# Siam Physics Congress 2015

May 20 – 22, 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Star Formation and Age-Metallicity Relation in a Galaxy Group NGC 4065

May 21, 2015, 9:45 AM
15m
White Lotus

### White Lotus

Oral presentation Astronomy, Astrophysics, and Cosmology

### Speaker

Mr Orarik Tasuya (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

### Description

We present a study of star formation, stellar age and metallicity, and interactions between galaxies in a low-redshift group, NGC 4065 group. Imaging data were taken from 2.4 meter telescope at Thai National Observatory (TNO) for B, V and R$_\mathrm{C}$ broadband filters and [S$~\small{\mathrm{II}}$] and Red-continuum narrowband filters. There are 21 galaxies in our sample. The star formation rate is represented by the equivalent width of hydrogen alpha (EW(H$\alpha$)). Stellar age and metallicity are examined by using the Medium resolution INT Library of Empirical Spectra (MILES) for the stellar population synthesis model predictions. The result shows that most of early type galaxies (ETGs) with EW(H$\alpha$)) in the sample galaxies less than 10 Å, gas-deficient galaxies, while late type galaxies (LTGs) show more EW(H$\alpha$) and bluer than the ETGs. That means star formation activity in the LTGs could be triggered by ram-pressure stripping and tidal interaction between galaxy members due to dense environmental effect in the compact group.

### Primary author

Mr Orarik Tasuya (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

### Co-authors

Dr Utane Sawangwit (National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand) Dr Wichean Kriwattanawong (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

### Presentation materials

There are no materials yet.