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Star Formation History of Two Fields in the Halo of NGC 5128

Published online by Cambridge University Press:  09 June 2023

Sima T. Aghdam Open the ORCID record for Sima T. Aghdam [Opens in a new window] ,
Atefeh Javadi Open the ORCID record for Atefeh Javadi [Opens in a new window] ,
Seyedazim Hashemi ,
Jacco Th. van Loon ,
Habib Khosroshahi ,
Roya H. Golshan ,
Elham Saremi  and
Maryam Saberi Open the ORCID record for Maryam Saberi [Opens in a new window]
Sima T. Aghdam
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: sima.t.ahdam@gmail.com
Atefeh Javadi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: sima.t.ahdam@gmail.com
Seyedazim Hashemi
Affiliation:
Department of Physics and Astronomy, University of California Riverside, CA 92521, The USA Department of Physics, Sharif University of Technology, Tehran, 11155-9161, Iran
Jacco Th. van Loon
Affiliation:
Lennard-Jones Laboratories, Keele University, ST5 5BG, UK
Habib Khosroshahi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: sima.t.ahdam@gmail.com
Roya H. Golshan
Affiliation:
Physikalisches Institut der Universität zu Köln, Zülpicher Str. 77, 50937, Köln, Germany
Elham Saremi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: sima.t.ahdam@gmail.com Instituto de Astrofìsica de Canarias, C/ Vìa Làctea s/n, 38205 La Laguna, Tenerife, Spain Departamento de Astrofìsica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
Maryam Saberi
Affiliation:
Rosseland Centre for Solar Physics, University of Oslo, P.O. Box 1029, Blindern, NO-0315, Oslo, Norway
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Abstract

NGC 5128 galaxy is a giant elliptical galaxy located in the Centaurus group of galaxies at 3.8 Mpc. We aim to study the star formation history (SFH) of two different fields of the galaxy. The northeastern field (Field 1) is located at a distance of 18.8 kpc, while the southern field (Field 2) is at 9.9 kpc. We use a photometric method that is based on identifying long period variable (LPV) stars and asymptotic giant branch (AGB) stars, as they are strong tracers of star formation and galaxy evolution due to their luminosity and variability; 395 LPVs in Field 1 and 671 LPVs in Field 2 have been identified. These two fields present similar SFHs, although the SF rate of Field 2 is more enhanced. We find that the galaxy has three major star formation episodes t ∼ 800 Myr ago, t ∼ 3.2 Gyr ago, and t ∼ 10 Gyr ago, where t is look-back time. The rate of star formation at ∼ 800 Myr ago agrees with previous studies suggesting that the galaxy experienced a merger around that time. Furthermore, NGC 5128 has experienced a lower star formation rate in its recent history which could have been driven by jet-induction star formation and multiple outbursts of AGN activity in this galaxy, as well as a minor merger around 400 Myr ago.

Keywords

stars: AGB and LPVstars: formationgalaxies: jetsgalaxies: nucleigalaxies: halosgalaxies: evolutiongalaxies: star formationgalaxies: individual: NGC 5128
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 306 - 309
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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