We present the results of a Hubble Space Telescope ACS/HRC FUV, ACS/WFC optical study into the cluster populations of a sample of 22 Luminous Infrared Galaxies in the Great Observatories All-Sky LIRG Survey. Through integrated broadband photometry we have derived ages and masses for a total of 484 star clusters contained within these systems. This allows us to examine the properties of star clusters found in the extreme environments of LIRGs relative to lower luminosity star-forming galaxies in the local Universe. We find that by adopting a Bruzual & Charlot simple stellar population (SSP) model and Salpeter initial mass function, the age distribution of clusters declines as dN/dτ = τ −0.9+/−0.3 , consistent with the age distribution derived for the Antennae Galaxies, and interpreted as evidence for rapid cluster disruption occuring in the strong tidal fields of merging galaxies. The large number of 10 6 M young clusters identified in the sample also suggests that LIRGs are capable of producing more high-mass clusters than what is observed to date in any lower luminosity star-forming galaxy in the local Universe. The observed cluster mass distribution of dN/dM = M −1.95+/−0.11 is consistent with the canonical -2 power law used to describe the underlying initial cluster mass function (ICMF) for a wide range of galactic environments. We interpret this as evidence against mass-dependent cluster disruption, which would flatten the observed CMF relative to the underlying ICMF distribution.
Cellulose derivatives, as edible coating for fruits and vegetables, have been broadly applied due to their availability, stability, solubility, safety, and low price. Therefore, this study was conducted to (1) extract cellulose from the banana plant rachis, (2) convert it into carboxymethyl (CMC), and (3) use the produced CMC as an edible coating to retard senescence and prolong the storage life of strawberry fruit. Preparation of CMC was accomplished by an etherification process, utilizing sodium hydroxide and monochloroacetic acid (MCA), with ethanol as a supporting medium. Characterization of CMC was done by analyzing the spectra of FTIR, degree of substitution (DS), ash content, CMC yield, water and oil holding capacity, in addition to physical characteristics. A storage study with CMC as an edible coating was conducted to investigate its impact on the shelf life of stored strawberry fruits. High purity food-grade CMC was successfully produced. CMC showed a yield of 156.25% with a DS of 0.78, a water holding capacity of 11.24 g/g, and an oil holding capacity of 1.60 g/g. The resulted CMC was well suited for edible coating preparation and was used effectively to prolong the shelf life of stored strawberry fruits at 22 °C to 6 days and to 16 days for that stored at 4 °C. Weight loss, total soluble solids (TSS), decay percentage, pH, anthocyanin content, ascorbic acid content, firmness, and sensory characteristics of CMC coated strawberry fruit stored at 4 °C were better than those stored at 22 °C. Thus, CMC edible coating prepared from banana rachis could be recommended as a potential postharvest treatment to delay postharvest senescence and maintain the quality of ambient and cold stored fruits.
Globular clusters (GC) are important objects for tracing the early evolution of a galaxy. We study the relation between the properties of globular cluster systems -as quantified by the GC specific frequency (SN ) -and the properties of their host galaxies. In order to understand the origin of the relation between the GC specific frequency (SN ) and galaxy mass, we devise a theoretical model for the specific frequency (S N,th ). GC erosion is considered to be an important aspect for shaping this relation, since observations show that galaxies with low densities have a higher SN , while high density galaxies have a small SN . We construct a model based on the hypothesis that star-formation is clustered and depends on the minimum embedded star cluster mass (M ecl,min ), the slope of the power-law embedded cluster mass function (β) and the relation between the star formation rate (SFR) and the maximum star cluster mass (M ecl,max ). We find an agreement between the primordial value of the specific frequency (SNi) and our model for β between 1.5 and 2.5 with M ecl,min 10 4 M⊙.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.