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Ly- alpha morphology-density r elation @ high-z

Ly- alpha morphology-density r elation @ high-z. Y uichi Matsuda ( NAOJ ) 松田 有一 （国立天文台 ）. Summary. Subaru / S- Cam survey shows a hint of Ly- alpha morphology-density relation at high-z . Current observations are limited to extremely bright Ly-alpha blobs.

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Ly- alpha morphology-density r elation @ high-z

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  1. Ly-alpha morphology-density relation @ high-z Yuichi Matsuda (NAOJ) 松田 有一（国立天文台）

  2. Summary • Subaru / S-Cam survey shows a hint of Ly-alpha morphology-density relation at high-z. • Current observations are limited to extremely bright Ly-alpha blobs. • TMT will be able to study the morphology of the circum galactic medium of more normal galaxies at high-z.

  3. Ly-alpha imaging of the CGM • Lya imaging is a promising way to see the 2D morphology of the gaseous structure around high-z galaxies (Chris Martin’s talk). Dekel et al. (2009), van de Voort et al. (2011)

  4. Subaru / S-Cam Lya Survey at z=3 • 2.4 sq deg deep Lya imaging survey (Yamada+12) • 12 pointings (SSA22 + 6 surrounding fields, Subaru Deep Field, GOODS-N, Subaru-XMM Deep Survey Fields) • 1-sigma Lya surface brightness~10-18 erg s-1 cm-2 arcsec-2 • 2200 Lyaemitters (Yamada+12) • 14 giant (>100kpc) Lyanebulae (Matsuda+11) Subaru Telescope + Suprime-Cam + Narrow-band filter 8.2 m 27’ x 34’ 21 x 17 cm R ~ 80 http://www.naoj.org/

  5. Subaru / S-Cam Lya Survey at z=3 • 2.4 sq deg deep Lya imaging survey (Yamada+12) • 12 pointings (SSA22 + 6 surrounding fields, Subaru Deep Field, GOODS-N, Subaru-XMM Deep Survey Fields) • 1-sigma Lya surface brightness~10-18 erg s-1 cm-2 arcsec-2 • 2200 Lyaemitters (Yamada+12) • 14 giant (>100kpc) Lyablobs (Matsuda+11) 300 kpc

  6. Filamentary & Spherical Lya blobs S F F F S S F F F F F S S F 300 kpc Filamentary Spherical The areas of blobs are measured above a threshold of 1.4x10-18 erg/s/cm2/arcsec2. The circles have diameters of the major axis of the Lyablobs. N 20 25 30 35 40 45 50 55 (%)

  7. Subaru / S-Cam Lya Survey at z=3 Covering Factor ~60% Simulation Observation Spherical? 200kpc 200kpc Faucher-Giguere+11 Matsuda+11

  8. Subaru / S-Cam Lya Survey at z=3 Covering Factor ~20% Simulation Observation Filamentary? 200kpc 200kpc Faucher-Giguere+11 Matsuda+11

  9. Subaru / S-Cam Lya Survey at z=3 • 2.4 sq deg deep Lya imaging survey (Yamada+12) • 12 pointings (SSA22 + 6 surrounding fields, Subaru Deep Field, GOODS-N, Subaru-XMM Deep Survey Fields) • 1-sigma Lya surface brightness~10-18 erg s-1 cm-2 arcsec-2 • 2200 Lyman-alpha emitters (Yamada+12) • 14 giant (>100kpc) Lyman-alpha nebulae (Matsuda+11)

  10. Lya Morphology Density Relation? Field Protocluster Fraction Surface Over Density of Lya Emitters (<5 Mpc)

  11. Local Morphology Density Relation Dressler 80 S + Irr Fraction E + S0 Field Cluster Surface Density of galaxies

  12. Lya Morphology Density Relation? • Filamentary Lyablobsmay relate to disc galaxy formation via cold streams in the field. • Spherical Lya blobs may relate elliptical galaxy formation in hot haloes in proto-cluster. Fraction Over Density

  13. Lya Morphology Density Relation? • Current observations are limited to extremely bright Lyablobs (only 14 sources!!). • It is difficult to study the Lya morphologies of fainter normal galaxies individually. Fraction Over Density

  14. Stacking analysis of 2200 LAEs 20” 150kpc High Low LAE surface density (5 Mpc/h smoothing)

  15. The Lya radial profile of the field LAEs has a steeper slope. Do the field LAEs (and LBGs) also have filamentary CGM structure? If so, TMT will be able to detect the Lya emitting filaments around LAEs and LBGs. 8m 10hrs 30m 10hrs

  16. Summary • Subaru / S-Cam survey shows a hint of Ly-alpha morphology-density relation at high-z. • Current observations are limited to extremely bright Lya sources. • TMT will be able to study the morphology of the circum galactic medium of more normal galaxies at high-z.

  17. Conclusion • Ly-alpha imaging is a promising way to study gaseous structure around high-z galaxies. • Subaru / S-Cam survey shows a hint of Ly-alpha morphology-density relation at high-zbut the survey is limited to extreme cases. • TMT will be able to observe the gaseous structure around more normal galaxies.

  18. Summary • Subaru / Suprime-Cam survey at z=3 shows a hint of Lyman-alpha morphology density relation. • Filamentary Lya nebulae are found in the field, while spherical nebulae are dominant in overdense regions. • Filamentary nebulae may relate to disc formation via cold streams in the field while the spherical nebulae may relate to spheroid formation in hot haloes in the proto-cluster.

  19. All UV-continuum selected galaxies at z=2-3 have diffuse extended Lya halos Steidel+11 20” 150kpc Lya Current survey threshold But the data are from galaxy over-densities Radial profile of stacked Lya image of 92 LBGs at z=2-3 Surface brightness threshold ~10-19 erg s-1 cm-2 arcsec-2

  20. What determines Lya spatial extent? Study Lya halos using 2128 LAEs at z=3.1 as a function of environment and UV luminosity (Matsuda+12) LAE surface density (5 Mpc/h smoothing) Low High Bright Faint Central UV Luminosity

  21. Future Subaru HSC Survey • Hyper Suprime-Cam (1.5 deg diameter) • Subaru Strategic Program (300 nts in 5yrs) • Survey starts from Spring 2014 • Including Deep z=2-7 Lya imaging in ~30 sqdeg • http://www.naoj.org/Projects/HSC/surveyplan.html Subaru Telescope + Hyper Suprime-Cam + Narrow-band filter 8.2 m 90 arcmin diameter 60 cm diameter

  22. Exponentialfitting

  23. 20” 150kpc BrightFaint Central UV luminosity

  24. Exponentialfitting Exponential scale length Low High LAE surface density (5 Mpc/h smoothing) FaintBright Central UV luminosity

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