NGC 1266 AS A LOCAL CANDIDATE FOR RAPID CESSATION OF STAR FORMATION

NGC 1266 AS A LOCAL CANDIDATE FOR RAPID CESSATION OF STAR FORMATION
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NGC 1266 是恒星形成迅速停止的本地候选者

DOI:
10.1088/0004-637x/780/2/186
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发表时间:
2013
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Alatalo K
Alatalo K
中科院分区:
--
文献类型:
--
作者:
Alatalo K

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我们提出了用于光学星云研究的新的光谱面积单位(SAURON)积分场光谱和快速紫外光学望远镜(UVOT)对分子流出宿主星系NGC 1266的观测结果,表明NGC 1266经历了快速停止恒星形成的过程。SAURON的恒星群年龄图和Swift UVOT的观测结果都表明,在中心1kpc内存在年轻的(< 1 Gyr)恒星群,而现有的毫米波天文研究联合阵列CO(1 - 0)地图表明,当前恒星形成的地点仅限于星系的内部几百秒差距。来自Moustakas & Kennicutt的NGC 1266的光谱揭示了一个典型的星暴后(K+ a)恒星群,Davis等人证实了系统中的电离气体发射来自激波。具有K+ A光谱和激波样电离气体谱线比率的星系可能构成了星暴后星系群中一个重要的、被忽视的部分,其中包含的正是那些活动星系核(AGN)正在积极地排出恒星形成物质的天体。虽然AGN的活动不太可能是500迈前发生的星暴事件的驱动因素,但哈勃太空望远镜宽视场相机3 Y, j和h波段成像中看到的微弱螺旋结构似乎表明引力扭矩可能是罪魁祸首。如果分子气体在更大尺度星系盘淬火的同时被驱动到中心,AGN可能能够通过射电射流向密集的分子气体循环注入湍流能量,从而抑制恒星的形成,从而维持分子气体的存在约1 Gyr。
We present new Spectrographic Areal Unit for Research on Optical Nebulae (SAURON) integral-field spectroscopy and Swift Ultraviolet Optical Telescope (UVOT) observations of molecular outflow host galaxy NGC 1266 that indicate NGC 1266 has experienced a rapid cessation of star formation. Both the SAURON maps of stellar population age and the Swift UVOT observations demonstrate the presence of young (< 1 Gyr) stellar populations within the central 1 kpc, while existing Combined Array for Research in Millimeter-Wave Astronomy CO (1–0) maps indicate that the sites of current star formation are constrained to only the inner few hundred parsecs of the galaxy. The optical spectrum of NGC 1266 from Moustakas & Kennicutt reveal a characteristic poststarburst (K+ A) stellar population, and Davis et al. confirm that ionized gas emission in the system originate from a shock. Galaxies with K+ A spectra and shock-like ionized gas line ratios may comprise an important, overlooked segment of the poststarburst population, containing exactly those objects in which the active galactic nucleus (AGN) is actively expelling the star-forming material. While AGN activity is not the likely driver of the poststarburst event that occurred 500 Myr ago, the faint spiral structure seen in the Hubble Space Telescope Wide-field Camera 3 Y-, J-and H-band imaging seems to point to the possibility of gravitational torques being the culprit. If the molecular gas were driven into the center at the same time as the larger scale galaxy disk underwent quenching, the AGN might be able to sustain the presence of molecular gas for≳ 1 Gyr by cyclically injecting turbulent energy into the dense molecular gas via a radio jet, inhibiting star formation.
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