2014MNRAS.445.2378D

Query : 2014MNRAS.445.2378D

2014MNRAS.445.2378D - Mon. Not. R. Astron. Soc., 445, 2378-2384 (2014/December-2)

Systematic variation of the 12CO/13CO ratio as a function of star formation rate surface density.

DAVIS T.A.

Abstract (from CDS):

We show that the 12CO/13CO intensity ratio in nearby galaxies varies systematically as a function of the star formation rate surface density (ΣSFR) and gas surface density. The same effect is observed in different transitions, and in the 12CO/C18O ratio, while the 13CO/C18O ratio appears to remain constant as a function of ΣSFR. We discuss the cause of these variations, considering both changes in the physical state of the gas and chemical changes that lead to abundance variations. We used the observed correlations with C18O to suggest that abundance variations are unlikely to be causing the systematic trend observed with ΣSFR, and thus that the mean gas temperature and/or velocity dispersion are systematically higher in higher SFR surface density regions. We present the best-fitting relations between ΣSFR and the 12CO/13CO and 12CO/C18O ratios, and discuss how this effect can help us predict CO isotope emission from galaxies across the known Universe.

Abstract Copyright: © 2014 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): ISM: abundances - ISM: molecules - galaxies: ISM - galaxies: star formation

Simbad objects: 42

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Number of rows : 42
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3332 2
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1666 2
3 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 349 1
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4598 2
5 NGC 1222 Sy2 03 08 56.7398731608 -02 57 18.587969280   13.3   13.0 13.2 ~ 193 0
6 NGC 1266 Sy1 03 16 00.7739640240 -02 25 37.827013584   14   12.46   ~ 305 1
7 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1514 1
8 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 721 3
9 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 720 2
10 NGC 2764 GiG 09 08 17.5023934176 +21 26 36.007547028   13.9       ~ 119 0
11 NGC 3032 AGN 09 52 08.1524118072 +29 14 10.364182440   13.87 13.28     ~ 250 0
12 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5854 6
13 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1390 3
14 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 734 0
15 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 847 2
16 M 108 SBG 11 11 30.967 +55 40 26.84   10.70       ~ 471 1
17 IC 676 GiG 11 12 39.8140774166 +09 03 19.836734750   13.4       ~ 139 0
18 NGC 3593 GiG 11 14 36.9731893800 +12 49 05.497790664   11.8       ~ 359 2
19 [VV2006] J111654.8+180304 QSO 11 16 54.7 +18 03 06   13.84 12.76     ~ 467 0
20 M 66 GiP 11 20 15.0 +12 59 29 9.85 9.65 8.92     ~ 1384 4
21 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 825 3
22 NGC 3665 rG 11 24 43.630 +38 45 46.05 13.71 13.26 11.62     ~ 344 1
23 NGC 3982 Sy1 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 549 1
24 NGC 4150 GiG 12 10 33.655 +30 24 05.35 12.72 12.44 11.64     ~ 310 2
25 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2362 3
26 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6634 0
27 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 939 2
28 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1473 2
29 NGC 5033 Sy2 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 868 3
30 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1223 2
31 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4327 4
32 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2571 2
33 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1213 2
34 IC 1024 GiG 14 31 27.221 +03 00 32.78   13.87       ~ 117 1
35 M 102 SyG 15 06 29.561 +55 45 47.91 11.12 10.74 9.89     ~ 552 3
36 NGC 6014 AG? 15 55 57.4094044224 +05 55 55.125528852   13.8       ~ 96 0
37 Z 52-15 AG? 16 26 04.2968240808 +02 54 23.887533672   15.4       ~ 59 0
38 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2526 2
39 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 528 1
40 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1227 2
41 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2093 3
42 NGC 7552 Sy1 23 16 10.66 -42 35 04.7 11.34 11.22 10.57 10.08 11.1 ~ 552 3

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