ZUO P.

Abstract (from CDS):

We present CO observations of 78 spiral galaxies in local merger pairs. These galaxies represent a subsample of a Ks-band-selected sample consisting of 88 close major-merger pairs (HKPAIRs), 44 spiral-spiral (S+S) pairs, and 44 spiral-elliptical (S+E) pairs, with separation <20h–1kpc and mass ratio <2.5. For all objects, the star formation rate (SFR) and dust mass were derived from Herschel PACS and SPIRE data, and the atomic gas mass, MHI, from the Green Bank Telescope HI observations. The complete data set allows us to study the relation between gas (atomic and molecular) mass, dust mass, and SFR in merger galaxies. We derive the molecular gas fraction (MH2/M*), molecular-to-atomic gas mass ratio (MH2/MHI), gas-to-dust mass ratio and SFE (= SFR/MH2) and study their dependences on pair type (S+S compared to S+E), stellar mass, and the presence of morphological interaction signs. We find an overall moderate enhancement (∼2x) in both molecular gas fraction (MH2/M*) and molecular-to-atomic gas ratio (MH2/MHI) for star-forming galaxies in major-merger pairs compared to non-interacting comparison samples, whereas no enhancement was found for the SFE nor for the total gas mass fraction ((MHI+MH2)/M*). When divided into S+S and S+E, low mass and high mass, and with and without interaction signs, there is a small difference in SFE, a moderate difference in MH2/M*, and a strong difference in MH2/MHI between subsamples. For the molecular-to-atomic gas ratio MH2/MHI, the difference between S+S and S+E subsamples is 0.55±0.18dex and between pairs with and without interaction sign 0.65±0.16dex. Together, our results suggest that (1) star formation enhancement in close major-merger pairs occurs mainly in S+S pairs after the first close encounter (indicated by interaction signs) because the HI gas is compressed into star-forming molecular gas by the tidal torque; and (2) this effect is much weakened in the S+E pairs.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: evolution - galaxies: general - galaxies: interactions - galaxies: starburst - ISM: molecules

VizieR on-line data: <Available at CDS (J/A+A/627/A107): table1.dat table2.dat listco10.dat spco10.fits listco21.dat spco21.fits>

Simbad objects: 131

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Number of rows : 131
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 NGC 78A AGN 00 20 25.8094287120 +00 49 35.057407512   14.5       ~ 65 0
2 KPAIR J0020+0049 PaG 00 20 26.6 +00 49 48           ~ 6 0
3 MCG+00-04-074 rG 01 18 34.1439907008 -00 13 41.783267388   15.5       ~ 26 1
4 KPAIR J0118-0013 PaG 01 18 35.3 -00 13 51   15.1       ~ 15 0
5 MCG+00-04-075 H2G 01 18 35.60475 -00 13 59.1174   16.5       ~ 16 1
6 Z 387-52 Sy2 02 11 06.40909 -00 39 18.3215   14.7       ~ 41 0
7 KPAIR J0211-0039 PaG 02 11 07.36 -00 39 18.2           ~ 7 0
8 LEDA 138655 G 03 38 12.2250466536 +01 10 08.951770596   16       ~ 22 0
