We present timing and spectral analysis of a sample of seven hard X-ray selected Cataclysmic Variable candidates based on simultaneous X-ray and optical observations collected with XMM-Newton , complemented with Swift /BAT and INTEGRAL /IBIS hard X-ray data and ground-based optical photometry .
For six sources , X-ray pulsations are detected for the first time in the range \sim 296 - 6098 s , identifying them as members of the magnetic class .
Swift J0927.7-6945 , Swift J0958.0-4208 , Swift J1701.3-4304 , Swift J2113.5+5422 , and possibly PBC J0801.2-4625 , are Intermediate Polars ( IPs ) , while Swift J0706.8+0325 is a short ( 1.7 h ) orbital period Polar , the 11 ^ { th } hard X-ray selected identified so far .
X-ray orbital modulation is also observed in Swift J0927.7-6945 ( 5.2 h ) and Swift J2113.5+5422 ( 4.1 h ) .
Swift J1701.3-4304 is discovered as the longest orbital period ( 12.8 h ) deep eclipsing IP .
The spectra of the magnetic systems reveal optically thin multi-temperature emission between 0.2 and 60 keV .
Energy dependent spin pulses and the orbital modulation in Swift J0927.7-6945 and Swift J2113.5+5422 are due to intervening local high density absorbing material ( N _ { H } \sim 10 ^ { 22 - 23 } cm ^ { -2 } ) .
In Swift J0958.0-4208 and Swift J1701.3-4304 , a soft X-ray blackbody ( kT \sim 50 and \sim 80 eV ) is detected , adding them to the growing group of `` soft '' IPs .
White dwarf masses are determined in the range \sim 0.58 - 1.18 M _ { \odot } , indicating massive accreting primaries in five of them .
Most sources accrete at rates lower than the expected secular value for their orbital period .
Formerly proposed as a long-period ( 9.4 h ) novalike CV , Swift J0746.3-1608 shows peculiar spectrum and light curves suggesting either an atypical low-luminosity CV or a low mass X-ray binary .