PPT-HII Region Metallicity Distribution in the Milky Way Disk

Dana Balser NRAO Loren Anderson WVU Tom Bania BU amp Trey Wenger UVa Photo Harry Morton Key Capabilities of the GBT Receivers cover 01 to 100 GHz Excellent pointsource sensitivity. Michael Hayden (NMSU), Jo . Bovy. (IAS), Steve . Majewski. (. UVa. ), Jennifer Johnson (OSU), Gail . Zasowski. (JHU), Leo . Girardi. (. Padova. ), Carlos Allende-. Prieto. (IAC), Ana Garcia-Perez (. Michael Hayden (NMSU), Jo . Bovy. (IAS), Steve . Majewski. (. UVa. ), Jennifer Johnson (OSU), Gail . Zasowski. (JHU), Leo . Girardi. (. Padova. ), Carlos Allende-. Prieto. (IAC), Ana Garcia-Perez (. The Milky Way Galaxy. When you look into the hazy band of light across the sky, you are actually looking at our galaxy from the inside. While an awesome sight, you can only truly begin to see it if you get away from city lights on a moonless night. . William Herschel’s map of the Milky Way based on star counts. In the early 1800’s William Herschel, the man who discovered the planet Uranus, tried to understand the shape of the Milky Way by counting stars. He counted how many stars there were in each of dozens of different directions and then plotted the count versus direction. . Q: in order to study the spatial distribution of the thin disk (which dominates the Milky Way luminosity) surface photometry in the K band from space has been used. What is the advantage of the K band? What sort of stars give off most of their light at 2 microns. M51 – A typical spiral-disk galaxy. The M81 group of galaxies. M82. M81. Satellite galaxy. Satellite galaxy. M81 group showing hydrogen emission at radio wavelengths. Composite image of M 81. Blue shows X-Ray observations(high energy), pink infrared (dust). Contains more than 100 billion stars. Is one of the two largest among 40 galaxies in the Local Group. Our Solar System is located a little more than half way from the galactic center to the edge of the galactic disk.. Galaxies (part I) . T. Howard. The Galaxy – part I -- Overview. New distance unit: the . parsec. (pc).. Using Earth-orbit parallax, if a star has a . parallactic. angle of 1",. it is 1 pc away. . Lessons from the. Illustris Simulation . Shy . Genel. Hubble Fellow. Columbia University. Genel 2016, . ApJ. in press. (. arXiv:1602.02773. ). How Environment Affects Galaxy Metallicity:. Lessons from the. Here’s the mystery story we’ll unfold…. Fuzzy blobs in the sky – new solar systems, or “galaxies”?. Observational tests. Herschel’s map of the “universe” . (what we today know as just our Galaxy). The astonishing variety of galaxies derived from a few structural types. Sec 1.3. Irregulars. = misfits in any class. Edwin Hubble . The Realm of the Nebulae . (1936. ). ‘. Tuning Fork’ classification scheme of galaxies. David Spergel. What has changed?. Context:. Standard cosmological model. No galaxy is an island… (John Dunne vs. Immanuel Kant). Tools:. Statistical galactic astronomy. 100s of stars -> 100,000s -> 1e9 (GAIA +LSST). An X-ray/UV Perspective. Edmund Hodges-. Kluck. Joel . Bregman. . University of Michigan. How do baryons cycle in and out of galaxies, and how does this impact galaxy evolution?. What happened to the “missing” baryons?. at High Redshift Universe. KenTaro. Motohara . (. IoA. , . Univsersity. of Tokyo). Gas Phase . Metallicity. Gas Phase . Metallicity. (Oxygen Abundance) is crucial to understand galaxy formation/evolution, as it traces the previous star formation history. .