9 KPAIR J0338+0109 PaG 03 38 12.6 +01 09 55           ~ 5 0
10 FIRST J075431.9+164822 rG 07 54 31.91712 +16 48 22.6296           ~ 8 0
11 KPAIR J0754+1648 PaG 07 54 32.1 +16 48 28           ~ 5 0
12 Z 87-46 SyG 07 54 32.2193783712 +16 48 35.077359816   14.8       ~ 32 0
13 LEDA 2139492 G 08 08 33.77345 +38 54 53.3819           ~ 16 0
14 KPAIR J0808+3854 PaG 08 08 34.7 +38 54 53           ~ 3 0
15 IC 2338 EmG 08 23 32.6810743032 +21 20 16.898027244   14.7       ~ 70 0
16 IRAS 08206+2130 PaG 08 23 33.4 +21 20 34           ~ 7 0
17 IC 2339 AG? 08 23 34.2173971584 +21 20 51.537659028   14.7       ~ 47 0
18 Z 263-36 G 08 29 14.8953761472 +55 31 22.697720544   15.2       ~ 33 0
19 KPAIR J0829+5531 PaG 08 29 17.85 +55 31 15.0           ~ 7 0
20 Z 263-37 G 08 29 20.8067653488 +55 31 08.202448380   14.9       ~ 24 0
21 FIRST J083817.5+305453 rG 08 38 17.5932426336 +30 54 53.350223544           ~ 16 0
22 [PA2008] 129.573312+30.91486 PaG 08 38 17.8 +30 54 57           ~ 4 0
23 2MASX J08381791+3055013 LIN 08 38 17.9379436776 +30 55 00.922321884           ~ 12 0
24 [WLH2009] 121 PaG 08 39 00.5 +36 13 10           ~ 4 0
25 MCG+06-19-012 G 08 39 01.2515607648 +36 13 04.165701708   17       ~ 9 0
26 KPAIR J0906+5144 PaG 09 06 03.8 +51 44 24           ~ 4 0
27 NGC 2740 G 09 06 04.9814113824 +51 44 07.056194604   15.1       ~ 18 0
28 KPAIR J0913+4742 PaG 09 13 45.3 +47 42 08           ~ 2 0
29 Z 238-23 Sy1 09 13 46.0605692904 +47 42 00.244650492   15.7       ~ 14 0
30 NAME Grasshopper B G 09 15 54.67224 +44 19 51.4524           ~ 21 0
31 UGC 4881 IG 09 15 55.5 +44 19 58   14.9       ~ 178 0
32 KUG 0912+445A AGN 09 15 55.522 +44 19 58.08   14.87 14.42     ~ 63 0
33 NGC 2936 rG 09 37 44.1399551712 +02 45 39.173273352 13.92 13.90 13.06     ~ 60 1
34 APG 142 PaG 09 37 44.6 +02 45 15           ~ 31 0
35 Z 266-26 rG 10 10 00.736 +54 40 20.29   15.6       ~ 27 0
36 KPAIR J1010+5440 PaG 10 10 01.5 +54 40 24           ~ 2 0
37 2MASS J10100211+5440279 G 10 10 02.0950512504 +54 40 27.941735892           ~ 4 0
38 LEDA 1310913 G 10 15 52.5800880480 +06 57 33.060520908           ~ 9 0
39 KPAIR J1015+0657 PaG 10 15 53.0 +06 57 41           ~ 2 0
40 4C 48.29 rG 10 20 51.9148449384 +48 31 09.784797996   16       ~ 40 0
41 KPAIR J1020+4831 PaG 10 20 52.8 +48 31 17           ~ 3 0
42 Z 211-52 G 10 23 36.5883248784 +42 20 47.562634680   15.5       ~ 22 0
43 KPAIR J1023+4220 PaG 10 23 36.7 +42 20 56           ~ 3 0
44 LEDA 3535304 G 10 23 36.84462 +42 21 03.7003           ~ 12 0
45 KPAIR J1027+0114 PaG 10 27 29.5 +01 15 03           ~ 4 0
46 MCG+00-27-019 EmG 10 27 29.5158950616 +01 14 48.374697372   15.28 14.60 14.01 13.35 ~ 39 0
47 NGC 3349 GiG 10 43 50.5576325904 +06 45 46.646142156   15.2       ~ 30 0
48 KPAIR J1043+0645 PaG 10 43 51.6 +06 45 36           ~ 5 0
49 2MASX J10435268+0645256 G 10 43 52.6805025744 +06 45 25.033655484   15.2       ~ 8 0
50 MCG+07-22-058 Sy2 10 45 24.7899810336 +39 10 29.772877476   15       ~ 22 0
