Ageing, quenching and rejuvenation in SDSS galaxies

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1 Ageing, quenching and rejuvenation in SDSS galaxies Javier Casado (Universidad Autónoma de Madrid) Carmen de la Victoria, Albayzin, Granada

2 What do we mean by... Ageing, quenching and rejuvenation...

3 What do we mean by... EVO Ageing, quenching and rejuvenation... LUT I ON

4 What do we mean by... EVO Ageing, quenching and rejuvenation... RED SEQUENCE LUT I ON green valley your favourite color BLUE CLOUD your favourite mass/luminosity indicator

5 What do we mean by... EVO Ageing, quenching and rejuvenation... RED SEQUENCE LUT I ON green valley your favourite color BLUE CLOUD Peng et al FAST - QUENCHING - NATURE? NURTURE? BLUE CLOUD green valley RED SEQUENCE your favourite mass/luminosity indicator

6 What do we mean by... EVO Ageing, quenching and rejuvenation... RED SEQUENCE LUT I ON green valley your favourite color BLUE CLOUD Peng et al FAST - QUENCHING - NATURE? NURTURE? BLUE CLOUD your favourite mass/luminosity indicator green valley RED SEQUENCE Schawinski et al Morphology is a KEY aspect - ET galaxies evolve fast merger nurture - LT galaxies evolve slowly? nature NO BIMODALITY

7 How did we approach EVOLUTION...

8 How did we approach EVOLUTION... Uffff mass metallicity luminosity age star-formation stellar-to-gas fraction

9 How did we approach EVOLUTION... Uffff mass metallicity luminosity age star-formation stellar-to-gas fraction We focus on the SSFR Casado et al We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color

10 How did we approach EVOLUTION... Uffff mass metallicity luminosity age star-formation stellar-to-gas fraction We focus on the SSFR Casado et al We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color

11 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

12 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

13 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

14 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

15 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

16 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

17 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 R1/R2, R5/ȓ Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

18 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 ies lax a g 0 50 ~82 R1/R2, R5/ȓ E V A ON E G A R Morphology H (EW), (u-r) color Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

19 How did we approach EVOLUTION... Uffff We focus on the SSFR Casado et al mass metallicity luminosity age star-formation stellar-to-gas fraction We use proxies accepted - arxiv: Mr, 03N2 ies lax a g 0 50 ~82 R1/R2, R5/ȓ E V A ON E G A R Morphology H (EW), (u-r) color NATURE Chemically primitive Chemically evolved Gas rich, metal poor, low mass Gas poor, metal rich, higher masses

20 What do we mean by NATURE The definition of age is something a bit odd... mass-weighted average age

21 Ha(EW) Ageing... (u-r) color

22 107 yr Ha(EW) Ageing... (u-r) color yr TWO PROXIES FOR THE SSFR BUT WITH DIFFERENT TIME SCALES

23 Ha(EW) Quenching (+ageing) (u-r) color

24 Rejuvenation Ha(EW) (+quenching + ageing) (u-r) color

25 Ha(EW) (u-r) color

26 Ha(EW) (u-r) color

27 Ha(EW) (u-r) color

28 Ha(EW) FA SL OW ER ER ST (u-r) color

29 Conclusions (on average) - nature is the main driving mechanism interactions, mergers DO HAPPEN, but are not statistically significant Casado et al accepted - arxiv:

30 - nature is the main driving mechanism interactions, mergers DO HAPPEN, but are not statistically significant - EVERYBODY AGES ageing Ha(EW) Conclusions (on average) (u-r) color Casado et al accepted - arxiv:

31 - nature is the main driving mechanism interactions, mergers DO HAPPEN, but are not statistically significant - EVERYBODY AGES ageing - Ha(EW) Conclusions (on average) quenching and rejuvenation episodes occur - if gas is conserved (more likely in the field) scatter (u-r) color Casado et al accepted - arxiv:

32 - nature is the main driving mechanism interactions, mergers DO HAPPEN, but are not statistically significant - EVERYBODY AGES ageing - quenching and rejuvenation episodes occur - if gas is conserved (more likely in the field) scatter - if gas is completely removed quenching EXCLUSIVE OF THE DENSEST ENVIRONMENTS Ha(EW) Conclusions (on average) (u-r) color Casado et al accepted - arxiv:

33 - nature is the main driving mechanism interactions, mergers DO HAPPEN, but are not statistically significant - EVERYBODY AGES ageing - - quenching and rejuvenation episodes occur - if gas is conserved (more likely in the field) scatter - if gas is completely removed quenching EXCLUSIVE OF THE DENSEST ENVIRONMENTS MORPHOLOGY AS A CONSEQUENCE RATHER THAN THE CAUSE. Ha(EW) Conclusions (on average) (u-r) color Casado et al accepted - arxiv:

34 thanks.

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