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Topic: Perseus Arm

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	Constellation Perseus
		Perseus was the son of Zeus and the mortal Danaë.
		It was when Perseus was flow over the coast of Æthiopia (not present day Ethiopia) that he noticed Andromeda chained to the rocks by the sea, and not far away he could see Cetus, the sea-monster as a whale, rapidly nearing her.
		Perseus quickly turned to Cepheus, King of Æthiopia and said: "I can save your daughter from the sea-monster, but for my reward I demand Andromeda's hand in marriage, and a kingdom." Cepheus promised Perseus that he would have what he asked for, whereupon Perseus unsheathed his sword and leapt into the air to the attack.
	www.coldwater.k12.mi.us /lms/planetarium/myth/perseus.html (645 words)

	Perseus - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-21)
		PERSEUS [Perseus] in astronomy, northern constellation lying E of Cassiopeia and N of Taurus.
		Perseus contains two star clusters (NGC 869 and NGC 884) that are visible to the naked eye, as well as an open cluster (M34) that is barely visible.
		A meteor shower known as the Perseids appears to radiate from a star in Perseus; this shower can be seen every year for several nights beginning Aug. 10, after midnight.
	www.encyclopedia.com /doc/1E1-perseus3.html (282 words)

	Encyclopedia of Greek Mythology: Perseus
		Perseus had heard the version of the myth whereby these Sisters, though gray-haired from infancy and sadly lacking in the eyeball department, were as lovely as young swans.
		One version of the Perseus myth holds that the naiads he sought were special indeed, having as their domain the dark and lifeless waters of the river Styx, in the deepest Underworld.
		And so Perseus sought out Medusa's lair, surrounded as it was by the petrified remains of previous visitors, and he found the Gorgon sleeping; Yes, even though he had the good old magic arsenal, Perseus was not so foolhardy as to wake Medusa.
	www.mythweb.com /encyc/entries/perseus.html (1726 words)

	Perseus (constellation) - Wikipedia, the free encyclopedia
		Perseus (IPA: /ˈpəː(r)siəs, -sjuːs/) is a northern constellation, named after the Greek hero who slew the monster Medusa.
		Perseus' body is formed by the stars beta Persei, kappa Persei, iota Persei, alpha Persei, sigma Persei, nu Persei, and epsilon Persei.
		Perseus' right hand, phi Persei, is yanking at one of Andromeda's feet (51 Andromedae), intent on liberating her.
	en.wikipedia.org /wiki/Perseus_(constellation) (1020 words)

	TYING IT ALL TOGETHER: Visible Large Scale Galactic Structure
		Other arms are either offshoots of these major arms or discontinuous spiral segments (or in some cases alternative names for the same features or portions of larger features).
		The Local Arm is a discontinuous arm segment (or perhaps segments) lying very roughly about 3,000 ly further out in the galaxy than the main Sagittarius Arm of which it may be an offshoot(s).
		The Perseus Arm, which is three to four thousand light years broad, appears to be a spiral segment similar to the Local Arm.
	home.insightbb.com /~lasweb/lessons/milkyway.htm (3755 words)

	Perseus arm is closer than thought (December 2005) - News - PhysicsWeb
		Previous measurements of the distance from the Sun to the Perseus arm were made using two methods.
		The other "kinematic" method involves comparing the rotation speed the Sun with that of an object inside the Perseus arm, and then combining the difference between the two values with a model for the rotation of the Milky Way itself.
		The results also show that stars in the Perseus arm have unexpectedly large motions and move in ways that are beyond the simple rotation of the Milky Way around its centre.
	physicsweb.org /archive/news/9/12/8/1?rss=2.0 (465 words)

	Roaming the Deep Sky #8
		Perseus is, perhaps, my favorite constellation to roam by naked eye with its long, curving chains of stars.
		The entire stretch of the Perseus Arm from the vicinity of M52 in western Cassiopeia to the Double Cluster in Perseus is continuous.
		This gap in the Perseus Arm is where NGC1245 resides.
	home.insightbb.com /~lasweb/lessons/RDS08-NGC1245.htm (556 words)

