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Title: The lick-index calibration of the Gemini multi-object spectrographs

Abstract

We present the calibration of the spectroscopic Lick/IDS standard line-index system for measurements obtained with the Gemini Multi-Object Spectrographs known as GMOS-North and GMOS-South. We provide linear correction functions for each of the 25 standard Lick line indices for the B600 grism and two instrumental setups, one with 0.''5 slit width and 1 × 1 CCD pixel binning (corresponding to ∼2.5 Å spectral resolution) and the other with 0.''75 slit width and 2 × 2 binning (∼4 Å). We find small and well-defined correction terms for the set of Balmer indices Hβ, Hγ {sub A}, and Hδ {sub A} along with the metallicity sensitive indices Fe5015, Fe5270, Fe5335, Fe5406, Mg{sub 2}, and Mgb that are widely used for stellar population diagnostics of distant stellar systems. We find other indices that sample molecular absorption bands, such as TiO{sub 1} and TiO{sub 2}, with very wide wavelength coverage or indices that sample very weak molecular and atomic absorption features, such as Mg{sub 1}, as well as indices with particularly narrow passband definitions, such as Fe4384, Ca4455, Fe4531, Ca4227, and Fe5782, which are less robustly calibrated. These indices should be used with caution.

Authors:
 [1]; ;  [2];  [3];  [4];  [5]
  1. Department of Astronomy and Astrophysics, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago (Chile)
  2. Gemini Observatory, Casilla 603, La Serena (Chile)
  3. Middlebury College, Middlebury, VT 05753 (United States)
  4. Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309 (United States)
  5. National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States)
Publication Date:
OSTI Identifier:
22340137
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 145; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; CALIBRATION; CHARGE-COUPLED DEVICES; CORRECTIONS; DATA ANALYSIS; METALLICITY; RESOLUTION; SPECTRA; SPECTROSCOPY; STARS; TITANIUM OXIDES; WAVELENGTHS

Citation Formats

Puzia, Thomas H., Miller, Bryan W., Trancho, Gelys, Basarab, Brett, Mirocha, Jordan T., and Butler, Karen, E-mail: tpuzia@astro.puc.cl, E-mail: bmiller@gemini.edu. The lick-index calibration of the Gemini multi-object spectrographs. United States: N. p., 2013. Web. doi:10.1088/0004-6256/145/6/164.
Puzia, Thomas H., Miller, Bryan W., Trancho, Gelys, Basarab, Brett, Mirocha, Jordan T., & Butler, Karen, E-mail: tpuzia@astro.puc.cl, E-mail: bmiller@gemini.edu. The lick-index calibration of the Gemini multi-object spectrographs. United States. doi:10.1088/0004-6256/145/6/164.
Puzia, Thomas H., Miller, Bryan W., Trancho, Gelys, Basarab, Brett, Mirocha, Jordan T., and Butler, Karen, E-mail: tpuzia@astro.puc.cl, E-mail: bmiller@gemini.edu. Sat . "The lick-index calibration of the Gemini multi-object spectrographs". United States. doi:10.1088/0004-6256/145/6/164.
@article{osti_22340137,
title = {The lick-index calibration of the Gemini multi-object spectrographs},
author = {Puzia, Thomas H. and Miller, Bryan W. and Trancho, Gelys and Basarab, Brett and Mirocha, Jordan T. and Butler, Karen, E-mail: tpuzia@astro.puc.cl, E-mail: bmiller@gemini.edu},
abstractNote = {We present the calibration of the spectroscopic Lick/IDS standard line-index system for measurements obtained with the Gemini Multi-Object Spectrographs known as GMOS-North and GMOS-South. We provide linear correction functions for each of the 25 standard Lick line indices for the B600 grism and two instrumental setups, one with 0.''5 slit width and 1 × 1 CCD pixel binning (corresponding to ∼2.5 Å spectral resolution) and the other with 0.''75 slit width and 2 × 2 binning (∼4 Å). We find small and well-defined correction terms for the set of Balmer indices Hβ, Hγ {sub A}, and Hδ {sub A} along with the metallicity sensitive indices Fe5015, Fe5270, Fe5335, Fe5406, Mg{sub 2}, and Mgb that are widely used for stellar population diagnostics of distant stellar systems. We find other indices that sample molecular absorption bands, such as TiO{sub 1} and TiO{sub 2}, with very wide wavelength coverage or indices that sample very weak molecular and atomic absorption features, such as Mg{sub 1}, as well as indices with particularly narrow passband definitions, such as Fe4384, Ca4455, Fe4531, Ca4227, and Fe5782, which are less robustly calibrated. These indices should be used with caution.},
doi = {10.1088/0004-6256/145/6/164},
journal = {Astronomical Journal (New York, N.Y. Online)},
number = 6,
volume = 145,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 2013},
month = {Sat Jun 01 00:00:00 EDT 2013}
}