[logo] 12' Maps of the Soft X-ray Diffuse Background from the ROSAT XRT/PSPC All-Sky Survey


.. MPE .. XRAY group .. ROSAT .. PSPC All-Sky Survey .. SXRB: initial maps .. 12' maps .. Bright source catalog ..

NH data

Maps of the column density of neutral hydrogen (NH) have been made available in the same projections as the X-ray data. They were created using 21-cm data from the Leiden/Dwingeloo survey, "Atlas of Galactic Neutral Hydrogen" published by D. Hartmann & W.B. Burton 1997, Cambridge University Press. The data were recast from the original Galactic latitude-velocity brightness temperature arrays into column density maps. Permission to distribute the Leiden/Dwingeloo data in this format was granted by the Authors and by Cambridge University Press. When using these data credit should be given to the above reference. The maps come as sets of velocity cuts in 50 km/s intervals centered on -100, -50, 0, 50, and 100 km/s. In addition, maps covering the ranges -459 to -125 km/s, 125 to 415 km/s, and -459 to 415 km/s are included. The projection used is the Zenith Equal Area in Galactic coordinates. The projection centers are at l,b = 0,90 0,-90 0,0 90,0 180,0 and 270,0. The image sizes are 512 x 512 pixels with 0.2 deg x 0.2 deg pixels, providing individual coverage of about 100 deg x 100 deg (with distortion increasing toward the edges). The map names contain the map details in the form: glllsbbnhSvvv.fits where g -> galactic coordinates lll -> three-digit Galactic longitude of the map center s -> sign, either "p" or "m", for the Galactic latitude bb -> two-digit absolute value of the map center Galactic latitude nh -> the maps are of column density S -> sign, either "p" or "m", for the velocity-cut center vvv -> three-digit absolute value for the velocity m150 => -459 to -125 km/s m100 => -125 to -75 km/s m050 => -75 to -25 km/s p000 => -25 to 25 km/s p050 => 25 to 75 km/s p100 => 75 to 125 km/s p150 => 125 to 415 km/s tot => -459 to 415 km/s

Leiden/Dwingeloo 21 cm maps


IRAS data

Maps of the IRAS 100 um intensity have been made available in the same projections as the X-ray data. They were created D.J. Schlegel, D.P. Finkbeiner and M. Davis from the IRAS ISSA maps. The maps were destriped to remove artifacts of the IRAS scan pattern, and have had point sources removed. The zodiacal light was removed by use of the 2.5 micron template. The offsets and scale factors were adjusted to match the DIRBE 100 micron maps. The DIRBE 100/240 micron color ratio was then used to correct the 100 micron image to the emission that would be seen if all dust were at a reference temperature of 18.2K. This map should be proportional to the total dust column. These maps were originally published in Schlegel, Finkbeiner, and Davis 1998, ApJ, 500, 525. Permission to distribute the data in this format was granted by the authors. The map names contain the map details in the form: glllsbb_d100.fits where g -> galactic coordinates lll -> three-digit Galactic longitude of the map center s -> sign, either "p" or "m", for the Galactic latitude bb -> two-digit absolute value of the map center Galactic latitude

IRAS 100 micron maps


Maintained by Michael Freyberg / 05-Jun-1996
Last change: 2-Sep-1999