Starbursts and black hole masses in X-shaped radio galaxies: Signatures of a merger event?

被引：17

作者：

Mezcua, M. ^{[1
,2
,3
]}

Chavushyan, V. H. ^{[4
]}

Lobanov, A. P. ^{[1
]}

Leon-Tavares, J. ^{[5
]}

机构：

[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[2] Inst Astrofis Canarias, Tenerife 38200, Spain

[3] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[4] Inst Nacl Astrofis Opt & Electr, Puebla 72000, Mexico

[5] Aalto Univ, Metsahovi Radio Observ, Kylmala 02540, Finland

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 544卷

基金：

巴西圣保罗研究基金会;

关键词：

galaxies: kinematics and dynamics; galaxies: formation; galaxies: nuclei; black hole physics; DIGITAL SKY SURVEY; ACTIVE GALACTIC NUCLEI; STAR-FORMING GALAXIES; SEMIEMPIRICAL ANALYSIS; VELOCITY DISPERSION; EVOLUTION; REORIENTATION; MORPHOLOGIES; EMISSION; QUASARS;

D O I：

10.1051/0004-6361/201117724

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new spectroscopic identifications of 12 X-shaped radio galaxies and use the spectral data to derive starburst histories and masses of the nuclear supermassive black holes in these galaxies. The observations were done with the 2.1-m telescope of the Observatorio Astronomico Nacional at San Pedro Martir, Mexico. The new spectroscopic results extend the sample of X-shaped radio galaxies studied with optical spectroscopy. We show that the combined sample of the X-shaped radio galaxies has statistically higher black-hole masses and older episodes of star formation than a control sample of canonical double-lobed radio sources with similar redshifts and luminosities. The data reveal enhanced star-formation activity in the X-shaped sample on the timescales expected in galactic mergers. We discuss the results obtained in the framework of the merger scenario.

引用

页数：8

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