OSIRIS is an integral field spectrograph designed to work with the Keck Adaptive Optics System. It uses an array of tiny lenses to sample a rectangular patch of the focal plane and produces spectra at up to 3000 locations simultaneously. There is also an internal diffraction limited camera with a 20x20 arcsec field of view. Both the camera and spectrograph can operate at wavelengths between 1 and 2.4 microns. The center of the imaging camera’s field is about 20 arcsec offset from the center of the spectrograph field and both can be used simultaneously with the same or different filters.
The spectrograph has plate scales of 0.02, 0.035, 0.05 and 0.10 arcsec per lenslet. The spectral resolution averages 3800 in the three finest plate scales, but is closer to 3400 in the 0.100 arcsec plate scale. In the broadband mode each spectrum contains a full broad band (z, J, H or K) and a total of 16x64 (actually 1019) spectra are taken. In the narrowband mode, a typical spectrum contains 1/4th of a broad band and an individual exposure contains between 16x64 to 48x64 spectra depending on the exact filter selected. The imager has a single fixed plate scale of 0.020 arcsec per pixel.
A great deal of thought has gone into trying to make OSIRIS easy to use. For the spectrograph, the only user selectable items are the plate scale, the filter, and the exposure time. The imager only has a filter and an exposure time setting. A great deal of complexity, however, is allowed in the observing sequences and the slaving of the imager to the spectrograph. All setup and control aspects of the instrument are managed by a few GUIs.
There is also a data reduction system that includes a “real-time” reduction of raw frames into cubes for display and basic analysis. In this real-time mode, it takes about one minute for a preliminary data cube to appear in the “quicklook” display package. The reduction system also includes a growing set of final reduction steps including correction of telluric absorption and mosaicing of multiple cubes.
First light was obtained on February 22, 2005 - See OSIRIS team pictures!
The OSIRIS team and Keck staff would like to help OSIRIS users achieve a successful and rewarding observing experience! OSIRIS is an innovative and unique spectrograph, and hence it takes more preparation than traditional spectrographs with planning and reductions. We suggest looking over the OSIRIS manual prior to your observing run as well as the Keck OSIRIS webpage for further telescope and AO information. We have included links to the packages you will need for pre-observing (manual and planning GUI) and post-observing (Quicklook2 and data reduction pipeline).
Software Installation Script for Mac OS X (and other OSes too, probably; it should work on Linux and other Unixes just fine, though has not been extensively tested there) - This script automatically downloads and installs the pipeline and all related packages into a user specified directory with the correct environmental variables. This script now automatically puts in 'idl -32' in the 'run_odrp' script to run with the compiled C library for the DRS. - Download install_osiris_drs_v3.2.python. To run this script, just type python install_osiris_drs_v3.2.python at the command prompt.
User's Manual (pdf) - (v2.3 03/01/2010) Please refer to the OSIRIS manual
for a complete description of OSIRIS capabilities, observational
procedures, data reduction system, detector performance, filter
curves, and much more.
Observing Planning GUI (tar.gz) - (zip) (v1.5 - 04/01/2008) - OSIRIS observers can generate and save planning scripts, data definition files (.ddf), for observing with the spectrograph and imager by using the Observing Planning GUI. This java package will be identical to what you will be using at the telescope and requires java 1.4 or higher. To use, download and unpack the package and refer to the README file.
Quicklook2 Package (tar.gz) (v2.2 - 04/01/2008) - OSIRIS spectrograph frames are 3D FITS files that require sophisticated image visualization tools. The OSIRIS team presents an IDL based software package called Quicklook to display and analyze your OSIRIS data cubes. Quicklook is the OSIRIS image analysis software used at Keck while observing, but we also encourage using Quicklook for post-observing analysis of 2-D and 3-D fits frames. To use, simply download the tar file and unpack the file somewhere in your IDL path. Edit the environment variable 'QL_FILEDIR' in the file 'run_ql2' to match the directory path where you just unpacked Quicklook2.tar file. Once this environment variable has the correct path, you are ready to start using Quicklook2. Type 'run_ql2' at your terminal prompt within the same directory, and this script should launch Quicklook2 program and place the IDL xterm in an icon. In Windows, type 'run_wql2' at the IDL prompt. This software package supports the UNIX, LINUX, Mac OS, and Windows operating systems and operates on IDL versions 5.4 or higher.
