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Morphology of galaxies at z>1.4

Morphology of galaxies at z>1.4. zCOSMOS deep v1.1 z>1.4 & flag=2,3,4,9 317 galaxies. Marseille June 10 th , 2009. high-z. low-z. Ellipticals. Spirals. Need new classification scheme 5 classes: class 1= compact

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Morphology of galaxies at z>1.4

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  1. Morphology of galaxies at z>1.4 zCOSMOS deep v1.1 z>1.4 & flag=2,3,4,9 317 galaxies Marseille June 10th, 2009

  2. high-z low-z Ellipticals Spirals Need new classification scheme 5 classes: class 1= compact class 2= dominant single extended component, symmetrical class 3= Irregular class 4= Tadpole class 5= diffuse, low SB & count number of distant components in 1 arcsec • 20 Ellipticals • Spirals • 104 Irregulars Marseille Lidia Tasca June 10th, 2009

  3. Class 1 Class 3 Class 2 Class 4 Class 5

  4. Class 3 -> dominant Number of clumps increases with class Class 1 Class 2 “Typical” galaxy has a morphology comprising 1 or more distinct clumps, with some degree of diffuse nebulosity Link between CAS classification and visually defined classes Class 3 Class 4 Class 5 Marseille Lidia Tasca June 10th, 2009

  5. I vs K morphology K-band morphology at z>1.4  not trivial (ground-based seeing-limited) ~50% of star-forming galaxies at z>1.4 are not detected in K Interesting: blue compact galaxies at z>1.4 Marseille Lidia Tasca June 10th, 2009

  6. IRCAM Ks HST-ACS F814W Class 1 Class 2 Class 3 Class 4 Class 5 High-z galaxies have irregular morphologies not only in the rest-UV but at rest-optical l as well  both l regimes are dominated by emission from young starbursting components.  Maybe fundamental differences between high and low z galaxies

  7. Spectral vs. morphological properties • Literature: galaxies at z~2-3 have irregular morphologies • Is there a connection between rest-UV morphology and the content in star, dust, gas at these epochs? • Can we connect these galaxies with lower z population? • When did early and late type differentiate? • Do we see more mergers? Marseille Lidia Tasca June 10th, 2009

  8. Spectral properties vs. visual class Marseille Lidia Tasca June 10th, 2009

  9. Conclusions & Perspectives • Visual classification complementary from CAS classification • Lya properties weakly linked to morphology classification • UV morphology decoupled from physical observables, or physical processes too complex for a simple link ? • Complete spectral classification based on Lya and UV continuum • Continue exploration of parameter space, use morphological and spectral features to classify (ie. gini and Lya: linear trend of increasing emission strength with increasing nucleation) Marseille Lidia Tasca June 10th, 2009

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