51 KPAIR J1045+3910 PaG 10 45 24.9 +39 10 10           ~ 3 0
52 2MASX J11204655+0028145 GiG 11 20 46.5701553000 +00 28 14.197219788   15.33 14.64 14.17 13.58 ~ 20 0
53 KPAIR J1120+0028 PaG 11 20 47.3 +00 28 11           ~ 3 0
54 Z 11-70 LIN 11 20 48.0128282688 +00 28 06.887177184   15.29 14.31 13.68 12.97 ~ 41 0
55 KPAIR J1144+3332 PaG 11 44 03.8 +33 32 20           ~ 3 0
56 LEDA 3775975 GiC 11 44 04.3354434600 +33 32 33.955664712           ~ 8 0
57 Z 13-73 GiG 12 05 40.6599186384 +01 35 36.605931648   15.3   14.564   ~ 36 0
58 KPAIR J1205+0135 PaG 12 05 40.7 +01 35 03           ~ 2 0
59 Z 215-50 rG 12 11 55.0832789520 +40 39 18.270489240   15.0       ~ 22 0
60 KPAIR J1211+4039 PaG 12 11 55.8 +40 39 18           ~ 2 0
61 FIRST J121156.4+403918 rG 12 11 56.4901332576 +40 39 18.410137560   15.0       ~ 13 0
62 KPAIR J1219+1201 PaG 12 19 17.9 +12 01 02           ~ 3 0
63 IC 3147B G 12 19 18.6785680416 +12 01 05.561542236   15.5       ~ 18 0
64 MCG+07-26-043 G 12 43 38.8671582840 +44 05 39.969335328   15       ~ 17 0
65 KPAIR J1243+4405 PaG 12 43 39.1 +44 05 52           ~ 3 0
66 Z 245-12 AGN 13 01 16.636 +48 03 36.67   15.1       ~ 37 0
67 KPAIR J1301+4803 PaG 13 01 17.5 +48 03 33           ~ 3 0
68 Mrk 237SE G 13 01 18.4142856048 +48 03 30.262735440           ~ 12 0
69 MCG+08-24-095 Sy2 13 15 13.8700839624 +44 24 26.466405336           ~ 28 0
70 UGC 8327 PaG 13 15 15.73 +44 24 27.0           ~ 19 0
71 MCG+08-24-096 Sy2 13 15 17.2663982328 +44 24 25.601901516   16.5       ~ 105 0
72 Z 294-28 GiG 13 15 30.7370784024 +62 07 45.311082744   14.4       ~ 110 1
73 UGC 8335 PaG 13 15 32.5 +62 07 37           ~ 70 0
74 MCG+10-19-056 AGN 13 15 35.103 +62 07 28.43   15       ~ 120 1
75 FIRST J133255.2-030134 rG 13 32 55.2598041240 -03 01 34.693033872   16.44   15.39   ~ 16 0
76 [PA2008] 203.230301-03.02635 PaG 13 32 55.9 -03 01 37           ~ 5 0
77 Z 17-18 LIN 13 32 56.5808058504 -03 01 39.583649568   15.1       ~ 23 0
78 MCG+00-35-020 Sy2 13 46 20.0388218808 -03 25 41.209109148   15.280   14.166   ~ 25 0
79 KPAIR J1346-0325 PaG 13 46 21.11 -03 25 23.1           ~ 8 0
80 MCG+07-29-036 AGN 14 00 57.8015500992 +42 51 20.434356648   16       ~ 49 0
81 KPAIR J1400+4251 PaG 14 00 58.3 +42 51 02           ~ 5 0
82 LEDA 2207577 G 14 00 58.824 +42 50 42.71           ~ 14 0
83 MCG+11-17-016 G 14 05 50.7690907440 +65 42 59.948924904   18       ~ 11 0
84 KPAIR J1405+6542 PaG 14 05 52.1 +65 42 44           ~ 3 0
85 NGC 5480 AG? 14 06 21.522 +50 43 29.99   12.6       ~ 224 1
86 KPAIR J1406+5043 PaG 14 06 31.74 +50 43 26.9           ~ 10 0
87 Z 192-11 AG? 14 23 42.385 +34 00 31.98   14.4       ~ 48 0
88 KPAIR J1423+3400 PaG 14 23 44.28 +34 00 46.0           ~ 5 0
89 Z 192-12 Sy2 14 23 46.3338941304 +34 01 01.001271864   15.1       ~ 46 0
90 KPAIR J1425+0313 PaG 14 25 06.5 +03 13 58           ~ 4 0
91 LEDA 1247882 G 14 25 07.3749627480 +03 13 55.380229032           ~ 12 0
