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Pradhan, Ananta C

Publications and source records attributed to Pradhan, Ananta C.

OBSERVATIONS OF FAR-ULTRAVIOLET DIFFUSE EMISSION FROM THE SMALL MAGELLANIC CLOUD

We report the first observations of far-ultraviolet (FUV: 1000-1150 A) diffuse radiation from the Small Magellanic Cloud (SMC) using observations from the Far-Ultraviolet Spectroscopic Explorer. The strength of FUV diffuse surface brightness in the SMC ranges from the detection limit of 2000 photons cm{sup -2} s{sup -1} sr{sup -1} A{sup -1} to a maximum of 3 Multiplication-Sign 10{sup 5} photons cm{sup -2} s{sup -1} sr{sup -1} A{sup -1} at 1004 A. The contribution of diffuse emission to the total radiation field was found to be 34% at 1004 A to 44% at 1117 A with a maximum observed uncertainty of 30%. There is a striking difference between the FUV diffuse fraction from the SMC and the Large Magellanic Cloud with the SMC fraction being higher probably because of the higher dust albedo. The FUV diffuse emission correlates with H{alpha} emission in the H II regions of the SMC.

79 ASTRONOMY AND ASTROPHYSICS↗

FAR-ULTRAVIOLET DIFFUSE EMISSION FROM THE LARGE MAGELLANIC CLOUD

We present the first observations of diffuse radiation in the far-ultraviolet (FUV; 1000-1150 A) from the Large Magellanic Cloud based on observations made with the Far Ultraviolet Spectroscopic Explorer. The fraction of the total radiation in the field emitted as diffuse radiation is typically 5%-20% with a high of 45% near N70 where there are few exciting stars, indicating that much of the emission is not due to nearby stars. Much less light is scattered in the FUV than at longer wavelengths, with the stellar radiation going into heating the interstellar dust.

79 ASTRONOMY AND ASTROPHYSICS↗