2018A&A...617A.131S


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.08CEST14:10:35

2018A&A...617A.131S - Astronomy and Astrophysics, volume 617A, 131-131 (2018/9-1)

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

SATURNI F.G., MANCINI M., PEZZULLI E. and TOMBESI F.

Abstract (from CDS):


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.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: ISM - galaxies: photometry - infrared: galaxies - ultraviolet: galaxies - galaxies: active - quasars: general

Status at CDS:  

CDS comments: Table 1: HZ6a, HZ6b, HZ6c and HZ10W are not in SIMBAD.

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9299 1
2 SDSS J095728.55+022037.8 ? 09 57 28.55016 +02 20 37.8564           ~ 1 0
3 [UHD2015] 218 EmG 09 58 28.52 +02 03 06.8 27.59 28.369 27.394 26.16 24.65 ~ 21 0
4 UVISTADR1 J095930.47+020802.6 G 09 59 30.47 +02 08 02.7 27.88 27.17   26.64 25.04 ~ 13 0
5 [CCJ2015b] HZ9 G 09 59 51.697 +02 22 42.16           ~ 17 0
6 [IML2013] 149.97186+02.11819 EmG 09 59 53.250 +02 07 05.60     27.16 27.87 25.65 ~ 17 0
7 [CCJ2015b] HZ8W G 10 00 03.971 +02 37 36.23           ~ 7 0
8 UVISTADR1 J100004.06+023735.7 G 10 00 04.05 +02 37 35.9     27.494 26.12 24.35 ~ 16 0
9 [CCJ2015b] HZ3 G 10 00 09.431 +02 20 13.86           ~ 12 0
10 [CRS2011] 1447524 G 10 00 21.504 +02 35 11.08           ~ 22 0
11 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 1997 0
12 [CCJ2015b] HZ5a G 10 00 51.520 +02 34 59.29           ~ 4 0
13 COSMOS 2327104 QSO 10 00 51.59 +02 34 57.6           ~ 18 0
14 [MTS2007] 66 EmG 10 00 59.300 +01 33 19.60           ~ 22 0
15 SDSS J100100.04+021300.6 ? 10 01 00.04728 +02 13 00.7068           ~ 1 0
16 [CCJ2015b] HZ2 G 10 02 04.098 +01 55 44.05           ~ 13 0

    Equat.    Gal    SGal    Ecl

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2020.04.08-14:10:35

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