ACCRETION PROPERTIES OF HIGH- AND LOW-EXCITATION YOUNG RADIO GALAXIES

被引：21
|
作者：
Son, Donghoon [1 ]
Woo, Jong-Hak [1 ]
Kim, Sang Chul [2 ]
Fu, Hai [3 ]
Kawakatu, Nozomu [4 ]
Bennert, Vardha N. [5 ]
Nagao, Tohru [6 ,7 ]
Park, Daeseong [1 ]
机构：
[1] Seoul Natl Univ, Dept Phys & Astron, Astron Program, Seoul 151742, South Korea
[2] Korea Astron & Space Sci Inst, Taejon 305348, South Korea
[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[4] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan
[5] Calif Polytech State Univ San Luis Obispo, Dept Phys, San Luis Obispo, CA 93407 USA
[6] Kyoto Univ, Hakubi Ctr Adv Res, Sakyo Ku, Kyoto 6068302, Japan
[7] Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 757卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
galaxies: active; galaxies: jets; galaxies: nuclei; galaxies: Seyfert; COMPACT STEEP-SPECTRUM; ACTIVE GALACTIC NUCLEI; BLACK-HOLE MASSES; RELATIVISTIC MAGNETOHYDRODYNAMIC SIMULATIONS; AGN MONITORING PROJECT; NARROW-LINE REGIONS; JET FORMATION; EMITTING GAS; EMISSION; EVOLUTION;
D O I：
10.1088/0004-637X/757/2/140
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Young radio galaxies (YRGs) provide an ideal laboratory to explore the connection between the accretion disk and radio jet thanks to their recent jet formation. We investigate the relationship between the emission-line properties, the black hole accretion rate, and the radio properties using a sample of 34 low-redshift (z < 0.4) YRGs. We classify YRGs as high-excitation galaxies (HEGs) and low-excitation galaxies (LEGs) based on the flux ratio of high-ionization to low-ionization emission lines. Using the H alpha luminosities as a proxy of accretion rate, we find that HEGs in YRGs have similar to 1 dex higher Eddington ratios than LEGs in YRGs, suggesting that HEGs have a higher mass accretion rate or higher radiative efficiency than LEGs. In agreement with previous studies, we find that the luminosities of emission lines, in particular H alpha, are correlated with radio core luminosity, suggesting that accretion and young radio activities are fundamentally connected.
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页数：13
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