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Topic: Whirlpool Galaxy

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	Whirlpool Galaxy
		The Whirlpool Galaxy is a galaxy which is located in the constellation Canes Venatici.
		The Whirlpool Galaxy is located at 13 29.9 right ascension and 47 12 declination.
		This Galaxy has an apparent angular size of 11 x 7 and a visual brightness of 8.4.
	www.absoluteastronomy.com /galaxies/whirlpool.htm (72 words)

	Out of this whirl: The Whirlpool Galaxy (M51) and companion galaxy
		The galaxy is nicknamed the Whirlpool because of its swirling structure.
		Some astronomers believe that the Whirlpool's arms are so prominent because of the effects of a close encounter with NGC 5195, the small, yellowish galaxy at the outermost tip of one of the Whirlpool's arms.
		The Whirlpool is one of astronomy's galactic darlings.
	www.spacetelescope.org /images/html/heic0506a.html (459 words)

	Whirlpool Galaxy (M51, NGC 5194)
		A large, bright spiral galaxy in the constellation Canes Venatici that is interacting with a much smaller neighbor, NGC 5195.
		The main galaxy was discovered by Charles Messier in 1773, the companion by Pierre Méchain in 1781.
		M51 is the first galaxy in which spiral structure was discovered, by Lord Rosse in 1845.
	www.daviddarling.info /encyclopedia/W/Whirlpool_Galaxy.html (180 words)

	Multiwavelength Messier 51 - The Whirlpool Galaxy
		The "Whirlpool Galaxy" (Messier 51) is a splendid example of a face-on spiral galaxy gravitationally interacting with a smaller companion galaxy.
		The spectacular spiral galaxy is also commonly known as NGC 5194, and the smaller companion as NGC 5195, and both are found in the constellation of Canes Venatici.
		The companion galaxy, which is classified as an irregular galaxy, lacks the well-defined structure of a spiral galaxy and appears "attached" to the end of a spiral arm in the "Whirlpool Galaxy".
	coolcosmos.ipac.caltech.edu /cosmic_classroom/multiwavelength_astronomy/multiwavelength_museum/m51.html (682 words)

	Images: Whirlpool Galaxy (Site not responding. Last check: 2007-10-19)
		As the galaxy core is at least ten times brighter than the brighter portions of the spiral arms, the grayscale levels of a computer monitor is unable to show the full range of intensities adequately.
		The spiral structure is a wave propagating through the disk that is particularly prominent due to the narrow dust lanes and the luminous, short-lived stars that outline the arms.
		The galaxy core has celestial coordinates 13h29m53s, +47d11'48" (epoch 2000), which is 3.6 degrees southwest of Alkaid, the star at the end of the handle of the Big Dipper.
	www.calvin.edu /~lmolnar/calobs/whirl.html (445 words)

	Whirlpool Galaxy (M51)
		Buried in Canes Venatici is one of the most recognizable galaxies in the sky.
		Apart from being an astronomical gem, Messier 51 is historically significant — in 1845 it was the first galaxy to be recognized as having a spiral form.
		This image of the Whirlpool and its small companion, NGC 5195, was acquired by amateur astrophotographers Tony and Daphne Hallas using a 14 ½-inch reflector, a CCD camera, and more than six hours of exposure time.
	www.shopatsky.com /browseproducts/Whirlpool-Galaxy-(M51).html (582 words)

	M51 - Whirlpool Galaxy
		M51, the 'Whirlpool Galaxy' in Canes Venatici is famous for its beautiful spiral structure, first noted by Lord Rosse in 1845.
		Its companion galaxy, NGC 5195, (seen below M51 in this image) was discovered in 1781 by Messier's colleague, P. Mechain.
		The M51 system is a spectacular example of interacting galaxies - in this case NGC 5195 is being "ripped apart" by the huge gravitational disturbance of M51, while M51 has in turn undergone huge structural alteration from the gravitational effects of NGC 5195.
	www.astrocruise.com /m51.htm (251 words)

	Astronomy News
		M51 is a spiral galaxy of type Sc and is the dominant member of a whole group of galaxies.
		However, from the new Hubble image and a January 2005 image Hubble had taken of the Whirlpool Galaxy, UC Berkeley research astronomer Weidong Li and Filippenko have pinpointed the location of the progenitor star and identified it as a red supergiant whose mass was about 7 - 10 times that of the sun.
		Distance to the Whirlpool Galaxy (M51, NGC 5194) is estimated using published photometry and spectroscopy of the Type II-P supernova SN 2005cs.
	www.activeboard.com /forum.spark?forumID=58381&subForumID=150692&action=viewTopic&commentID=3402906 (1146 words)

	Universe Today - Gas Clouds in the Whirlpool Galaxy
		Astronomers studying gas clouds in the famous Whirlpool Galaxy have found important clues supporting a theory that seeks to explain how the spectacular spiral arms of galaxies can persist for billions of years.
		The density-wave theory, proposed by Frank Shu and C.C. Lin in 1964, says that a galaxy's spiral pattern is a wave of higher density, or compression, that revolves around the galaxy at a speed different from that of the galaxy's gas and stars.
		The Whirlpool Galaxy was discovered by the French comet-hunter Charles Messier on October 13, 1773.
	www.universetoday.com /am/publish/gas_clouds_whirlpool_galaxy.html?762004 (820 words)

