AST101 Lecture 19 Discovery of the Galaxy. Northern Milky Way.

Slides:



Advertisements
Similar presentations
Chapter 15: The Milky Way Galaxy
Advertisements

Introduction to Astrophysics Lecture 13: The Milky Way Galaxy.
Slide 1 Andromeda galaxy M31Milky Way galaxy similar to M31.
Chapter 15 The Milky Way Galaxy.
14.2 Galactic Recycling Our Goals for Learning How does our galaxy recycle gas into stars? Where do stars tend to form in our galaxy?
A105 Stars and Galaxies  Milky Way Homework (#11) due today  Projects Due Nov. 30  For next week: Units 74, 75, 76, 78, 79  “rooftop” tonight, 8 PM,
The Milky Way Galaxy Chapter 15. The Milky Way Almost everything we see in the night sky belongs to the Milky Way We see most of the Milky Way as a faint.
Lecture Outline Chapter 15: Our Galaxy © 2015 Pearson Education, Inc.
AST101 The Evolution of Galaxies. Virgo Cluster Collisions of Galaxies Outside of Clusters (the field), most galaxies are spiral or irregular In dense.
QUASARS Monsters of the ancient Universe Professor Jill Bechtold Steward Observatory Tucson Amateur Astronomers, Dec. 6, 2002.
The Milky Way PHYS390 Astrophysics Professor Lee Carkner Lecture 19.
15 The Milky Way More than just a candy bar.. 15.
The Mass of the Galaxy We can use the orbital velocity to deduce the mass of the Galaxy (interior to our orbit): v orb 2 =GM/R. This comes out about 10.
The Milky Way Galaxy 19 April 2005 AST 2010: Chapter 24.
Class 24 : Supermassive black holes Recap: What is a black hole? Case studies: M87. M106. MCG What’s at the center of the Milky Way? The demographics.
At the Center of the Galaxy!. Galaxy Centers are Mysterious and Wild Below is a picture of where the Galaxy center is with respect to the horizon (for.
Galaxies and the Foundation of Modern Cosmology III.
9B The Milky Way Our Galactic Home. 9B 9B Goals Structure of our Galaxy. Its size and shape. How do stars and things move through it? Mass and Dark Matter.
The Milky Way Center, Shape Globular cluster system
The Milky Way Galaxy Immanuel Kant (1724 – 1804) German philosopher The infinitude of creation is great enough to make a world, or a Milky Way of worlds,
The Milky Way Galaxy. The Milky Way We see a band of faint light running around the entire sky. Galileo discovered it was composed of many stars. With.
Levels of organization: Stellar Systems Stellar Clusters Galaxies Galaxy Clusters Galaxy Superclusters The Universe Everyone should know where they live:
Our Galaxy The Milky Way. The Milky Way Almost everything we see in the night sky belongs to the Milky Way We see most of the Milky Way as a faint band.
The Milky Way Our Galaxy Please press “1” to test your transmitter.
The Milky Way Galaxy Chapter 12:. The Milky Way Almost everything we see in the night sky belongs to the Milky Way. We see most of the Milky Way as a.
The Milky Way and Other Galaxies Science A-36 12/4/2007.
What’s Brewing in the Teapot? M7 M6 M8 M22 Caty Pilachowski IU Astronomy.
The Galactic Centre: a hidden treasure How can we study the Galactic centre? How can we study the Galactic centre? What is do we find there? What is do.
The Milky Way Galaxy.
Galaxies are collections of stars (between 200 billion and 400 billion) that all rotate (orbit) around a massive central point.
Multiwavelength Astronomy What do different wavelength regimes allow astronomers to “see”?
Milky Way Orbits of stars in the Milky Way Rotation curves Finding the mass from the orbit Center of the Milky Way Stars orbiting the black hole X-ray.
Susan CartwrightOur Evolving Universe1 The Milky Way n From a dark site the Milky Way can be seen as a broad band across the sky l l What is it?   telescopes.
Copyright © 2012 Pearson Education, Inc. Chapter 14 Our Galaxy.
Galactic Nucleus. Mass of the Galaxy The orbit of clusters can be used to estimate the mass of the galaxy. –Same used for planets and binary stars The.
Chapter 14 The Milky Way Galaxy What do you think? Where in the Milky Way is the solar system located? How fast is the Sun moving in the Milky Way? How.
Introduction to Galaxies 5/23/2013. BR: Milky Way Scale The Milky Way has a diameter of approximately 8.25 x 10 9 AU (8.25 billion AU). 206,265 AU = 3.26.
ASTR112 The Galaxy Lecture 7 Prof. John Hearnshaw 11. The galactic nucleus and central bulge 11.1 Infrared observations (cont.) 11.2 Radio observations.
1. Exoplanet detection (500+) 2 Gravitational attraction between a stellar mass (sun) and planets (bigger the better, why?) makes sun’s position wobble.
Chapter 19 Our Galaxy.
Lecture 39: Dark Matter review from last time: quasars first discovered in radio, but not all quasars are detected in the radio first discovered in radio,
Supermassive Black Holes Preserving a Galactic Treasure.
The Milky Way Galaxy. Sky Maps in Different Bands.
The Interstellar Medium. Red, White, and Blue : Nebulae.
UNIT 1 The Milky Way Galaxy.
The Milky Way Galaxy Comprehend the Milky Way Galaxy and the Sun’s Place In It Comprehend the Four Components of the Galaxy Comprehend Other Planetary.
AST101 Lecture 20 The Parts of the Galaxy. Shape of the Galaxy.
Copyright © 2010 Pearson Education, Inc. Clicker Questions Chapter 14 The Milky Way Galaxy.
Our Milky Way Galaxy. The Milky Way Almost everything we see in the night sky belongs to the Milky Way. We see most of the Milky Way as a faint band of.
Astronomy 1143 – Spring 2014 Lecture 21: The Evidence for Dark Matter.
Galaxies: Our Galaxy: the Milky Way. . The Structure of the Milky Way Galactic Plane Galactic Center The actual structure of our Milky Way is very hard.
Milky Way: Galactic Structure and Dynamics Milky Way has spiral structure Galactic Bulge surrounds the Center Powerful radio source Sagittarius A at Center.
AST101 Lecture 20 Our Galaxy Dissected. Shape of the Galaxy.
ASTR 113 – 003 Spring 2006 Lecture 09 March 29, 2006 Review (Ch4-5): the Foundation Galaxy (Ch 25-27) Cosmology (Ch28-29) Introduction To Modern Astronomy.
The Milky Way Galaxy This is a picture of the Sombrero Galaxy NOT The Milky Way.
The Milky Way Galaxy. What are each of these?
NOTES: The Galactocentric Perspective The Milky Way: Herschel The slab universe Kapteyn The red blood cell universe Harlow Shapley We.
Our Universe and Galaxies
News flash ALMA observes a protoplanetary disk around the young star HL Tauri. This is the first time we can DIRECTLY actually observe a planetary system.
© 2017 Pearson Education, Inc.
Lecture 30- The Structure of the Milky Way Galaxy
The matter in our Galaxy emits different kinds of radiation.
The Milky Way Our Galactic Home.
UCLA Planetarium Journey to the Center of the Milky Way
More than just a candy bar.
Galaxies.
Milky Way Orbits of stars in the Milky Way Rotation curves
Our Milky Way Galaxy.
The Milky Way Our Galactic Home.
Types of galaxies.
Presentation transcript:

AST101 Lecture 19 Discovery of the Galaxy

Northern Milky Way

Southern Milky Way

My God, it’s full of stars…

Star Counts

The Panchromatic Milky Way Different objects emit at different wavelengths For a blackbody, peak brightness is at λ ~ 1/T Other processes emit in different ways

Gamma-rays

X-rays - Hot Gas

Optical light - Stars

Near Infrared - old stars

Infrared light - Dust

21 cm (radio) - Hydrogen

Radio - Electrons

Shape of the Galaxy

You are here

About 28,000 light years from the Center of the Galaxy. Our orbital velocity is about 220 km/s. The Galactic Year is about 220 million years long. The Sun is about 21 galactic years old.

The Mass of the Galaxy A star orbiting the center of the galaxy is the same as a planet orbiting the Sun. Use Newton’s laws M=v 2 r/G But, the mass depends on radius

Rotation-Velocity Curve

Mass of the Galaxy The mass of the Galaxy is 2x10 44 gm, or solar masses. If the typical star is 1/4 solar masses, there are 4 x stars in the Galaxy

The Center of the Galaxy

Radio: mini- spiral VLA, 6 cm

X-rays Chandra

Infrared

IR K band

K band Keck AO A. Ghez UCLA

Orbits at the Center

The central object Orbits  Mass ~ 2.5 x 10 6 M  Orbits  radius < 1 AU Density > 0.4 gm/cm 3 Unseen at any wavelength A black hole

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.