2020A&A...641A..24W


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET21:22:15

2020A&A...641A..24W - Astronomy and Astrophysics, volume 641A, 24-24 (2020/9-1)

Influence of velocity dispersions on star-formation activities in galaxies.

WANG T.-M. and HWANG C.-Y.

Abstract (from CDS):

We investigated the influence of the random velocity of molecular gas on star-formation activities of six nearby galaxies. The physical properties of a molecular cloud, such as temperature and density, influence star-formation activities in the cloud. Additionally, local and turbulent motions of molecules in a cloud may exert substantial pressure on gravitational collapse and thus prevent or reduce star formation in the cloud. However, the influence of gas motion on star-formation activities remains poorly understood. We used data from the Atacama Large Millimeter/submillimeter Array to obtain 12CO(J=1-0) flux and velocity dispersion. We then combined these data with 3.6 and 8 micron midinfrared data from the Spitzer Space Telescope to evaluate the effects of gas motion on star-formation activities in several nearby galaxies. We discovered that relatively high velocity dispersion in molecular clouds corresponds with relatively low star-formation activity. Considering the velocity dispersion as an additional parameter, we derived a modified Kennicutt-Schmidt law with a gas surface density power index of 0.84 and velocity dispersion power index of -0.61.

Abstract Copyright: © T.-M. Wang and C.-Y. Hwang 2020

Journal keyword(s): galaxies: spiral - galaxies: star formation - galaxies: ISM

VizieR on-line data: <Available at CDS (J/A+A/641/A24): table1.dat-table6.dat list.dat fits/*>

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11098 1
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5214 1
3 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1437 1
4 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1543 2
5 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 659 3
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1189 0
7 NGC 3521 LSB 11 05 48.5676206040 -00 02 09.228156576 10.06 9.83 9.02 10.1 9.6 ~ 712 2
8 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1180 4
9 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 780 2
10 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1673 2
11 NGC 4568 GiP 12 36 34.292 +11 14 19.07   12.11 11.19     ~ 344 2
12 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3850 4
13 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1025 2
14 IC 4687 AGN 18 13 39.829 -57 43 31.25   14.35 14.3 12.78   ~ 118 1
15 CTB 64 Rad 19 00 59 +04 14.2           ~ 35 0
16 NAME Local Group GrG ~ ~           ~ 7111 0

    Equat.    Gal    SGal    Ecl

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2020.11.28-21:22:15

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