1999ApJ...512L..99G

Query : 1999ApJ...512L..99G

1999ApJ...512L..99G - Astrophys. J., 512, L99-L103 (1999/February-3)

Molecular gas depletion and starbursts in luminous infrared galaxy mergers.

GAO Y. and SOLOMON P.M.

Abstract (from CDS):

Most luminous infrared galaxies (LIGs) are closely interacting/merging systems that are rich in molecular gas. Here we study the relationship between the stage of the galaxy-galaxy interactions, the molecular gas mass, and the star formation rate as deduced from the infrared luminosity LIR in LIGs. We find a correlation between the CO (1-0) luminosity [a measure of molecular mass M(H2)] and the projected separation of merger nuclei (the indicator of merging stages) in a sample of 50 LIG mergers, which shows that the molecular gas content decreases as merging advances. The starburst is due to enhanced star formation in preexisting molecular clouds and not to the formation of more molecular clouds from atomic gas. Because of the starbursts, the molecular content is being rapidly depleted as merging progresses. This is further supported by an anticorrelation between LIR/M(H2), the global measure of the star formation rate per unit gas mass, and the projected separation that implies an enhanced star formation ``efficiency'' in late-stage mergers compared with that of early mergers. This is the first evidence connecting the depletion of molecular gas with starbursts in interacting galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Evolution - Galaxies: Interactions - Galaxies: ISM - Galaxies: Nuclei - Galaxies: Starburst - Infrared: Galaxies

