Astrophys. J., 888, 92-92 (2020/January-2)
Star-forming clumps in local luminous infrared galaxies.
LARSON K.L., DIAZ-SANTOS T., ARMUS L., PRIVON G.C., LINDEN S.T., EVANS A.S., HOWELL J., CHARMANDARIS V., U V., SANDERS D.B., STIERWALT S., BARCOS-MUNOZ L., RICH J., MEDLING A., COOK D., OKLOPCIC A., MURPHY E.J. and BONFINI P.
Abstract (from CDS):
We present HST narrowband near-infrared imaging of Paα and Paβ emission of 48 local luminous infrared galaxies (LIRGs) from the Great Observatories All-Sky LIRG Survey. These data allow us to measure the properties of 810 spatially resolved star-forming regions (59 nuclei and 751 extranuclear clumps) and directly compare their properties to those found in both local and high-redshift star-forming galaxies. We find that in LIRGs the star-forming clumps have radii ranging from ∼90 to 900 pc and star formation rates (SFRs) of ∼1 x 10–3 to 10 M☉ yr–1, with median values for extranuclear clumps of 170 pc and 0.03 M☉ yr–1. The detected star-forming clumps are young, with a median stellar age of 8.7 Myr, and have a median stellar mass of 5 x 105 M☉. The SFRs span the range of those found in normal local star-forming galaxies to those found in high-redshift star-forming galaxies at z = 1-3. The luminosity function of the LIRG clumps has a flatter slope than found in lower-luminosity, star-forming galaxies, indicating a relative excess of luminous star-forming clumps. In order to predict the possible range of star-forming histories and gas fractions, we compare the star-forming clumps to those measured in the MassiveFIRE high-resolution cosmological simulation. The star-forming clumps in MassiveFIRE cover the same range of SFRs and sizes found in the local LIRGs and have total gas fractions that extend from 10% to 90%. If local LIRGs are similar to these simulated galaxies, we expect that future observations with ALMA will find a large range of gas fractions, and corresponding star formation efficiencies, among the star-forming clumps in LIRGs.
© 2020. The American Astronomical Society. All rights reserved.
Interacting galaxies - Star-forming regions - Luminous infrared galaxies
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