	Milky Way Spiral Structure
		The arms of the Milky Way, at least near the solar neighborhood in our Galaxy, are typically named for the constellations where (in the direction of which) more substantial parts of them are situated.
		The next inner arm, sometimes labelled "-I", is called the Sagittarius or Sagittarius-Carina Arm, the next outer arm, labelled "+I", is the Perseus Arm.
		These arms can be traced by deepsky objects, namely diffuse nebulae, open star clusters and associatons, (type II and Ib/Ic) supernova remnants, and main sequence stars of so-called "early" (hot) spectral types.
	www.seds.org /messier/more/mw_arms.html (438 words)

	The Bradford Robotic Telescope's Introduction to Galaxies (Site not responding. Last check: 2007-10-21)
		Two other arms often mentioned are: the Norma arm- the name given to Perseus arm and the Cygnus arm when they join near the centre of the galaxy on the same side of the galaxy as our solar system, and the Orion arm on which the Sun is situated.
		The Orion arm is not a full spiral arm it sits between the Sagittarius arm and the Perseus arm on the outer part of the galaxy.
		The Spiral arms are concentrations of dust such as the above shown nebula, many young stars are produced in the nebulae in the spiral arms (Image taken by the Hubble Space Telescope).
	www.telescope.org /nuffield_21_sci/Galaxies/gal7.htm (184 words)

	[40.06] Trigonometric Parallax to W3OH in the Perseus Spiral Arm (Site not responding. Last check: 2007-10-21)
		We have used the VLBA to determine a trigonometric parallax for W3OH, a massive star forming region in the Perseus spiral arm, with an accuracy of 10 micro-arcseconds.
		This resolves a long-standing difference between kinematic distances (>4~kpc) and O-star luminosity distances (\approx2.2~kpc) to this region of the Perseus arm.
		The goals of this project are to determine the locations of spiral arms of the Galaxy and to test the spiral density wave paradigm.
	www.aas.org /publications/baas/v37n4/aas207/939.htm (224 words)

	Milky Way Plan Views
		The Local arm we inhabit is not a major arm, and may in fact branch off either the Perseus or Sagittarius arm somewhere.
		The CGPS covers Galactic longitudes of 74 to 147 degrees, where this is measured from the point of view of the Earth (naturally!), with longitude increasing counter-clockwise from the direction of the Galactic center.
		The underlying model (where the arms "glow") is a representation of ionized gas distribution traced by pulsar observations.
	www.ras.ucalgary.ca /CGPS/where/plan (936 words)

	How many spiral arms does the Milky Way have? (Site not responding. Last check: 2007-10-21)
		The Perseus Arm is the one just outward from the Sun's location in the Galaxy about 700 to 1000 parsecs from us.
		Beyond the Perseus Arm, there may be a more distant one, but the arms become less distinct in the outer galaxy zone.
		Interior to the Sagittarius-Scutum Arm, there are indications of a Centaurus- Carina Arm at a distance of about 3000 parsecs from the center.
	www.astronomycafe.net /qadir/q2233.html (340 words)

	The Universe within 5000 Light Years - The Orion Arm
		The Sun is located in the Orion Arm - a fairly minor arm compared with the Sagittarius Arm, which is located closer to the galactic centre.
		Located in the Perseus Arm of the Galaxy, the Heart and Soul Nebulae are located in a region of active star formation containing many young clusters of stars.
		The Eta Carinae nebula is a massive region of star formation in the Sagittarius arm of the Galaxy, and it surrounds the extremly massive star Eta Carinae.
	www.atlasoftheuniverse.com /5000lys.html (751 words)

	The Amalgamation
		The first report of the Amalgamation was in 8750 by an expedition from Muzzio Astrogation that explored the stars in the vicinity of the Basel 10 cluster in the Perseus Arm.
		Another theory is that the Amalgamation is an attack from advanced and isolationistic aliens somewhere in the outer Perseus arm, trying to set up a buffer of controllable slaves between them and the rest of humanity.
		The threat of the Amalgamation led to the formation of the Perseus Arm Defense Organisation in 9187, a treaty organisation of all empires and systems involved in the struggle against the Amalgamation.
	www.orionsarm.com /topics/Amalgamation.html (2183 words)