CDS comments: T.1 4C 12.5 misprint for 4C 12.50 = IRAS 13451+1232

Simbad objects: 58

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Number of rows : 58
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 NPM1G +40.0002 Sy2 00 08 20.3675391072 +40 37 55.922085984     16.8     ~ 47 0
2 2MASX J00212652-0839261 LIN 00 21 26.5135306416 -08 39 25.967117268   18.37       ~ 124 1
3 Mrk 551B GiP 00 29 24.9816084288 +30 33 33.842999232   14.8       ~ 30 0
4 Mrk 551 PaG 00 29 25.3 +30 33 27   14.8       ~ 34 0
5 Mrk 551A GiP 00 29 25.6 +30 33 25           ~ 19 0
6 IC 1623 IG 01 07 47.24 -17 30 25.0   15       ~ 338 2
7 MCG-03-04-014 Sy1 01 10 08.92440 -16 51 09.7668   15   13.96   ~ 117 1
8 ZW III 35 Sy2 01 44 30.516 +17 06 09.18   15.24 14.81     ~ 261 1
9 IC 214 AGN 02 14 05.53344 +05 10 23.8692   14.4       ~ 157 0
10 2MASX J02513583+4315117 LIN 02 51 35.8187772168 +43 15 11.772126504   18.09 17.36     ~ 60 0
11 UGC 2369 PaG 02 54 00.9 +14 58 31   14.6       ~ 118 1
12 MCG+02-08-029 AGN 02 54 01.80480 +14 58 14.6244           ~ 107 1
13 IRAS 03359+1523 G 03 38 47.1918750504 +15 32 53.853117504   16.3       ~ 112 0
14 IRAS 03521+0028 AGN 03 54 42.14640 +00 37 03.3280           ~ 104 0
15 2MASX J04260482+1443360 LIN 04 26 04.829 +14 43 36.01           ~ 28 1
16 2MASX J05034336+8533558 Sy2 05 03 43.5440435904 +85 33 55.309698936     19.7     ~ 6 0
17 LEDA 89499 Sy2 06 02 53.95560 -71 03 10.1448   15.6       ~ 107 1
18 LEDA 89500 Sy2 06 21 01.17192 -63 17 23.6616   16.70   15.27   ~ 79 1
19 IRAS 08572+3915 LIN 09 00 25.38288 +39 03 54.2988     16.66     ~ 450 1
20 UGC 4881 IG 09 15 55.5 +44 19 58   14.9       ~ 178 0
21 IC 2545 Sy1 10 06 04.581 -33 53 05.55   15.27 14.27 14.25   ~ 117 0
22 Z 240-8 rG 10 06 45.874 +48 37 43.34   15.7       ~ 33 0
23 IRAS 10190+1322 PaG 10 21 42.718 +13 06 55.36           ~ 88 0
24 2MASS J10214273+1306556 LIN 10 21 42.8040022344 +13 06 55.957660596   17.51       ~ 87 0
25 IRAS 10565+2448 LIN 10 59 18.12811 +24 32 34.7357   15.7       ~ 302 0
26 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 1015 4
27 NGC 3690B GiP 11 28 31.02 +58 33 40.7   11.8       ~ 635 4
28 NGC 3690NE AGN 11 28 33.07 +58 33 54.2   11.8       ~ 635 4
29 IRAS 11506+1331 rG 11 53 14.22000 +13 14 27.6400   17.77       ~ 67 0
30 Z 316-8 Sy1 13 01 16.5987722472 +65 00 03.847509324   15.2       ~ 22 0
31 MCG-04-31-023 Sy1 13 02 52.3177169808 -23 55 17.932558692   14.77 14.78 13.24 13.59 ~ 131 1
32 LEDA 165612 LIN 13 13 14.67816 -09 38 08.6352       21.40   ~ 25 0
33 Z 294-28 GiG 13 15 30.7370784024 +62 07 45.311082744   14.4       ~ 110 1
34 MCG+10-19-056 AGN 13 15 35.103 +62 07 28.43   15       ~ 120 1
35 NGC 5256 PaG 13 38 17.81 +48 16 41.2   14.1 13.42     ~ 449 1
36 PKS 1345+12 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 652 2
37 Z 103-14 Sy2 13 56 02.89833 +18 22 18.2982   14.8 14.22     ~ 413 2
38 IC 4395 Sy2 14 17 21.083 +26 51 26.46   15.1       ~ 104 0
39 LEDA 52270 Sy1 14 37 38.2867288488 -15 00 24.087592692   16.58 16.40     ~ 300 2
40 UGC 9618 IG 14 57 01.0 +24 36 41           ~ 127 0
41 NVSS J150440+482350 rG 15 04 40.9290619800 +48 23 49.822205028           ~ 13 0
42 Z 221-50 SyG 15 18 06.1187 +42 44 45.086   15.0 15     ~ 239 1
43 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 446 1
44 IC 1221 GiP 16 34 41.6190786312 +46 23 31.512219648   14.40       ~ 42 1
45 IRAS 16487+5447 LIN 16 49 46.9430396033 +54 42 35.317832914   17.5       ~ 68 1
46 NVSS J171420+531028 rG 17 14 20.4740967144 +53 10 31.495916892           ~ 97 1
47 LEDA 60189 LIN 17 23 21.96264 -00 17 00.8088   15.1       ~ 454 0
48 NGC 6670 PaG 18 33 35.45 +59 53 19.7           ~ 70 1
49 2MASX J18333768+5953227 IG 18 33 37.683 +59 53 22.76           ~ 77 0
50 NAME Super Antennae Sy2 19 31 21.4272801984 -72 39 21.442847832   17.39 16.37 14.65   ~ 318 3
51 NVSS J193222-040000 rG 19 32 22.2962473608 -04 00 01.797249204   18.85   17.04   ~ 122 0
52 2MASX J20040339-2343536 Sy2 20 04 03.4210792440 -23 43 53.867974584   17.96 16.91 15.75   ~ 17 0
53 Z 448-20 G 20 57 23.62800 +17 07 44.5980   15.2       ~ 190 0
54 ESO 286-19 LIN 20 58 26.8183783008 -42 38 59.411838156   14.79 14.79 14.20   ~ 318 0
55 NAME South America rG 22 51 49.27872 -17 52 24.0600   16.97       ~ 348 3
56 ESO 148-2 Sy2 23 15 46.76280 -59 03 15.6924   14.94 14.73 13.95   ~ 289 1
57 NGC 7592W Sy2 23 18 21.8077569718 -04 24 56.904279971     15.0     ~ 175 0
58 NGC 7592 IG 23 18 22.2 -04 24 57           ~ 177 0

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