NEAR-INFRARED ADAPTIVE OPTICS IMAGING OF INFRARED LUMINOUS GALAXIES: THE BRIGHTEST CLUSTER MAGNITUDE–STAR FORMATION RATE RELATION
NEAR-INFRARED ADAPTIVE OPTICS IMAGING OF INFRARED LUMINOUS GALAXIES: THE BRIGHTEST CLUSTER MAGNITUDE–STAR FORMATION RATE RELATION
复制标题
红外发光星系的近红外自适应光学成像：最亮的星团星等与恒星形成率的关系
DOI：
10.1088/2041-8205/775/2/l38
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Ryder
中科院分区：
文献类型：
--
作者：
Z. Randriamanakoto;A. Escala;P. Väisänen;E. Kankare;J. Kotilainen;S. Mattila;S. Ryder
我们首次在近红外（NIR）波段建立了星系中最亮的超级星团（SSC）星等与主恒星形成速率（SFR）之间的关系。数据来自利用k波段自适应光学成像的约40个发光红外星系（ligs）和星暴的统计样本。在将观测到的关系扩展到更长的波长时，受消光效应的影响较小，它也推动了更高的srr。我们发现的关系，MK ~−2.6log SFR，与之前在光学和较低SFR下推导的关系相似。然而，它不符合单一光学到近红外颜色转换的光学关系，表明系统的消光和/或年龄效应。虽然这种关系与样本大小的解释大致一致，但我们认为这种关系的物理原因也是可能的。特别是，关系中的散点比纯随机抽样所期望的要小，这强烈表明了物理约束。我们还推导了一个可量化的关系，将星团内部效应和宿主SFR属性联系在一起，以可能解释观测到的最亮的SSC星等与SFR依赖性。
We have established a relation between the brightest super star cluster (SSC) magnitude in a galaxy and the host star formation rate (SFR) for the first time in the near-infrared (NIR). The data come from a statistical sample of ∼40 luminous IR galaxies (LIRGs) and starbursts utilizing K-band adaptive optics imaging. While expanding the observed relation to longer wavelengths, less affected by extinction effects, it also pushes to higher SFRs. The relation we find, MK ∼ −2.6log SFR, is similar to that derived previously in the optical and at lower SFRs. It does not, however, fit the optical relation with a single optical to NIR color conversion, suggesting systematic extinction and/or age effects. While the relation is broadly consistent with a size-of-sample explanation, we argue physical reasons for the relation are likely as well. In particular, the scatter in the relation is smaller than expected from pure random sampling strongly suggesting physical constraints. We also derive a quantifiable relation tying together cluster-internal effects and host SFR properties to possibly explain the observed brightest SSC magnitude versus SFR dependency.