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SDSS-IV MaNGA: Calibration of astrophysical line-widths in the H{\alpha} region using HexPak observations by Chattopadhyay, Sabyasachi; Bershady, Matthew A.; Law, David R.; Westfall, Kyle; Shetty, Shravan; Machuca, Camilo; Cappellari, Michele; Rubin, Kate H. R.; Bundy, Kevin; Penny, Samantha is a scholarly article available to read on EtoBox.

What is SDSS-IV MaNGA: Calibration of astrophysical line-widths in the H{\alpha} region using HexPak observations about?

We have re-observed $\rm\sim$40 low-inclination, star-forming galaxies from the MaNGA survey ($\upsigma\sim65$~\kms) at $\sim$6.5 times higher spectral resolution ($\upsigma\sim10$~\kms) using the HexPak integral field unit on the WIYN 3.5m telescope. The aim of these observations is to calibrate MaNGA's instrumental resolution and to characterize turbulence in the warm interstellar medium and ionized galactic outflows. Here we report the results for the H$\rm\upalpha$ region observations as they pertain to the calibration of MaNGA's spectral resolution. Remarkably, we find that the previously-reported MaNGA line-spread-function (LSF) Gaussian width is systematically underestimated by only 1\%. The LSF increase modestly reduces the characteristic dispersion of HII regions-dominated spectra sampled at 1-2 kpc spatial scales from 23 to 20 km s$^{-1}$ in our sample, or a 25\% decrease in the random-motion kinetic energy. This commensurately lowers the dispersion zeropoint in the relation between line-width and star-formation rate surface-density in galaxies sampled on the same spatial scale. This modest zero-point shift does not appear to alter the power-law slope in the relation betw

Author

Chattopadhyay, Sabyasachi; Bershady, Matthew A.; Law, David R.; Westfall, Kyle; Shetty, Shravan; Machuca, Camilo; Cappellari, Michele; Rubin, Kate H. R.; Bundy, Kevin; Penny, Samantha

Published

2024

Language

EN