Multi-wavelength Astronomy using VOSpec Deborah Baines European Space Astronomy Centre (ESAC)
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Transcript of Multi-wavelength Astronomy using VOSpec Deborah Baines European Space Astronomy Centre (ESAC)
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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
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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
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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
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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
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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
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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.
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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.
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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
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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)
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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
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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.
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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.
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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/