Small jets in radio‐loud hot DOGs

Abstract

We address the impact of young radio jets on the ISM and star formation in a sample of radiatively efficient, highly obscured, radio AGN with look back times that place them near the peak of the galaxy and BH building era, z ∼ 1–3. By selecting systems with a high mid‐infrared (MIR) luminosity we aim to identify radiatively efficient (“quasar‐mode” or “radiative‐mode”) AGN in a peak fueling phase, and by selecting compact radio sources we favor young or re‐generated radio jets which are confined within the hosts. By selecting AGN which are very red through the optical‐MIR we favor highly obscured systems likely to have been recently merger‐triggered and still in the pre‐blow‐out phase of AGN feedback into the surrounding ISM. ALMA imaging at 345 GHz of 49 sources has revealed that they are accretion dominated, relative to star formation, with luminosities reaching 1014 L⊙. Extensive VLA imaging at 8–10 GHz in both A‐array and B‐array for 155 sources reveals that the majority of these powerful radio systems are compact on <2–5 kpc scales while some have resolved structures on 3–25 kpc scales, and a small number have giant radio lobes on hundreds of kpc scales. The majority of the GHz range radio SEDs are typical of optically thin synchrotron, however for the 34 sources with data at more than 2 frequencies, 40% are likely to be CSS, GPS, or HFP sources. VLBA imaging of 62 sources reveals varied morphologies, from unresolved sources to complex multicomponent 1–10 mas scale structures. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Revolutionizing Our Understanding of AGN Feedback and its Importance to Galaxy Evolution in the Era of the Next Generation Very Large Array

“…Currently operating radio facilities, such as the VLA and ALMA, are beginning to perform pioneering studies of ra-dio jets and the circumnuclear gas in the vicinity of AGNs (García-Burillo et al 2014;Morganti et al 2015a;Lonsdale et al 2016;Russell et al 2017). Indeed, the full scientific potential of the VLA and ALMA for improving our understanding of jet-ISM feedback has yet to be reached.…”

The environments of luminous radio-WISE selected infrared galaxies

“…Further selections are made for radio-loudness of −1 < log(F 22 µm /F 22 cm ) < 0.1 using NVSS and WISE. The radio-WISE galaxies are selected as radiointermediate in power with compact emission to reduce the effect of synchrotron emission on IR-sub-millimeter fluxes and it is likely that these galaxies harbour radio jets from the core regions (Lonsdale et al 2016). The sample could represent the early stages of luminous quasars, which include compact, young radio emission and powerful IR emission, consistent with dust enshrouded AGN, see Lonsdale et al (2015).…”

The black hole masses of extremely luminous radio-WISE selected galaxies

“…The dashed red line represents the mid-IR colour selection criteria (Lonsdale et al 2015) and demonstrates the ability to select all galaxies significantly redder than the main WISE population, and extremely bright in the W2 band. Rejection of extended radio-loud systems ensures we target young radio jets still confined to their hosts, confirmed by follow-up VLA snapshots (Lonsdale et al 2016).…”

“…Here, we targeted the reddest AGN in the mid/near-IR and therefore observe highly-obscured systems, likely within their peak fuelling phases (Lonsdale et al 2016). Our VLT-derived redshift distribution of 𝑧 ≈ 1−3, as shown by the inserted histogram in Fig.…”