high energy astronomy observatory

8/8/2019 High Energy Astronomy Observatory

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HIGH ENERGY-


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ing likewe know.. - .a ''crab.'w this obI. . . and eneI million!. '3 Juiy , 1051. Chineseurt astrmornem re-~rted wing a "guest ject as tne u ra6 ~e 6u i a ce.wnlie tts necrrr" in the constellation t!le remains of a giant nents collapse inm. t remained bril- star that exploded more se core. For a feimt for si x months and. than 5.000 years ago. S. or ew n severaMost :he uni- ~t hs ,h e star-now

wrm a rkably wn as a supernova-constar iianally 1 britliantly, brigh-/d ecrrs Imer, rne a n old, masswe re r perhaps than all "-French comet huntt reaches a stage other stars in its galharles Messier. re nuclear fuel ha! combined. t may evnearly depleted and the seen n the daylight.delicate balance betw Eventually, the glowinternal pressure and th e supernova fadesgravity holding the st gas and dust of the :1845. observed ti toaether cr m no lonu outer lavers continur

LordR o srheCrabse's draaNebula.ngrtlic pcs of mile.. . nti- Is into I Iin material a s tioutwurd.The remnantsbt ua=-pernova consist texpanding cosmia blast wave of ethat expandswitn xr , unathe compact remains ofthe former star a t its coreSomet imes t h ~ sore isdetected as a neutronstar or pulsar-that is , arapidly spinning objectwhose macmetic field isI

3 of threllld be se.ight. Nm. . Lstars inre remat~ t . cat

- -

morknos h i ~.-->I this.cdebrismergyL 2. --I!starwhen it

s been. .of.Thestar's

s *A1 b Jtrangeled itrudge, dape, ancrew its sf describ mainta:i d . -e star suspew in!d- expg I pic!and hroting up cugh spa#>the1 nte so stronscan esca diationalongI that rairpe only

A wew or me ~ r a ofa in vls~blerghtnt oblect ar the ccs been ~denit!iedIsar and 1s thougalns of Ir , zild hr

ved as aan vrsible Ilghf, rudkWC

.a . .-teJSpulsar

the remigrnol staen c~bser. . .rves. X. crnma raj


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e X-ray i. &.


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across th e nlght sky, nfact, material in the uni-verse is clumped togetherin great, uneven masses.Our own Sun, I-pie, is but o n e ionothers bound f: Yto the Milky Way galaxy.Billions of other plax ie sar e scattered throughoutspace, and many in turnar e grouped rn greatclusters an d superclus.ters each containing mwhere from a half doze

to the deepestz visible lig1.twavelengths. in oddit ior

to charting these rnassivconglomerations--thlargest aggregate smatter known to exthe observations ar ehelping to reveal thetory of thew formation. bis still r n if th eclusters directlyfrom vn louds atan early stage of the uni-verse. or if later. alter th egalaxies themselvesformed, they were some-

,gh he srriy distx &Vera[ clusters !discovered to emit X-raysby both the Small Astron-omy Sateilite a nd theBritish X-ray satellitMore recentiy. lnstrlments on the first HEnergy Astronwmy Cser EAO 1, foundtho !rs containinga s rt elliptical'axy naa most of *hai lcry emission assad with that gala,

! econd observa

for examof a billby gravi *.

'e.u-igh>b-

contourslot knowformedst dust che X-ray

9 rrgs clusrer are stxed on a vlsrble$oto of !our ga lale same iield.

se clusteupergiar. .f the gal. X-rrsy - aten Tht

.t i -CY.tow?ral hum

le Milky $redgal4Way galax- ha:1- l C ~ Y '; bservesters at (xi X-ray:listance! hcw borgravitat2nd togeionai prcther byxesses.


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rant clusters range rcthe broad and highjvIof gal-;? fbot-andcltCLXto1central iy peaked ersrons of A 85 ( t cp / .first type, hought ttan early stage of eltion. tends to be TICspiral g a l a x ~ e sndboth X-ray imperaand velocity dispersrcThe second type is olwtth few sprais, higltemperaturesand hrg

tmped a'iessuchn) o the..

missionsas A 136smooth. .

h Inlow in,tures


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own gabned to a


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vmse, regionsof the WAO 2s X-ray teies;copewere selectedwhich found 43X - m y objects.magtrout n i th s c o r e s afray sources. These rcl

at a dark,unspedacu r umbersof previ-

fn twa such sunreys. raes of cosmic evolution.


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LWU~U I .3-2-73 * , r r r r ...-3 x !.?yf tht> pre3%7?3i*>' i 11

r tt"rz~ irrz u rra~ihrfr

a n y . The nlc-sf cl1~1.111:


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The Slvahr11word for

"off"at intervalscon-ntwzth rate ot rotatlonmost cumplere stare

A Br~tishX ra y sotei

ent even photons


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high energy astronomy observatory

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