Extended soft X-ray emission in 3CR radio galaxies at z < 0.3: high excitation and broad line galaxies

被引：27

作者：

Balmaverde, B. ^{[1
]}

Capetti, A. ^{[1
]}

Grandi, P. ^{[2
]}

Torresi, E. ^{[2
]}

Chiaberge, M. ^{[3
,4
,5
]}

Rodriguez Zaurin, J. ^{[6
]}

Tremblay, G. R. ^{[7
]}

Axon, D. J. ^{[8
,9
]}

Baum, S. A. ^{[10
,11
]}

Giovannini, G. ^{[3
,12
]}

Kharb, P. ^{[8
]}

Macchetto, F. D. ^{[4
]}

O'Dea, C. P. ^{[8
,13
]}

Sparks, W. ^{[4
]}

机构：

[1] Osserv Astron Torino, INAF, I-10025 Pino Torinese, Italy

[2] IASF Ist Astrofis & Fis Cosm Bologna, INAF, I-40129 Bologna, Italy

[3] Ist Radioastron Bologna, INAF, I-40129 Bologna, Italy

[4] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[5] Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA

[6] Inst Astrofis Canarias, Tenerife 38205, Spain

[7] European So Observ, D-85748 Garching, Germany

[8] Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA

[9] Univ Sussex, Sch Math & Phys Sci, Brighton BN2 9BH, E Sussex, England

[10] Carlson Ctr Imaging Sci, Rochester, NY 14623 USA

[11] Radcliffe Inst Adv Study, Cambridge, MA 02138 USA

[12] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[13] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 545卷

关键词：

galaxies: active; X-rays: galaxies; ISM: jets and outflows; HUBBLE-SPACE-TELESCOPE; OPTICAL SPECTROSCOPIC SURVEY; HST SNAPSHOT SURVEY; XMM-NEWTON; IMAGING POLARIMETRY; SOURCE COUNTERPARTS; LOW-REDSHIFT; CHANDRA OBSERVATIONS; SPECTRAL-ANALYSIS; SEYFERT-GALAXIES;

D O I：

10.1051/0004-6361/201219561

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze Chandra observations of diffuse soft X-ray emission associated with a complete sample of 3CR radio galaxies at z < 0.3. We focus on the properties of the spectroscopic sub-classes of high excitation galaxies (HEGs) and broad line objects (BLOs). Among the 33 HEGs we detect extended (or possibly extended) emission in about 40% of the sources; the fraction is even higher (8/10) when restricting the analysis to the objects with exposure times larger than 10 ks. In the 18 BLOs, extended emission is seen only in two objects; this lower detection rate can be ascribed to the presence of their bright X-ray nuclei that easily outshine any genuine diffuse emission. A very close correspondence between the soft X-ray and optical line morphology emerges. We also find that the ratio between [O III] and extended soft X-ray luminosity is confined within a factor of 2 around a median value of 5. Both results are similar to what is seen in Seyfert galaxies. We discuss different processes that could explain the soft X-ray emission and conclude that the photoionization of extended gas, coincident with the narrow line region, is the favored mechanism.

引用

页数：15

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Extended soft X-ray emission in 3CR radio galaxies at z &lt; 0.3: high excitation and broad line galaxies

Extended soft X-ray emission in 3CR radio galaxies at z < 0.3: high excitation and broad line galaxies