arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2207.07906astro-ph.GA
收藏

用MUSE探测棒星系中恒星和电离气体的非圆运动

Exploring stellar and ionized gas non--circular motions in barred galaxies with MUSE

Carlos Lopez-Coba, Sebastian F. Sanchez, Lihwai Lin, Joseph P. Anderson, Kai-Yang Lin, Irene Cruz-Gonzalez, L. Galbany, Jorge K. Barrera-Ballesteros

摘要:

我们提出了MUSE积分场恒星和电离速度地图的样本14棒星系。这些对象中的大多数表现出“S”形的等速度的酒吧区域表示存在的流动运动中的速度场。通过应用圆旋转模型,我们观察到,酒吧离开恒星速度的残差图的对称结构。%,这证明了MUSE仪器用于检测运动杆特征的能力。我们使用\xs ~工具建立了非圆旋转模型来表征观测到的速度场。特别地,我们采用双对称模型和一个杆势的谐波分解来描述非轴对称速度。我们发现,这两种模型再现所观察到的运动学特征。从双对称模型估计的椭圆形失真的位置角与光度计杆位置角$(ρ_{pearson} = 0.95)$相关,这表明非圆形速度是由杆引起的。然而,由于$s_3$谐波的低振幅,我们不能排除径向流作为可能的源。%由于在我们的物体中\ha ~的微弱检测,我们不能比较气体和恒星在我们的样本中的非圆形运动,尽管我们表明,当星系富含气体时,也观察到椭圆形畸变,但幅度更大。%最后,我们没有发现证据表明,非圆运动的振幅是依赖于酒吧的大小,恒星质量或全球SFR。

英文摘要:

We present MUSE integral field stellar and ionized velocity maps for a sample of 14 barred galaxies. Most of these objects exhibit "S"-shape iso-velocities in the bar region indicative of the presence of streaming motions in the velocity fields. % By applying circular rotation models we observe that bars leave symmetric structures in the residual maps of the stellar velocity. %which demonstrates the capabilities of the MUSE instrument for detecting kinematic bar signatures. % We built non-circular rotation models using the \xs~tool to characterize the observed velocity fields. In particular we adopt bisymmetric models and a harmonic decomposition for a bar potential for describing the non-axisymmetric velocities. We find that both models reproduce the observed kinematic features. % The position angle of the oval distortion estimated from the bisymmetric model correlates with the photometric bar position angle $(ρ_{pearson} = 0.95)$, which suggest that non-circular velocities are caused by the bar. However because of the low amplitudes of the $s_3$ harmonic we can not rule out radial flows as possible source. % Because of the weak detection of \ha~in our objects we are not able to compare gas to stellar non-circular motions in our sample, although we show that when galaxies are gas rich the oval distortion is also observed but with larger amplitudes. % Finally, we do not find evidence that the amplitude of the non-circular motions is dependent on the bar size, stellar mass or the global SFR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