Central star formation in an early-type galaxy I~Zw~81 in the Bootes void
Divya Pandey, Kanak Saha, Ananta C. Pradhan, Sugata Kaviraj

TL;DR
This study investigates the unusual star formation activity in the early-type galaxy I~Zw~81 within the Bootes void, revealing complex structural components, a star-forming disk, and the influence of a strong bar and minor mergers, despite hosting an AGN.
Contribution
First detailed multi-wavelength structural and spectral analysis of I~Zw~81, a massive barred lenticular galaxy in a void, highlighting its active star formation and structural complexity.
Findings
I~Zw~81 is a disk-dominated, star-forming galaxy with a bar and multiple structural components.
The galaxy's UV emission is concentrated in the central region, indicating active star formation.
A strong bar and minor mergers likely drive gas inflow and star formation, despite the presence of an AGN.
Abstract
The origin of star-formation in customarily passively evolving early-type massive galaxies is poorly understood. We present a case study of a massive galaxy, I~Zw~81, inside the Bootes void. The void galaxy is known to host an active galactic nuclei (AGN). Our detailed 2D decomposition of the surface brightness distribution in the () g- and r-bands revealed multiple structural components such as a nuclear point source, a bar, a ring, and an inner exponential disk followed by an outer low surface brightness (LSB) disk. I~Zw~81 turns out to be a disk-dominated galaxy with lenticular morphology. The modelling of the multi-wavelength spectral energy distribution (SED) shows that the galaxy is star-forming (SF), and belongs to the blue cloud. We find that the optical (gr) color of the bar is bluer than the disks, and the far- and…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Scientific Research and Discoveries
