Physical Properties of Hyperluminous, Dust-obscured Quasars at z ∼ 3: Multiwavelength Spectral Energy Distribution Analysis and Cold Gas Content Revealed by ALMA

We present a UV to millimeter spectral energy distribution (SED) analysis of 16 hyperluminous, dust-obscured quasars at z ∼ 3, selected by the Wide-field Infrared Survey Explorer. We aim to investigate the physical properties of these quasars, with a focus on their molecular gas content. We decompos...

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Veröffentlicht in:The Astrophysical journal Jg. 964; H. 1; S. 95 - 110
Hauptverfasser: Sun, Weibin, Fan, Lulu, Han, Yunkun, Knudsen, Kirsten K., Chen, Guangwen, Zhang, Hong-Xin
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Philadelphia The American Astronomical Society 01.03.2024
IOP Publishing
Schlagworte:
Active galactic nuclei
Active galaxies
Black holes
Cold gas
Cosmic dust
Depletion
Dust
Galaxies
High-redshift galaxies
Infrared astronomy
Median (statistics)
Molecular gases
Physical properties
Quasars
Radio telescopes
Samples (statistical)
Spectral energy distribution
Star & galaxy formation
Star formation
Starburst galaxies
Stellar mass
ISSN:0004-637X, 1538-4357, 1538-4357
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Zusammenfassung:We present a UV to millimeter spectral energy distribution (SED) analysis of 16 hyperluminous, dust-obscured quasars at z ∼ 3, selected by the Wide-field Infrared Survey Explorer. We aim to investigate the physical properties of these quasars, with a focus on their molecular gas content. We decompose the SEDs into three components: stellar, cold dust, and active galactic nucleus (AGN). By doing so, we are able to derive and analyze the relevant properties of each component. We determine the molecular gas mass from CO line emission based on Atacama Large Millimeter/submillimeter Array (ALMA) observations. By including ALMA observations in the multiwavelength SED analysis, we derive the molecular gas fractions, gas depletion timescales, and star formation efficiencies (SFEs). Their sample median and 16th–84th quartile ranges are f gas ∼ 0.33 − 0.17 + 0.33 , t depl ∼ 39 − 28 + 85 Myr, and SFE ∼ 297 − 195 + 659 K km s −1 pc −2 , respectively. Compared to main-sequence galaxies, they have lower molecular gas content and higher SFEs, similar to quasars in the literature. This suggests that the gas in these quasars is rapidly depleted, likely as the result of intense starburst activity and AGN feedback. The observed correlations between these properties and the AGN luminosities further support this scenario. Additionally, we infer the black hole to stellar mass ratio and black hole mass growth rate, which indicate significant central black hole mass assembly over short timescales. Our results are consistent with the scenario that our sample represents a short transition phase toward unobscured quasars.
Bibliographie:Galaxies and Cosmology
AAS50306
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/1538-4357/ad22e3