Dim galaxies and outer halos of galaxies missed by 2MASS? The near-infrared luminosity function and density

被引：43

作者：

Andreon, S ^{[1
]}

机构：

[1] Osserv Astron Capodimonte, INAF, I-80131 Naples, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2002年 / 382卷 / 02期

关键词：

galaxies : evolution; galaxies : clusters : general; X-rays : general;

D O I：

10.1051/0004-6361:20011636

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

By using high-resolution and deep K-s band observations of early-type galaxies of the nearby Universe and of a cluster at z = 0.3 we show that the two luminosity functions (LFs) of the local universe derived from 2MASS data miss a fair fraction of the flux of the galaxies (more than 20 to 30%) and a whole population of galaxies of central brightness fainter than the isophote used for detection, but bright enough to be included in the published LFs. In particular, the fraction of lost flux increases as the galaxy surface brightness become fainter. Therefore, the so far derived LF slopes and characteristic luminosity as well as luminosity density are underestimated. Other published near-infrared LFs miss flux in general, including the LF of the distant field computed in a 3 arcsec aperture.

引用

页码：495 / 502

页数：8

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