STAR FORMATION LAWS IN BOTH GALACTIC MASSIVE CLUMPS AND EXTERNAL GALAXIES : EXTENSIVE STUDY WITH DUST CONINUUM, HCN (4-3), AND CS (7-6)

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Liu , T , Kim , K-T , Yoo , H , Liu , S-Y , Tatematsu , K , Qin , S-L , Zhang , Q , Wu , Y , Wang , K , Goldsmith , P F , Juvela , M , Lee , J-E , Toth , L V , Mardones , D , Garay , G , Bronfman , L , Cunningham , M R , Li , D , Lo , N , Ristorcelli , I & Schnee , S 2016 , ' STAR FORMATION LAWS IN BOTH GALACTIC MASSIVE CLUMPS AND EXTERNAL GALAXIES : EXTENSIVE STUDY WITH DUST CONINUUM, HCN (4-3), AND CS (7-6) ' , Astrophysical Journal , vol. 829 , no. 2 , 59 . https://doi.org/10.3847/0004-637X/829/2/59

Title: STAR FORMATION LAWS IN BOTH GALACTIC MASSIVE CLUMPS AND EXTERNAL GALAXIES : EXTENSIVE STUDY WITH DUST CONINUUM, HCN (4-3), AND CS (7-6)
Author: Liu, Tie; Kim, Kee-Tae; Yoo, Hyunju; Liu, Sheng-Yuan; Tatematsu, Ken'ichi; Qin, Sheng-Li; Zhang, Qizhou; Wu, Yuefang; Wang, Ke; Goldsmith, Paul F.; Juvela, Mika; Lee, Jeong-Eun; Toth, L. Viktor; Mardones, Diego; Garay, Guido; Bronfman, Leonardo; Cunningham, Maria R.; Li, Di; Lo, Nadia; Ristorcelli, Isabelle; Schnee, Scott
Contributor: University of Helsinki, Department of Physics
Date: 2016-10-01
Language: eng
Number of pages: 21
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/183621
Abstract: We observed 146 Galactic clumps in HCN (4-3) and CS (7-6) with the Atacama Submillimeter Telescope Experiment 10 m telescope. A tight linear relationship between star formation rate and gas mass traced by dust continuum emission was found for both Galactic clumps and the high redshift (z > 1) star forming galaxies (SFGs), indicating a constant gas depletion time of similar to 100 Myr for molecular gas in both Galactic clumps and high z SFGs. However, low z galaxies do not follow this relation and seem to have a longer global gas depletion time. The correlations between total infrared luminosities (L-TIR) and molecular line luminosities (L-mol') of HCN (4-3) and CS (7-6) are tight and sublinear extending down to clumps with L-TIR similar to 10(3) L-circle dot. These correlations become linear when extended to external galaxies. A bimodal behavior in the L-TIR-L-mol' correlations was found for clumps with different dust temperature, luminosity-to-mass ratio, and sigma(line)/sigma(vir). Such bimodal behavior may be due to evolutionary effects. The slopes of L-TIR-L-mol' correlations become more shallow as clumps evolve. We compared our results with lower J transition lines in Wu et al. (2010). The correlations between clump masses and line luminosities are close to linear for low effective excitation density tracers but become sublinear for high effective excitation density tracers for clumps with L-TIR larger than L-TIR similar to 10(4.5) L-circle dot. High effective excitation density tracers cannot linearly trace the total clump masses, leading to a sublinear correlations for both M-clump-L-mol' and L-TIR-L-mol' relations.
Subject: galaxies: evolution
galaxies: ISM
ISM: kinematics and dynamics
stars: formation
ULTRALUMINOUS INFRARED GALAXIES
DENSE GAS TRACERS
HIGH-J CO
MOLECULAR CLOUDS
FORMING REGIONS
COMPLETE SAMPLE
FORMATION RATES
MILKY-WAY
LUMINOSITY
CONTINUUM
115 Astronomy, Space science
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