	Image ssc2004-19a
		NASA's Spitzer Space Telescope has captured these infrared images of the "Whirlpool Galaxy," revealing strange structures bridging the gaps between the dust-rich spiral arms, and tracing the dust, gas and stellar populations in both the bright spiral galaxy and its companion.
		The spectacular whirlpool structure and star formation in M51 are thought to be triggered by an ongoing collision with its companion.
		The Whirlpool galaxy is a favorite target for amateur and professional astronomers, alike, and was the first light target for the Infrared Space Observatory.
	www.spitzer.caltech.edu /Media/releases/ssc2004-19/ssc2004-19a.shtml (713 words)

	M-51, the Whirlpool Galaxy
		M-51(NGC 5194), the famous "Whirlpool Galaxy", is found South West from Eta Ursa Majoris, the end star of the Big Dipper's handle.
		M-51 is one of the nearest and brightest of the galaxies, and the one which shows the best-defined spiral structure.
		Satellite galaxy NGC 5195 may be attached to the north end of a M-51 spiral arm.
	www.kopernik.org /images/archive/m51.htm (601 words)

	Messier Object 51
		The famous Whirlpool galaxy M51 was one of Charles Messier's original discoveries: He discovered it on October 13, 1773, when observing a comet, and described it as a "very faint nebula, without stars" which is difficult to see.
		This galaxy was the first one where the spiral structure was discovered, in spring 1845 by Lord Rosse, who made a very careful and acurate painting.
		On June 27, 2005, German amateur Wolfgang Kloehr found SN 2005cs 15"W and 67.3"S of the nucleus of M51 as it was at mag 13.5 (and rising) - this supernova was found to be of type II by the analysis of its spectrum.
	www.seds.org /messier/m/m051.html (625 words)

	Universe Today - Astrophoto: The Whirlpool Galaxy by Robert Gendler
		Placed within the northern constellation of Canes Venatici, this pair of entwined galaxies, 60 million light years distant, is one of nighttime's most mesmerizing icons and a favorite target for sky gazers with binoculars or small telescopes.
		The intense spiral arms of the larger galaxy are the result of its proximity to the smaller, more distant associate.
		This exceptional picture of The Whirlpool Nebula was the result of an epic 42-hour exposure by Robert Gendler.
	www.universetoday.com /am/publish/m51_052106.html?2252006 (577 words)

	Whirlpool Galaxy (Site not responding. Last check: 2007-10-19)
		The Whirlpool galaxy, M51, has been one of the most photogenic galaxies in amateur and professional astronomy.
		M51, also known as NGC 5194, is having a close encounter with a nearby companion galaxy, NGC 5195, just off the right edge of this image.
		The companion's gravitational pull is triggering star formation in the main galaxy, as seen in brilliant detail by numerous, luminous clusters of young and energetic stars.
	www.wolaver.org /Space/whirlpool.htm (314 words)

	ESA - Space Science - Space sensations - Whirlpool Galaxy (M51)
		A detailed view of the Whirlpool galaxy's spiral arms and dust clouds, which are the birth sites of massive and luminous stars.
		Astronomers speculate that M51's spiral structure is primarily due to its gravitational interaction with a smaller, nearby companion galaxy, NGC 5195, just off the top of this image.
		The companion's gravitational influence is triggering star formation in the Whirlpool, as seen by the numerous clusters of bright young stars, highlighted in red.
	www.esa.int /esaSC/SEMQEW2PGQD_sensations_0.html (141 words)

	M51 - The Whirlpool Galaxy
		The Whirlpool Galaxy Galaxy in the constellation Canes Vanaciti is an Sc-type spiral galaxy with a companion galaxy NGC 5195.
		It was the first galaxy in which spiral structure was noted as Lord Rosse accurately painted it in 1845.
		This image is cropped from a 29-minute exposure at the prime focus of a 16" f/4.5 Newtonian using hypered Fuji Super HG400 film taken on 29 September 1995.
	www.astroimages.org /astrophotos/m51-8-9.html (106 words)

	BBC NEWS \| Science/Nature \| Into the heart of the Whirlpool galaxy
		Without doubt the Whirlpool galaxy is one of the most photogenic galaxies in the sky.
		This Hst image, a composite of several observations, shows starlight as well as light from glowing hydrogen, which is associated with the brightest young stars in the spiral arms.
		The galaxy's massive core, the bright ball of light in the centre of the image, is about 80 light-years across (a light-year is 9.6 million million km or six million million miles) and has a brightness of about 100 million Suns.
	news.bbc.co.uk /1/hi/sci/tech/1263664.stm (456 words)

