ABOUT LAMBDA

COBE

Cosmic Background Explorer/DMR

Product Name
Galactic Emission Sky Maps
Mission
COBE/DMR
Coord. System
Galactic or Ecliptic
Projection Type
COBE Quad Cube
Beam Size

Description

Due to the differential nature of the observations, the maps have unconstrained antenna temperature zero points. While the dipole anisotropy has been removed to first order (see note above), emission from the Galaxy remains.

The DMR Analyzed Science Data Sets include Galactic Emission Maps and Cosmic Emission Maps. The latter result when the Galactic emission is removed. The modeled Galactic components are synchrotron emission (dmr_synch.fits), free-free emission (dmr_free.fits), and thermal dust emission (dmr_dust.fits).

Two techniques were used to produce the Cosmic Emission Maps, a "subtraction technique" in which the Galactic components are subtracted from the DMR maps (dmr_dsmb.fits), and a "combination technique" in which a linear combination of the DMR maps is used to cancel the Galactic emission (dmr_dcmb.fits). Corresponding to each of these maps is an equivalent map pixelized in Galactic coordinates (e.g., dmr_dust_galactic.fits).

For a more detailed description of the Analyzed Science Data Sets and the corresponding Galactic Coordinate Data Sets, see the DMR Explanatory Supplement and references therein.

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A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason