763:
the bar running through the bright, round core of the galaxy. Bars are found in around two thirds of spiral galaxies, and are thought to be a natural phase in their evolution. The galaxy’s spiral arms are sprinkled with bright regions of active star formation. Each of these tiny jewels is actually several hundred light-years across and contains hundreds or thousands of newly formed stars. But NGC 4639 also conceals a dark secret in its core — a massive black hole that is consuming the surrounding gas. This is known as an active galactic nucleus (AGN), and is revealed by characteristic features in the spectrum of light from the galaxy and by X-rays produced close to the black hole as the hot gas plunges towards it. Most galaxies are thought to contain a black hole at the centre. NGC 4639 is in fact a very weak example of an AGN, demonstrating that AGNs exist over a large range of activity, from galaxies like NGC 4639 to distant quasars, where the parent galaxy is almost completely dominated by the emissions from the AGN.
43:
306:
319:
214:
325:
220:
99:
762:
NGC 4639 is a beautiful example of a type of galaxy known as a barred spiral. It lies over 70 million light-years away in the constellation of Virgo and is one of about 1500 galaxies that make up the Virgo
Cluster. In this image, taken by the NASA/ESA Hubble Space Telescope, one can clearly see
160:
The galaxy’s spiral arms are sprinkled with bright regions of active star formation. Each of these tiny jewels is actually several hundred light-years across and contains hundreds or thousands of newly formed stars. But NGC 4639 also conceals a dark secret in its core — a massive black hole that is
167:
Most galaxies are thought to contain a black hole at the centre. NGC 4639 is in fact a very weak example of an AGN, demonstrating that AGNs exist over a large range of activity, from galaxies like NGC 4639 to distant quasars, where the parent galaxy is almost completely dominated by the emissions
259:
The full image or footage credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "ESA/Hubble"). Web texts should be credited to ESA/Hubble (except when used by media). The credit should not be hidden or disassociated from the image footage.
601:
156:
In this image, taken by the NASA/ESA Hubble Space
Telescope, one can clearly see the bar running through the bright, round core of the galaxy. Bars are found in around two thirds of spiral galaxies, and are thought to be a natural phase in their evolution.
276:
If images or visuals are changed significantly from the original work (apart from resizing, cropping), we suggest that the changes are mentioned after the credit line. For example "Original image by ESA/Hubble (M. Kornmesser), warping and recolouring by
164:
This is known as an active galactic nucleus (AGN), and is revealed by characteristic features in the spectrum of light from the galaxy and by X-rays produced close to the black hole as the hot gas plunges towards it.
153:
NGC 4639 is a beautiful example of a type of galaxy known as a barred spiral. It lies over 70 million light-years away in the constellation of Virgo and is one of about 1500 galaxies that make up the Virgo
Cluster.
372:– You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
288:
Note that this general permission does not extend to the use of ESA/Hubble's logo, which shall remain protected and may not be used or reproduced without prior and individual written consent of ESA/Hubble.
273:
If an image shows an identifiable person, using that image for commercial purposes may infringe that person's right of privacy, and separate permission should be obtained from the individual.
65:
61:
57:
53:
47:
110:
78:
267:
ESA/Hubble materials may not be used to state or imply the endorsement by ESA/Hubble or any ESA/Hubble employee of a commercial product or service.
237:
and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the
244:
For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the
782:
512:
476:
703:
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
670:
460:
298:
By reproducing ESA/Hubble material, in part or in full, the user acknowledges the terms on which such use is permitted.
532:
496:
426:
706:
If the file has been modified from its original state, some details may not fully reflect the modified file.
600:
595:
69:
42:
628:
The following pages on the
English Knowledge (XXG) use this file (pages on other projects are not listed):
335:
332:
118:
230:
260:
Links should be active if the credit is online. See the usage rights Q&A section on the
305:
295:
site are not released under this license and can not be used for non-ESA/Hubble products.
245:
177:
611:
270:
ESA/Hubble requests a copy of the product sent to them to be indexed in their archive.
105:
187:
660:
234:
632:
568:
Click on a date/time to view the file as it appeared at that time.
261:
238:
810:
93:
304:
292:
229:
ESA/Hubble images, videos and web texts are released by the
218:
208:
291:
Also note that music, scientific papers and code on the
410:
Add a one-line explanation of what this file represents
235:
Creative
Commons Attribution 4.0 International license
690:
680:
650:
83:(1,280 × 1,340 pixels, file size: 407 KB, MIME type:
137:
117:
Commons is a freely licensed media file repository.
734:Creative Commons Attribution 3.0 Unported license
188:http://www.spacetelescope.org/images/potw1541a/
513:Creative Commons Attribution 4.0 International
98:
318:
213:
8:
379:https://creativecommons.org/licenses/by/4.0
355:– to copy, distribute and transmit the work
708:
570:
406:
643:The following other wikis use this file:
143:Elegant spiral hides a hungry monster.jpg
844:
836:
803:
795:
787:
777:
769:
759:
754:
745:
740:
731:
726:
718:
710:
630:
546:
530:
510:
494:
474:
458:
440:
424:
421:
402:
395:
800:uuid:D94FA4D9B33BE111A7348E72DF1589F1
748:Elegant spiral hides a hungry monster
7:
618:User created page with UploadWizard
559:
324:
219:
701:
415:
409:
346:
315:
147:
130:
76:
783:Adobe Photoshop CC 2014 (Windows)
414:
385:Creative Commons Attribution 4.0
771:Date and time of data generation
400:
366:Under the following conditions:
331:This file is licensed under the
323:
317:
212:
97:
31:
21:
397:
161:consuming the surrounding gas.
148:
14:
811:http://www.spacetelescope.org/
797:Unique ID of original document
396:
26:
1:
336:Attribution 4.0 International
36:
818:Karl-Schwarzschild-Strasse 2
422:Items portrayed in this file
866:
687:Usage on zh.wikipedia.org
677:Usage on my.wikipedia.org
667:Usage on fa.wikipedia.org
657:Usage on ca.wikipedia.org
647:Usage on ar.wikipedia.org
661:Constel·lació de la Verge
560:
178:12 October 2015, 14:00:00
16:
792:Copyright status not set
399:
104:This is a file from the
617:
239:ESA copyright statement
193:
183:
176:
173:
140:
108:. Information from its
774:14:00, 12 October 2015
596:08:24, 13 October 2015
309:
224:
111:description page there
46:Size of this preview:
823:Garching bei München
715:ESA/Hubble & NASA
308:
241:for full information.
222:
197:ESA/Hubble & NASA
70:1,280 × 1,340 pixels
805:Contact information
361:– to adapt the work
52:Other resolutions:
310:
262:ESA copyright page
225:
66:978 × 1,024 pixels
853:
852:
639:Global file usage
621:
497:copyright license
408:
314:
313:
251:
201:
200:
126:
125:
106:Wikimedia Commons
32:Global file usage
857:
831:
828:
824:
819:
813:
789:Copyright status
764:
749:
735:
709:
608:
461:copyright status
392:
389:
386:
383:
380:
344:
333:Creative Commons
327:
326:
321:
320:
248:
243:
221:
216:
215:
209:
179:
152:
144:
138:
122:
101:
100:
94:
88:
86:
73:
62:734 × 768 pixels
58:458 × 480 pixels
54:229 × 240 pixels
48:573 × 600 pixels
865:
864:
860:
859:
858:
856:
855:
854:
833:
829:
826:
822:
817:
809:
761:
747:
733:
712:Credit/Provider
697:
637:
629:
622:
614:
606:
562:
561:
558:
557:
556:
555:
554:
553:
552:
551:
549:
548:12 October 2015
539:
538:
537:
535:
524:
523:
522:
521:
520:
519:
518:
517:
515:
503:
502:
501:
499:
488:
487:
486:
485:
484:
483:
482:
481:
479:
467:
466:
465:
463:
452:
451:
450:
449:
448:
447:
446:
445:
443:
433:
432:
431:
429:
413:
412:
411:
394:
393:
390:
387:
384:
381:
378:
377:
345:
342:
339:
328:
301:
246:
207:
202:
169:
142:
135:
128:
127:
116:
115:
114:is shown below.
