2016ApJ...821..125F

Query : 2016ApJ...821..125F

2016ApJ...821..125F - Astrophys. J., 821, 125-125 (2016/April-3)

Resolving giant molecular clouds in NGC 300: a first look with the submillimeter array.

FAESI C.M., LADA C.J. and FORBRICH J.

Abstract (from CDS):

We present the first high angular resolution study of giant molecular clouds (GMCs) in the nearby spiral galaxy NGC 300, based on observations from the Submillimeter Array (SMA). We target eleven 500 pc sized regions of active star formation within the galaxy in the 12CO(J = 2-1) line at 40 pc spatial and 1 km s-1 spectral resolution and identify 45 individual GMCs. We characterize the physical properties of these GMCs, and find that they are similar to GMCs in the disks of the Milky Way and other nearby spiral galaxies. For example, the GMC mass spectrum in our sample has a slope of 1.80 ± 0.07. Twelve clouds are spatially resolved by our observations, of which ten have virial mass estimates that agree to within a factor of two with mass estimates derived directly from 12CO integrated intensity, suggesting that the majority of these GMCs are bound. The resolved clouds show consistency with Larson's fundamental relations between size, linewidth, and mass observed in the Milky Way. We find that the linewidth scales with the size as ΔV ∝ R0.52±0.20, and the median surface density in the subsample is 54 M☉ pc-2. We detect 13CO in four GMCs and find a mean 12CO/13CO flux ratio of 6.2. Our interferometric observations recover between 30% and 100% of the integrated intensity from the APEX single dish 12CO observations of Faesi et al., suggesting the presence of low-mass GMCs and/or diffuse gas below our sensitivity limit. The fraction of APEX emission recovered increases with the SMA total intensity, as well as with the star formation rate.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: NGC 300 - galaxies: ISM - ISM: clouds - ISM: molecules - radio lines: galaxies - techniques: interferometric

VizieR on-line data: <Available at CDS (J/ApJ/821/125): table1.dat table3.dat>

Nomenclature: Table 3: [FLF2016] DCLNNNA-N N=45 among (Nos DCL23-1 to DCL137-6).

