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UW ASTR 101 - Lecture Notes

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11http://www.rc-astro.com/galaxies.php2Every fuzzy object in photograph is a galaxy, part of Perseus Galaxy Cluster.One of the closest, yet at the staggering distance of 300 million ly from Earth.The Perseus Galaxy Cluster3Hickson Compact Galaxy Group #44About 60 million light years away; located in the constellation of Leo; #44 in acatalog of 100 compiled by astronomer Paul Hickson; a range of galaxy types.4The Coma Galaxy ClusterGalaxies are often found clustered in large groups. This is one of the mostwell-known and largest of these, containing over 1,000 individual galaxies.25Galaxy Cluster Abell 194Abell 194 is a cluster of galaxies in the constellation of Cetus. It consists ofover 100 members at a distance of approximately 265 million light years.6The Hercules Galaxy ClusterAmong the myriad members of the Hercules Galaxy cluster, many areinvolved in intricate and chaotic dances with nearby companions.7Describe the Hubble “tuning fork” and summarizeits use today.State the basic differences between elliptical andspiral galaxies in how they look at visiblewavelengthsOutline the general differences in kinds of starsdominating each type, the presence of gas anddust, and the presence or absence of starformationBe able to classify galaxies based upon theirmorphologyTodayToday’’s goals:s goals:8Hubble tuning forkHubble tuning forkDescribe the Hubble “tuning fork” and summarize its use today.39Elliptical Elliptical galaxies Spiral galaxiesgalaxies Spiral galaxiesState the basic differences between elliptical and spiral galaxies in how they look.M89 E010Spiral galaxies: List at least 3 characteristics.Spiral galaxies: List at least 3 characteristics.11Ellipticals: List at least 3 characteristics.Ellipticals: List at least 3 characteristics.12413Options:SpiralBarred spiralEllipticalIrregularMerging14Outline the general differences in kinds of stars dominating each type, theOutline the general differences in kinds of stars dominating each type, thepresence of gas and dust, and the presence or absence of star formationpresence of gas and dust, and the presence or absence of star formation• Spirals (barred & normal) •


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UW ASTR 101 - Lecture Notes

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