spectral energy distributions of 2xmm-selected agn & vo-tools rodrigo gil-merino instituto de...
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Spectral Energy Distributions of 2XMM-selected AGN & VO-tools
Rodrigo Gil-MerinoInstituto de Física de Cantabria (CSIC-UC)
Santander, Spain
MAVO workshop, ESAC Madrid, Dec. 2008
EURO-VO A
IDA
supp
orte
d pr
oject
• Background:– Preliminary classification from 2XMM selected objects
– Extragalactic data base (NED) and the 2XMM catalogue
• Motivation:– Obtain all available photometry for selected objects
– Build the SEDs from this photometry
– Multi-wavelength properties of the sample
• Feasibility:– Existing tools related to this proposal
– Massive queries through VO-compliant catalogues
– Automatic classification of data
Background
The 2XMM catalogue: largest X-ray objects collection:
• Serendipitous X-ray sources from observations taken between February 2000 and March 2007.
• Includes ~191000 unique sources, from ~247000 detections, most being AGN.
• Covers ~1% of the total sky.
NASA Extragalactic Database: largest extragalactic database
Catalogues cross match (no VO):
~4700 objects with z+other catalogues
~191.000 objects2XMM
types I & II: 1700
candidates: 500AGN
Objects, according to NED (no VO)
Galaxies: ~1800
Others
starbursts: 32
liners: 33
XBONGs: 9
problems with AGN clasification
very heterogeneus data
Secure subsample with VO-tools!
AGN type I: ~300
QSOs: ~900
Galaxies: ~1800
AGN type II: ~100
Veron-Cetty & VeronVO explorer: AGN catalogue?
QSO: MB < -23
from NED AGN sampleand
Veron-Cetty & Veron
still from NED
AGN I : MB > -23broad lines
AGN II: MB > -23narrow lines
Topcat
Redshift distributions:
galaxies (~1800)
QSOs (~900)
AGN type I (~300)
AGN type II (~100)
Lx vs. redshift: AGN
blue: QSOs (~900)red: AGN type I (~300)green: AGN type II (~100)
Lx vs. redshift: galaxies
AGNs…
red: galaxiesblue: VisS (gal)
~1400 with Lx>1e42 erg/s~ 400 with Lx<1e42 erg/s
HS distributions: AGN I & II
HS=(H-S)/(H+S) H: hard (2-12 keV) S: soft (0.5-2 keV)
(EPIC-PN only)
AGN type I (~300)
AGN type II (~100)
QSOs (~900)
Galaxies (~1300)
HS distributions: galaxies vs. AGN
HS=(H-S)/(H+S) H: hard (2-12 keV) S: soft (0.5-2 keV)
(EPIC-PN only)
all AGNs (~1300)
NH vs. Lx(2-10keV): AGNs
log (LX)
log
(NH
)
NH vs. Lx(2-10keV): galaxies
HS vs. log(fx/fopt): AGNs
QSOsAGN types I & II
increasing absorption
increasingX-loudness
HS vs. log(fx/fopt): galaxies
galaxies, Lx>1e42 erg/s
galaxies, Lx<1e42 erg/s
Conclusions (so far):
• 2XMM catalogue useful to re-classify many extragalactic sources
• ~1300 galaxies show indications of being AGNs, mainly type I
• Results in a sample of ~3000 X-ray selected AGN
• VO-tools: “secure sample” & analysis
• AGN are multi-wavelength emitters and we need multi-band photometry to well understand them.
• General emission and absorption mechanisms are well accepted, but not their relative importance
• This is crucial to establish the general features of each class of AGN and the validity of the general unified scheme.
Motivation
Spectral Energy Distributions:
(Elvis et al. 1994 ApJ 95)
Feasibility
• Build the SEDs of ~3000 AGN (restframe)
• Analyse them and compute the “mean” SEDs in luminosity, redshift and by types
• Study most extreme cases of outliers in the SEDs sample
• Use SEDs to re-classify the sample when possible
EURO-VO proposal:
Requirements from VO-tools:
• VOSED: – for each query, can we obtain just one file for the whole SED?– can we add catalogues?.... We couldn´t find all (XMM, APM..)– can we apply any quality criteria?
• VO-Spec:– can we load any SED as a spectrum? (It works from VOSED)– we need to do statistics on large number of spectra, can we?
• WE NEED a batch system to be able to launch multi-position/object queries (out sample contains ~3000 objects, no way one by one)
Acknowledgements
• EURO-VO AIDA framework: is an excellent opportunity to present a science case with special VO-tools needs.
• VO people is working really hard to make this possible, doing an excellent job for us.
THANKS !!
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