UV-luminous, star-forming hosts of z ∼ 2 reddened quasars in the Dark Energy Survey

Wethers, Clare; Banerji, M.; Hewett, Paul C.; Lemon, C.; McMahon, R. G.; Reed, S. L.; Shen, Yue; Abdalla, F. B.; Benoit-Lévy, A.; Buckley-Geer, E.; Capozzi, D.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; D’Andrea, C. B.; Costa, L. N. da; DePoy, D. L.; Desai, S.; Doel, P.; Flaugher, B.; Fosalba, P.; Frieman, Joshua A.; García-Bellido, J.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutiérrez, G.; Honscheid, K.; James, D. J.; Jeltema, T.; Kuêhn, K.; Kuhlmann, S.; Kuropatkin, N.; Lima, M.; Maia, M. A. G.; Marshall, J. L.; Martini, Paul; Menanteau, F.; Miquel, R.; Nichol, R. C.; Nord, B.; Plazas, A. A.; Romer, A. K.; Sánchez, E.; Scarpine, V.; Schindler, R. H.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, M.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarlè, G.; Walker, A. R.

doi:10.1093/mnras/stx3332

Cited by 12 publications

(18 citation statements)

References 72 publications

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“…The total model can be reddened using a quasar extinction curve with the E(B − V ) as a free parameter. The extinction curve is the same as used in Temple et al (2019) and Wethers et al (2018). However, we do not interpret the modest range of derived E(B − V ) values as primarily resulting from dust reddening; rather it introduces flexibility to allow the model to account for slight variations in the quasar continuum slope.…”

Section: Parametric Modelmentioning

confidence: 99%

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Temple

Banerji

Hewett

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Using data from SDSS, UKIDSS and WISE, we investigate the properties of the high-frequency cutoff to the infrared emission in ≃5000 carefully selected luminous (Lbol ∼ 1047) type 1 quasars. The strength of ≃2 μm emission, corresponding to emission from the hottest ($T>1200\rm \, K$) dust in the sublimation zone surrounding the central continuum source, is observed to correlate with the blueshift of the C iv λ1550 emission line. We therefore find that objects with stronger signatures of nuclear outflows tend to have a larger covering fraction of sublimation-temperature dust. When controlling for the observed outflow strength, the hot dust covering fraction does not vary significantly across our sample as a function of luminosity, black hole mass or Eddington fraction. The correlation between the hot dust and the C iv line blueshifts, together with the lack of correlation between the hot dust and other parameters, therefore provides evidence of a link between the properties of the broad emission line region and the infrared-emitting dusty regions in quasars.

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Section: Parametric Modelmentioning

confidence: 99%

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Temple

Banerji

Hewett

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Later, in Section 3.2.1, we discuss the potential effects of this quasar contamination on our results. Two of the three quasars, ULASJ2200+0056 and ULASJ2315+0143 also showed evidence for residing in star-forming host galaxies based on our rest-frame ultraviolet detections of the quasar hosts in the Dark Energy Survey (Wethers et al 2018). The ultravioletderived star formation rates for these two quasars are among the highest in our sample -SFR UV ∼ 200 − 400M yr −1 .…”

Section: Dust-obscured Star Formationmentioning

confidence: 75%

“…In Wethers et al (2018), we explored the link between star formation as traced by rest-frame ultraviolet (UV) emis-sion and quasar luminosity in a sample of luminous, yet dust-obscured quasars from (Banerji et al 2012(Banerji et al , 2015a thought to be seen during the blowout phase. These socalled heavily reddened quasars have dust extinctions of A V 2 − 6 mags, comparable to what is seen in the submillimetre galaxy (SMG) population (Takata et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study, we found that these reddened quasars reside in prodigiously star-forming hosts (SFR UV ∼ 100 M yr −1 ), with the most luminous quasars residing in the most actively star-forming host galaxies. However, the rest-frame UV wavelengths considered in Wethers et al (2018) trace only the unobscured component of the star formation in the host -potentially accounting for only a small fraction of the total. Long-wavelength observations in the far infrared and at sub-millimetre (sub-mm) wavelengths, tracing cool dust emission, offer the opportunity to study the obscured components of star formation in these systems (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we seek to directly test whether the dust obscuration towards the quasar continuum seen in our previously studied population of z ∼ 2 heavily reddened quasars (Banerji et al 2012(Banerji et al , 2015aWethers et al 2018) is directly linked to the level of obscured star formation in the quasar host galaxy. To this end we have conducted a flux-limited 850µm survey with SCUBA-2 of our heavily reddened quasar population.…”