92 MCG+06-32-046 AGN 14 29 47.6605244760 +35 34 27.470727876   15.4 14.14 13.81 14.29 ~ 38 0
93 KPAIR J1429+3534 PaG 14 29 49.0 +35 34 20           ~ 2 0
94 Z 192-31 AGN 14 29 50.3293063752 +35 34 12.295694028   15.4   14.28 13.78 ~ 16 0
95 Z 220-29 GiG 14 33 46.8399853416 +40 04 51.033692244   14.77 13.78     ~ 34 0
96 KPAIR J1433+4004 PaG 14 33 47.61 +40 05 15.3           ~ 6 0
97 Z 220-30 GiG 14 33 48.3490001712 +40 05 38.963383908   15.01 14.11     ~ 48 0
98 2MASX J14442068+1207425 EmG 14 44 20.687 +12 07 42.56           ~ 12 0
99 KPAIR J1444+1207 PaG 14 44 20.75 +12 07 49.1           ~ 6 0
100 NGC 5747 GiG 14 44 20.7960184800 +12 07 55.191620928   14.4       ~ 40 0
101 KPAIR J1500+4317 PaG 15 00 24.4 +43 17 05           ~ 3 0
102 MCG+07-31-018 LIN 15 00 25.0042038672 +43 17 13.162246980   15.4       ~ 26 0
103 IC 1087 LIN 15 06 43.8886699992 +03 46 36.618422340   15.1       ~ 26 0
104 KPAIR J1506+0346 PaG 15 06 44.9 +03 46 29           ~ 3 0
105 IC 1087E AGN 15 06 45.8105992224 +03 46 21.475955064   15.1       ~ 33 1
106 SBSG 1509+583A LIN 15 10 15.8490944400 +58 10 42.672345060   16.0       ~ 20 0
107 SBSG 1509+583 PaG 15 10 16.8 +58 10 40           ~ 7 0
108 SBSG 1509+583B G 15 10 17.76867 +58 10 37.5240           ~ 14 0
109 LEDA 3088334 G 15 23 37.6948252032 +37 49 03.062636112           ~ 8 0
110 KPAIR J1523+3748 PaG 15 23 38.4 +37 48 44           ~ 3 0
111 NGC 5934 LIN 15 28 12.7256314392 +42 55 47.533609668   14.5       ~ 69 0
112 KPAIR J1528+4255 PaG 15 28 14.6 +42 56 13           ~ 4 0
113 NGC 5935 LIN 15 28 16.6938591072 +42 56 38.773484448   15.1       ~ 37 0
114 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
115 LEDA 84695 AG? 15 56 21.9020404464 +47 57 17.287635564   15.45       ~ 22 0
116 KPAIR J1556+4757 PaG 15 56 24.7 +47 57 24           ~ 4 0
117 KPAIR J1558+3227 PaG 15 58 37.7 +32 27 42           ~ 3 0
118 NVSS J155838+322745 rG 15 58 37.8263573160 +32 27 47.163573252           ~ 17 0
119 Z 223-30 AGN 16 02 42.5717019456 +41 11 49.877531304   14.5       ~ 68 2
120 KPAIR J1602+4111 PaG 16 02 43.7 +41 11 55           ~ 5 0
121 MCG+07-33-030 G 16 02 44.758 +41 11 58.94   14       ~ 16 0
122 2MASS J16080560+2529092 G 16 08 05.6008514928 +25 29 09.149765928           ~ 3 0
123 KPAIR J1608+2529 PaG 16 08 06.0 +25 29 08           ~ 2 0
124 Z 137-40 rG 16 08 06.5319908352 +25 29 07.547384544   15.7       ~ 15 0
125 Z 137-41 G 16 08 22.577 +23 28 46.76   15.3       ~ 12 0
126 KPAIR J1608+2328 PaG 16 08 23.1 +23 28 35           ~ 4 0
127 MCG+04-38-032 G 16 08 23.5494946680 +23 28 23.850708096   15.3       ~ 21 0
128 KPAIR J1628+4109 PaG 16 28 26.3 +41 09 53           ~ 2 0
129 MCG+07-34-052 LIN 16 28 27.5641573800 +41 09 39.617635788   15.5       ~ 43 0
130 NGC 6962 Sy2 20 47 19.0650209136 +00 19 14.912136624 13.38 13.00 12.14     ~ 151 1
131 KPG 548 PaG 20 47 21.7 +00 18 39           ~ 9 0

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