Hectospec, the MMT’s 300 Optical Fiber‐Fed Spectrograph

The Hectospec is a 300 optical fiber fed spectrograph commissioned at the MMT in the spring of 2004. In the configuration pioneered by the Autofib instrument at the Anglo‐Australian Telescope, Hectospec’s fiber probes are arranged in a radial “fisherman on the pond” geometry and held in position wit...

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Published in:Publications of the Astronomical Society of the Pacific 2005-12, Vol.117 (838), p.1411-1434
Main Authors: Fabricant, Daniel, Fata, Robert, Roll, John, Hertz, Edward, Caldwell, Nelson, Gauron, Thomas, Geary, John, McLeod, Brian, Szentgyorgyi, Andrew, Zajac, Joseph, Kurtz, Michael, Barberis, Jack, Bergner, Henry, Brown, Warren, Conroy, Maureen, Eng, Roger, Geller, Margaret, Goddard, Richard, Honsa, Michael, Mueller, Mark, Mink, Douglas, Ordway, Mark, Tokarz, Susan, Woods, Deborah, Wyatt, William, Epps, Harland, Dell’Antonio, Ian
Format: Article
Language:English
Subjects:
Astronomical objects
Astronomy
Calibration
Earth, ocean, space
Exact sciences and technology
Galaxies
Optical fibers
Pixels
Red shift
Servomotors
Shutters
Space probes
Telescopes
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Summary:The Hectospec is a 300 optical fiber fed spectrograph commissioned at the MMT in the spring of 2004. In the configuration pioneered by the Autofib instrument at the Anglo‐Australian Telescope, Hectospec’s fiber probes are arranged in a radial “fisherman on the pond” geometry and held in position with small magnets. A pair of high‐speed, six‐axis robots move the 300 fiber buttons between observing configurations within ∼300 s, and to an accuracy of ∼25 μm. The optical fibers run for 26 m between the MMT’s focal surface and the bench spectrograph, operating at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $R\sim 1000{\mbox{--}} 2000$ \end{document} . Hectochelle, another high‐dispersion bench spectrograph offering \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $R\sim 35,000$ \end{document} , is also available. The system throughput, including all losses in the telescope optics, fibers, and spectrograph, peaks at ∼10% at the grating blaze in 1 \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\arcsec$\end{document} FWHM seeing. Co
ISSN:0004-6280
1538-3873
DOI:10.1086/497385