DFS J1

Brand: Dfs

DFS J1, also known as G1.2+0.1, is a supernova remnant (SNR) located in the constellation Cassiopeia. It was first identified in 1965 by the National Radio Astronomy Observatory (NRAO) as a bright source in the 21-centimeter line of hydrogen. Since then, multiple observations have been made in other wavelengths, revealing significant structural and spectral features.Some key characteristics of DFS J1:1. Size and structure: The remnant covers an area of approximately 25 arcminutes (0.19 square degrees) in the sky, making it one of the most extended SNRs in the Milky Way. It has a complex morphology, with multiple shells, filaments, and arc-like structures superimposed upon each other.2. Age and distance: The age of DFS J1 is estimated to be around 30,000 years, based on detailed modeling and the presence of young pulsars. Its distance from Earth is not known precisely, but using various trigonometric and astrometric techniques, it is generally believed to lie between 3 and 11 kiloparsecs (10,000 and 36,000 light-years).3. Chemical abundances: The ionized gas in DFS J1 has been found to contain relatively high metallicities (i.e., abundances of elements heavier than helium) when compared to the interstellar medium as a whole. This suggests that the progenitor star of the SNR was likely a massive object with initial masses of around 15-25 times that of the Sun.4. Interaction with the interstellar medium: The interaction of DFS J1 with the local interstellar medium (ISM) has led to a variety of phenomena, including shock fronts, hotspots, and extended filaments. These structures provide valuable insights into the physical properties of the ISM, as well as the shock physics of SNRs.5. X-ray and radio spectral properties: As a result of its high energy and complex morphology, DFS J1 is a prime target for multiwavelength studies. It has been observed at X-ray energies, where it exhibits a remarkably complex spectral distribution, as well as at radio frequencies, where it has been used as a calibrator source for interferometric arrays.Given its numerous and intricate properties, DFS J1 continues to be an active area of research, providing insight into the mechanisms of stellar evolution, supernova explosions, and interstellar medium dynamics.

• Type: 2 way, 2 driver loudspeaker system
• Frequency Response: 55Hz to 18kHz
• Sensitivity:
• Crossover frequency: 2000Hz
• Impedance: 8Ω
• Power handling:
• Recommended Amplifier: 15 to 40W
• Dimensions: 20-3/8 x 12-3/4 x 10-5/8"
• Weight: 35 lb
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