104 citations · 115 across the 3 of their papers we have counts for
4 papers
An unbiased measurement of the UV background and its evolution via the proximity effect in quasar spectra
Aldo Dall'Aglio, Lutz Wisotzki, Gabor Worseck
We used 40 high resolution, high S/N QSO spectra at 2.1<z<4.7 to search for the signature of the proximity effect in the HI Lyalpha forest. Comparing the effective optical depth ne…
A slitless spectroscopic survey for quasars near quasars
G. Worseck, L. Wisotzki, F. Selman
We present the results of the Quasars near Quasars (QNQ) survey, a CCD-based slitless spectroscopic survey for faint V<22 quasars at 1.7<z<3.6 on 18 26.2'x33.5' fields centred on b…
The Transverse Proximity Effect in Spectral Hardness
G. Worseck, L. Wisotzki
We report on our recent detection of the transverse proximity effect of 4 foreground quasars near Q0302-003 (z=3.285) as a local hardness fluctuation in the spectral shape of the i…
Quasars near the line of sight towards Q 0302-003 and the transverse proximity effect
G. Worseck, L. Wisotzki
We report the discovery of the faint (V=21.7) quasar QSO03027-0010 at z=2.808 in the vicinity of Q0302-003, one of the few quasars observed with STIS to study intergalactic HeII ab…