The evolution of interacting spiral galaxy NGC 5194

The evolution of interacting spiral galaxy NGC 5194
复制标题

相互作用的螺旋星系 NGC 5194 的演化

DOI:
10.1093/mnras/stv340
复制
发表时间:
2015-03
影响因子:
4.8
通讯作者:
Wang Lang
Wang Lang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kang Xiaoyu;Chang Ruixiang;Zhang Fenghui;Cheng Liantao;Wang Lang

文献摘要

参考文献

被引文献

相似文献

NGC 5194(M51a)是一个巨大的螺旋星系,正在与它的同伴相互作用。在这里,我们专注于调查的主要性质,它的星星形成历史(SFH)通过构建一个简单的演化模型,该模型假设的光盘建立逐渐冷气体的下降和气体的下降率可以参数化描述的高斯形式。通过与观测资料的比较,讨论了模型中自由参数的可能取值范围,从而对M51a的演化和SFH的主要性质有了进一步的认识。我们发现,模型预测对自由参数非常敏感,采用固定的入峰时间t(p)= 7.0 Gyr的模型可以再现M51a的大部分观测约束。虽然我们的模型没有假设内盘的气体进入时间尺度比外盘短,但我们的模型预测仍然表明M51a的盘由内而外形成。我们发现M51 a的平均恒星年龄比银河系年轻,但比富含气体的盘星系UGC 8802年长。在本文中,我们还介绍了一个“玩具”模型,允许最近发生的额外的冷气体的下降来模拟M51a和它的同伴之间的相互作用的影响。结果表明,当前分子气体表面密度、星星形成速率和紫外波段表面亮度是追踪近期相互作用对银河系星星形成过程影响的重要参量。
NGC 5194 (M51a) is a grand-design spiral galaxy and undergoing interactions with its companion. Here, we focus on investigating main properties of its star formation history (SFH) by constructing a simple evolution model, which assumes that the disc builds up gradually by cold gas infall and the gas infall rate can be parameterizedly described by a Gaussian form. By comparing model predictions with the observed data, we discuss the probable range for free parameter in the model and then know more about the main properties of the evolution and SFH of M51a. We find that the model predictions are very sensitive to the free parameter and the model adopting a constant infall-peak time t(p) = 7.0 Gyr can reproduce most of the observed constraints of M51a. Although our model does not assume the gas infall time-scale of the inner disc is shorter than that of the outer disc, our model predictions still show that the disc of M51a forms inside-out. We find that the mean stellar age of M51a is younger than that of the Milky Way, but older than that of the gas-rich disc galaxy UGC 8802. In this paper, we also introduce a 'toy' model to allow an additional cold gas infall occurred recently to imitate the influence of the interaction between M51a and its companion. Our results show that the current molecular gas surface density, the star formation rate and the UV-band surface brightness are important quantities to trace the effects of recent interaction on galactic star formation process.
DOI: 10.1051/0004-6361:200811068
发表时间: 2008-12
影响因子: 6.5
作者:
R. Scheepmaker;H. Lamers;P. Anders;S. Larsen
通讯作者: R. Scheepmaker;H. Lamers;P. Anders;S. Larsen
DOI: 10.1086/491786
发表时间: 2005-10
期刊: The Astronomical Journal
影响因子: --
作者:
M. Lee;R. Chandar;B. Whitmore
通讯作者: M. Lee;R. Chandar;B. Whitmore
DOI: 10.1086/424377
发表时间: 2004-07
期刊: The Astrophysical Journal
影响因子: --
作者:
F. Bresolin;D. Garnett;Robert C. Kennicutt Jr.
通讯作者: F. Bresolin;D. Garnett;Robert C. Kennicutt Jr.
DOI: 10.1088/0067-0049/190/2/233
发表时间: 2010-07
期刊: The Astrophysical Journal Supplement Series
影响因子: --
作者:
J. Moustakas;R. Kennicutt;C. Tremonti;D. Dale;John-David T. Smith;D. Calzetti
通讯作者: J. Moustakas;R. Kennicutt;C. Tremonti;D. Dale;John-David T. Smith;D. Calzetti