European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)
Multi-wavelength Astronomy using VOSpec
Deborah Baines
European Space Astronomy Centre (ESAC)Science Archives and VO Team
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
Outline
The VOSpec tool and it’s functionalities
Access to services: Simple Spectral, Simple Line and Theoretical Services
VOSpec Demo
VOSpec in the literature
Summary
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
VOSpec Multi-wavelength spectral
analysis tool developed at ESAC by ESA-VO
Create a SED with spectra from:• a wide range of different providers
registered in the VO Registry• local data (FITS, ASCII, VOT)• User-friendly (true!) SSAP
Wrapper applied on your own set of local spectra.
Graphical options:• plot colour, title and axis label
modifications• Zoom/unzoom • Automatic conversion of all units
via dimensional analysis.
ISO LWSHST
ISO PHT
EUVE
HUT
HST FOSIUE
INES
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
VOSpec: spectral analysis functionalities
Line fitting (Gaussian, Lorentzian, Voigt).
Rest-frame (redshift correction) Spectral arithmetic and convolution
between spectra. De-reddening
• Calzetti law• Cardelli-O’Donnell law• LMC
Fit of an absorption line profile with different models (Gaussian, Lorentzian, Voigt)
Arithmetic between spectra
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
Continuum fitting (BB, polynomial). Integrated flux, line flux and equivalent
width calculations. Filtering
• Averaging • Convolution• Wavelet
Tuning: rebinning, reject zero points, cut spectrum.
Mirroring: line and spectrum mirroring. Bisector Wavelength-to-velocity conversion.
Polynomial fitting
VOSpec: spectral analysis functionalities cont.
Filtering
Bisector applied to a spectrum in velocity space
Line MirroringSpectrum Mirroring
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
Simple Spectral Access (SSA) services
SSA services accessed by VOSpec• SSA services registered in the VO
registry.• Over 30 services.• 10 within the past year which
include:• Hubble Legacy Archive (HLC)
(near-UV to near-IR)• AXIS-XMS (An XMM
International Survey – X-ray Medium Survey). 319 X-ray sources observed in optical.
• EPIC Spectra for the 2XMMi Catalogue. 96176 EPIC spectra.
• HEROS spectrograph, 6000 high resolution (R=20000) spectra, in optical.
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
Simple Line Access through VOSpec
VOSpec provides access to atomic and molecular line Databases (SLAP):– NIST Atomic Spectra– CHIANTI (X-rays)– CIELO (XMM-Newton)– IASD (ISO)– LERMA (molecular)– STSCI (UV)
• This allows on-the-fly identification of transitions associated to a given observed feature.
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
Access to Theoretical models (TSAP)
10 Theoretical Spectral Services accessed by VOSpec which include: • Evolutionary synthesis
models • Models of stellar
atmospheres, e.g. Kurucz, PGos3
• D’Alessio models of pre-main sequence stellar discs.
The VOSpec Normalization tool can be applied to both theoretical and non-calibrated spectra.
Kurucz stellar model and D’Alessio model of PMS discs fit to UV and IR spectra of HD 141569
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
The power of interoperability
GB2MASS SDSS
ROSATChandra
AstroScope: catalogue search
Aladin: multipanel imaging
VOSpec: generation of SEDsTOPCAT: tabular data plotting/manipulation
(PLASTIC)
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
Demo – A typical session:
http://www.sciops.esa.int/SD/ESAVO/images/VOSpec/VOSpec_ABAur_flash.htm
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
VOSpec in the literature Scientific cases/papers (not complete):
• Guainazzi M. et al (2008) ‘Catalogue of ionized emission line spectra in obscured AGN’, AdSpR, 41, 1998.
• Guainazzi et al (2007) ‘A VO-based solution to the origin of soft X-ray emission in obscured AGN’, HiA, 14, 582, Proceedings of the IAU, 2006.
• Richards, et al (2005) ‘Hunting post-AGB/RSG objects using Virtual Observatories and other internet-based technology’, MmSAI, 76, 467.
Technical papers: • Laruelo A. et al (2008) ‘VOSpec Spectral Analysis Tools’, ASPC, 394,
513.• Salgado J. et al (2007) ‘How to Access Spectral Line Databases in the
IVOA: SLAP Services in VOSpec’, ASPC, 376, 603.• Osuna P. et al (2006), ‘Theoretical Support to Observational data in VO
Context’, ASPC, 351, 363.
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
VOSpec Summary
On-the-fly SED generation with VOSpec
- Spectra access from SSAP-compatible server
- Automatic handling of units Spectral analysis tools
- Large number of spectral analysis tools available
- Multi-component fit possible Interoperability
- VOSpec uses PLASTIC Literature
- VOSpec beginning to be used by the scientific community Usage on large sets of data
- Mainly designed to handle one source at the time → highly interactive.
- Good News: ability to handle large lists of objects about to be developed.
European Space Astronomy Centre (ESAC)Villafranca del Castillo, MADRID (SPAIN)Deborah BainesESAC, 1-3 Dec 2008
To know more VOSpec web pages:http://esavo.esac.esa.int ->http://www.sciops.esa.int/index.php?project=ESAVO&page=vospec
To launch VOSpec:
http://esavo.esac.esa.int/vospec/