Section: Introductionmentioning

confidence: 99%

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A SCUBA-2 850 μm survey of heavily reddened quasars at z ∼ 2

Wethers

Banerji

Hewett

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present new 850µm SCUBA-2 observations for a sample of 19 heavily reddened Type-I quasars at redshifts z ∼2 with dust extinctions of A V 2 − 6 mag. Three of the 19 quasars are detected at >3σ significance corresponding to an 850µm flux-limit of 4.8 mJy. Assuming the 850µm flux is dominated by dust heating due to star formation, very high star formation rates (SFR) of ∼2500-4500 M yr −1 in the quasar host galaxies are inferred. Even when considering a large contribution to the 850µm flux from dust heated by the quasar itself, significant SFRs of ∼600-1500 M yr −1 are nevertheless inferred for two of the three detected quasars. We stack the remaining 16 heavily reddened quasars and derive an average 3σ upper limit on the SFRs in these quasar host galaxies of <880 M yr −1 . The number counts of sub-mm galaxies in the total survey area (134.3 arcmin 2 ) are consistent with predictions from blank-field surveys. There are, however, individual quasars where we find evidence for an excess of associated sub-mm galaxies. For two quasars, higher spatial resolution and spectroscopic ALMA observations confirm the presence of an excess of sub-mm sources. We compare the 850µm detection rate of our quasars to both unobscured, ultraviolet luminous quasars as well as the much more obscured population of mid-infrared luminous Hot Dust Obscured Galaxies (HotDOGs). When matched by luminosity and redshift, we find no significant differences in the 850µm flux densities of these various quasar populations given the current small sample sizes.

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The multiwavelength properties of red QSOs: Evidence for dusty winds as the origin of QSO reddening

Rivera

Alexander

Rosario

et al. 2021

A&A

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Fundamental differences in the radio properties of red quasars (QSOs), as compared to blue QSOs, have been recently discovered, positioning them as a potential key population in the evolution of galaxies and black holes across cosmic time. To elucidate the nature of these objects, we exploited a rich compilation of broad-band photometry and spectroscopic data to model their spectral energy distributions (SEDs) from the ultraviolet to the far-infrared and characterise their emission-line properties. Following a systematic comparison approach, we characterise the properties of the QSO accretion, obscuration, and host galaxies in a sample of ∼1800 QSOs at 0.2 < z < 2.5, classified into red and control QSOs and matched in redshift and luminosity. We find no strong differences in the average multiwavelength SEDs of red and control QSOs, other than the reddening of the accretion disk expected by the colour selection. Additionally, no clear link can be recognised between the reddening of QSOs and the interstellar medium as well as star formation properties of their host galaxies. Our modelling of the infrared emission using dusty torus models suggests that the dust distributions and covering factors in red QSOs are strikingly similar to those of the control sample, inferring that the reddening is not related to the torus and orientation effects. Interestingly, we detect a significant excess of infrared emission at rest-frame 2−5 μm, which shows a direct correlation with optical reddening. To explain its origin, we investigated the presence of outflow signatures in the QSO spectra, discovering a higher incidence of broad [O III] wings and high C IV velocity shifts (> 1000 km s−1) in red QSOs as compared to the control sample. We find that red QSOs that exhibit evidence for high-velocity wind components present a stronger signature of the infrared excess, suggesting a causal connection between QSO reddening and the presence of hot dust distributions in QSO winds. We propose that dusty winds at nuclear scales are potentially the physical ingredient responsible for the optical colours in red QSOs, as well as a key parameter for the regulation of accretion material in the nucleus.

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UV-luminous, star-forming hosts of z ∼ 2 reddened quasars in the Dark Energy Survey

Cited by 12 publications

References 72 publications

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

Exploring the link between C iv outflow kinematics and sublimation-temperature dust in quasars

A SCUBA-2 850 μm survey of heavily reddened quasars at z ∼ 2

The multiwavelength properties of red QSOs: Evidence for dusty winds as the origin of QSO reddening

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