The radio galaxy K-z relation: The $\mathsf{10^{12}}~$M$\mathsf{_\odot}$ mass limit - Masses of galaxies from the L$\mathsf{_{K}}$ luminosity, up to z $\mathsf{> 4}$
The radio galaxy K-z relation: The $\mathsf{10^{12}}~$M$\mathsf{_\odot}$ mass limit - Masses of galaxies from the L$\mathsf{_{K}}$ luminosity, up to z $\mathsf{> 4}$
复制标题
射电星系 K-z 关系： $mathsf{10^{12}}~$M$mathsf{_odot}$ 质量极限 - 来自 L$mathsf{_{K}}$ 光度的星系质量，
DOI：
10.1051/0004-6361:20031717
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发表时间：
2003
影响因子：
6.5
通讯作者：
E. Moy
中科院分区：
文献类型：
--
作者：
B. Rocca;D. L. Borgne;C. Breuck;M. Fioc;E. Moy
在哈勃K带图中，强射电星系的窄K-z关系通常被归因于大质量椭圆星系的恒星群。因为它覆盖了很大范围的红移($0 z，用于估计有效的光度学红移。然后导出了初始气云的重子质量$M{{Rm bar}}$。对于重子质量为$M{\rm bar，max}}\simeq 10^{12}~M_\odot$的椭圆星系，K-z关系在我们的演化场景中得到了显著的再现，最高可达$z=4$。$M_{{\rm bar，max}}$也是所有类型星系的最大质量极限。使用另一个初始质量函数(IMF)，即使是头重脚轻的初始质量函数，也不会改变我们的结论。在$z>；4$观测到的$M_{{\rm bar，max}}$的高值意味着在早期就已经形成了大质量的云。我们还发现，该极限与受冷却调节的自引力云的临界质量类似(Rees&Ostriker[引用]；Silk[引用])。此外，临界大小rr_(Rm)Crit}\simeq 75~(Rm)kpc与遥远射电星系周围Lyα晕的典型直径非常接近。这证实了基于K带光度的重子质量测定方法的有效性。一个有待回答的令人费解的问题是，在$z=4美元时形成如此大质量的星系所需的质量积累的短时间尺度。我们用质量极限的不确定度来讨论K-z关系的色散。文中还讨论了活动核的存在与大质量恒星之间的联系。
The narrow K - z relation of powerful radio galaxies in the Hubble K -band diagram is often attributed to the stellar populations of massive elliptical galaxies. Because it extends over a large range of redshifts ($0 z , used to estimate valid photometric redshifts. The baryonic mass of the initial gas cloud $M_{{\rm bar}}$ is then derived. The K - z relation is remarkably reproduced by our evolutionary scenario for elliptical galaxies of baryonic mass $M_{{\rm bar,max}} \simeq 10^{12}~M_\odot$, at all z up to $z = 4$. $M_{{\rm bar,max}}$ is also the maximum mass limit of all types of galaxies. Using another initial mass function (IMF), even a top-heavy one, does not alter our conclusions. The high value of $M_{{\rm bar,max}}$ observed at $z > 4$ implies that massive clouds were already formed at early epochs. We also find that the $M_{{\rm bar,max}}$ limit is similar to the critical mass $M_{{\rm crit}}$ of a self-gravitating cloud regulated by cooling (Rees & Ostriker [CITE]; Silk [CITE]). Moreover, the critical size $r_{{\rm crit}}\simeq 75~{\rm kpc}$ is remarkably close to the typical diameter of Ly α haloes surrounding distant radio galaxies. This confirms the validity of the method of baryonic mass determination based on the K -band luminosity. A puzzling question that remains to be answered is the short time-scale of mass-accumulation required to form such massive galaxies at $z = 4$. We discuss the dispersion of the K - z relation in terms of uncertainties on the mass limit. The link between the presence of the active nucleus and a large stellar mass is also discussed.