Journal
ASTRONOMY & ASTROPHYSICS
Volume 659, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202141963
Keywords
galaxies: star formation; galaxies: ISM; infrared: galaxies
Categories
Funding
- Spanish Ministerio de Economia y Competitividad [BES-2016-078922, ESP2017-83197-P]
- Comunidad de Madrid through the Atraccion de Talento Investigador Grant [2018-T1/TIC-11035, PID2019-105423GA-I00, 2017-T1/TIC-5213, PID2019-106280GB-I00]
- MCIN/AEI [PGC2018-094671-B-I00]
- ERDF A way of making Europe
- Spanish Ministerio de Ciencia e Innovacion [PID2019-106027GA-C44]
- Comunidad de Madrid through the Atraccion de Talento grant [2017-T1/TIC-5213]
- State Agency for Research of the Spanish MCIU through the 'Centre of Excellence Severo Ochoa' award [SEV-2017-0709]
- [PID2019106280GB-100]
Ask authors/readers for more resources
We analysed the star formation relationships in a sample of 16 nearby luminous infrared galaxies, and found a duality in the Kennicutt-Schmidt relation. This duality is related to different dynamical environments within each galaxy and shows different molecular gas and star formation rate at different radii. The star formation efficiency increases with increasing boundedness in galaxies with dual behaviour.
We analyse the star formation (SF) relations in a sample of 16 nearby luminous infrared galaxies (LIRGs) with more than 2800 regions defined on scales of 90 to 500 pc. We used ALMA to map the distribution of the cold molecular gas traced by the J = 2-1 line of CO and archival Pa alpha HST/NICMOS imaging to trace the recent SF. In four objects we find two different branches in the Kennicutt-Schmidt relation at 90 pc scales, suggesting the existence of a duality in this relation. The two branches correspond to two different dynamical environments within each galaxy. One branch, which corresponds to the central region of these galaxies (90% of the regions are located at radii <0.85 kpc), shows higher gas and SF rate surface densities with higher velocity dispersion. The other branch, which shows lower molecular gas and SF rate surface densities, corresponds to the more external disk regions (r similar to 1 kpc). Despite the scatter, the SF efficiency of the galaxies with dual behaviour increases with increasing boundedness as measured by the b parameter (b Sigma(H2)/sigma(2) proportional to alpha(-1)(vir)). At larger spatial scales (250 and 500 pc), the duality disappears. The rest of the sample does not show evidence of this dual behaviour at any scale.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available