2014A&A...565A..19R

We present new results of CO(1-0) spectroscopic observations of four Sloan Digital Sky Survey (SDSS) type 2 quasars (QSO2) at z∼0.3, observed with the 30-m IRAM radio telescope. The QSO2 have infrared luminosities in the ultra-luminous infrared galaxies (ULIRG) regime. We confirm the CO(1-0) detection in one of our four QSO2, SDSS J1543-00, with L'_CO and M_H2 (1.2±0.2)x10¹⁰K*km/s*pc² and (9.4±1.4)x10⁹M_☉, respectively. The full width at half maximum (FWHM) of the CO(1-0) line is =575±102 km/s. No CO(1-0) emission is detected in SDSS J0903+02, SDSS J1337-01, SDSS J1520-01 above 3 sigma, yielding upper limits on M(H₂)∼9.6, 4.3 and 5.1x10⁹M_☉, respectively. We expand previous studies of the molecular gas content of intermediate z QSO2 into the ULIRG regime. Taking into account nine QSO2 at z∼0.3-1.0 from the literature, we discuss the location of the 13 ULIRG QSO2 at z<1 with available L'_CO measurements in the L'_CO vs. z and L'_CO vs. L_FIR diagrams, in comparison with other QSO1 and ULIRG star forming samples.