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X-ray spectral states and metallicity in the ultraluminous X-ray sources NGC 1313 X-1 and X-2
Fabio Pintore, Luca Zampieri
We present a systematic analysis of the X-ray spectra of NGC 1313 X-1 and NGC 1313 X-2, using three years of XMM-Newton observations. We fitted the continuum with a Comptonization…
On the cosmological evolution of the black hole - host galaxy relation in quasars
L. Portinari, J. Kotilainen, R. Falomo +1
Quasars are useful tracers of the cosmological evolution of the black hole mass - galaxy relation. We compare the expectations of Semi-Analytical Models (SAM) of galaxy evolution,…
The low-mass end of the Mbh/Mhost relation in quasars
Roberto Decarli, Renato Falomo, Jari K. Kotilainen +3
The Mbh-Mhost relation in quasars has been probed only in a limited parameter space, namely at Mbh~10^9 Msun and Mhost~10^12 Msun. Here we present a study of 26 quasars lying in th…
Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2
L. Zampieri, D. Impiombato, R. Falomo +2
We analyzed the longest phase-connected photometric dataset available for NGC 1313 X-2, looking for the ~6 day modulation reported by Liu et al. (2009). The folded B band light cur…
The host galaxy of the BL Lacertae object 1ES 0647+250 and its imaging redshift
J. K. Kotilainen, T. Hyvönen, R. Falomo +2
Since no spectroscopic redshift is available for the remarkable BL Lac object 1ES 0647+250, we aim to derive an estimate of its distance from the properties of its host galaxy.We o…
BL Lac objects with optical jets: PKS 2201+044, 3C 371 and PKS 0521-365
E. Liuzzo, R. Falomo, A. Treves
We investigate the properties of the three BL Lac objects, PKS 2201+044, 3C 371 and PKS 0521-365, that exhibit prominent optical jets. We present high resolution near-IR images of…