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Premana Wardayanti Premadi
Astronomy Research Group And Bosscha Observatory, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics

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Properties of the Environment of Galaxies in Clusters of Galaxies CL 0024+1654 and RX J0152.7−1357 Premana Wardayanti Premadi; Dading Hadi Nugroho; Anton Timur Jaelani
Journal of Mathematical and Fundamental Sciences Vol. 53 No. 3 (2021)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2021.53.3.7

Abstract

We report the results of combined analyses of X-ray and optical data of two galaxy clusters, CL 0024+1654 and RX J0152.7−1357 at redshift z = 0.395 and z = 0.830, respectively, offering a holistic physical description of the two clusters. Our X-ray analysis yielded temperature and density profiles of the gas in the intra-cluster medium (ICM). Using optical photometric and spectroscopic data, complemented with mass distribution from a gravitational lensing study, we investigated any possible correlation between the physical properties of the galaxy members, i.e. their color, morphology, and star formation rate (SFR), and their environments. We quantified the properties of the environment around each galaxy by galaxy number density, ICM temperature, and mass density. Although our results show that the two clusters exhibit a weaker correlation compared to relaxed clusters, it still confirms the significant effect of the ICM on the SFR in the galaxies. The close relation between the physical properties of galaxies and the condition of their immediate environment found in this work indicates the locality of galaxy evolution, even within a larger bound system such as a cluster. Various physical mechanisms are suggested to explain the relation between the properties of galaxies and their environment.
Variability Survey of Southern Open Clusters NGC 6134, NGC 6416, Collinder 394, and Alessi 10 Mandey, Denny; Ramadhan, Dhimaz Gilang; Yusuf, Muhammad; Perhati, Teduh; Ramadhan, Sahlan; Pramono, Theofilus Hobba; Anin, Chornelis J’Be; Premadi, Premana Wardayanti; Jaelani, Anton Timur; Jatmiko, Agus Triono Puri; Arifyanto, Mochamad Ikbal
Journal of Mathematical and Fundamental Sciences Vol. 57 No. 3 (2026): (In Progress)
Publisher : Directorate for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2026.57.3.1

Abstract

We present the results of a brightness variability survey of four southern open clusters, namely NGC 6134, NGC 6416, Collinder 394, and Alessi 10, which were observed using three telescopes following a time series photometric scheme during the dry season in 2022. The purpose of these observations was to detect variability events and their types of variability in star members of these four clusters. Data analysis was performed using a differential photometry method to produce light curves. Several new variable star candidates were discovered in the observed clusters. More observational data are needed to examine the consistency of the variabilities, estimate relevant periodicity, and determine the type of variable star.
Co-Authors Anin, Chornelis J’Be Anton Timur Jaelani Arifyanto, Mochamad Ikbal Dading Hadi Nugroho Jaelani, Anton Timur Jatmiko, Agus Triono Puri Mandey, Denny Muhammad Yusuf Perhati, Teduh Pramono, Theofilus Hobba Ramadhan, Dhimaz Gilang Ramadhan, Sahlan