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Normal Galaxies Sample From 2dF-XMM Wide Angle Survey

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.

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Normal Galaxies Sample From 2dF-XMM Wide Angle Survey

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  1. 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

  2. X-ray & Observational Astronomy 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

  3. X-ray & Observational Astronomy 2dF spectral identifications NELG: narrow emission line galaxies GAL: absorption line galaxies BLAGN: broad line AGN STARs

  4. X-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) ≤ -1 • fX in 0.2-12 keV, and log10 (fX / fOPT)calculated as • log10 (fX/fOPT) = log10fX + 5.5 + R/2.5 • (3) X-ray luminosities LX≤ 1043 erg s-1 • LX in 0.2-12 keV

  5. X-ray & Observational Astronomy NELG GAL BLAGN This work Sample selection: Sample sources NELG GAL BLAGN + Star 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.

  6. X-ray & Observational Astronomy Information available: • X-ray: spectra/hardness ratios, extent • Optical: image, spectra • Other wavelengths: Radio, IR…

  7. X-ray & Observational Astronomy AGN Seyfert LINER HII HII Composite AGN (definite and tentative) HII-region like galaxy (definite and tentative) Emission line ratio classification 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.

  8. X-ray & Observational Astronomy AGN (definite and tentative) HII-region like galaxy (definite and tentative) Hot gas halo (definite and tentative) Normal galaxy X-ray hardness ratio diagram 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.

  9. X-ray & Observational Astronomy NH (intrinsic) = 45.2 (-16.6, +29.7) 1020 cm-2 Power-law: Г = 1.64 (-0.33, +0.38) X02262_00066 z = 0.066 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.

  10. X-ray & Observational Astronomy Raymond-Smith: kT = 0.69 (-0.18, +0.14) keV + Power-law: Г = 1.80 (-0.40, +0.40) X02418_00068 z = 0.077 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).

  11. X-ray & Observational Astronomy Raymond-Smith: kT = 0.80 (-0.07, +0.05) keV X21226_00075 z = 0.084 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.

  12. X-ray & Observational Astronomy 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).

  13. X-ray & Observational Astronomy AGN Whole Sample Normal (and unclassified!) GAS HII

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