CANDELS : The progenitors of red nuggets astroph/1206.5000 - - PowerPoint PPT Presentation

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CANDELS : The progenitors of red nuggets astroph/1206.5000 - - PowerPoint PPT Presentation

Sep 25, 2023 276 likes •558 views

CANDELS : The progenitors of red nuggets astroph/1206.5000 Guillermo Barro University of California Santa Cruz + CANDELS collaboration Galaxy Workshop August 2012, Santa Cruz Red nuggets: Massive, compact, quiescent, galaxies at z

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CANDELS : The progenitors of “red nuggets”

Guillermo Barro

University of California Santa Cruz + CANDELS collaboration Galaxy Workshop August 2012, Santa Cruz

astroph/1206.5000

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What makes red nuggets so important ?

✦ Abundant population of quiescent galaxies at z ≈ 2

(Universe 2--3 Gyr old) (Arnouts+07; Brammer+09,11; Williams+09; Ilbert+10; Whitaker+11)

✦ Remarkably (x5) small compared to local analogs of the

same stellar mass (Trujillo+07; Buitrago+08; Cassata+10; Saracco+10,11; Newman+12) Red nuggets:

Massive, compact, quiescent, galaxies at z≳2

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SFR ≈ Mα

  • SFGs are bigger at a given mass

The SFR-M plane

Wuyts et al. 2011

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sSFR-M and Mass-Size

  • CANDELS H-band selected catalog in GOODS-S & UDS
  • Photo-z’s (spec-z), stellar masses, (UV+IR) SFRs, GALFIT morphologies
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sSFR-M and Mass-Size Σ≈

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1.4 < z < 3.0

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Quiescent Star forming compact extended 1.4 < z < 3.0

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1.4 < z < 3.0

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1.4 < z < 3.0

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1.4 < z < 3.0

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1.4 < z < 3.0 z = 0

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1.4 < z < 3.0? quench + shrink shrink + quench

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Compact quiescent and SFGs

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Compact quiescent and SFGs

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Compact SFGs 1.4 < z < 3.0

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sersic index

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Density of compact galaxies

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Evolutionary paths to the red sequence

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Compact SFGs 1.4 < z < 3.0

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  • SFGs and quiescent galaxies follow different

Mass-Size relations

The SFR-M plane

Williams +2010

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Mass-Size relation

  • Roughly constant slope
  • Zero-point shifts towards smaller radii

Newman+2011