Coexistence of a non-thermal jet and a complex ultra-fast X-ray outflow in a moderately luminous AGN⋆
1 INAF Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
2 INAF Istituto di Astrofisica e Planetologia Spaziali di Roma, via del Fosso del Cavaliere 100, 00133 Roma, Italy
3 CONACYT – Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis E. Erro 1, Tonantzintla, 72840 Puebla, Mexico
4 Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Apartado Postal 70264, 04510 Mexico D.F., Mexico
5 ESAC, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
6 Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, 252-5210 Kanagawa, Japan
7 SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Received: 29 November 2016
Accepted: 25 January 2017
Context. Recent XMM-Newton observations have revealed that IRAS 17020+4544 is a very unusual example of black hole wind-produced feedback by a moderately luminous AGN in a spiral galaxy.
Aims. Since the source is known to be a radio emitter, we investigated the presence and the properties of a non-thermal component.
Methods. We observed IRAS 17020+4544 with the Very Long Baseline Array at 5, 8, 15, and 24 GHz within a month of the 2014 XMM-Newton observations. We further analysed archival data taken in 2000 and 2012.
Results. We detect the source at 5 GHz and on short baselines at 8 GHz. At 15 and 24 GHz, the source is below our baseline sensitivity for fringe fitting, indicating a lack of prominent compact features. The morphology is that of an asymmetric double, with significant diffuse emission. The spectrum between 5 and 8 GHz is rather steep (S(ν) ~ ν− (1.0 ± 0.2)). Our reanalysis of the archival data at 5 and 8 GHz provides results consistent with the new observations, suggesting that flux density and structural variability are not important in this source. We put a limit on the separation speed between the main components of <0.06c.
Conclusions. IRAS 17020+4544 shows interesting features of several classes of objects: its properties are typical of compact steep spectrum sources, low power compact sources, and radio-emitting narrow line Seyfert 1 galaxies. However, it cannot be classified in any of these categories, and remains a one-of-a-kind object.
Key words: galaxies: Seyfert / galaxies: nuclei / galaxies: jets / galaxies: active
Reduced images (FITS files) are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/600/A87 .
© ESO, 2017