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Radiation Effects on Stressed Ge:Ga Array Detector of Far-Infrared Surveyor on AKARI

Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +6 more

AKARI, the Japanese infrared astronomical satellite, was launched on 2006 February 21 (UT) and put into a sun-synchronous polar orbit at an altitude of 700 km. Cosmic radiations, particularly protons in the South Atlantic Anomaly (SAA), were expected to affect the performance of the stressed Ge:Ga array far-infrared detector on board AKARI. One of…

Far-Ultraviolet Spectral Analysis of the Prototype Nova-like Variable VY Sculptoris from the High State to the Low State

Sion, Edward M.; Hamilton, Ryan T.

The prototype nova-like variable VY Sculptoris was observed by the IUE during four different optical brightness states of the system. The far-ultraviolet (FUV) flux level from the highest state to the lowest state declines by a factor of 28. We have carried out model accretion disk and white dwarf atmosphere fitting to the spectra. The correspondi…

Late-Time HST Photometry of SN 1994I: Hints of Positron Annihilation Energy Deposition

Filippenko, Alexei V.; Garnavich, Peter; Fransson, Claes +12 more

We present multicolor Hubble Space Telescope (HST) WFPC2 broadband observations of the Type Ic SN 1994I obtained ∼280 d after maximum light. We measure the brightness of the SN and, relying on the detailed spectroscopic database of SN 1994I, we transform the ground-based photometry obtained at early times to the HST photometric system, deriving li…

A Cosmologically Motivated Description of the Dark Matter Halo Profile for the Low Surface Brightness Galaxy, Malin 1

Seigar, Marc S.

In this paper we derive a possible mass profile for the low surface brightness galaxy, Malin 1, based upon previously published space-based and ground-based photometric properties and kinematics. We use properties of the bulge, normal disk, outer extended disk, and H i mass as inputs into mass profile models. We find that the dark matter halo mode…

Study of Long-lived Radioactive Sources in the Galaxy with INTEGRAL/SPI

Wang, Wei