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Census of the Star-forming

Duilia de Mello. Some results presented are unpublished. If you need to refer to this work contact me. Don’t use it without emailing me before, please, duilia@ipanema.gsfc.nasa.gov. Census of the Star-forming. galaxies at intermediate-z. Duilia de Mello (GSFC/JHU)

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Census of the Star-forming

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  1. Duilia de Mello Some results presented are unpublished. If you need to refer to this work contact me. Don’t use it without emailing me before, please, duilia@ipanema.gsfc.nasa.gov Census of the Star-forming galaxies at intermediate-z Duilia de Mello (GSFC/JHU) Jonathan P. Gardner (GSFC) and the GOODS team

  2. | | | | 8.8 6 3.3 1.6 Gyr Duilia de Mello Cosmic Star formation history Extinction corrected LBGs Steidel et al. 1999

  3. Lyman Break Technique UV dropouts – z~2.6-3.4 [UV is detected in the optical] Steidel et al. 2004, Shapley et al. 2003, Pettini et al. 2000

  4. LBGs spectra are similar to starbursts at low-z starbursts. What are their morphologies? Are they the building blocks of larger galaxies? Need a large sample of LBGs! Deep images with high resolution. Rest-frame 1000 1200 1450 1925

  5. Great Observatories Origins Deep Survey HST ACS (B, V, i, z) Multi-epoch 2 fields South North (CDF-S HDF-N) – 316 arcmin2 0.03”/pix Spatial resolution 0.1’’ Giavalisco et al. 2004

  6. B-dropouts : LBGs at z = 4 Ravindranath et al. (2005; in preparation)

  7. | | | | 8.8 6 3.3 1.6 Gyr Duilia de Mello Cosmic Star formation history Extinction corrected LBGs Steidel et al. 1999

  8. Rest-frame UV Finding starbursts at intermediate-z • 1500 Å at z~0.5 is observed at 2250 Å • 0.8 2700 • 1.0 3000 • 1.2 3300

  9. GOODS - near-UV coverage WFPC2 1500 Å at z=1

  10. GOODS - near-UV coverage • WFPC2 (F300W) observations of GOODS/HST are shallow but cover large area. • WFPC2 (F300W) observations of the Ultra Deep Field (UDF) - Deep but cover small area.

  11. WFPC2 F300W CDF-S

  12. WFPC2 F300W HDF-N

  13. GOODS shallow U-band Magnitude_Auto (F300W)

  14. GOODS DEEP U-band 84 700 s orient 310 238 400 s orient 314 = 323 100 s GOODS UDF 278.9 ks Resolution = 0.06”/pixel

  15. GOODS DEEP U-band de Mello, Wadadekar, Casertano, Gardner 2005 (submitted)

  16. GOODS shallow U band Photometric Redshifts

  17. GOODS shallow U band

  18. SEDs Coleman et al. 80, Kinney et al. 96 Scd E Sbc Starburst Im Starburst Templates: early- to late-type Coleman et al. Starbursts Kinney et al. Dahlen et al. 2005, Mobasher et al. 2004

  19. Results – GOODS shallow U-band

  20. GOODS shallow U band E Sbc Scd Im Sb1 Sb2

  21. GOODS shallow U band E Sbc Scd Im Sb1 Sb2

  22. Gallery of starbursts with spectroscopic redshifts: Late-types, Interacting, Tidal tails, Compacts, tadpoles zphot=0.36 zphot=0.42 zphot=0.57 zphot=1.12 zphot=0.55 zphot=0.69 zphot=0.7 zphot=1.12 zphot=1.31

  23. Results – GOODS shallow U-band • 35% are starbursts (81/227 – 43 stars) • 75% of starbursts have tidal tails or peculiarities/interaction • 50% of starbursts have another galaxy within 5x5” • 36% of starbursts show tadpole morphology

  24. Blue are starbursts Circles HDF-N Triangles CDF-S Luminous blue Compact gals Blue nucleated, Compact narrow emission line, Small blue gals Bershady etal 00

  25. Blue are starbursts Circles HDF-N Triangles CDF-S Bluest are mostly Starbursts, #2 is Im

  26. Bluest Objects Compacts Tidal tails Tadpoles But...

  27. Bluest Objects Compacts Tidal tails Tadpoles But... Are we looking at the SF region shape or overall Morphology?

  28. Bluest Objects Compacts Tidal tails Tadpoles But... Are we looking at the SF region shape or overall Morphology? Is GOODS good Enough?? Depth Of ACS and WFPC2 enough??

