Where the active galaxies live: a panchromatic view of radio-AGN in the AKARI-NEP field

0.09 MB·English

by  Marios Karouzos

The intriguinglife of massive galaxies
Proceedings IAU Symposium No. 295, 2013 (cid:13)c 2013International AstronomicalUnion
D. Thomas, A. Pasquali & I. Ferreras, eds. DOI:00.0000/X000000000000000X
Where the active galaxies live:
a panchromatic view of radio-AGN in the
AKARI-NEP field
Marios Karouzos1, Myungshin Im1, Markos Trichas2,
and the AKARI-NEP team
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CEOU-Seoul National University,1 Gwanak-ro, Gwanak-gu, Seoul 151-742, South Korea
3 email: [email protected]
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1 Harvard-Smithsonian Centerfor Astrophysics, 60 Garden Street,Cambridge, MA 02138
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Abstract. We study the host galaxy properties of radio sources in the AKARI-NorthEcliptic

n Pole (NEP) field, using an ensemble of multi-wavelength datasets. We identify both radio-loud
a and radio-quiet AGN and study their host galaxy properties by means of SED fitting. We
J investigate the relative importance of nuclear and star-formation activity in radio-AGN and

5 assess therole of radio-AGN as efficient quenchersof star-formation in their host galaxies.
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Keywords. galaxies: active, galaxies: evolution, galaxies: starburst

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1. The Project and Results
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h We construct broad-band SEDs (UV to 24µm; Fig. 1) for 48 radio sources at 1.5GHz
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with optical spectra in the AKARI-NEP field ([1]). Following [2], we fit an AGN and a
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o starburst component additively to each SED. The fractional contribution and luminosi-
r ties of both components are derived.
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s
a
We see a trend for decreasing contribution of active nuclei with increasing radio lu-
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minosity (3σ difference between lowest and highest luminosity bins; Fig. 1). The most

1 radio-loudsystems showhints forlowerstar-formationactivity thanotherwiseexpected.
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References
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3 [1] LeeH.M., Kim S.J., Im M., et al.2009, PASJ, 61, 375
. [2]RuizA.,MiniuttiG.,PanessaF.,&CarreraF.J. 2010, Astronomy & Astrophysics, 515,99
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1 100
:
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X %]
r on [ 60
a acti 40
Fr
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1e+28 1e+30 1e+32
L [erg/s/Hz]
1.5GHz
Figure 1. ExampleSED (left). Fractional contribution of AGN (red) and starburst (blue)
componentsversusradioluminosity(right),forindividual(symbols)andaveragevalues(lines).
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