NAOC Open IR
Searching for Kardashev Type III civilisations from high q-value sources in the LoTSS-DR1 value-added catalogue
Chen, H.1,2,3; Garrett, M. A.2,4
2021-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume507Issue:3Pages:3761-3770
AbstractKardashev Type III civilisations have by definition energy requirements that are likely to generate strong excess emission in the mid-infrared (MIR) that is associated with the waste heat they generate. For those civilisations that capture starlight via Dyson sphere like constructions, the Optical to MIR flux ratio of the host galaxies is also expected to be unusually low. Since a wide range of galaxy types adhere to the infrared-radio correlation (IRC), galaxies hosting Type III civilisations should also strongly deviate from this relation. Radio data can therefore play a crucial role in breaking the degeneracy between the effects of dust obscuration in a galaxy and the signature of an energy-intensive civilisation. We have used the newly released LoTSS-DR1 value-added catalogue to create a sample of 16 367 z < 0.2 sources with radio and MIR flux densities, optical photometry and (photometric) redshifts. We calculated the IRC parameter q(150) (22)(MHz) (mu m) = log(S-150 (MHz)/S-22 (mu m)) and identified 21 sources with exceptionally high values of q(150) (22)(MHz) (mu m), an indication of MIR emission enhanced by a factor of similar to 10. Out of the 21 high q-value sources, 4 sources have very red MIR colours, and appear to have relatively low optical/MIR ratios. Two of the four sources are not well known in the literature, they are considered as potential hosts of Type III civilisations. These sources deserve further study and investigation. Finally, we note that extending our analysis to the full LoTSS survey area can place very strong constraints on the incidence of Tune III civilisations in the Universe.
Keywordgalaxies: active galaxies: nuclei galaxies: star formation infrared: galaxies infrared: general radio continuum: galaxies
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1093/mnras/stab2207
WOS KeywordSTAR-FORMING GALAXIES ; INFRARED-RADIO CORRELATION ; SKY SURVEY ; EXTRATERRESTRIAL CIVILIZATIONS ; REDSHIFT DEPENDENCE ; LOFAR ; EMISSION ; FREQUENCY ; AGN ; I.
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000708848000044
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/74948
Collection中国科学院国家天文台
Corresponding AuthorChen, H.; Garrett, M. A.
Affiliation1.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100101, Peoples R China
2.Univ Manchester, Jodrell Bank Ctr Astrophys JBCA, Dept Phys & Astron, Alan Turing Bldg, Manchester M13 9PL, Lancs, England
3.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
4.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
Recommended Citation
GB/T 7714
Chen, H.,Garrett, M. A.. Searching for Kardashev Type III civilisations from high q-value sources in the LoTSS-DR1 value-added catalogue[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,507(3):3761-3770.
APA Chen, H.,&Garrett, M. A..(2021).Searching for Kardashev Type III civilisations from high q-value sources in the LoTSS-DR1 value-added catalogue.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,507(3),3761-3770.
MLA Chen, H.,et al."Searching for Kardashev Type III civilisations from high q-value sources in the LoTSS-DR1 value-added catalogue".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 507.3(2021):3761-3770.
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