HALF OF THE MOST LUMINOUS QUASARS MAY BE OBSCURED: INVESTIGATING THE NATURE OF<i>WISE</i>-SELECTED HOT DUST-OBSCURED GALAXIES

Assef, Roberto J.; Eisenhardt, Peter; Stern, Daniel; Tsai, Chao-Wei; Wu, Jingwen; Wylezalek, Dominika; Blain, A. W.; Bridge, Carrie; Donoso, Emilio; Gonzales, A.; Griffith, R. L.; Jarrett, T. H.

doi:10.1088/0004-637x/804/1/27

Cited by 175 publications

(358 citation statements)

References 87 publications

Supporting

Mentioning

329

Contrasting

Order By: Relevance

“…In conclusion, the evolutionary scenario drawn by Sanders et al (1988a) still remains puzzling; more work must be done in order to understand whether or not FeLoBAL QSOs are transition objects, which stage of the transition they represent, and how they relate to other potential intermediate sources like Hot Dust-Obscured Galaxies (Assef et al 2014) and WISE-/radio-selected AGN (Jones et al 2015).…”

Section: Discussionmentioning

confidence: 99%

A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs?

Violino¹,

Coppin²,

Stevens³

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

It is thought that a class of broad absorption line (BAL) QSOs, characterised by Fe absorption features in their UV spectra (called 'FeLoBALs'), could mark a transition stage between the end of an obscured starburst event and a youthful QSO beginning to shed its dust cocoon, where Fe has been injected into the interstellar medium by the starburst. To test this hypothesis we have undertaken deep SCUBA-2 850 µm observations of a sample of 17 FeLoBAL QSOs with 0.89 z 2.78 and -23.31 M B -28.50 to directly detect an excess in the thermal emission of the dust which would probe enhanced star-formation activity. We find that FeLoBALs are not luminous sources in the submillimetre, none of them are individually detected at 850 µm, nor as a population through stacking (F s = 1.14 ± 0.58 mJy). Statistical and survival analyses reveal that FeLoBALs have sub-mm properties consistent with BAL and non-BAL QSOs with matched redshifts and magnitudes. An SED fitting analysis shows that the FIR emission is dominated by AGN activity, and a starburst component is required only in 6/17 sources of our sample; moreover the integrated total luminosity of 16/17 sources is L 10 12 L , high enough to classify FeLoBALs as infrared luminous.In conclusion, we do not find any evidence in support of FeLoBAL QSOs being a transition population between a ULIRG and an unobscured QSO; in particular, FeLoBALs are not characterized by a cold starburst which would support this hypothesis.

show abstract

Section: Discussionmentioning

confidence: 99%

A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs?

Violino¹,

Coppin²,

Stevens³

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

show abstract

“…As noted earlier, the GAMA point-source exclusion eliminates most high-z QSOs and those in which the AGN is much brighter than the host; consequently, the AGNs in this study will have hosts that are detected by WISE and are primarily nearby low-power AGN and Seyferts. There are many studies of AGN and QSOs at high redshifts-including using WISE (e.g., Donoso et al 2014) -that suggest that powerful AGN preferentially exist within overdense environments and would therefore exhibit strong angular clustering; see for example the recent AGN clustering work from Jones et al (2015), Assef et al (2015), Chehade et al (2016), andMendez et al (2016). Given that GAMA is not optimal for studying AGN and the completeness is therefore poor, the clustering results should be interpreted with caution.…”

Section: Galaxy Angular Clusteringmentioning

confidence: 99%

Galaxy and Mass Assembly (GAMA): Exploring the WISE Web in G12

Jarrett

Cluver

Magoulas

et al. 2017

ApJ

Self Cite

120

151

View full text Add to dashboard Cite

We present an analysis of the mid-infrared Wide-field Infrared Survey Explorer (WISE) sources seen within the equatorial GAMA G12 field, located in the North Galactic Cap. Our motivation is to study and characterize the behavior of WISE source populations in anticipation of the deep multiwavelength surveys that will define the next decade, with the principal science goal of mapping the 3D large-scale structures and determining the global physical attributes of the host galaxies. In combination with cosmological redshifts, we identify galaxies from their WISE W1 (3.4 μm) resolved emission, and we also perform a star-galaxy separation using apparent magnitude, colors, and statistical modeling of star counts. The resulting galaxy catalog has ;590,000 sources in 60 deg 2 , reaching a W1 5σ depth of 31 μJy. At the faint end, where redshifts are not available, we employ a luminosity function analysis to show that approximately 27% of all WISE extragalactic sources to a limit of 17.5 mag (31 μJy) are at high redshift, > z 1. The spatial distribution is investigated using two-point correlation functions and a 3D source density characterization at 5 Mpc and 20 Mpc scales. For angular distributions, we find that brighter and more massive sources are strongly clustered relative to fainter sources with lower mass; likewise, based on WISE colors, spheroidal galaxies have the strongest clustering, while late-type disk galaxies have the lowest clustering amplitudes. In three dimensions, we find a number of distinct groupings, often bridged by filaments and superstructures. Using special visualization tools, we map these structures, exploring how clustering may play a role with stellar mass and galaxy type.

show abstract

“…Another class of heavily dust-obscured galaxies, known as Hot DOGs, has been recently identified by WISE (Assef et al 2015, and references therein). Hot DOGs are characterised by high luminosity (L bol 10 47 erg/s) and large obscuration (up to AV ∼ 50 mag).…”

Section: Observational Samplesmentioning

confidence: 99%

AGN–starburst evolutionary connection: a physical interpretation based on radiative feedback

Ishibashi

Fabian

2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

Observations point towards a close connection between nuclear starbursts, active galactic nuclei (AGN), and outflow phenomena. An evolutionary sequence, starting from a dust-obscured ultra-luminous infrared galaxy and eventually leading to an unobscured optical quasar, has been proposed and discussed in the literature. AGN feedback is usually invoked to expel the obscuring gas and dust in a blow-out event, but the underlying physical mechanism remains unclear. We consider AGN feedback driven by radiation pressure on dust, which directly acts on the obscuring dusty gas. We obtain that radiative feedback can potentially disrupt dense gas in the infrared-optically thick regime, and that an increase in the dust-to-gas fraction leads to an increase in the effective Eddington ratio. Thus the more dusty gas is preferentially expelled by radiative feedback, and the central AGN is prone to efficiently remove its own obscuring dust cocoon. Large amounts of dust imply heavy obscuration but also powerful feedback, suggesting a causal link between dust obscuration and blow-out. In this picture, AGN feedback and starburst phenomena are intrinsically coupled through the production of dust in supernova explosions, leading to a natural interpretation of the observed evolutionary path.

show abstract

HALF OF THE MOST LUMINOUS QUASARS MAY BE OBSCURED: INVESTIGATING THE NATURE OFWISE-SELECTED HOT DUST-OBSCURED GALAXIES

Cited by 175 publications

References 87 publications

A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs?

A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs?

Galaxy and Mass Assembly (GAMA): Exploring the WISE Web in G12

AGN–starburst evolutionary connection: a physical interpretation based on radiative feedback

Contact Info

Product

Resources

About