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Light scrambling and focal ratio degradation of thin multimode fibers with different core geometries
Man-Yin Leo Lee, Zhiheng Lin, Chit-Ho Hui +6
The performance of fiber-fed astronomical spectrographs is highly influenced by the properties of fibers. The near-field and far-field scrambling characteristics have a profound im…
Early Commissioning Results of Slit Mask Integral Field Units on the Southern African Large Telescope
Sabyasachi Chattopadhyaya, Matthew A. Bershady
Three fibre feed integral field units (IFUs), called Slit Mask IFUs (SMI), are being developed in the SAAO fibre-lab for the Robert Stobie Spectrograph (RSS). The smaller, 200 micr…
FiberPol-6D: Spectropolarimetric Integral Field mode for the SAAO 1.9 m Telescope using fibers
Siddharth Maharana, Sabyasachi Chattopadhyay, Matthew Bershady
Most optical spectropolarimeters built to date operate as long-slit or point-source instruments; they are inefficient for observations of extended objects such as galaxies and nebu…
SDSS-IV MaNGA: Calibration of astrophysical line-widths in the Hα region using HexPak observations
Sabyasachi Chattopadhyay, Matthew A. Bershady, David R. Law +7
We have re-observed 40 low-inclination, star-forming galaxies from the MaNGA survey ($\upsigma\sim65$~\kms) at 6.5 times higher spectral resolution ($\upsigma\sim10$…