3D spectroscopy of local luminous compact blue galaxies: Kinematics of NGC 7673
3D spectroscopy of local luminous compact blue galaxies: Kinematics of NGC 7673
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局部发光致密蓝色星系的 3D 光谱：NGC 7673 的运动学
DOI：
10.1111/j.1365-2966.2009.15989.x
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发表时间：
2009
影响因子：
4.8
通讯作者：
West Virginia University Centro Astron'omico Hispano Alem'an
中科院分区：
文献类型：
--
作者：
J. P'erez;R. Guzm'an;Á. Castillo;F. Castander;J. Gallego;C. A. Garland;N. Gruel;D. Pisano;S. S'anchez;J. Z. D. O. Astronomy;University of Cambridge Instituto de Astrof'isica de Canarias Astrof'isica;Universidad Complutense de Madrid Institut de Ciencies de l'Espai;Universitat Autonoma de Barcelona Department of Natural Sciences;Cas Department of Physics;West Virginia University Centro Astron'omico Hispano Alem'an
利用位于西班牙阿勒曼天文中心的3.5 m望远镜上的PPAK积分场单元拍摄的三维数据，研究了本地发光致密蓝星系NGC 7673电离气体的运动特性。我们的数据揭示了一个不对称的旋转速度场，峰与峰之间的差为60 km s−1。运动中心位于中心速度宽度最大的位置（54±1 km s−1），这与整个星系的光度加权质心的位置一致。从速度场等高线的方向测量，小旋转轴的位置角为168°。找到了至少两个解耦的运动分量。第一个是致密的，与第二活跃的恒星形成区（星团B）的位置一致。第二种是延伸的，没有清晰的光学对应物。没有证据表明活跃的星系核活动或超新星星系风为这两种成分中的任何一种提供动力。然而，我们的数据显示了支持先前提出的小型合并场景的证据，其中一个矮星系，暂时被确定为B团，正在落入NGC 7673。触发星爆。最后表明，在虚化假设下，使用导出的旋转曲线或积分速度宽度可能会严重低估该星系的动力质量。
The kinematic properties of the ionized gas of local Luminous Compact Blue Galaxy (LCBG) NGC 7673 are presented using three dimensional data taken with the PPAK integral field unit at the 3.5-m telescope in the Centro Astronomico Hispano Aleman. Our data reveal an asymmetric rotating velocity field with a peak to peak difference of 60 km s −1 . The kinematic centre is found to be at the position of a central velocity width maximum (� = 54± 1 km s −1 ), which is consistent with the position of the luminosity-weighted centroid of the entire galaxy. The position angle of the minor rotation axis is 168 � as measured from the orientation of the velocity field contours. At least two decoupled kinematic components are found. The first one is compact and coincides with the position of the second most active star formation region (clump B). The second one is extended and does not have a clear optical counterpart. No evidence of active galactic nuclei activity or supernovae galactic winds powering any of these two components has been found. Our data, however, show evidence in support of a previously proposed minor merger scenario in which a dwarf galaxy, tentatively identified with clump B, is falling into NGC 7673. and triggers the starburst. Finally, it is shown that the dynamical mass of this galaxy may be severely underestimated when using the derived rotation curve or the integrated velocity width, under the assumption of virialization.