Resolved stellar populations in the local Volume: the impact of JWST - PowerPoint PPT Presentation

Resolved stellar populations in the local Volume: the impact of JWST Supervisors: Alessandra Aloisi Roeland van der Marel Close collaborators: Elena Sacchi , postdoc @ Space Telescope Science Institute Michele Cignoni (UniPi) Understanding the Nearby Star-forming Universe with JWST Monica Tosi (INAF – OAS) Courmayeur, August 30 th , 2019 & the LEGUS team

Resolved stellar populations in the local Volume: the impact of JWST How far we can go with HST 30 Mpc Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The effect of distance d 61 kpc 795 kpc 3.4 Mpc 18 Mpc Inner SMC (ACS) Leo A (ACS) NGC 1569 (ACS) I Zw 18 (ACS) Cignoni+2012 Cole+2007 Grocholski+2008 Aloisi+2007 Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST Why beyond the Local Group Morphological variety Environmental effects Star Formation in action NGC 1705 NGC 4449 Blue Compact Dwarf Magellanic Irregular Holmberg II Dwarf Irregular Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST Star Formation History and Color–Magnitude Diagram 0 . 0007 0 . 0007 constant SFH constant + recent burst 0 . 0006 0 . 0006 0 . 0005 0 . 0005 SFR [M � / yr] SFR [M � / yr] 0 . 0004 0 . 0004 0 . 0003 0 . 0003 0 . 0002 0 . 0002 0 . 0001 0 . 0001 0 . 0000 0 . 0000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Lookback Time [Gyr] Lookback Time [Gyr] 0 . 00008 0 . 00008 two old bursts single old burst 0 . 00007 0 . 00007 0 . 00006 0 . 00006 SFR [M � / yr] SFR [M � / yr] 0 . 00005 0 . 00005 0 . 00004 0 . 00004 Tolstoy + 2009 0 . 00003 0 . 00003 0 . 00002 0 . 00002 0 . 00001 0 . 00001 0 . 00000 0 . 00000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Lookback Time [Gyr] Lookback Time [Gyr] Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST Star Formation History and Color–Magnitude Diagram 0 . 0007 0 . 0007 constant SFH constant + recent burst 0 . 0006 0 . 0006 0 . 0005 0 . 0005 SFR [M � / yr] SFR [M � / yr] 0 . 0004 0 . 0004 0 . 0003 0 . 0003 0 . 0002 0 . 0002 0 . 0001 0 . 0001 0 . 0000 0 . 0000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Lookback Time [Gyr] Lookback Time [Gyr] 0 . 00008 0 . 00008 two old bursts single old burst 0 . 00007 0 . 00007 0 . 00006 0 . 00006 SFR [M � / yr] SFR [M � / yr] 0 . 00005 0 . 00005 0 . 00004 0 . 00004 Tolstoy + 2009 0 . 00003 0 . 00003 0 . 00002 0 . 00002 0 . 00001 0 . 00001 0 . 00000 0 . 00000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Lookback Time [Gyr] Lookback Time [Gyr] Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST Star Formation History and Color–Magnitude Diagram 0 . 0007 0 . 0007 constant SFH constant + recent burst 0 . 0006 0 . 0006 0 . 0005 0 . 0005 SFR [M � / yr] SFR [M � / yr] 0 . 0004 0 . 0004 0 . 0003 0 . 0003 0 . 0002 0 . 0002 0 . 0001 0 . 0001 0 . 0000 0 . 0000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Lookback Time [Gyr] Lookback Time [Gyr] 0 . 00008 0 . 00008 two old bursts single old burst 0 . 00007 0 . 00007 0 . 00006 0 . 00006 SFR [M � / yr] SFR [M � / yr] 0 . 00005 0 . 00005 0 . 00004 0 . 00004 Tolstoy + 2009 0 . 00003 0 . 00003 0 . 00002 0 . 00002 0 . 00001 0 . 00001 0 . 00000 0 . 