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NGC 5252: a pair of radio-emitting active galactic nuclei?

Xiaolong Yang ; Jun Yang (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Zsolt Paragi ; Xiang Liu ; Tao An ; Stefano Bianchi ; Luis C. Ho ; Lang Cui ; Wei Zhao ; Xiaocong Wu
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 464 (2016), 1, p. L70-L74.
[Artikel, refereegranskad vetenskaplig]

The X-ray source CXO J133815.6+043255 has counterparts in the UV, optical, and radio bands. Based on the multiband investigations, it has been recently proposed by Kim et al. as a rarely seen off-nucleus ultraluminous X-ray (ULX) source with a black hole mass of ≥104 M⊙ in the nearby Seyfert galaxy NGC 5252. To explore its radio properties at very high angular resolution, we performed very long-baseline interferometry (VLBI) observations with the European VLBI Network (EVN) at 1.7 GHz. We find that the radio counterpart is remarkably compact among the known ULXs. It does not show a resolved structure with a resolution of a few milliarcsecond (mas), and the total recovered flux density is comparable to that measured in earlier sub-arcsecond-resolution images. The compact radio structure, the relatively flat spectrum, and the high radio luminosity are consistent with a weakly accreting supermassive black hole in a low-luminosity active galactic nucleus. The nucleus of NGC 5252 itself has similar radio properties. We argue that the system represents a relatively rare pair of active galactic nuclei, where both components emit in the radio.

Nyckelord: galaxies: individual: NGC 5252 galaxies: jets radio continuum: galaxies X-rays: individual: CXO J133815.6+043255

Corresponding author: Jun Yang

Denna post skapades 2016-11-02. Senast ändrad 2017-09-07.
CPL Pubid: 244619


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)


Astronomi, astrofysik och kosmologi

Chalmers infrastruktur

Onsala rymdobservatorium



Denna publikation är ett resultat av följande projekt:

Advanced Radio Astronomy in Europe (RADIONET3) (EC/FP7/283393)

NEXPReS- Novel EXplorations Pushing Robust e-VLBI Services (NEXPReS) (EC/FP7/261525)