1.1k citations · 18.6k across the 293 of their papers we have counts for
9 papers · 1 filter
On the cool gaseous haloes of quasars
E. P. Farina, R. Falomo, R. Decarli +2
We present optical spectroscopy of projected QSO pairs to investigate the MgII and the CIV absorption features imprinted on the spectrum of the background object by the gaseous hal…
HST narrow-band search for extended Ly-alpha emission around two z>6 quasars
Roberto Decarli, Fabian Walter, Yujin Yang +8
We search for extended Ly-alpha emission around two z>6 quasars, SDSS J1030+0524 (z=6.309) and SDSS J1148+5251 (z=6.419) using WFC3 narrow-band filters on board the Hubble Space Te…
Search of sub-parsec massive binary black holes through line diagnosis II
C. Montuori, M. Dotti, F. Haardt +2
Massive black hole binaries at sub-parsec separations may display in their spectra anomalously small flux ratios between the MgII and CIV broad emission lines, i.e. F_MgII/F_CIV <~…
The Intense Starburst HDF850.1 in a Galaxy Overdensity at z=5.2 in the Hubble Deep Field
Fabian Walter, R. Decarli, C. Carilli +24
The Hubble Deep Field (HDF) is a region in the sky that provides one of the deepest multi-wavelength views of the distant universe and has led to the detection of thousands of gala…
On the redshift of the bright BL Lac object PKS 0048-097
Marco Landoni, Renato Falomo, Aldo Treves +4
Aims: The determination of elusive redshifts of bright BL Lac objects Methods: We use the capabilities of newly available spectrograph X-Shooter at European Southern Observatory (E…
The optical spectrum of PKS 1222+216 and its black hole mass
E. P. Farina, R. Decarli, R. Falomo +2
We investigate the optical spectral properties of the blazar PKS 1222+216 during a period of 3 years. While the continuum is highly variable the broad line emission is practically…