* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Studying the Metallicities of Dwarf Galaxies Myles McKay (SCSU)
Survey
Document related concepts
Nucleosynthesis wikipedia , lookup
Weakly-interacting massive particles wikipedia , lookup
Leibniz Institute for Astrophysics Potsdam wikipedia , lookup
Astrophysical X-ray source wikipedia , lookup
Dark matter wikipedia , lookup
Stellar evolution wikipedia , lookup
Gravitational lens wikipedia , lookup
White dwarf wikipedia , lookup
Weak gravitational lensing wikipedia , lookup
Cosmic distance ladder wikipedia , lookup
Transcript
Studying the Metallicities of Dwarf Galaxies Myles McKay (SCSU) Sabrina Stierwalt (NRAO) Kartik Sheth (NRAO) What is a Dwarf? NO DEFINITION! Milky Way Galaxy NGC4413 10^11 M* 10^8 M* or less . Why study dwarf galaxies? • Most numerous extragalactic population in the local universe • Maybe the building blocks of more massive galaxies • Dwarf galaxies may be analogs to gas-rich galaxies at high redshift. • Insufficient star formation(some) GALEX SDSS NUV/FUV OPTICAL . S4G INFARED . NGC4393 What affects the development? • HI Open box Scenario Closed box Scenario External Internal • • Inflow of HI gas. HI METALS Supernovae driven winds Ram-pressure stripping METALS SUPERNOVAE HI HI METALS METALS Metallicity • Metallicity (Z)- The proportion of its matter made up of chemical elements other than H and He. • Using Palomar data to measure the metallicity. Stellar-to-HI Mass Ratio (M*/M(HI) • Spitzer (S⁴G) (Kartik Sheth) • Galaxies that have lowest stellar mass • Lowest stellar/HI mass • 19 galaxy sample Stellar Mass(M*M(sun)) . Sabrina Stierwalt BACKGROUN H alpha SII • Made metallicity measurements • Used IRAF to reduce data • Measure the Halpha, OIII, and SII. SPATIAL AXIS Palomar Double Spectrograph COSMICRAYS CONTIUUM . WAVELENGTH PROCESS Battle with IRAF Fight with IDL METALLICITY BEAUTIFUL PLOT Metalicity ranges My Galaxies Favors open box scenario Other Galaxies ABSOLUTE MAGNITUDE Future Work • Locate these galaxies • Study their surroundings • Compare their environments Conclusion Low mass dwarf galaxies that have insufficient star formation are likely affected by their environment. SUMMER STUDENT AND/OR Acknowlegment THANK YOU National Radio Astronomy Observatory(NRAO) National Science Foundation(NSF) Mentors National Astronomy Consortium (NAC) Cville Cohort Questions?