Four hot DOGs eaten up with the EVN

Frey, Sándor and Paragi, Z. and Gabányi, Krisztina Éva and An, T. (2015) Four hot DOGs eaten up with the EVN. POS - PROCEEDINGS OF SCIENCE. ISSN 1824-8039

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Abstract

Hot dust-obscured galaxies (hot DOGs) are a rare class of hyperluminous infrared galaxies re- cently identified with the Wide-field Infrared Survey Explorer (WISE) satellite. The majority of the ∼1000-member all-sky population should be at high redshifts (z ∼ 2 − 3), at the peak of star formation in the history of the Universe. This class most likely represents a short phase during galaxy merging and evolution, a transition from starburst- to AGN-dominated phases. For the first time, we observed four hot DOGs with known mJy-level radio emission using the European VLBI Network (EVN) at 1.7 GHz, in a hope to find compact radio features characteristic to AGN activity. All four target sources are detected at ∼15–30 mas angular resolution, confirming the presence of an active nucleus. The sources are spatially resolved, i.e. the flux density of the VLBI-detected components is smaller than the total flux density, suggesting that a fraction of the radio emission originates from larger-scale (partly starburst-related) activity. Here we show the preliminary results of our e-EVN observations made in 2014 February, and discuss WISE J1814+3412, an object with kpc-scale symmetric radio structure, in more detail.

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