90:
84:
82:
75:
74:
51:
12:
11:
5:
863:
861:
851:
850:
847:
843:
842:
839:
835:
834:
815:
806:
802:
801:
798:
794:
793:
790:
786:
785:
780:
776:
775:
772:
768:
767:
766:
765:
757:
753:
752:
751:
750:
743:
739:
738:
737:
736:
729:
725:
724:
721:
717:
716:
713:
700:
696:
695:
694:
693:
685:
684:
683:
675:
674:
673:
665:
664:
663:
655:
654:
653:
641:
640:
636:
635:
627:
626:
625:
620:
619:
616:
612:
609:
605:1,280 × 1,340
603:
598:
593:
589:
588:
585:
582:
579:
576:
573:
566:
565:
550:
547:
545:
544:
543:
542:
541:
540:
536:
531:
529:
528:
527:
526:
525:
516:
511:
509:
508:
507:
506:
505:
504:
500:
495:
493:
492:
491:
490:
489:
480:
475:
473:
472:
471:
470:
469:
468:
464:
459:
457:
456:
455:
454:
453:
444:
441:
439:
438:
437:
436:
435:
434:
430:
425:
423:
420:
419:
418:
417:
416:
405:
404:
401:
398:
376:
375:
374:
373:
364:
363:
362:
356:
349:You are free:
340:
330:
329:
316:
312:
311:
302:
300:
299:
296:
289:
279:
278:
274:
271:
268:
265:
252:
226:
206:
203:
199:
198:
195:
191:
190:
185:
181:
180:
175:
171:
170:
145:
136:
134:
131:
129:
124:
123:
102:
92:
91:
45:
41:
40:
39:
34:
29:
24:
19:
13:
10:
9:
6:
4:
3:
2:
862:
848:
845:
840:
837:
832:
820:
814:
812:
807:
804:
799:
796:
791:
788:
784:
781:
779:Software used
778:
773:
770:
760:
758:
755:
746:
744:
741:
732:
730:
727:
722:
719:
714:
711:
707:
704:
698:
692:
689:
688:
686:
682:
679:
678:
676:
672:
671:انجیسی ۴۶۳۹
669:
668:
666:
662:
659:
658:
656:
652:
649:
648:
646:
645:
644:
638:
634:
631:
623:
615:
610:
604:
602:
599:
597:
594:
591:
590:
586:
583:
580:
577:
574:
572:
571:
569:
563:
534:
514:
498:
478:
462:
428:
371:
368:
367:
365:
360:
357:
354:
351:
350:
348:
347:
341:Attribution:
337:
334:
322:
307:
303:
297:
294:
293:esahubble.org
290:
287:
286:
285:
283:
275:
272:
269:
266:
264:for guidance.
263:
258:
257:
255:
249:
247:{{PD-Hubble}}
242:
240:
236:
232:
227:
217:
211:
210:
204:
196:
192:
189:
186:
182:
172:
168:from the AGN.
166:
162:
158:
151:
146:
139:
132:
120:
113:
112:
107:
103:
96:
95:
89:
80:
79:Original file
71:
67:
63:
59:
55:
49:
44:
38:
35:
33:
30:
28:
25:
23:
20:
18:
15:
821:
816:
808:
705:
702:
642:
567:
564:File history
369:
358:
352:
281:
280:
253:
228:
163:
159:
155:
149:
119:You can help
109:
77:
22:File history
846:IIM version
756:Image title
742:Short title
728:Usage terms
477:copyrighted
370:attribution
223:attribution
141:Description
723:ESA/Hubble
624:File usage
581:Dimensions
442:some value
382:CC BY 4.0
343:ESA/Hubble
254:Conditions
233:under the
85:image/jpeg
27:File usage
613:Jmencisom
578:Thumbnail
575:Date/Time
533:inception
205:Licensing
150:English:
841:NGC 4639
838:Keywords
699:Metadata
691:NGC 4639
681:NGC 4639
651:NGC 4639
633:NGC 4639
607:(407 KB)
403:Captions
359:to remix
353:to share
338:license.
37:Metadata
830:Germany
827:D-85748
592:current
587:Comment
427:depicts
407:English
133:Summary
81:
720:Source
194:Author
184:Source
282:Notes
825:, ,
584:User
391:true
388:true
277:NN".
250:tag.
174:Date
17:File
231:ESA
284::
256::
68:|
64:|
60:|
56:|
50:.
849:4
121:.
87:)
72:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
.jpg){kind=small}