... The J, H and K bands are characterized by a bright background, such a background is mainly due to the emission of atmospheric lines and of thermal radiation. ... If the source cover a large fraction of the slit, spectra off-source must be observed to adequately sample the sky background. ... The on chip integration time (time spent in each position of the slit) must not exceed 40 seconds in J and H bands and 60 seconds in K band. ... We suggest a sequence of 10 for each elementary integration time. ...

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• Fine Shades of a Sombrero (PR Photos 07a-c/00)

Next: *imcalc* - Obtain a Up: Calibration Previous: Exposure Map . Background maps are provided by the standard processing for all ROSAT and Einstein instruments. For the PSPC and IPC these are in three standard bands: soft, hard, and broad (Table 6.2). ... N.B.: ROSAT PSPC background maps in SASS 5-6 or higher are generated by smoothing a source-subtracted, exposure corrected image (see the ROSAT Data Products Guide). ... imcalc* - Obtain a background subtracted image for ROSAT PSPC Data . ...

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• Richard Edgar - Diffuse X-ray Spectrometer (DXS) Home Page

STIS Instrument Handbook for Cycle 24 . ... Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 24 > Chapter 12: Special Uses of STIS > 12.1 Slitless First-Order Spectroscopy . ... Slitless First-Order Spectroscopy . ... The use of a long slit ensures a clean separation of emission lines arising from different spatial features. ... Figure 4.8 shows an image of SN1987A observed using the 52X2 aperture, and as the source is smaller than the slit, this is effectively a slitless image. ...

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• WFC3 Instrument Handbook
• ACS Instrument Handbook for Cycle 20
• Space Telescope Imaging Spectrograph Instrument Handbook

... rgsspectrum creates an OGIP-compliant spectrum of counts for a single RGS exposure. ... background-corrected source spectrum . ... Note that although the spatial selection region for the background spectrum is not source-specific, the energy selection region is source-specific, and for this reason the background spectrum is technically source-specific. ... The above description of the BACKSCAL column applies only to Spectroscopy mode data; in HTR mode this column has nothing to do with exposure. ...

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... The new emission line galaxies are listed in Table 2 containing the following information: . column 1: The object's IAU-type name with the prefix HS. ... This was not corrected in the figure shown in Appendix A. HS1214+3801 : This is seemingly a supergiant H II -region at the very rim of the nearby edge-on disc galaxy (SA(s)cd) NGC 4244 (V hel = 224 kms -1 and B T =10.88). ... To check this option one needs a detailed map of the NGC 4244 velocity field including HS 1214+3801. ...

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• Instrument configuration and run-specific information
• Calibration Frames and Naming Convention
• Optical spectroscopy

... We present a simple, effective technique that allows the contemporary spectroscopy of all the objects, up to a limiting magnitude, contained in a 100 arcmin 2 field. ... For this reason, we have developed a technique, that allows the simultaneous spectroscopy of all the objects included in a square field of view with 10 side, using the widely used FOSC-type optical spectrometer and camera focal-plane instruments. ... Thus the flux calibration of the slitless spectra was also straightforward. ...

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• ADASS 2003 Conference Proceedings
• Towards Optimal Analysis of HST Crowded Stellar Fields
• An Object Oriented Design for Monitoring the Chandra Science Instrument X-ray

... Astrophysics Group . ... Integration of the NIRSpec instrument . ... SKA AAVS0 array . ... One of the major milestones for the James Webb Space Telescope (JWST) has been, in September 2013, the completion by ESA of NIRSpec, the first multi-object spectrograph to be operated in space. ... Cambridge, and in particular the Cavendish Astrophysics Group and the Kavli Institute for Cosmology, is heavily involved in NIRSpec by hosting one of the Instrument Science Team members (R. Maiolino). ...

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The VLTI Calibrator Selector Tool is a tool intended to assist in the selection of suitable interferometric calibrators for VLTI observations with MIDI and AMBER. It uses a model of the VLTI and its instruments to assess the fringe visibility, given the observed bandpass, the geometry, spectrum, and coordinates of the target and the time at which the observations are to be made. ... The tool offers an HTML/Java based interface and consists of two pages. ... The quality flag depends on LDD_chi2. ...

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• ESO - GRAVITY VLTI Instrument Under Integration on Paranal
• HAWK-I Exposure Time Calculator
• ESO - Integration Cryo-vacuum

APO/GIFS Instrument Factsheet The Goddard imager and Integral Field Spectrograph (GIFS) has recently been commissioned on the APO 3.5 m telescope. This factsheet presents a high level overview of the GIFS instrument. ... GIFS Imaging The GIFS imaging mode is used for imaging science and target acquisition for the IFS mode. ... Imaging Mode pixel scale: 0.168"/pixel · Comparison to Other APO 3.5m instruments: The GIFS field of view is smaller than SPICAM, but the filter set is far more extensive. ...

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• ARC 3.5m | Instrumentation
• Astrophysical Research Consortium - Apache Point Observatory
• ARC 3.5-m Instrument News Page

... We present a simple, e#ective technique that allows the con­ temporary spectroscopy of all the objects, up to a limiting magnitude, contained in a # 100 arcmin 2 field. This technique makes possible the immediate and unambiguous identification of peculiar objects included in the field. ... We show that this technique should also be quite useful in emission line and WR star surveys, and illustrate the software procedures devel­ oped to make the wavelength and flux calibration of these spectra. ...

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• Near IR Astronomy with the ESO VLT
• Instrument science
• Unusual Emission near a Compact Source in Orion

Next: The Transmission Gratings Up: The Instruments Previous: The Instruments . ... A conventional cross-grid charge detector reads out the photo-induced charge cloud and the electronics determine an arrival time to 16s, and the position with a resolution of about 18 m or 0.37 arcsec. ... The Massachusetts Institute of Technology's Center for Space Research, in collaboration with Lincoln Laboratories, developed the detector system and manufactured the CCDs; Lockheed-Martin integrated the instrument. ...

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• AXAF-Chandra
• The Instruments