2018ApJS..237....2Z

Query : 2018ApJS..237....2Z

2018ApJS..237....2Z - Astrophys. J., Suppl. Ser., 237, 2-2 (2018/July-0)

H I observations of major-merger pairs at z = 0: atomic gas and star formation.

ZUO P., XU C.K., YUN M.S., LISENFELD U., LI D. and CAO C.

Abstract (from CDS):

We present a study of the H I gas content of a large K-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR) that were observed by Herschel. We obtained the 21 cm H I fine-structure emission-line data for a total of 70 pairs from this sample, by observing 58 pairs using the Green Bank Telescope (GBT) and retrieving the H I data for an addition 12 pairs from the literature. In this H I sample, 34 pairs are spiral-spiral (S+S) pairs, and 36 are spiral-elliptical (S+E) pairs. Based on these data, we studied the H I-to-stellar mass ratio, the H I gas fraction, and the H I star formation efficiency (SFE_H I_ = star-formation-rate/M_H I_) and searched for differences between S+S and S+E pairs, as well as between pairs with and without signs of merger/interaction. Our results showed that the mean H I-to-stellar mass ratio of spirals in these pairs is =7.6 ± 1.0%, consistent with the average H I gas fraction of spiral galaxies in general. The differences in the H I gas fraction between spirals in S+S and in S+E pairs, and between spirals in pairs with and without signs of merger/interaction, are insignificant (<1σ). On the other hand, the mean SFE_H I_ of S+S pairs is ∼4.6x higher than that of S+E pairs. This difference is very significant (∼4σ) and is the main result of our study. There is no significant difference in the mean SFE_H I_ between galaxies with and without signs of merger/interaction. The mean SFE_H I_ of the whole pair sample is 10–9.55±0.09 yr–1, corresponding to a H I consumption time of 3.5 ± 0.7 Gyr.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: evolution - galaxies: interactions - stars: formation

