25 Years of Globular Clusters with HST

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Presentation transcript:

25 Years of Globular Clusters with HST Hubble Science Briefing Jay Anderson STScI March 4, 2015

Plan (1) Globular Clusters before HST (2) Globular Clusters with HST (3) Globular Clusters with 25 years of HST

Globular Clusters “Textbook” simple stellar populations Perfect fossil Formed stars early Single cloud, single metallicity, single age Not large enough to self-enrich Continue orbiting in spheroid of Galaxy Perfect fossil laboratories to evaluate stellar evolution GC GC GC GC GC NGC4013(NOAO)

Central Field project-nightflight.net ω Centauri Early Release Field

http://hubblesite.org/newscenter/archive/releases/2010/28/

What Astronomers see… 3) Red Giant Branch 4) Horizontal Branch 5) White Dwarf Sequence 1) Main Sequence 2) SubGiant Branch http://hubblesite.org/newscenter/archive/releases/2010/28/

Easy to identify stars… RGB HB SGB BSs MSTO WDs Red Dwarfs

Stellar Populations “Isochrone” One line means: same age Red Giant Branch C More metals One line means: same age same metallicity same distance  same small cloud Age B A “test of good photometry” More Helium

Omega N6397 47T Omega Cen NGC6397 47 Tuc Extra sequences

Plan (1) Globular Clusters before HST (2) Globular Clusters with HST (3) Globular Clusters with 25 years of HST

Globular Cluster or Dwarf Spheroidal? Cambridge, UK 2001 Globular Cluster or Dwarf Spheroidal?

Stellar Populations Similar to galaxies… Inversion! Red Giant Branch metal poor intermediate metal rich More metals Age More metals Inversion! More Helium Similar to galaxies…

Is Omega Cen a GC? OmCen Could the textbook globular cluster not be one? ® 47Tuc N2808 N6388 N6656

Is Omega Cen a globular? Are there any globular clusters? Questions to answer: How does the enrichment happen? Why are they all so different? What connection is there between clusters and galaxies? 4) Any relevance for star formation going on today? NGC6652 NGC2808

Plan (1) Globular Clusters before HST (2) Globular Clusters with HST (3) Globular Clusters with 25 years of HST

GCs with Hubble Over Time Set up new experiments Probe deeper Probe more broadly Use new detectors Better sensitivity, resolution Better filter sets Things move!

ω Centauri Anderson et al 2002 Bellini 2014 (WFC3/UVIS) Initial 2-seq Discovery on Main Sequence (WF/PC2) Bellini 2014 (WFC3/UVIS) Latest results all over the diagram! 10 Seqs!

NGC2808 Bellini et al in prep (WFC3/UVIS) D’Antona 2005 (ACS) Initial Discovery

Motions in ω Centauri 2002 ACS H-alpha

Motions in ω Centauri 2015 WFC3/UVIS F606W

MOTIONS OVER 13 YEARS Motions in ω Centauri 2015 WFC3/UVIS F606W

Proper Motions Important Qs Formation hints Are GCs just little galaxies? Do they have medium-sized BHs? How did the big BHs form in big galaxies?

Plan (1) Globular Clusters before HST (2) Globular Clusters with HST (3) Globular Clusters with 25 years of HST (4) Globular Clusters in the next 25 years..