normal galaxies sample from 2df-xmm wide angle survey
DESCRIPTION
X-ray & Observational Astronomy. Normal Galaxies Sample From 2dF-XMM Wide Angle Survey. Yueheng Xu. Jonathan Tedds, Silvia Mateos, Mike Watson, Matthew Page, Francisco Carrera, Mirko Krumpe, Jacobo Herrero, Amalia Corral … XMM-Newton SSC. X-ray & Observational Astronomy. - PowerPoint PPT PresentationTRANSCRIPT
Normal Galaxies Sample From
2dF-XMM Wide Angle Survey
Jonathan Tedds, Silvia Mateos, Mike Watson, Matthew Page, Francisco Carrera, Mirko Krumpe, Jacobo Herrero, Amalia Corral … XMM-Newton SSC
X-ray & Observational AstronomyX-ray & Observational Astronomy
Yueheng Xu
2dF-XMM Wide Angle Survey
10 degree2
> 3000 X-ray sources from ~ 70 XMM observations
Optical spectra from 2dF system on AAT in 27 pointings
> 1000 sources spectroscopically identified
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X-ray & Observational AstronomyX-ray & Observational Astronomy
2dF spectral identifications
GAL: absorption line galaxies NELG: narrow emission line galaxies
BLAGN: broad line AGN STARs
X-ray & Observational AstronomyX-ray & Observational Astronomy
Sample selection:
Galaxies with:
• (1) Absorption line or narrow emission line 2dF spectra i.e. GAL or NELG
• (2) X-ray flux to optical flux ratios ≤ 0.1, i.e. log10 (fX / fOPT) ≤ -1fX in 0.2-12 keV, and log10 (fX / fOPT) calculated aslog10 (fX/fOPT) = log10fX + 5.5 + R/2.5
• (3) X-ray luminosities LX ≤ 1043 erg s-1
LX in 0.2-12 keV
X-ray & Observational AstronomyX-ray & Observational Astronomy
Sample selection:
+
Sample sources
NELG
GAL
BLAGN
Star
NELG
GAL
BLAGN
This work
The sample includes 72 normal galaxy candidates with the mean z of 0.13.This makes up ~40% of the X-ray emitting galaxies (R < 19) in the area – essentially those which would meet our selection criteria.
X-ray & Observational AstronomyX-ray & Observational Astronomy
Information available:
X-ray: spectra/hardness ratios, extent
Optical: image, spectra
Other wavelengths: Radio, IR…
X-ray & Observational AstronomyX-ray & Observational Astronomy
HIIComposite HII
AGN Seyfert
LINER
AGN (definite and tentative)
HII-region like galaxy (definite and tentative)
Galaxies are marked based on their final classifications, which does not include Composite type as an independent type. AGN type includes Seyfert and LINERs. One σ errors are shown only when the source has been definitely classified under the line ratio diagnostic classification schema.
Emission line ratio classification
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HR2=(CR3-CR2)/(CR2+CR3)HR3=(CR4-CR3)/(CR3+CR4)
CR2: 0.5-1.0 keVCR3: 1.0-2.0 keVCR4: 2.0-4.5 keV
Galaxies are marked based on their final classifications.
Green grid: non-thermal (power-law) model with Γ = 0.75, 1.0, 1.5, 2.0, and 2.5 from top to bottom, and NH = 0, 1×1020, 1×1021, 5×1021, 1×1022, and 5×1022 cm-2 from left to right.
Blue grid: thermal model (APEC) with kT = 0.1, 0.25, 1.0, 1.5, 2.0, 2.5 and 3.0 keV from bottom to top, and NH = 0, 1×1020, 1×1021, 5×1021 cm-2 from left to right.
AGN (definite and tentative)
HII-region like galaxy (definite and tentative)
Hot gas halo (definite and tentative)
Normal galaxy
X-ray hardness ratio diagram
X-ray & Observational AstronomyX-ray & Observational Astronomy
X02262_00066z = 0.066
NH (intrinsic) = 45.2 (-16.6, +29.7) 1020 cm-2 Power-law: Г = 1.64 (-0.33, +0.38)
Absorbed AGN candidate. The 2dF optical spectrum lacks strong emission lines, but the absorbed hard XMM X-ray spectrum and relatively high X-ray luminosity (LX ≈ 4.7 × 1041 erg s-1) indicate a possible obscured AGN.
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X02418_00068z = 0.077
Raymond-Smith: kT = 0.69 (-0.18, +0.14) keV+Power-law: Г = 1.80 (-0.40, +0.40)
Starburst Galaxy. The 2dF optical spectrum of this system shows evidence of existence of strong star-forming activity. The XMM X-ray spectrum requires both hard and soft components, which is consistent with the co-existence of a starburst and an AGN found in infrared (Farrah et al. 2003).
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X21226_00075z = 0.084
Raymond-Smith: kT = 0.80 (-0.07, +0.05) keV
Gas halo. X-ray source extent and the soft XMM spectrum suggest that this galaxy sits within a group of galaxies (also evident in optical image). The 0.2-12 keV luminosity derived from the best fit model is ~ 1.8 × 1041 erg s-1.
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Breakdown of source types:
definite tentative fraction of the sample
AGN 13 (18%) 17 (24%) 42%
HII-region like galaxy 10 (14%) 1 (1%) 15%
Has halo 12 (17%) 4 (6%) 22%
Normal galaxy 17 24%
TOTAL 72
After excluding the AGN type sources from the sample, the remaining normal or star-forming galaxies have z = 0.027-0.3, log10 (fX / fOPT) = (-3.5)-(-1), LX = 1040.1-42.4 erg s-1.
Among the AGN (definite or tentative) in the sample, there are 5 possible XBONGs, whose AGN features are not accessible in optical spectra but have hard X-ray hardness ratios and/or high X-ray luminosities (LX > 1042 erg s-1).
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Whole Sample
Normal(and unclassified!)
HII
GAS
AGN