Simbad objects: 77

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Number of rows : 77
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 KPAIR J0020+0049 PaG 00 20 26.6 +00 49 48           ~ 6 0
2 KPAIR J0118-0013 PaG 01 18 35.3 -00 13 51   15.1       ~ 15 0
3 KPAIR J0211-0039 PaG 02 11 07.36 -00 39 18.2           ~ 7 0
4 NGC 894 Sy2 02 21 36.470 -05 31 17.02 12.21 12.26 11.73     ~ 163 2
5 KPAIR J0338+0109 PaG 03 38 12.6 +01 09 55           ~ 5 0
6 KPAIR J0754+1648 PaG 07 54 32.1 +16 48 28           ~ 5 0
7 KPAIR J0808+3854 PaG 08 08 34.7 +38 54 53           ~ 3 0
8 IRAS 08206+2130 PaG 08 23 33.4 +21 20 34           ~ 7 0
9 KPAIR J0829+5531 PaG 08 29 17.85 +55 31 15.0           ~ 7 0
10 [WLH2009] 115 PaG 08 36 45.4 +47 22 15           ~ 3 0
11 [PA2008] 129.573312+30.91486 PaG 08 38 17.8 +30 54 57           ~ 4 0
12 [WLH2009] 121 PaG 08 39 00.5 +36 13 10           ~ 4 0
13 [WLH2009] 131 PaG 08 41 50.1 +26 42 53           ~ 3 0
14 NGC 2718 AGN 08 58 50.468 +06 17 34.78   14.97 14.24     ~ 102 1
15 KPAIR J0906+5144 PaG 09 06 03.8 +51 44 24           ~ 4 0
16 KPAIR J0912+3547 PaG 09 12 36.6 +35 47 32           ~ 2 0
17 APG 142 PaG 09 37 44.6 +02 45 15           ~ 31 0
18 NGC 3027 AG? 09 55 40.631 +72 12 12.84   12.3       ~ 121 0
19 KPAIR J1022+3446 PaG 10 22 56.5 +34 46 52           ~ 2 0
20 KPAIR J1023+4220 PaG 10 23 36.7 +42 20 56           ~ 3 0
21 KPAIR J1027+0114 PaG 10 27 29.5 +01 15 03           ~ 4 0
22 KPAIR J1032+5306 PaG 10 32 53.2 +53 06 51           ~ 2 0
23 KPAIR J1033+4404 PaG 10 33 30.7 +44 04 28           ~ 2 0
24 KPAIR J1036+5447 PaG 10 36 43.4 +54 47 42           ~ 2 0
25 [PA2008] 159.847442+39.08061 PaG 10 39 24.3 +39 04 54           ~ 3 0
26 KPAIR J1043+0645 PaG 10 43 51.6 +06 45 36           ~ 5 0
27 KPAIR J1045+3910 PaG 10 45 24.9 +39 10 10           ~ 3 0
28 NGC 3406 PaG 10 51 43.7 +51 01 19   13.7       ~ 29 0
29 [WLH2009] 349 PaG 10 59 58.9 +08 57 29           ~ 3 0
30 KPAIR J1101+5720 PaG 11 01 43.6 +57 20 20           ~ 2 0
31 KPAIR J1106+4751 PaG 11 06 50.1 +47 51 10           ~ 2 0
32 KPAIR J1120+0028 PaG 11 20 47.3 +00 28 11           ~ 3 0
33 KPAIR J1125+0226 PaG 11 25 17.1 +02 26 55           ~ 2 0
34 KPAIR J1127+3604 PaG 11 27 33.35 +36 03 57.7           ~ 4 0
35 KPAIR J1144+3332 PaG 11 44 03.8 +33 32 20           ~ 3 0
36 [PA2008] 177.555563+37.76966 PaG 11 50 13.7 +37 46 21           ~ 3 0
37 KPAIR J1154+4932 PaG 11 54 23.0 +49 32 48           ~ 2 0
38 [PA2008] 180.517927+53.70877 PaG 12 02 04.8 +53 42 40           ~ 4 0
39 KPAIR J1243+4405 PaG 12 43 39.1 +44 05 52           ~ 3 0
40 [WLH2009] 588 PaG 12 52 51.1 +46 45 28           ~ 3 0
41 KPAIR J1301+4803 PaG 13 01 17.5 +48 03 33           ~ 3 0
42 KPAIR J1308+0422 PaG 13 08 28.6 +04 22 09           ~ 3 0
43 KPAIR J1313+3910 PaG 13 13 14.5 +39 10 37           ~ 2 0
44 UGC 8327 PaG 13 15 15.73 +44 24 27.0           ~ 19 0
45 UGC 8335 PaG 13 15 32.5 +62 07 37           ~ 70 0
46 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
47 [PA2008] 203.230301-03.02635 PaG 13 32 55.9 -03 01 37           ~ 5 0
48 KPAIR J1346-0325 PaG 13 46 21.11 -03 25 23.1           ~ 8 0
49 KPAIR J1400-0254 PaG 14 00 37.3 -02 54 28           ~ 2 0
50 KPAIR J1400+4251 PaG 14 00 58.3 +42 51 02           ~ 5 0
51 KPAIR J1405+6542 PaG 14 05 52.1 +65 42 44           ~ 3 0
52 KPAIR J1406+5043 PaG 14 06 31.74 +50 43 26.9           ~ 10 0
53 [PA2008] 211.779296-02.58092 PaG 14 07 07.1 -02 34 46           ~ 3 0
54 KPAIR J1423+3400 PaG 14 23 44.28 +34 00 46.0           ~ 5 0
55 KPAIR J1424-0304 PaG 14 24 58.7 -03 04 00           ~ 2 0
56 KPAIR J1425+0313 PaG 14 25 06.5 +03 13 58           ~ 4 0
57 KPAIR J1433+4004 PaG 14 33 47.61 +40 05 15.3           ~ 6 0
58 KPAIR J1444+1207 PaG 14 44 20.75 +12 07 49.1           ~ 6 0
59 KPAIR J1500+4317 PaG 15 00 24.4 +43 17 05           ~ 3 0
60 SBSG 1509+583 PaG 15 10 16.8 +58 10 40           ~ 7 0
61 KPAIR J1523+3748 PaG 15 23 38.4 +37 48 44           ~ 3 0
62 [PA2008] 231.698953+59.26291 PaG 15 26 48.3 +59 15 47           ~ 3 0
63 KPAIR J1528+4255 PaG 15 28 14.6 +42 56 13           ~ 4 0
64 Z 78-63 AG? 15 45 43.965 +12 30 38.07   15.7       ~ 45 0
65 KPAIR J1552+4620 PaG 15 52 33.3 +46 20 21           ~ 2 0
66 KPAIR J1556+4757 PaG 15 56 24.7 +47 57 24           ~ 4 0
67 KPAIR J1558+3227 PaG 15 58 37.7 +32 27 42           ~ 3 0
68 KPAIR J1602+4111 PaG 16 02 43.7 +41 11 55           ~ 5 0
69 KPAIR J1608+2328 PaG 16 08 23.1 +23 28 35           ~ 4 0
70 [WLH2009] 1058 PaG 16 14 54.2 +37 11 10           ~ 3 0
71 NGC 6140 AG? 16 20 58.162 +65 23 25.98   12.6       ~ 122 0
72 KPAIR J1635+2630 PaG 16 35 43.3 +26 30 50           ~ 2 0
73 KPAIR J1637+4650 PaG 16 37 26.7 +46 50 11           ~ 2 0
74 W 20 Rad 16 51.3 +04 59           ~ 7 0
75 KPAIR J1702+1859 PaG 17 02 03.5 +18 59 55           ~ 2 0
76 [PA2008] 256.212001+34.81472 PaG 17 04 50.9 +34 48 58           ~ 5 0
77 KPG 548 PaG 20 47 21.7 +00 18 39           ~ 9 0

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