The OSIRIS team would prefer the following reference to be cited
when referring to the instrument in publication:
Larkin et al. 2006, Proceedings of the SPIE, Volume 6269, pp. 62691A (2006)
OSIRIS engineering team: James Larkin, Matthew Barczys, Alfred Krabbe, Sean Adkins, Ted Aliado, Paola Amico, George Brims, Randy Campbell, John Canfield, Thomas Gasaway, Allan Honey, Christof Iserlohe, Chris Johnson, Evan Kress, David Lafreniere, Ken Magnone, Nick Magnone, Michael McElwain, Juleen Moon, Andreas Quirrenbach, Gunnar Skulason, Inseok Song, Michael Spencer, Jason Weiss, and Shelley Wright
OSIRIS commissioning team: James Larkin, Matthew Barczys, Alfred Krabbe, Christof Iserlohe, Michael McElwain, Andreas Quierrenbach, Jason Weiss, and Shelley Wright
OSIRIS Keck support team: Jim Lyke, Randy Campbell, and Al Conrad
OSIRIS data reduction pipeline team: James Larkin, Shelley Wright, Jason Weiss, Mike McElwain, Marshall Perrin, Christof Iserlohe, Alfred Krabbe, Tom Gasaway, and Tommer Wizanski
OSIRIS Quicklook2 package: Michael McElwain, Jason Weiss,
Marshall Perrin, and James Larkin
"Diffraction-limited Imaging Spectroscopy of the Sagittarius A* Region Using OSIRIS, a New Keck Instrument"
Krabbe et al. 2006, ApJL, Volume 642, Issue 2, pp. L145-L148
"First High-Contrast Science with an Integral Field Spectrograph: The Substellar Companion to GQ Lupi"
McElwain et al. 2007, ApJ, Volume 656, Issue 1, pp. 505-514
"Integral Field Spectroscopy of a Candidate Disk Galaxy at z ~ 1.5 Using Laser Guide Star Adaptive Optics"
Wright et al. 2007, ApJ, Volume 658, Issue 1, pp. 78-84
"LGS AO Integral Field Spectroscopy of a Narrowly Collimated Jet from the Herbig Ae Star LkHa 233"
Perrin & Graham 2007, ApJ, 670, 499
"Tvashtar awakening detected in April 2006 with OSIRIS at the W.M. Keck Observatory"
Laver, de Pater, & Marchis 2007, Icarus, 191, 749
"Widespread Morning Drizzle on Titan"
Ádámkovics et al. 2007, Science, 318, 5852, 962
"Integral Field Spectroscopy of High-Redshift Star Forming Galaxies with Laser Guided Adaptive Optics: Evidence for Dispersion-Dominated Kinematics" Law et al. 2007, ApJ, 669, 929
"High-contrast imaging with Keck adaptive optics and OSIRIS"
McElwain et al. 2008, SPIE, 7015
"A Near-Infrared Variability Study of the Galactic Black Hole: A Red Noise Source with NO Detected Periodicity"
Do et al. 2009, ApJ, 691, 1021
"The Role of Molecular Gas in Obscuring Seyfert Active Galactic Nuclei"
Hicks et al. 2009, ApJ, 696, 448
"The Kiloparsec-Scale Kinematics of High-Redshift Star-Forming Galaxies"
Law et al. 2009, ApJ, 697, 2057
"Dynamics of Galactic Disks and Mergers at z~1.6: Spatially Resolved Spectroscopy with Keck Laser Guide Star Adaptive Optics"
Wright et al. 2009, ApJ, 699, 421
"An OSIRIS Study of the Gas Kinematics in a Sample of UV-Selected Galaxies: Evidence of "Hot and Bothered" Starbursts in the Local Universe"
Basu-Zych et al. 2009, ApJL, 699, L118
"The global distribution of sulfur dioxide ice on Io, observed with OSIRIS on the W.M. Keck telescope"
Laver & de Pater 2009, Icarus, 201, 72
"Component-resolved Near-infrared Spectra of the (22) Kalliope System"
Laver et al. 2009, Icarus, 204, 574
"Probing young massive clusters with laser guide star adaptive optics"
McCrady, N. 2009, ApSS, 324,109
"Evidence for strong dynamical evolution in disc galaxies through the last 11 Gyr. GHASP VIII - a local reference sample of rotating disc galaxies for high-redshift studies"
Epinat et al. 2010, MNRAS, 401, 2113
"The Presence of Weak Active Galactic Nuclei in High Redshift Star Forming Galaxies"
Wright et al. 2010, ApJ, 711, 1291
"Resolved spectroscopy of gravitationally lensed galaxies: recovering coherent velocity fields in subluminous z ~ 2-3 galaxies"
Jones et al. 2010, MNRAS, 369
"Discovery of a Young L Dwarf Binary, SDSS J224953.47+004404.6AB"
Allers et al. 2010, ApJ, 715, 561 (using OSIRIS Imager)
"The Lick AGN Monitoring Project: The MBH - sigma Relation For Reverberation-Mapped Active Galaxies"
Woo et al. 2010, ApJ, 716, 269
"The 2008 Outburst in the Young Stellar System Z CMa: The First Detection of Twin Jets"
Whelan et al. 2010, ApJ, 720L, 119W
"Near-infrared Spectroscopy of the Extrasolar Planet HR 8799 b"
Bowler et al. 2010, ApJ, 723, 850
"The Black Hole Mass in Brightest Cluster Galaxy NGC 6086"
McConnell et al. 2010, arxiv:1009.0750 U
"Measurement of a Metallicity Gradient in a z=2 Galaxy: Implications for Inside-Out Assembly Histories"
Jones, Ellis, Jullo, & Richard 2010, arxiv:1010.1538
"Clouds and Chemistry in the Atmosphere of Extrasolar Planet HR8799b"
Barman, Macintosh, Konopacky, Marois 2011, arxiv:1103.3895
"The Nature of Double-peaked [O III] Active Galactic Nuclei"
Fu, Hai; Yan, Lin; Myers, Adam D.; Stockton, Alan; Djorgovski, S. G.; Aldering, G.; Rich, Jeffrey A, ApJ, 745, 67F
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