	MILKYWAY - Perseus Arm
		In that year, American astronomer William Morgan 91906-94) realized from the brightness of the stars in the constellations of Perseus, Cassiopeia, and Cepheus that they must all be at about the same distance.
		He had discovered the Perseus Arm, the outermost main spiral arm.
		The Perseus Arm is one of the Galaxy’s main arms, but instead of wrapping itself all the way around the Galaxy, it is made up of a series of unconnected patches of young stars and nebulas.
	library.thinkquest.org /C0126543/milkyperseus.htm (163 words)

	Spaceflight Now \| Breaking News \| Galaxy's neighboring spiral arm closer than thought
		Mark Reid and his colleagues measured the distance to the Perseus spiral arm and found it to be closer than believed, only 6400 light-years away.
		Previous estimates of the distance to the Perseus arm varied by a factor of two.
		Just as a finger held at arm's length appears to shift against the far wall when viewed with one eye or the other, a nearby object will appear to shift position relative to a more distant one.
	www.spaceflightnow.com /news/n0512/27spiral (1312 words)

	A Map of the Milky Way
		Note also that the Orion Arm is not a major spiral arm, but only an enhancement of stars and gas between the Sagittarius and Perseus arms.
		The reason why the arms of spiral galaxies are so prominant is that the brightest stars are found in the spiral arms.
		Spiral arms are the major regions of star formation in spiral galaxies and this is where most of the major nebulae are found.
	www.atlasoftheuniverse.com /milkyway.html (647 words)

	HMS PERSEUS aircraft carrier profile. Aircraft Carrier Database of the Fleet Air Arm Archive 1939-1945
		Perseus was built by Vickers Armstrong, Newcastle, laid down 1 June 1942, launched 26 March 1944 and named HMS Edgar.
		Perseus was subsequently stricken in the late 1950's, and broken up May 1958 at Port Glasgow.
		Perseus and Pioneer were completed as maintenance carriers without catapults.
	www.fleetairarmarchive.net /Ships/PERSEUS.html (384 words)

	Perseus - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-21)
		The resultant Third Macedonian War (171-168) began with a Macedonian cavalry victory and then dragged on indecisively.
		Finally Aemilius Paullus took command of the Roman forces and soundly defeated (168) Perseus at Pydna on the Gulf of Thessaloníki.
		Find newspaper and magazine articles plus images and maps related to "Perseus" at HighBeam.
	www.encyclopedia.com /doc/1E1-perseus2.html (202 words)

	Universe Today - Perseus Spiral Arm is Closer Than Previously Thought
		The Perseus spiral arm, the nearest spiral arm in the Milky Way outside the Sun's orbit, lies only half as far from Earth as some previous results had suggested.
		This was done by use of a vast array of radio telescopes in the USA called the Very Long Baseline Array, observing very bright spots within clouds of gas that contain methyl alcohol in the placental material surrounding a newly formed star called W3OH.
		The reason for the discrepancy is that young stars in the Perseus spiral arm have unexpectedly large motions."
	www.universetoday.com /am/publish/perseus_spiral_arms.html?15122005 (982 words)

	Amazon.com: Orion Arm: The Rampart Worlds: Book 2 (May, Julian. Rampart Worlds, Bk. 2.): Books: Julian May (Site not responding. Last check: 2007-10-21)
		Orion Arm is the second book in the Rampart Worlds Trilogy, a fun, witty, colorful space opera detective adventure set 200 years in the future.
		Orion Arm continues the Julian May tradition of creating worlds described with vibrant adjectives that make her worlds a feast for all five senses.
		Orion Arm continues in the vein of sort of goofy, tongue-in-cheek action adventure and humorous cynicism from rough-around-the-edges protagonist Asa Frost.
	www.amazon.com /Orion-Arm-Rampart-Worlds-Julian/dp/0345395190 (1316 words)

	SPACE.com -- Astronomers Measure Distance to Milky Way's Spiral Arm (Site not responding. Last check: 2007-10-21)
		Estimated locations of spiral arms are indicated by the large number of dots and labeled by a prominent constellation onto which they are projected.
		Until now scientists had difficulties figuring just how far away spiral arms are, and various measurements and techniques had discrepancies ranging by a factor of two.
		Although scientists don’t really understand the details of spiral arm formation, these observations support the “spiral density-wave theory.” This theory suggests that a combination of gravitational instabilities and shear forces—a result of the outer edge of the galaxy moving slower than the inner—cause material to cluster and eventually shoot off in an arm.
	www.space.com /scienceastronomy/051208_spiral_arm.html (649 words)

