2004ApJ...612L..29B

Query : 2004ApJ...612L..29B

2004ApJ...612L..29B - Astrophys. J., 612, L29-L32 (2004/September-1)

The role of pressure in giant molecular cloud formation.

BLITZ L. and ROSOLOWSKY E.

Abstract (from CDS):

We examine the hypothesis that hydrostatic pressure alone determines the ratio of atomic to molecular gas averaged over a particular radius in disk galaxies. The hypothesis implies that the transition radius, the location where the ratio is unity, should always occur at the same value of stellar surface density in all galaxies. We examine data for 28 galaxies and find that the stellar surface density at the transition radius is indeed constant to within 40% at a value of 120 M☉/pc2. If the hypothesis can be confirmed at all radii within a large range of galaxy types and metallicities, combining it with the observed relation between the star formation rate and H2surface density may enable us to derive a physically motivated star formation prescription with wide applicability.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: ISM - Galaxies: Structure - ISM: Clouds - ISM: Molecules - Molecular Processes

Simbad objects: 29

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Number of rows : 29
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 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
2 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1
3 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
4 IC 342 AGN 03 46 48.514 +68 05 45.98   10.5       ~ 1579 1
5 NGC 2903 AGN 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1204 3
6 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 777 0
7 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
8 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 862 1
9 NGC 3521 EmG 11 05 48.5680991376 -00 02 09.245076540 10.06 9.83 9.02 10.1 9.6 ~ 879 2
10 M 66 AGN 11 20 15.0 +12 59 29 9.85 9.65 8.92     ~ 1509 4
11 NGC 3726 G 11 33 21.1367545656 +47 01 45.280222428   11.11   10.02   ~ 374 0
12 NGC 3938 GiG 11 52 49.4335936248 +44 07 14.697085116 10.80 10.90 10.38     ~ 566 1
13 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2270 1
14 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
15 M 61 Sy2 12 21 54.9282582888 +04 28 25.597367184 10.07 10.18 9.65     ~ 1084 1
16 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1963 2
17 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 679 0
18 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 953 1
19 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2
20 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
21 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 1010 2
22 NGC 5005 LIN 13 10 56.312 +37 03 32.19   14.67 13.67     ~ 567 2
23 NGC 5033 Sy2 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 909 1
24 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1292 2
25 NGC 5248 G 13 37 32.0145074088 +08 53 06.496982448   11.4       ~ 554 0
26 NGC 5247 EmG 13 38 03.0183262176 -17 53 02.645511252   10.77   9.96 10.5 ~ 228 0
27 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
28 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
29 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1284 2

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