00000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Lookback Time [Gyr] Lookback Time [Gyr] Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The synthetic CMD method [Tosi+1991] Observational 18 19 20 21 22 m F814W 23 24 25 26 NGC 4449 27 ¡ 1 0 1 2 3 4 5 m F555W ¡ m F814W LEGUS survey [Calzetti+2015, Sabbi+2018, Sacchi+2018] Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The synthetic CMD method [Tosi+1991] Observational Theoretical 18 1 Myr ¡ 10 5 Myr 19 10 Myr ¡ 9 20 Myr 20 50 Myr ¡ 8 100 Myr 21 ¡ 7 200 Myr 500 Myr 22 ¡ 6 1 Gyr m F814W m F814W 5 Gyr ¡ 5 23 10 Gyr ¡ 4 24 ¡ 3 25 ¡ 2 26 ¡ 1 NGC 4449 Z = 0.0015 27 0 ¡ 1 ¡ 1 0 1 2 3 4 5 0 1 2 3 4 5 m F555W ¡ m F814W m F555W ¡ m F814W LEGUS survey MESA/MIST isochrones [Calzetti+2015, Sabbi+2018, Sacchi+2018] waps.cfa.harvard.edu/MIST Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The synthetic CMD method [Tosi+1991] Observational Theoretical 18 1 Myr ¡ 10 5 Myr 19 10 Myr ¡ 9 20 Myr 20 50 Myr ¡ 8 100 Myr 21 ¡ 7 200 Myr 500 Myr 22 ¡ 6 1 Gyr m F814W m F814W 5 Gyr ¡ 5 23 10 Gyr ¡ 4 24 ¡ 3 25 ¡ 2 26 ¡ 1 NGC 4449 Z = 0.0015 27 0 ¡ 1 ¡ 1 0 1 2 3 4 5 0 1 2 3 4 5 m F555W ¡ m F814W m F555W ¡ m F814W IMF binary fraction Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The synthetic CMD method [Tosi+1991] distance Observational Theoretical 18 18 differential reddening 19 19 20 20 21 21 22 22 m F814W m F814W 23 23 24 24 25 25 26 26 NGC 4449 27 27 ¡ 1 ¡ 1 0 1 2 3 4 5 0 1 2 3 4 5 m F555W ¡ m F814W m F555W ¡ m F814W incompleteness photometric errors Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The synthetic CMD method [Tosi+1991] Observational Theoretical 18 18 Z = 0 : 0046 Z = 0 : 0015 19 19 Z = 0 : 0005 20 20 21 21 22 22 m F814W m F814W 23 23 24 24 25 25 26 26 NGC 4449 27 27 ¡ 1 ¡ 1 0 1 2 3 4 5 0 1 2 3 4 5 m F555W ¡ m F814W m F555W ¡ m F814W Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST The synthetic CMD method [Tosi+1991] Observational Theoretical 18 18 Z = 0 : 0046 Z = 0 : 0015 19 19 Z = 0 : 0005 20 20 21 21 22 22 m F814W m F814W 23 23 24 24 25 25 26 26 27 27 ¡ 1 ¡ 1 0 1 2 3 4 5 0 1 2 3 4 5 m F555W ¡ m F814W m F555W ¡ m F814W ∑ ∑ N ( i ) = w Z , t × CMD Z , t ( i ) Z t Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST Star Formation Evolution Recovery Algorithm [Cignoni+2015] INPUT parameters: • stellar tracks/isochrones • initial mass function • binary fraction • metallicity range Convolution with: • distance Monte Carlo extractions • extinction of (mass, age) pairs • photometric errors ASTs • incompleteness minimization DATA synthetic CMDs of the residuals hybrid genetic algorithm N bin o i ln o i ∑ Poissonian approach − o i + m i χ P = m i i = 1 Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST SFH derivation – all kinds of uncertainties From the data photometric depth o photometric errors o incompleteness o Poisson noise o dust obscuration o differential reddening o From the method CMD binning o SF/Z steps o assumed parameters o (e.g. IMF, binary fraction, distance, extinction law) From the models mass loss o core convective overshooting o stellar rotation o TP-AGB phase modeling o Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST SFH derivation – all kinds of uncertainties PARSEC/COLIBRI 2017 PARSEC/COLIBRI 2018 MESA/MIST 2018 -8 -8 -8 1e8 1e8 1e8 5e8 5e8 5e8 -7 -7 -7 1e9 1e9 1e9 5e9 5e9 5e9 -6 -6 -6 -5 -5 -5 F814W F814W F814W -4 -4 -4 -3 -3 -3 -2 -2 -2 -1 -1 -1 0 1 2 3 4 0 1 2 3 4 0 1 2 3 4 F555W-F814W F555W-F814W F555W-F814W 18 19 20 From the models 21 22 mass loss m F814W o 23 core convective overshooting o 24 stellar rotation o 25 TP-AGB phase modeling o 26 27 ¡ 1 0 1 2 3 4 5 m F555W ¡ m F814W Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST

Resolved stellar populations in the local Volume: the impact of JWST From HST to JWST: the gain in sensitivity HST resolution nearby surveys will be ∼ 6 times faster => + deep surveys will reach galaxies 50% further away much larger aperture Volume surveyed in 10, 100, and 1000 hours reaching 0.5 mag below the turnoff of a 12 Gyr old stellar population [Brown+2008] Elena Sacchi (esacchi@stsci.edu) Understanding the Nearby Star-forming Universe with JWST