	Astromart News - Astrophysicists Determine Sun's Location in Milky Way
		Astrophysicists have determined with unprecedented accuracy that our Sun is located halfway between the Sagittarius Arm (closest to the galaxy center) and the Perseus Arm of the Milky Way Galaxy.
		The distance from the Sun to each of the spiral arms is 6400 light years.
		Astrophysicists have found that the Perseus spiral arm of the Milky Way Galaxy lies only half as far from Earth as previous studies had suggested.
	www.astromart.com /news/news.asp?news_id=416 (591 words)

	HISA Poster the 193rd Meeting of the AAS, January, 1999
		The ~2 kpc distance to the Perseus feature is based on the sightline velocity model of Roberts (1972), while the 200-500 pc distance for the Local feature is constrained merely to lie within the Local Arm, but outside the Local Bubble.
		Instead, the peak in integrated opacity suggests a substantial abundance in HISA in the Perseus Arm, in full agreement with visual impressions of the amount of HISA in different channels of the velocity cube.
		Figure 3 (Upper Left): Close-up of a HISA complex in the Perseus Arm at -41 km/s, with brightness ranging from 50-135 K. Yellow CO contours (Heyer et al.) are at 1, 3, and 5 K, and red 60 µm contours (Cao et al.) are at 15, 17, and 19 MJy/sr.
	www.naic.edu /~gibson/hisa/poster/1999 (2005 words)

	Spiral arm of Milky Way looms closer than thought - Forums powered by UBBThreads™ (Site not responding. Last check: 2007-10-21)
		Astronomers using this technique had previously estimated the distance to Perseus, the arm immediately beyond the Sun, at more than 13,000 light years.
		But other researchers arrived at half that distance using a method that compares the apparent brightness of massive, young stars with estimates of their intrinsic brightness.
		I thought the article was confusing: Last I heard our sun was bobing up and down inside a spiral arm: The diagram shows our Sun half way between the Sagitarius arm and the Perseus arm which it describes as "away from the Sun".
	uplink.space.com /showflat.php?Cat=&Board=sciastro&Number=402484&page=1&view=collapsed&sb=5&o=0&fpart= (366 words)

	[No title]
		As we zoom in we can see the Orion arm in the center, with faint hints of the Perseus arm to the left and the Sagittarius arm to the right.
		The Orion arm is at the center, extending upwards and downwards with a ~30 degree slant.
		This project was inspired by/part of the Orion's Arm project.
	www.nada.kth.se /~asa/Starmaps (586 words)

	EXPOSING THE STUFF BETWEEN STARS:
		The diffuse nebulosity that fills the Map 1 panorama from left to right is hydrogen gas, which is distributed along the mid-plane of the Galactic disk and runs across the middle of the image.
		However CGPS astronomers used the DRAO array to isolate the gas in the Perseus Arm, 6500 light-years distant, from the rest of the gas in the disk.
		A giant "spur" seen in the Perseus Arm panorama, and detailed in Map 2, is interstellar gas and dust emerging from the disk of our Milky Way Galaxy.
	www.ucalgary.ca /UofC/events/unicomm/NewsReleases/starstff.htm (885 words)

	The Anatomy of a Celestial Swan
		It is a great river of matter extending from Perseus, through Cygnus, and ending somewhere behind Scutum to form the great arc of the Perseus Arm.
		It was once thought that the Orion Spur was a separate spiral arm nestled between the Sagittarius and Perseus Arms.
		I knew I could at least distinguish from its speed whether an object was in the Perseus Arm or the Orion Spur.
	www.astronomycafe.net /anthol/w10s3.html (2304 words)

	Galaxy’s spiral arm is closer than was thought, research finds
		The nearest spiral arm of our galaxy—after the one we inhabit—is half as far off as some studies previously suggested, new research has found.
		A team of astronomers measured the distance to the so-called Perseus arm using a worldwide system of radio telescopes, known as the Very Long Baseline Array.
		The new measurements show the spiral arm is about 6,400 light years from the Earth, with a 2 percent accuracy, the astronomers said.
	www.world-science.net /othernews/othernews-nfrm/051227_perseus.htm (599 words)

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