Simbad objects: 66

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Number of rows : 66
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12645 1
2 [FLF2016] DCL23-2 MoC 00 54 27.48 -37 41 59.8           ~ 2 0
3 [FLF2016] DCL23-1 MoC 00 54 28.31 -37 41 52.2           ~ 2 0
4 [DCL88] 23 HII 00 54 28.36 -37 41 48.3           ~ 4 0
5 [FLF2016] DCL41-5 MoC 00 54 36.79 -37 41 29.0           ~ 1 0
6 [FLF2016] DCL41-6 MoC 00 54 36.88 -37 41 32.4           ~ 1 0
7 [FLF2016] DCL41-4 MoC 00 54 38.71 -37 41 25.9           ~ 1 0
8 [DCL88] 41 HII 00 54 38.75 -37 41 23.5           ~ 5 0
9 [FLF2016] DCL41-3 MoC 00 54 39.33 -37 41 20.3           ~ 2 0
10 [FLF2016] DCL41-7 MoC 00 54 39.38 -37 41 38.1           ~ 2 0
11 [FLF2016] DCL41-2 MoC 00 54 39.83 -37 41 18.1           ~ 1 0
12 [FLF2016] DCL41-1 MoC 00 54 40.11 -37 41 17.6           ~ 1 0
13 [FLF2016] DCL52-1 MoC 00 54 41.92 -37 40 19.4           ~ 2 0
14 [FLF2016] DCL52-3 MoC 00 54 42.43 -37 39 49.0           ~ 1 0
15 [FLF2016] DCL52-2 MoC 00 54 42.45 -37 40 15.2           ~ 2 0
16 [BL97] N300-H11 HII 00 54 42.89 -37 40 01.5     17.13     ~ 7 1
17 [FLF2016] DCL69-3 MoC 00 54 46.76 -37 43 13.7           ~ 1 0
18 [FLF2016] DCL69-1 MoC 00 54 47.97 -37 43 30.5           ~ 1 0
19 [DCL88] 69 HII 00 54 48.11 -37 43 31.3           ~ 5 0
20 [FLF2016] DCL69-2 MoC 00 54 48.24 -37 43 38.2           ~ 1 0
21 [FLF2016] DCL76C-1 MoC 00 54 48.94 -37 40 28.0           ~ 1 0
22 [FLF2016] DCL79-2 MoC 00 54 50.06 -37 38 20.2           ~ 1 0
23 [FLF2016] DCL76C-2 MoC 00 54 50.30 -37 40 38.2           ~ 2 0
24 [FLF2016] DCL76C-3 MoC 00 54 50.37 -37 40 29.3           ~ 2 0
25 [FLF2016] DCL79-1 MoC 00 54 50.48 -37 38 18.5           ~ 1 0
26 [FLF2016] DCL76C-5 MoC 00 54 50.72 -37 40 16.7           ~ 2 0
27 [FLF2016] DCL76C-6 MoC 00 54 50.85 -37 40 24.4           ~ 2 0
28 [DCL88] 76C HII 00 54 50.89 -37 40 23.6           ~ 4 0
29 [PFP2004] J005451.1-373826 HII 00 54 51.15 -37 38 22.8     18.01     ~ 10 1
30 [FLF2016] DCL79-3 MoC 00 54 51.35 -37 38 22.5           ~ 1 0
31 [FLF2016] DCL76C-4 MoC 00 54 51.52 -37 40 27.5           ~ 1 0
32 [FLF2016] DCL79-6 MoC 00 54 51.69 -37 38 39.3           ~ 2 0
33 [FLF2016] DCL79-7 MoC 00 54 51.70 -37 38 30.1           ~ 2 0
34 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1502 2
35 [FLF2016] DCL114-5 MoC 00 55 01.11 -37 39 31.2           ~ 1 0
36 [FLF2016] DCL114-6 MoC 00 55 01.66 -37 39 31.4           ~ 1 0
37 [FLF2016] DCL119C-4 MoC 00 55 02.06 -37 43 14.1           ~ 1 0
38 [FLF2016] DCL114-7 MoC 00 55 02.06 -37 39 41.6           ~ 2 0
39 [FLF2016] DCL119C-5 MoC 00 55 02.08 -37 43 30.2           ~ 1 0
40 [DCL88] 114 HII 00 55 02.2 -37 39 42           ~ 3 0
41 [FLF2016] DCL114-3 MoC 00 55 02.40 -37 39 56.1           ~ 2 0
42 [FLF2016] DCL114-2 MoC 00 55 02.44 -37 39 52.2           ~ 1 0
43 [DCL88] 119C HII 00 55 02.87 -37 43 13.2           ~ 6 0
44 [FLF2016] DCL119C-2 MoC 00 55 03.58 -37 43 24.1           ~ 1 0
45 [FLF2016] DCL119C-3 MoC 00 55 03.78 -37 43 27.6           ~ 2 0
46 [FLF2016] DCL119C-1 MoC 00 55 03.85 -37 42 52.8           ~ 2 0
47 [FLF2016] DCL127-4 MoC 00 55 06.83 -37 41 35.7           ~ 2 0
48 [FLF2016] DCL127-3 MoC 00 55 07.09 -37 41 45.6           ~ 2 0
49 [DCL88] 127 HII 00 55 07.53 -37 41 47.8           ~ 8 0
50 [FLF2016] DCL127-2 MoC 00 55 07.95 -37 41 42.6           ~ 2 0
51 [FLF2016] DCL127-1 MoC 00 55 08.93 -37 41 41.7           ~ 2 0
52 [FLF2016] DCL137-1 MoC 00 55 10.92 -37 41 34.8           ~ 1 0
53 [FLF2016] DCL137-4 MoC 00 55 11.59 -37 41 16.3           ~ 2 0
54 [FLF2016] DCL137-6 MoC 00 55 12.34 -37 41 18.1           ~ 1 0
55 [DCL88] 137B HII 00 55 12.70 -37 41 23.1           ~ 9 0
56 [FLF2016] DCL137-3 MoC 00 55 12.80 -37 41 25.4           ~ 1 0
57 [DCL88] 137C HII 00 55 13.86 -37 41 36.9     15.34     ~ 10 0
58 [FLF2016] DCL137-2 MoC 00 55 13.96 -37 41 31.5           ~ 1 0
59 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5838 1
60 ICRF J013738.3-243053 Sy1 01 37 38.3462810880 -24 30 53.883832500   17.47 17.33 16.57   ~ 204 1
61 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4008 3
62 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17430 0
63 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4329 4
64 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2847 2
65 ICRF J225805.9-275821 Sy1 22 58 05.96287687 -27 58 21.2567572   17.34 16.77 17.20   ~ 364 1
66 ICRF J233355.2-234340 BLL 23 33 55.2379642584 -23 43 40.660470084   16.45 17 11.21   ~ 172 1

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