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A KMOS survey of the nuclear disk of the Milky Way I: Survey design and metallicities by Fritz, Tobias K.; Patrick, Lee; Feldmeier-Krause, Anja; Schödel, Rainer; Schultheis, Mathias; Gerhard, Ortwin; Nandakumar, Govind; Neumayer, Nadine; Nogueras-Lara, Francisco; Prieto, M. Almudena is a scholarly article available to read on EtoBox.

What is A KMOS survey of the nuclear disk of the Milky Way I: Survey design and metallicities about?

In the central few degrees of the bulge of the Milky Way there is a flattened structure of gas, dust and stars (the central molecular zone) similar to nuclear disks in other galaxies. Due to extreme foreground extinction we possess only sparse information about the (mostly old) stellar population of the nuclear disc. Here we present our KMOS spectroscopic survey of the stars in the nuclear disk reaching the old populations. In order to obtain an unbiased data set, we sample stars in the full extinction range along each line-of-sight. We also observe reference fields in neighboring regions of the Galactic bulge. Here we describe the design and execution of the survey and present first results. We obtain spectra and five spectral indices of 3113 stars with a median S/N of 67 and measure radial velocities for 3051 stars. Of those, 2735 sources have sufficient S/N to estimate temperatures and metallicities from indices. We derive metallicities using the CO 2-0 and Na I K-band spectral features, where we derive our own empirical calibration using metallicities obtained with higher resolution observations. We use 183 giant stars for calibration spanning in metallicity from -2.5 to 0.6 de

Author

Fritz, Tobias K.; Patrick, Lee; Feldmeier-Krause, Anja; Schödel, Rainer; Schultheis, Mathias; Gerhard, Ortwin; Nandakumar, Govind; Neumayer, Nadine; Nogueras-Lara, Francisco; Prieto, M. Almudena

Published

2020

Language

EN