  29. Results – GOODS deep U-band

  30. E • Sbc • Scd • Im • Starburst 1 • Starburst 2 Spectral Types SB2 SB1 E-Sa

  31. Cyan 0.2<z<0.6 Yellow 0.6<z<0.8 Green 0.8<z<1.0 Magenta 1.0<z<1.2 size Papovich et al 05 Locals: Scd/Sdm/Irr Sab/Sbc E/S0 Measured on rest-frame B band

  32. At 0.8<z<1.2 most • of objects are: • compact, LSB, • tadpoles • - Have spectral • types of starbursts • and have small • sizes rh~2kpc LBGs at z~4 <rh>~1.7kpc Ferguson et al. 2004 – measured at rest-frame UV 1200-2000Å

  33. Young clusters (Antennae) Intermediate 0.25-1Gyr Old Globulars Age 108 – 1010 yr New Starburst99 Vazquez & Leitherer 05 V-I Cyan 0.2<z<0.6 Yellow 0.6<z<0.8 Green 0.8<z<1.0 Magenta 1.0<z<1.2 B-V

  34. Summary • UV-selected galaxies at intermediate-z when seen in redder wavelenghts are: • spirals, peculiars, compact, tadpoles, lsb, and even early-types ! • Majority of them have spectral types of starbursts, have neighbors, show signs of interaction. Bluest are compact, tadpole. • At 0.8<z<1.2 most of UV-selected objects are compact, LSB, blue dots, tadpole, with small sizes rh~2kpc, and spectral types of starbursts. • When compared to clusters and models, most of the UV-selected have mixed ages ranging from 108 to 1010 yr. • Next: increase UV sample: GALEX, UDF ACS-UV

  35. The End

  36. Bluest Objects Compacts Tidal tails Tadpoles But... Are we looking at the SF region shape Or overall Morphology? Is GOODS good Enough?? Depth Of ACS and WFPC2 problem??

  37. Zphot=1.28

  38. Zphot=1.48

  39. Zphot=1.74

  40. Local Universe – multiwavelength view (K-correction) • Late-type (Sc and later) are similar in the optical and UV (star-forming regions dominate). • Early-type spirals (Sa-Sbc) tend to be classified as later-types in the UV (disk dominates). • Ellipticals retain smooth profile, but appear more compact.

  41. FUV NUV300 I874 H160 FUV NUV300 I874 H160 z 0.09 0.321 0.321 0.475 0.555 0.682 HDF-N Morphological K-correction (ACS/SBC, WFPC2, NICMOS) Teplitz et al. 2005 in preparation

  42. Comparison of Structural Parameters from GOODS and HUDF: Triangles are LBGs Blue z=3 Green z=4 Red z=5 Dots are all galaxies GOODS depth is good Enough for bright LBGs Ravindranath et al. (2005; in preparation)

  43. Results – GOODS shallow U-band • 95 objects with spectroscopy • Objects of all types (35% Starbursts) • 66% of the starbursts have tidal effects and/or close companions, but only • 33% of the other types have tidal effects

  44. Cyan 0.2<z<0.6 Yellow 0.6<z<0.8 Green 0.8<z<1.0 Magenta 1.0<z<1.2 LBGs are more luminous with MB ~ -23 ± 1 The brightest objects

  45. Cyan 0.2<z<0.6 Yellow 0.6<z<0.8 Green 0.8<z<1.0 Magenta 1.0<z<1.2 Locals: Scd/Sdm/Irr Sab/Sbc E/S0

  46. CAS in the ACS 1134 galaxies identified in the ACS field within 0.24<z<1.3 RAB<24 – Mobasher et al. 2003 65% are late-types (C=2.65, A=0.27) 21% are early-types (C=2.35, A=0.23) 14% are starbursts (C=2.53, A=0.33) UV selected galaxies are on average more asymmetric (C=2.63, A=0.35) AAS Atlanta 2004

  47. Duilia de Mello Great Observatories Origins Deep Survey Chandra=460 arcmin2

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