Lecture16 - AstroNova Arthur C. Clarke 1917 2008 prolific...

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AstroNova Arthur C. Clarke 1917 – 2008 prolific science fiction writer technology visionary Naked-eye visible gamma ray burst March 19, 2:13 am EDT distance 7.5 billion light years (!) brightest object ever observed
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Make-Up Midterm Exam Open only to those with excused absences prior arrangement with faculty or Dean’s notes required Wednesday, March 26, 5:30 – 6:50 pm SEC 206 (Busch Campus) Covers the same material as the regular midterm exam
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Previous Lecture We live in the Milky Way galaxy Herschel: first attempt to measure using star counts assumed a uniform stellar luminosity Kapteyn: adder stellar luminosity function to analysis did not know about dust absorption MW structure thin disk, ~50 Kpc diameter, ~200 pc thick spheroidal bulge, ~6 Kpc diameter spherical halo ~60 Kpc diameter
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Homework Question CQ 22.12 What was the principal reason that the measurements of Herschel and Kapteyn didn’t reveal the correct shape and size of the Galaxy? Herschel: He assumed all stars had the same luminosity Kapteyn: He was unaware of the absorption by dust in the ISM
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Quiz Question #1 Suppose an observer on a hypothetical planet maps the distribution of globular star clusters, and finds them evenly distributed throughout all parts of the sky. Where is this observer’s planet? A. orbiting our Sun B. outside our Galaxy C. in the center of the Galaxy D. in the Galaxy’s halo E. in the disk of the Galaxy, but on the opposite side of the Galactic center from the Sun
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Two components: gas and dust About 10% of Galaxy’s total mass
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Lecture16 - AstroNova Arthur C. Clarke 1917 2008 prolific...

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