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AKARI IRC survey of the Large Magellanic Cloud

AKARI IRC survey of the Large Magellanic Cloud. Yoshifusa Ita, Daisuke Kato,Takashi Onaka, & AKARI LMC team. Index. Part 1 A brief summary of the AKARI IRC LMC survey Part 2 A brief description of the AKARI LMC point source catalog Part 3

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AKARI IRC survey of the Large Magellanic Cloud

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  1. AKARI IRC surveyof the Large Magellanic Cloud Yoshifusa Ita, Daisuke Kato,Takashi Onaka, & AKARI LMC team AKARI2 @ Jeju

  2. Index • Part 1 • A brief summary of the AKARI IRC LMC survey • Part 2 • A brief description of the AKARI LMC point source catalog • Part 3 • A brief introduction of published results using the early survey data AKARI2 @ Jeju

  3. Part 1: A brief summary of the AKARI IRC LMC survey AKARI2 @ Jeju

  4. The AKARI IRC LMC surveyPI. Prof. Onaka Takashi Observed area • Observation • ~600 pointings • 2006/Feb - 2007/July • About 10 degree^2 • Photometry • 3.2, 7, 11, 15, 24 um • Spectroscopy • NP (2.5 - 5.0 um) • λ/Δλ ~ 20 = 10’ x 10‘ AKARI2 @ Jeju

  5. Comparison to the other surveys • Orange • AKARI survey ~10 deg^2 • Pink • South Africa IRSF/SIRIUS JHK survey ~ 6.3 deg x 6.3 deg • Green • Spitzer SAGE survey ~7 deg x 7 deg • Cyan • Zaritsky Optical (UBVI) survey ~ 8.5 x 7.5 deg AKARI2 @ Jeju

  6. Comparison to the SAGE survey: λand spectroscopy • AKARI has 11 and 15μm imaging bands, which fill the gap between the IRAC and MIPS. • see next page • In addition to the photometric data, we also took low resolution (λ/Δλ ~ 20) 2.5 ~5 μm spectral data. AKARI SAGE/Spitzer An o-rich AGB star A c-rich AGB star AKARI2 @ Jeju

  7. 5 sigma detection limits IRC+10216: an extreme c-rich AGB star β And: a tip of the RGB star AB Aur : a Herbig Ae/Be star AKARI2 @ Jeju

  8. 2.5-5um spectra for sources in the observed 10 deg^2 field. Refer to Shimonishi’s Talk for initial results using the spectroscopic data FOV = 10’ x 10’ AKARI2 @ Jeju

  9. Summary of the survey • A 10 deg^2 area was observed with AKARI • Imaging data • 3.2, 7.0, 11, 15, 24 um • detection limits are comparable to those of the SAGE survey • Spectroscopic data • 2.5 – 5.0 um, λ/Δλ ~ 20 • The point source catalog is coming soon. (Kato, Ita, and Onaka et al.) Unique to AKARI AKARI2 @ Jeju

  10. Part 2: A brief description of the AKARI IRC LMC point source catalog AKARI2 @ Jeju

  11. Catalog compilation (1)Image data reduction • The latest IRC imaging data reduction toolkit ver.20110304 was used. • Ask Egusa-san for details.

  12. Catalog compilation (2)Source detection and photometry • Source detection • IRAF/DAOFIND • Photometry • IRAF/DAOPHOT • PSF fitting photometry • N3: satellite jitter → PSF vary in each image • S7~L24: insensitive to the jitter → grand PSF • Calibration • ADU to Jy conversion factors (Tanabe et al. 2008)

  13. Catalog compilation (3)Detection limits and Completeness • Detection Limits (10σ, vega-mag) • Completeness Limits (90% recovery limit) • Add artificial sources to images • Dense, Medium, Blank region (source number density) • Source extraction • Count the recovery rate Comparable to the 10σ detection limits except N3, which is about 2mag shallower.

  14. an example : N3magnitude vs. error AKARI2 @ Jeju

  15. Catalog compilation (4)Astrometric Calibration • Referenced to • 2MASS catalog positions • with a condition that at least 5 sources should be mached. • If matching with 2MASS positions failed • Alternative reference : Spitzer SAGE catalog • In some cases, matching with SAGE catalog failed due to small number of sources in the FOV • S11 : 1 images, L15 : 5 images, L24 : 74 images • Internal Positional Accuracy • 0.6” at N3, 0.3” at S7, and S11, • 1.0” at L15 and L24

