The dipping X-ray source 4U 1822 - 37 was observed by Suzaku on 2006 Octrober 20 for a net exposure of 37 ks .
The source was detected with the XIS at a 1-10 keV flux of 5.5 \times 10 ^ { -10 } erg cm ^ { -2 } s ^ { -1 } , and with the HXD ( HXD-PIN ) at a 10-50 keV flux of 8.9 \times 10 ^ { -10 } erg cm ^ { -2 } s ^ { -1 } .
With HXD-PIN , the pulsation was detected at a barycentric period of 0.592437 s , and its change rate was reconfirmed as -2.43 \times 10 ^ { -12 } s s ^ { -1 } .
The 1-50 keV spectra of 4U 1822-37 were found to be very similar to those of Her X-1 in the slopes , cutoff and iron lines .
Three iron lines ( Fe K \alpha , Fe XXV , and Fe XXVI ) were detected , on top of a 1-50 keV continuum that is described by an NPEX model plus a soft blackbody .
In addition , a cyclotron resonance scattering feature was detected significantly ( > 99 % confidence ) , at an energy of 33 \pm 2 keV with a depth of 0.4 ^ { +0.6 } _ { -0.3 } .
Therefore , the neutron star in this source is concluded to have a strong magnetic field of 2.8 \times 10 ^ { 12 } G. Further assuming that the source has a relatively high intrinsic luminosity of several times 10 ^ { 37 } erg s ^ { -1 } , its spectral and timing properties are consistently explained .