	Chandra :: Photo Album :: Whirlpool Galaxy (M51) :: More Images of Whirlpool Galaxy (M51)
		The blast wave from the supernova explosion is interacting with the surrounding circumstellar medium giving X-ray emission which is still visible, thanks to the high sensitivity of Chandra, seven years after the explosion.
		Extending to the north and south of the bright nucleus are clouds of multimilliondegree gas.
		The similarity of these features with ones observed at radio wavelengths suggests that the gas is heated by high-velocity jets produced near a supermassive fl hole in the nucleus of the galaxy.
	chandra.harvard.edu /photo/2002/0158/more.html (226 words)

	ESA Science & Technology: The Whirlpool Galaxy (M51) and companion galaxy NGC 5195 (Site not responding. Last check: 2007-10-19)
		The Whirlpool Galaxy (M51) and companion galaxy NGC 5195
		This sharpest-ever image of the galaxy M51 (NGC 5194), taken in January 2005 with the Advanced Camera for Surveys aboard the NASA/ESA Hubble Space Telescope, illustrates a spiral galaxy's grand design, from its curving spiral arms, where young stars reside, to its yellowish central core, a home of older stars.
		The Whirlpool galaxy is located 31 million light-years away in the constellation Canes Venatici (the Hunting Dogs), the Whirlpool's beautiful face-on view and closeness to Earth allow astronomers to study a classic spiral galaxy's structure and star-forming processes.
	hubble.esa.int /science-e/www/object/index.cfm?fobjectid=37004 (414 words)

	Whirlpool Galaxy
		The Whirlpool Galaxy (which is also known as M 51 or NGC 5194) is a nearly face on spiral galaxy some 31 million light years distant toward the constellation Canis Venatici.
		The Whirlpool Galaxy is undergoing a collision with the nearby companion galaxy NGC 5195, which is located just beyond the top of the image.
		This collision is triggering an incredible burst of star formation, which is evident in the many clusters of stars that dot the spiral arm structures.
	www.astrographics.com /cgi-bin/affiliates/clickthru.cgi/getscience/www.astrographics.com/GalleryPrintsIndex/GP0051.html (237 words)

	M51 - The Whirlpool Galaxy (Site not responding. Last check: 2007-10-19)
		The Whirlpool Galaxy Galaxy in the constellation Canes Venatici is an Sc-type spiral galaxy with a companion galaxy NGC 5195.
		More information about this galaxy can be found at The Messier Index - M51.
		This image was captured on 15 June 1997 and is a composite of 29 ten-second exposures.
	members.aol.com /ccdastronomy/m51.html (78 words)

	Chandra :: Photo Album :: Whirlpool Galaxy (M51) :: 02 Jul 02
		Chandra's image highlights the energetic central regions of the two interacting galaxies, NGC 5194 (center) and its smaller companion (upper left) NGC 5195, that are collectively called the Whirlpool Galaxy.
		Extending to the north and south of the bright nucleus are clouds of multimillion-degree gas, with diameters of about 1500 light years and 500 light years, respectively.
		On the lower left of the inset image is a faint source identified with a supernova discovered in 1994 by amateur astronomers in Georgia, and subsequently determined to be an unusual Type Ic supernova.
	chandra.harvard.edu /photo/2002/0158/index.html (404 words)

	Whirlpool Galaxy
		The Whirlpool galaxy is the most photographed galaxy by amateur and professional astronomers and can be viewed by small and large telescopes.
		The galaxy has been studied in a range of wavelengths.
		The matter and antimatter fl holes in the center of the galaxy are the birth sites of massive luminous stars.
	www.matter-antimatter.com /whirlpool_galaxy.htm (206 words)

	Hubble camera captures heart of whirlpool galaxy (Site not responding. Last check: 2007-10-19)
		Scientists are seeing unprecedented detail of the spiral arms and dust clouds in the nearby Whirlpool galaxy, thanks to a new Hubble Space Telescope image, available at http://www.jpl.nasa.gov/pictures/wfpc/wfpc.html.
		The Whirlpool galaxy is one of the most photogenic galaxies.
		The galaxy is having a close encounter with a nearby companion galaxy, NGC 5195, just off the upper edge of the image.
	www.jpl.nasa.gov /releases/2001/whirl.html (334 words)

	M-51 (The Whirlpool Galaxy)
		This celebrated interacting galaxy is 37 million light years away in the constellation Canes Venatici, near the Big Dipper.
		It is actually a pair of interacting galaxies viewed nearly face on.
		A lower-angle study is the subject of the Kim Poor print Starcatcher.
	www.novaspace.com /POSTERS/PHOTO/Hubble/M-51.html (60 words)

	HubbleSite - NewsCenter - Hubble Reveals the Heart of the Whirlpool Galaxy (04/05/2001) - Introduction
		New pictures from the Hubble telescope are giving astronomers a detailed view of the Whirlpool galaxy's spiral arms and dust clouds, which are the birth sites of massive and luminous stars.
		This galaxy, also called M51 or NGC 5194, is having a close encounter with a nearby companion galaxy, NGC 5195, just off the upper edge of this image.
		The new image also reveals a dust disk in the center of the galaxy, which may feed a fl hole.
	hubblesite.org /newscenter/archive/2001/10 (225 words)

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