PMAS: The Potsdam Multi-Aperture Spectrophotometer. II. The Wide Integral Field Unit PPak

PPak is a new fiber-based integral field unit (IFU) developed at the Astrophysical Institute of Potsdam and implemented as a module into the existing Potsdam Multi-Aperture Spectrophotometer (PMAS) spectrograph. The purpose of PPak is to provide an extended field of view with a large light-collecting power for each spatial element, as well as an adequate spectral resolution. The PPak system consists of a fiber bundle with 331 object fibers, 36 sky fibers, and 15 calibration fibers. The object and sky fibers collect the light from the focal plane behind a focal reducer lens. The object fibers of PPak, each 2.7" in diameter, provide a contiguous hexagonal field of view of 74" × 64" on the sky, with a filling factor of 60%. The operational wavelength range is from 400 to 900 nm. The PPak IFU, together with the PMAS spectrograph, are intended for the study of extended, low surface brightness objects, offering an optimization of total light-collecting power and spectral resolution. This paper describes the instrument design, the assembly, integration, and tests, the commissioning and operational procedures, and presents the measured performance at the telescope.

[1]  Andreas Kelz,et al.  Commissioning of the PMAS 3D-spectrograph , 2003, SPIE Astronomical Telescopes + Instrumentation.

[2]  M. Bershady,et al.  SparsePak: A Formatted Fiber Field Unit for the WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration , 2004, astro-ph/0403456.

[3]  Andreas Kelz,et al.  PMAS telescope module: optomechanical design and manufacture , 2003, SPIE Astronomical Telescopes + Instrumentation.

[4]  Andreas Kelz,et al.  Development of the wide-field IFU PPak , 2004, SPIE Astronomical Telescopes + Instrumentation.

[5]  Ian R. Parry,et al.  Deep fiber spectroscopy , 1990, Astronomical Telescopes and Instrumentation.

[6]  H Germany,et al.  PMAS: The Potsdam Multi‐Aperture Spectrophotometer. I. Design, Manufacture, and Performance , 2005, astro-ph/0502581.

[7]  Andreas Kelz,et al.  PMAS fiber module: design, manufacture, and performance optimization , 2003, SPIE Astronomical Telescopes + Instrumentation.

[8]  Oliver LeFevre,et al.  Commissioning and performances of the VLT-VIMOS , 2003, SPIE Astronomical Telescopes + Instrumentation.

[9]  ANAMORPHIC MAGNIFICATION OF GRATING SPECTROGRAPHS - A REMINDER , 1979 .

[10]  E3D, the Euro3D visualization tool I: Description of the program and its capabilities , 2004 .

[11]  The Disk Mass project; science case for a new PMAS IFU module , 2003, astro-ph/0311555.

[12]  J. Schmoll,et al.  Statistical Test of Optical Fibers for Use in PMAS, the Potsdam Multi‐Aperture Spectrophotometer , 2003, astro-ph/0304288.

[13]  Matthew A. Bershady,et al.  SparsePak: A Formatted Fiber Field Unit for The WIYN Telescope Bench Spectrograph. II. On-Sky Performance , 2005 .

[14]  Steve B. Howell,et al.  TWO-DIMENSIONAL APERTURE PHOTOMETRY: SIGNAL-TO-NOISE RATIO OF POINT-SOURCE OBSERVATIONS AND OPTIMAL DATA-EXTRACTION TECHNIQUES , 1989 .

[15]  Andreas Kelz,et al.  Faint object 3D spectroscopy with PMAS , 2004, SPIE Astronomical Telescopes + Instrumentation.

[16]  J. B. Oke.  Faint Spectrophotometric Standard Stars , 1990 .

[17]  A. Kelz,et al.  E3D, the Euro3D visualization tool II: Mosaics, VIMOS data and large IFUs of the future , 2004 .