  16. Catalog compilation (5)Flagging • Artifact Identification • mux-bleed, column pulldown, and ghosts • any sources within ±5 pixel belt area are flagged • ghosts (inc. suspected ones) are flagged • Multi-detected sources • Only the best S/N data is adopted • Final Products • Archive • lists all detected sources • more fainter sources, but with false detections • Catalog • only lists sources with SAGE counterparts • more reliable

  17. Figures from Kato’s paperTwo-Color diagram pink: YSO candidates cyan: background galaxy Gruendl & Chi(2009) blue: Naked stars orange: dusty O-rich stars green: dusty C-rich stars red: YSOs AKARI2 @ Jeju

  18. Figures from Kato’s paperColor-Magnitude diagram pink: YSO candidates cyan: background galaxy Gruendl & Chi(2009) AKARI2 @ Jeju

  19. Summary of the point source catalog • Two types of point source catalogs. • Archive • include all detected sources • Catalog • only include sources with SAGE counterparts • The point source catalog will be in public right after the acceptance of paper. (submitted to ApJ soon) • We want to release imaging data as well. • an GUI I/F to search images is needed.

  20. Part 3: A brief introduction of published results using the survey data AKARI2 @ Jeju

  21. Refereed Papers using AKARI/LMC data published so far. • Mori, Tamami I. et al., 2012,ApJ,744,68 • Observations of the near- to Mid-infrared Unidentified Emission Bands in the Interstellar Medium of the Large Magellanic Cloud • Ngeow, Chow-Choong et al., 2010,MNRAS,408,983 • Cepheid period-luminosity relation from the AKARI observations • Shimonishi, T. et al., 2010,A&A,514,12 • Spectroscopic observations of ices around embedded young stellar objects in the Large Magellanic Cloud with AKARI • Seok, Ji Yeon et al., 2008,PASJ,60,453 • Supernova Remnants in the AKARI IRC Survey of the Large Magellanic Cloud • Shimonishi, T., et al., 2008,ApJ,686,99 • AKARI Near-Infrared Spectroscopy: Detection of H2O and CO2 Ices toward Young Stellar Objects in the Large Magellanic Cloud • Ita, Y., et al., 2008,PASJ,60,435, • AKARI IRC Survey of the Large Magellanic Cloud: Outline of the Survey and Initial Results AKARI2 @ Jeju

  22. Ngeow, Chow-Choong et al., 2010,MNRAS,408,983 • Matched catalog with known Cepheid variables in the LMC. • P-L relation is derived. • important results to the evaluation of data reduction software • Linearity • Photometry AKARI2 @ Jeju

  23. There should be more to come. • There are six refereed paper published so far using the AKARI LMC catalog. • We hope you to write papers using the AKARI/LMC Point Source Catalog. AKARI2 @ Jeju

  24. Acknowledgements • Special thanks to: • Dr. Fumihiko Usui • He kindly helped us a lot to make our observations effectively and smoothly. AKARI2 @ Jeju

  25. Appendix AKARI2 @ Jeju

  26. LMC phase-3 observation • Observe almost the same regionas in phase1&2 • Bar region × • too crowded • Total 515 pointing • ΔΦ = π • Photometry & Spectroscopy • N3, NP phase3 Phase1&2 Green: April –May 2008 Blue: May – July 2008 Red: October 2008 Magenta: November - January 2008 AKARI2 @ Jeju

  27. SMC observationoverview Red: NIR,MIRS,MIRL available Cyan: NIR,MIRS available Breen: only MIRL available • Open time program • PI: Y. ITA • “Role of pulsation along the AGB” • Patchy area survey • Photometry&Spectroscopy • N3,N4,S7,S11,L15,L24 • NP,SG1,SG2 AKARI2 @ Jeju

  28. SMC spectroscopy results • Total 500 arcmin^2 • NP, SG1, SG2 spectroscopy • Detected many point-like sources with PAH features • Upper panel • DSS image with equatorial coordinate grid • Lower panel • IRAS 100um image with galactic coordinate grid AKARI2 @ Jeju

  29. SMC 0059-7230H A blue:N3 green:S7 red: S11 B D A D C E E C B AKARI2 @ Jeju

  30. SMC 0050-7250H blue:N3 green:S7 red: S11 A C D C B B A D AKARI2 @ Jeju

  31. SMC 0055-7250D blue:N3 green:S9W red: L15 A D A F E B D B E C F C AKARI2 @ Jeju

  32. SMC 0050-7310E blue:N3 green:S11 red: L15 C A C A D B D B AKARI2 @ Jeju

  33. SMC 0055-7230D blue:K green:N3 red: S9W A A B D C C B D AKARI2 @ Jeju

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