Properties of Isolated Galaxies in the Digital Survey Isolated Galaxies (DSIG) Catalogue within a Redshift Range (0.005 < Z < 0.080)
Loading...
Date
2023
Authors
Kinyumu, Marcelina K.
Kimani, Naftali
Nyenge, Raphael
Obonyo, Willice
Journal Title
Journal ISSN
Volume Title
Publisher
RAS
Abstract
Evolution of galaxies is known to be influenced by a number of factors such as the environment that hosts the galaxy as well
as the galaxies intrinsic properties. The environmental effects on galaxy properties have not been fully quantified. In our study,
we analysed a sample of isolated galaxies within 0.005 < z < 0.080 from Sloan Digital Sky Survey data release 16, as part of a
Digital Survey Isolated Galaxies catalogue. The aim was to investigate intrinsic physical properties of singly isolated galaxies in
low-density environment. We investigated the galaxies morphology, colour, luminosity, stellar masses, and star formation rates
(SFRs). A concentration index, Cr, of 2.65 separates our isolated sample into early and late types, with the late-types (spiral
galaxies) dominating the isolated sample at 68 per cent as confirmed from the visually classified sample obtained from Galaxy
Zoo. Our isolated ellipticals are redder, massive, and more luminous, while the isolated spirals are blue, less massive, and less
luminous. Both the isolated spirals and ellipticals have steeper colour relations indicating a fast transition to the red sequence.
In the colour–colour analysis, most ellipticals were quiescent with the majority of spirals being star forming. 5 per cent of
the isolated ellipticals have recently quenched their star formation and are transiting to the red sequence. The isolated spirals
experiences higher star-forming activities, with a small fraction of passively evolving high-mass isolated spirals. Similarly,
isolated ellipticals exhibit low SFRs indicating passive evolution, with a fraction being actively star forming
Description
Article
Keywords
methods: statistical, galaxies: evolution, galaxies: fundamental parameters, galaxies: star formation
Citation
Kinyumu, M. K., Kimani, N., Nyenge, R., & Obonyo, W. (2024). Properties of isolated galaxies in the Digital Survey Isolated Galaxies (DSIG) catalogue within a redshift range (0.005< z< 0.080). Monthly Notices of the Royal Astronomical Society, 527(1), 1368-1380.