Deciphering the properties of UV upturn galaxies in the Virgo cluster

• DOI: 10.48550/arxiv.2410.17328
• Publication Date: 2024-10-22
• Authors: Krishna R. Akhil; Sreeja S. Kartha; Namitha Kizhuprakkat; K. Ujjwal; P Niranjana
• Keywords: Virgo Cluster

The UV upturn refers to the increase in flux at wavelengths shorter than 3000 {\AA} observed quiescent early-type galaxies (ETGs), which still remains a puzzle. In this study, we aim identify ETGs showing phenomenon within Virgo galaxy cluster. We utilized color-color diagram all potential possible galaxies. Spectral Energy Distributions (SED) of these were then analyzed using CIGALE software; confirmed presence found that SED fitting method is best tool visualize and confirm ETGs. Our findings reveal population distributions regarding stellar mass star formation rate properties are similar between red sequence suggest contribution originates from old populations can be modeled effectively without burst model. Moreover, by estimating temperature responsible for emission, determined it 13,000 K 18,000 K. These estimates support notion likely arises low evolved (extreme horizontal branch stars). Furthermore, Mg2 index, metallicity indicator, shows higher strength follows trend previous studies. This study sheds light on nature cluster provides evidence low-mass mechanisms driving phenomenon.