On the spectro-photometric properties of the bulk of Radio-Loud AGN population Ranieri D. Baldi 1, Alessandro Capetti 2 1: SISSA, Trieste 2: Osservatorio Astronomico di Torino Baldi & Capetti 2009, 2010

The fundamental question is: Do the classical powerful radio sources, FRI and FRII, provide us with the correct view of AGN in radio galaxies? Method: spectro-photometric analysis of a sample of samples of low-luminous radio sources Baldi Ranieri D. Ferrara, 25/05/2010

The Core Galaxies are miniature radio-galaxies (FR I). (Balmaverde & Capetti 06 and Balmaverde,Baldi & Capetti 08). CoreG 3CR/FRI Baldi Ranieri D. Ferrara, 25/05/2010

The properties of the radio emission are similar to those of 3C/FRI. UGC 8745 = 0.7 ~20kpc Baldi Ranieri D. Ferrara, 25/05/2010

The CoreG show a Core Dominance of a factor 100 larger than the classical 3C/FRI. CoreG 3CR Baldi Ranieri D. Ferrara, 25/05/2010

The Core Galaxies are Low Excitation Galaxies (LEG) like 3C/FRI. 3CR/LEG Kewley et al. (2006) Baldi Ranieri D. Ferrara, 25/05/2010

The nuclear properties of CoreG are similar to those of FRI. CoreG show a genuine extended radio emission deficit of a factor 100. (erg s -1 ) Baldi Ranieri D. Ferrara, 25/05/2010

Deficit in radio extended emission?? But, their radio core is fainter than that typical of FRI/LEG. Let us look for other core dominated sources in sample of higher power. Baldi Ranieri D. Ferrara, 25/05/2010

High core dominated sources with higher radio core power! From Giovannini et al. (1988) B2 sample, 11 objects with core dominance > 0.1 B2 CoreG 3CR/FRI B2 (erg s -1 ) Baldi Ranieri D. Ferrara, 25/05/2010

Our interpretation: The prevalence of low core dominance sources in low frequency flux limited samples is due to a selection bias. To test this scenario.. Best et al (2005) of RL AGN: crossmatching the galaxies drawn from the SDSS DR2 with the NVSS and FIRST radio surveys. Selection: > 5 mJy Baldi Ranieri D. Ferrara, 25/05/2010

The bulk of the population of this SDSS/NVSS AGN sample shows a large deficit of total radio emission, similar to that observed in CoreG. 3CR correlation Seyfert > 5 mJy At z=0.1 L r = erg s -1 CoreG 0.03 < z < 0.1 (erg s -1 ) Baldi Ranieri D. Ferrara, 25/05/2010 LEG

The bulk of the population of this SDSS/NVSS AGN sample shows a large deficit of total radio emission, similar to that observed in CoreG. > 5 mJy At z=0.1 L r = erg s -1 3CR correlation Baldi Ranieri D. Ferrara, 25/05/2010

If we use the B2 sample flux selection criterion, low core dominance radio galaxies are the dominant population. 3CR correlation Baldi Ranieri D. Ferrara, 25/05/2010

Are there differences between SDSS/NVSS sources and 3CR/LEG? 1.Spectral classification 2.Host mass, morphology and colors 3.Black hole mass distribution Baldi Ranieri D. Ferrara, 25/05/2010

SFG LEG HEG Baldi Ranieri D. Ferrara, 25/05/2010 Kewley et al. (2006)

Most of the radio-loud AGN of the SDSS/NVSS sample are LEG and UG: they reach the L [OIII] - L ext relation of the 3CR/LEG. z < 0.1 Baldi Ranieri D. Ferrara, 25/05/2010

UnclassifedGalaxies (UG) are consistent with being low-luminous LEG Baldi Ranieri D. Ferrara, 25/05/2010

The host galaxies associated with the SDSS/NVSS sample are mostly red early-type galaxies (ETG) with no active star formation. Baldi Ranieri D. Ferrara, 25/05/2010

The host galaxies associated with the SDSS/NVSS sample are mostly massive ETG with large black hole masses. The most of the SDSS/NVSS shows host properties statistically indistinguishable from those of the 3CR/LEG hosts

All morphological classes are represented, but 80% do not show extended radio structures. Baldi Ranieri D. Ferrara, 25/05/2010 “FIRST” radio images: FWHM = 5 arcsec FR0

The higher fraction of UG with extended radio structures can be du to an evolution of part of the LEG population, from small radio sources of high L([OIII]), to larger size and smaller L([OIII]). Baldi Ranieri D. Ferrara, 25/05/2010 Extended radio structures: LEG 5% UG 27% LEG Line emission UG Line emission

Baldi Ranieri D. Ferrara, 25/03/2010 There is no a clear discontinuity in either the host or nuclear properties as they span from radio-quiet and radio- loud AGN. After a detailed analysis on a object by object, we concluded that no bona fide radio-loud AGN with LEG spectra could be found in a late-type galaxies or with log M BH < 10 8 M sun < z < 0.3 HEG: LEG:

1.Selection bias in radio flux-limited sample causes the inclusion only of radio- galaxies with well developped extended structures. The bulk of RL AGN population is virtually unexplored -> SDSS/NVSS sample. 2.the SDSS/NVSS AGN sample is mostly composed of quiescent red, massive (10.5 < log M gal < 12 M sun ) ETG with large black hole masses (7.7 < log M BH < 9 M sun ), statistically indistinguishable from hosts of low-redshift 3CR/LEG 3.No genuine radio-loud LEG in late-type galaxies and M BH < 10 8 M sun 4. A minority (10%) of the sample are in spiral galaxies, with small black hole masses or with HEG spectra (contamination from Seyfert and SF galaxies) 5.For HEG no separation from radio-quiet/radio-loud AGN in host properties. Possible interpretations for low extended power: 1. Link between age and radio extended emission. Young, recurrent? 2.Influence of environment on the jets properties. Baldi Ranieri D. Ferrara, 25/05/2010