First detection of a subkiloparsec scale molecular outflow in the starburst galaxy NGC3628

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100818

Title:	First detection of a subkiloparsec scale molecular outflow in the starburst galaxy NGC3628
Authors:	蔡安理;Tsai, An-Li;Matsushita, Satoki;Kong, Albert K. H.;Matsumoto, Hironori;Kohno, Kotaro
Contributors:	理學院天文研究所
Keywords:	Arrays;ASTRONOMY;ASTROPHYSICS;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;COMPARATIVE EVALUATIONS;Consumption;DETECTION;Earth, ocean, space;Emission;EVOLUTION;Evolutionary;Exact sciences and technology;FLOW RATE;GALAXIES;MASS;Outflow;PHOTON EMISSION;Physical properties;PLASMA;SOFT X RADIATION;SPATIAL DISTRIBUTION;X-rays
Date:	2012-06-10
Issue Date:	2026-04-21 14:15:21 (UTC+8)
Publisher:	IOP Publishing Ltd.;Bristol: IOP
Abstract:	摘要： We successfully detected a molecular outflow with a scale of 370-450 pc in the central region of the starburst galaxy NGC 3628 through deep CO(1-0) observations by using the Nobeyama Millimeter Array (NMA). The mass of the outflowing molecular gas is ~2.8 x 10 super(7) M sub([middot in circle]), and the outflow velocity is ~90 + or - 10 km s super(-1). The expansion timescale of the outflow is 3.3-6.8 Myr, and the molecular gas mass flow rate is 4.1-8.5 M sub([middot in circle]) yr super(-1). It requires mechanical energy of (1.8-2.8) x 10 super(54) erg to create this sub-kpc scale molecular outflow. In order to understand the evolution of the molecular outflow, we compare the physical properties between the molecular outflow observed from our NMA CO(1-0) data and the plasma gas from the soft X-ray emission of the Chandra X-ray Observatory archival data. We found that the distribution between the molecular outflow and the strong plasma outflow seems to be in a similar region. In this region, the ram pressure and the thermal pressure of the plasma outflow are 10 super(-(8-10)) dyn cm super(-2), and the thermal pressure of molecular outflow is 10 super(-(11-13)) dyn cm super(-2). This implies that the molecular outflow is still expanding outward. The molecular gas consumption timescale is estimated as 17-27 Myr, and the total starburst timescale is 20-34 Myr. The evolutionary parameter is 0.11-0.25, suggesting that the starburst activity in NGC 3628 is still in a young stage. 出版者： Bristol: IOP 出版日期： 2012-06-10 出處： The Astrophysical journal, 2012-06, Vol.752 (1), p.38-14 資源來源： IoP Science journals 版權： 2015 INIST-CNRS 識別號： ISSN: 0004-637X 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/752/1/38 識別號： CODEN: ASJOAB
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	19	View/Open

社群 sharing

Loading...