R. González-Riestra

P.M. Rodríguez-Pascual

XMM-Newton Science Operations Centre

ESAC

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

X-ray high resolution spectra in the VO:the case of XMM-Newton RGS

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

Can X-Ray spectra be included in the VO ?

• Not calibrated • Response matrices are not invertible• Fluxes are model dependent

• In some cases response matrices are nearly diagonal• Calibrated data - useful for some purposes, when detailed spectral analysis is not required - can be provided • Example: XMM-Newton RGS spectra

NO

YES

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

• Operates in parallel with the EPIC cameras and the Optical Monitor

• Provides X-ray high resolution (R = 100 - 500) spectroscopy in the spectral range 6 - 39 Å

• Extracted spectra can be corrected for the effective area and provided in physical units (Flux vs. Wavelength): RGS fluxed spectra

RGS: The XMM-Newton Reflection Grating Spectrometer

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

• Currently RGS data are not uniformly processed (different versions of SW and of Calibration Files)

• Fluxed spectra are not produced in the standard pipeline processing

Database containing:

• ~ 4600 RGS fluxed spectra uniformly processed

• Plus some ‘added value’ items relevant to the interpretation of the data

• Tool for data browsing and evaluation

Browsing interface for RGS Data

a Browsing interface for RGS Data

Search by:• Object name • Coordinates• Observing date• Observation Id

Additional search criteria:• Type of object• Quality• Hydrogen Column• Redshift• Exposure time

Optional output fields:• Simbad name• Simbad Type• Simbad Coordinates• Observing date• Exposure time• Quality• Hydrogen Column• Redshift

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

a Browsing interface for RGS Data

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sample selection plotting options

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

a Browsing interface for RGS Data

Single Spectrum Plot

Multiple Spectra Plot

Average Spectrum Plot

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

a Browsing interface for RGS Data• For a single object • For a class of objects• For an user-defined sample

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

a Browsing interface for RGS Data

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

a Browsing interface for RGS Data

Astronomical Spectroscopy and the Virtual Observatory, March 21st 2007, ESAC

A wish list for a visualization tool for spectra

• Data sets uniformly processed and calibrated

• Estimation of the quality of the data

• Basic plotting and display tools (rebinning, smoothing ...)

• Comparison of spectra and images, if applicable

• Ability to build sub-samples of data with specific characteristics (date of observation, redshift...)

• Access to additional information (object classification, parameters pertinent to the specific dataset, publications…) of relevance for the interpretation of the data