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arXiv 0909.2803astro-ph.CO
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超高质量星系HIZOA J0836-43的性质

Properties of the extremely HI-massive galaxy HIZOA J0836-43

Renee C. Kraan-Korteweg, Michelle Cluver, Tom H. Jarrett, Patrick A. Woudt

备注：
To appear in "Panoramic Radio Astronomy: Wide-field 1-2 GHz research on galaxy evolution", Proceedings of Science
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摘要：

对于质量极大的HI星系的性质知之甚少。它们极其稀少，并且-根据等级结构形成-现在才形成（z < 1）。即将到来的深入HI SKA探路者调查将揭示更多的问题。这将导致更好地理解它们的演化和频率，以及HI质量函数亮端的形状。最近发现的星系HIZOA J 0836 -43是HI最丰富的星系之一（M（HI）=7.5 x 10^10 Msun-也是同类星系中最近的一个。因此，它是这些难以捉摸的星系的理想本地探测器。结果从一个详细的调查，在近（IRSF）和远红外（斯皮策）的本地HI大质量星系。与其他巨大的HI星系不同，它的表面亮度并不低。该星系被发现是一个明亮的恒星爆发星系，处于恒星质量形成的早期阶段，更典型的恒星形成星系在更高的红移（z~0.7）。关于它的环境，因此可能是它形成的线索，近红外成像巡天发现HIZOAJ 0836 -43位于L* 星系中密度不足的区域-与HI质量星系优先在低密度区域发现的观察一致-然而，存在着大量的低恒星质量星系。

英文摘要：

Little is known about the properties of extremely massive HI-galaxies. They are extremely scarce and are - according to hierarchical structure formation - only forming now (z < 1). The forthcoming deep HI SKA Pathfinders surveys will uncover many more of them. This will lead to a better understanding of their evolution and frequency, and the shape of the bright end of the HI mass function. The recently discovered galaxy HIZOA J0836-43 is one of the most HI-rich galaxies (M(HI)=7.5 x 10^10Msun - and the nearest of its kind. As such it is an ideal local probe of these elusive galaxies. Results from a detailed investigation in the near- (IRSF) and far-infrared (Spitzer) of this local HI-massive galaxy are presented. Unlike other giant HI galaxies, it is not of low surface brightness. The galaxy is found to be a luminous starbursting galaxy at an unexpected early stage of stellar mass building, more typical of star-forming galaxies at higher redshift (z~0.7). With regard to its environment, hence possible clues to its formation, the near infrared imaging survey finds HIZOAJ0836-43 to lie in a region underdense in L* galaxies - consistent with the observation that HI-massive galaxies are preferentially found in low density regions - in the presence, however, of an uncommonly large number of low stellar mass galaxies.

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