CHANDRA OBSERVATIONS OF NUCLEAR X-RAY EMISSION FROM LOW SURFACE BRIGHTNESS GALAXIES
CHANDRA OBSERVATIONS OF NUCLEAR X-RAY EMISSION FROM LOW SURFACE BRIGHTNESS GALAXIES
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DOI：
10.1088/0004-637x/693/2/1300
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
M. Das;C. Reynolds;Stuart N. Vogel;S. McGaugh;N. Kantharia
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文献类型：
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作者：
M. Das;C. Reynolds;Stuart N. Vogel;S. McGaugh;N. Kantharia
我们提出了钱德拉探测的X射线辐射的活动星系核（AGN）在两个巨大的低表面亮度（LSB）星系，UGC 2936和UGC 1455。它们的X射线光度分别为1.8 × 1042 ergs-1和1.1 × 1040 ergs-1。在这两个星系中，UGC 2936的射电噪声很大。与另一个LSB星系UGC 6614（XMM-牛顿档案数据）一起，它们似乎都位于X射线射电基本平面之上，它们的活动星系核的黑洞质量与位于相关性上的类似星系相比要低。然而，这些星系中的凸起非常发达，我们从我们样本中的八个星系中的四个星系中检测到弥漫的X射线发射。我们的研究结果表明，巨大的LSB星系的膨胀的演变独立于他们的晕为主的磁盘是低的星星形成和磁盘动力学。这些中心的演化路径类似于哈勃序列中以膨胀为主的正常星系，但LSB盘仍然没有演化。因此，凸起和盘的演化是分离的，所以无论星星的形成过程产生了凸起，都不会影响盘。
We present Chandra detections of X-ray emission from the active galactic nuclei (AGN) in two giant low surface brightness (LSB) galaxies, UGC 2936 and UGC 1455. Their X-ray luminosities are 1.8 × 1042 ergs s−1 and 1.1 × 1040 ergs s−1 respectively. Of the two galaxies, UGC 2936 is radio loud. Together with another LSB galaxy UGC 6614 (XMM-Newton archival data) both appear to lie above the X-ray–radio fundamental plane, and their AGN have black hole masses that are low compared to similar galaxies lying on the correlation. However, the bulges in these galaxies are well developed, and we detect diffuse X-ray emission from four of the eight galaxies in our sample. Our results suggest that the bulges of giant LSB galaxies evolve independently of their halo-dominated disks which are low in star formation and disk dynamics. The centers follow an evolutionary path similar to that of bulge-dominated normal galaxies on the Hubble sequence, but the LSB disks remain unevolved. Thus, the bulge and disk evolution are decoupled and so whatever star formation processes produced the bulges did not affect the disks.