Radio Jet Feedback and Star Formation in Heavily Obscured, Hyperluminous Quasars at Redshifts ∼ 0.5–3. I. Alma Observations

Abstract

We present ALMA 870 µm (345 GHz) data for 49 high redshift (0.47< z <2.85), luminous (11.7 < log(L bol /L ) < 14.2) radio-powerful AGN, obtained to constrain cool dust emission from starbursts concurrent with highly obscured radiative-mode black hole (BH) accretion in massive galaxies which possess a small radio jet. The sample was selected from WISE with extremely steep (red) midinfrared (MIR) colors and with compact radio emission from NVSS/FIRST. Twenty-six sources are detected at 870 µm, and we find that the sample has large mid-to far-infrared luminosity ratios consistent with a dominant and highly obscured quasar. The rest-frame 3 GHz radio powers are 24.7 < log(P 3.0GHz /W Hz −1 ) < 27.3, and all sources are radio-intermediate or radio-loud. BH mass estimates are 7.7 < log(M BH /M ) < 10.2. The rest frame 1-5 µm SEDs are very similar to the "Hot DOGs" (Hot Dust Obscured Galaxies), and steeper (redder) than almost any other known extragalactic sources. ISM masses estimated for the ALMA detected sources are 9.9 < log(M ISM /M ) <11.75 assuming a dust temperature of 30K. The cool dust emission is consistent with star formation rates (SFRs) reaching several thousand M yr −1 , depending on the assumed dust temperature, however we cannot rule out the alternative that the AGN powers all the emission in some cases. Our best constrained source has radiative transfer solutions with ∼ equal contributions from an obscured AGN and a young (10-15 Myr) compact starburst.

The discovery of gas-rich, dusty starbursts in luminous reddened quasars atz∼ 2.5 with ALMA

“…The WISE HotDOGs therefore do not seem to fit Figure 7. Redshift versus 850µm flux density for blue quasars , reddened quasars (This Work, Feruglio et al 2014;Brusa et al 2015) and WISE HotDOGs (Lonsdale et al 2015;Jones et al 2014Jones et al , 2015. In all cases downward triangles denote upper limits and the large blue open circle shows the stacked 850µm flux of the blue quasars from Priddey et al (2003).…”

“…Eisenhardt et al 2012). We use as the basis for comparison, the SCUBA-2 850µm and ALMA 870µm flux densities of the spectroscopically confirmed WISE HotDOGs at 1.5 < z < 3.0 from Jones et al (2014Jones et al ( , 2015 and Lonsdale et al (2015). These studies provide a sample of 42 HotDOGs with secure spectroscopic redshifts overlapping the redshift range of both our reddened quasar sample and the Priddey et al (2003) optical quasars.…”

“…In all cases downward triangles denote upper limits and the large blue open circle shows the stacked 850µm flux of the blue quasars from Priddey et al (2003). The dashed lines mark the range in 2σ flux limits for the SCUBA survey ) and the ALMA survey (Lonsdale et al 2015).…”

Overdensities of SMGs around WISE-selected, ultraluminous, high-redshift AGNs

“…Another population of luminous, dusty, WISE -selected AGNs were found by Lonsdale et al (2015), by combining WISE and National Radio Astronomy Observatory (NRAO) Very Large Array (VLA) Sky Survey (NVSS) (Condon et al 1998) and/or Faint Images of the Radio Sky at Twenty-cm (FIRST) (Becker et al 1995). They were selected in a similar method in the mid-IR, and are a similarly high luminosity, dust-obscured population and in this paper are known as WISE /radio AGNs.…”

“…WISE is able to find luminous, dusty, highredshift, active galaxies because the hot dust heated by AGN and/or starburst activity can be traced using the WISE 12 µm (W3) and 22 µm (W4) bands. Eisenhardt et al (2012), Bridge et al (2013) and Lonsdale et al (2015) have shown that WISE can find different classes of interesting, luminous, high-redshift, dust-obscured AGN. Eisenhardt et al (2012) and Wu et al (2012) observed galaxies with faint or undetectable flux densities in the 3.4 µm (W1) and 4.6 µm (W2) bands, and well detected fluxes in the W3 and/or W4 bands, with a radio blind selection, giving a "W1W2-dropout" selection yielding hot, dust obscured galaxies (Hot DOGs).…”