LBT对IC2574近期恒星形成活动的全景
The LBT Panoramic View on the Recent Star-Formation Activity in IC2574
摘要：
我们提出了深成像的恒星形成矮星系IC 2574在M81组的大双筒望远镜，以详细研究最近的恒星形成历史，这个星系和限制其HI气体的恒星反馈。我们通过从光学图像中去除一个光滑的圆盘来识别星系中的恒星形成区域。我们构建像素的恒星年龄和恒星质量的表面密度在这些地区的像素地图，通过比较他们观察到的颜色与简单的恒星星族与STARBURST 99合成。我们发现，一个较老的爆发发生在大约1亿年前的内部4 kpc和一个年轻的爆发发生在过去的10万年，主要是在银河系中心半径4和8 kpc之间。我们分析了居住在IC 2574的HI洞中的恒星星族。我们的研究结果表明，即使在显着的光度深度的LBT数据，有没有明确的一对一的关联之间观察到的HI孔和最近爆发的恒星形成的IC 2574。年轻爆发期间形成的恒星星族通常位于HI黑洞的外围，并且被认为比黑洞的动力学年龄年轻。黑洞膨胀的动能平均占黑洞内年轻恒星星族的恒星风和超新星爆炸释放的总能量的10%。借助分布在星系中的控制孔径，我们估计以局部速度色散形式储存在HI气体中的动能约占恒星总能量的35%。
英文摘要：
We present deep imaging of the star-forming dwarf galaxy IC2574 in the M81 group taken with the Large Binocular Telescope in order to study in detail the recent star-formation history of this galaxy and to constrain the stellar feedback on its HI gas. We identify the star-forming areas in the galaxy by removing a smooth disk component from the optical images. We construct pixel-by-pixel maps of stellar age and stellar mass surface density in these regions by comparing their observed colors with simple stellar populations synthesized with STARBURST99. We find that an older burst occurred about 100 Myr ago within the inner 4 kpc and that a younger burst happened in the last 10 Myr mostly at galactocentric radii between 4 and 8 kpc. We analyze the stellar populations residing in the known HI holes of IC2574. Our results indicate that, even at the remarkable photometric depth of the LBT data, there is no clear one-to-one association between the observed HI holes and the most recent bursts of star formation in IC2574. The stellar populations formed during the younger burst are usually located at the periphery of the HI holes and are seen to be younger than the holes dynamical age. The kinetic energy of the holes expansion is found to be on average 10% of the total stellar energy released by the stellar winds and supernova explosions of the young stellar populations within the holes. With the help of control apertures distributed across the galaxy we estimate that the kinetic energy stored in the HI gas in the form of its local velocity dispersion is about 35% of the total stellar energy.
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