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arXiv 2003.09842astro-ph.GA
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超薄侧边半导体的近红外光谱测量

Near-Infrared Photometry of Superthin Edge-on Galaxies

D. Bizyaev, A. M. Tatarnikov, N. I. Shatsky, A. E. Nadjip, M. A. Burlak, O. V. Vozyakova

摘要:

我们对49个超薄边缘星系的大样本进行了近红外测光。这些星系是根据光学光度学选择的,因为它们的恒星盘具有高的径向与垂直尺度比。近红外(NIR)H和K观测是用莫斯科国立罗蒙诺索夫大学高加索山天文台2.5米望远镜上的低温冷却照相机ASTRONICAM进行的。我们样本中的大多数星系显示出与斯隆数字巡天(SDSS)光学图像相当或更好的光度深度。我们估计了星系中恒星盘的结构参数,发现恒星盘的近红外标度高度与用光学、SDSS g、r和i估计的高度相当,而恒星盘的H和K标度长度明显短于g、r和i。我们调查,如果一个现实的尘埃分布单独可以解释的差异的尺度长度,并发现,在大多数星系的径向变化的恒星星族实际上是负责的颜色分布。后者表明盘外围的年龄较年轻,并且在超薄星系中恒星盘由内而外地形成。

英文摘要:

We perform near-infrared photometry of a large sample of 49 superthin edge-on galaxies. These galaxies are selected based on optical photometry because of high radial-to-vertical scale ratio in their stellar disks. The Near Infrared (NIR) H and K observations were conducted with the cryogenic-cooled camera ASTRONIRCAM on the 2.5m telescope at the Caucasus Mountain Observatory of Lomonosov Moscow State University. A majority of galaxies in our sample show comparable or better photometric depth than the Sloan Digital Sky Survey (SDSS) optical images. We estimate the structural parameters of stellar disks in the galaxies and find that the NIR scale height of stellar disks is comparable to that estimated from the optical, SDSS g, r and i, whereas the H and K scale length of the stellar disks is significantly shorter than in the g, r and i. We investigate if a realistic distribution of dust alone can explain the difference in the scale length and find that in the majority of the galaxies the radial variation of the stellar population is actually responsible for the color distribution. The latter suggests a younger age of the disks periphery, and the inside out building up of stellar disks in the superthin galaxies.

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