Star formation in the central regions of active and normal galaxies

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101581

Title:	Star formation in the central regions of active and normal galaxies
Authors:	黃崇源;Tsai, Mengchun;Hwang, Chorng-Yuan
Contributors:	理學院天文研究所
Keywords:	Active galactic nuclei;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;Correlation;CORRELATIONS;Density;EMISSION;GALACTIC EVOLUTION;Galaxies;galaxies: active;galaxies: evolution;galaxies: nuclei;galaxies: Seyfert;galaxies: star formation;GALAXY NUCLEI;Liners;MASS;Radio;SEYFERT GALAXIES;STAR EVOLUTION;Star formation
Date:	2015-08-01
Issue Date:	2026-04-21 14:38:18 (UTC+8)
Publisher:	IOP Publishing Ltd.;United States: The American Astronomical Society
Abstract:	摘要： ABSTRACT We investigated the properties of the host galaxies of active galactic nuclei (AGNs). We used radio emission around the nuclei of the host galaxies to represent AGN activity and used infrared (IR) emission to represent the star-forming activity and stellar population of the host galaxies. We determined that active galaxies have higher stellar masses (SMs) within the central kiloparsec radius than normal galaxies do independent of the Hubble types of the host galaxies; but both active and normal galaxies exhibit similar specific star formation rates (SSFRs), ranging between and yr−1. We find that the central SM surface density might be used as an indicator to identify AGNs. We also discovered that certain AGNs exhibit substantial inner stellar structures in the IR images; most of the AGNs with inner structures are Seyferts, whereas only a few LINERs exhibit inner structures. We note that the AGNs with inner structures show a positive correlation between the radio activity of the AGNs and the SFRs of the host galaxies, but the sources without inner structures show a negative correlation between the radio power and the SFRs. These results might be explained with a scenario of starburst-AGN evolution. In this scenario, AGN activities are triggered following a nuclear starburst; during the evolution, AGN activities are accompanied by SF activity in the inner regions of the host galaxies; at the final stage of the evolution, the AGNs might transform into LINERs, exhibiting weak SF activity in the central regions of the host galaxies. 其他題名： AJ 其他題名： Astron. J 出版者： United States: The American Astronomical Society 出版日期： 2015-08-01 出處： The Astronomical journal, 2015-08, Vol.150 (2), p.43-15 資源來源： Institute of Physics Journals 版權： 2015. The American Astronomical Society. All rights reserved. 識別號： ISSN: 0004-6256 識別號： ISSN: 1538-3881 識別號： EISSN: 1538-3881 識別號： DOI: 10.1088/0004-6256/150/2/43
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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