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: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NPM1G +40.0002 Sy2 00 08 20.3675391072 +40 37 55.922085984     16.8     ~ 45 0
2 2MASX J00212652-0839261 LIN 00 21 26.5135306416 -08 39 25.967117268   18.37       ~ 114 1
3 NAME IRAS F00267+3016 NW GiP 00 29 24.9816084288 +30 33 33.842999232   14.8       ~ 28 0
4 Mrk 551 PaG 00 29 25.3 +30 33 27   14.8       ~ 32 0
5 NAME IRAS F00267+3016 SE GiP 00 29 25.6 +30 33 25           ~ 18 0
6 IC 1623 IG 01 07 47.380 -17 30 24.51   15       ~ 310 2
7 MCG-03-04-014 Sy1 01 10 08.979 -16 51 09.69   15   13.96   ~ 104 0
8 ZW III 35 Sy2 01 44 30.516 +17 06 09.18   15.24 14.81     ~ 249 0
9 IC 214 G 02 14 05.586 +05 10 23.37   14.4       ~ 149 0
10 2MASX J02513583+4315117 LIN 02 51 35.8187772168 +43 15 11.772126504   18.09 17.36     ~ 56 0
11 UGC 2369 PaG 02 54 00.9 +14 58 31   14.6       ~ 115 1
12 UGC 2369 S GiP 02 54 01.80 +14 58 14.0           ~ 101 1
13 IRAS 03359+1523 G 03 38 47.1918750504 +15 32 53.853117504   16.3       ~ 106 0
14 IRAS 03521+0028 LIN 03 54 42.146 +00 37 03.33           ~ 93 0
15 2MASX J04260482+1443360 LIN 04 26 04.829 +14 43 36.01           ~ 27 0
16 2MASX J05034336+8533558 Sy2 05 03 43.5440435904 +85 33 55.309698936     19.7     ~ 4 0
17 LEDA 89499 Sy2 06 02 54.066 -71 03 10.48   15.6       ~ 94 1
18 LEDA 89500 Sy2 06 21 01.188 -63 17 23.81   16.70   15.27   ~ 68 1
19 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 420 1
20 UGC 4881 IG 09 15 55.5 +44 19 58   14.9       ~ 169 0
21 IC 2545 Sy1 10 06 04.581 -33 53 05.55   15.27 14.27 14.25   ~ 111 0
22 FIRST J100645.8+483741 rG 10 06 45.874 +48 37 43.34   15.7       ~ 30 0
23 3XMM J102142.6+130654 LIN 10 21 42.8040022344 +13 06 55.957660596   17.51       ~ 79 3
24 LEDA 33083 LIN 10 59 18.128 +24 32 34.74   15.7       ~ 274 1
25 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 978 4
26 NAME NGC 3690 West GiP 11 28 31.02 +58 33 40.7   11.8       ~ 629 4
27 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 631 4
28 NVSS J115314+131427 rG 11 53 14.226 +13 14 27.86   17.77       ~ 60 0
29 Mrk 238 Sy1 13 01 16.5987722472 +65 00 03.847509324   15.2       ~ 18 0
30 ESO 507-70 Sy1 13 02 52.3177169808 -23 55 17.932558692   14.77 14.78 13.24 13.59 ~ 121 0
31 LEDA 165612 LIN 13 13 14.5 -09 38 08       21.40   ~ 21 0
32 UGC 8335 W G 13 15 30.7370784024 +62 07 45.311082744   14.4       ~ 106 1
33 UGC 8335 E AGN 13 15 35.103 +62 07 28.43   15       ~ 107 0
34 NGC 5256 PaG 13 38 17.81 +48 16 41.2   14.1 13.42     ~ 430 1
35 ICRF J134733.3+121724 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 597 3
36 Mrk 463 Sy2 13 56 02.9 +18 22 18   14.8 14.22     ~ 390 2
37 IC 4395 Sy2 14 17 21.083 +26 51 26.46   15.1       ~ 99 0
38 LEDA 52270 Sy1 14 37 38.2867288488 -15 00 24.087592692   16.58 16.40     ~ 276 1
39 UGC 9618 IG 14 57 00.4 +24 36 44   14.3       ~ 122 1
40 2MASX J15044099+4823493 G 15 04 40.9290619800 +48 23 49.822205028           ~ 11 0
41 Z 221-50 SyG 15 18 06.1187 +42 44 45.086   15.0 15     ~ 219 1
42 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 430 2
43 IC 1221 GiP 16 34 41.6190786312 +46 23 31.512219648   14.40       ~ 38 1
44 LEDA 90261 LIN 16 49 46.88 +54 42 35.4   17.5       ~ 63 1
45 LEDA 59896 G 17 14 20.4740967144 +53 10 31.495916892           ~ 90 0
46 LEDA 60189 LIN 17 23 21.943 -00 17 00.96   15.1       ~ 424 0
47 NGC 6670 PaG 18 33 35.2 +59 53 21           ~ 66 1
48 2MASX J18333768+5953227 IG 18 33 37.683 +59 53 22.76           ~ 70 0
49 NAME Super Antennae Sy2 19 31 21.4272801984 -72 39 21.442847832   17.39 16.37 14.65   ~ 302 2
50 LEDA 90327 EmG 19 32 22.2962473608 -04 00 01.797249204   18.85   17.04   ~ 110 0
51 2MASX J20040339-2343536 Sy2 20 04 03.4210792440 -23 43 53.867974584   17.96 16.91 15.75   ~ 16 0
52 Z 448-20 G 20 57 23.62800 +17 07 44.5980   15.2       ~ 165 0
53 ESO 286-19 LIN 20 58 26.8183783008 -42 38 59.411838156   14.79 14.79 14.20   ~ 291 0
54 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 327 3
55 ESO 148-2 Sy2 23 15 46.772 -59 03 15.94   14.94 14.73 13.95   ~ 265 1
56 NGC 7592 Sy2 23 18 22.0 -04 24 57           ~ 160 0

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