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

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• 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 !!