"Zombie" or active? An alternative explanation to the properties of star-forming galaxies at high redshift

被引：4

作者：

Saturni, F. G. ^{[1
,2
]}

Mancini, M. ^{[3
]}

Pezzulli, E. ^{[1
,4
,5
]}

Tombesi, F. ^{[1
,6
,7
,8
]}

机构：

[1] INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy

[2] Agenzia Spaziale Italiana, Space Sci Data Ctr, Via Politecn Snc, I-00133 Rome, Italy

[3] ASTRON Netherlands Inst Radio Astron, Oude Hoogeveensedijk 4, NL-7991 Dwingeloo, Netherlands

[4] Univ Roma La Sapienza, Dipartimento Fis, Ple A Moro 5, I-00185 Rome, Italy

[5] INFN, Sez Roma 1, Ple A Moro 2, I-00185 Rome, Italy

[6] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy

[7] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[8] NASA, Goddard Space Flight Ctr, Code 662, Greenbelt, MD 20771 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 617卷

关键词：

galaxies: ISM; galaxies: photometry; infrared: galaxies; ultraviolet: galaxies; galaxies: active; quasars: general; DIGITAL SKY SURVEY; SPECTRAL ENERGY-DISTRIBUTION; SUPERMASSIVE BLACK-HOLES; COMPTON HEATED WINDS; WEBB-SPACE-TELESCOPE; 7TH DATA RELEASE; X-RAY; GALACTIC NUCLEI; LUMINOSITY FUNCTION; STARBURST GALAXIES;

D O I：

10.1051/0004-6361/201833261

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Star-forming galaxies at high redshift show anomalous values of infrared excess, which can be described only by extremizing the existing relations between the shape of their ultraviolet continuum emission and their infrared-to-ultraviolet luminosity ratio, or by constructing ad hoc models of star formation and dust distribution. Aims. We present an alternative explanation, based on unveiled AGN activity, of the existence of such galaxies. The scenario of a weak AGN lends itself naturally to explain the observed spectral properties of these high-z objects in terms of a continuum slope distribution and not altered infrared excesses. Methods. To this end, we directly compare the infrared-to-ultraviolet properties of high-redshift galaxies to those of known categories of AGN (quasars and Seyferts). We also infer the characteristics of their possible X-ray emission. Results. We find a strong similarity between the spectral shapes and luminosity ratios of AGN with the corresponding properties of such galaxies. In addition, we derive expected X-ray fluxes that are compatible with the energetics from AGN activity. Conclusions. We conclude that a moderate AGN contribution to the UV emission of such high-z objects is a valid alternative to explain their spectral properties. Even the presence of an active nucleus in each source would not violate the expected quasar statistics. Furthermore, we suggest that the observed similarities between anomalous star-forming galaxies and quasars may provide a benchmark for future theoretical and observational studies on the galaxy population in the early Universe.

引用

页数：13

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