Free Astronomy Magazine September-October 2026 ARABIC VERSION

A Anintermediate-mass black hole tearsapart a star byNRAO stronomers using the U.S. NationalScienceFoundation VeryLargeArray(NSFVLA) have detected an extraordinary burstofradiolightfromararecos- miceventinwhichanintermediate- mass black hole tears apart a star, revealing what appears to be the off-axisafterglowofapowerfuljet. Theevent,knownasAT2019ijn,first appeared as a bright blue flash in opticalsurveys,risingtopeakbright- nessinjustafewdaysbeforefading muchmoreslowlythansimilartran- sientsusuallydo.Whenastronomers later examined radio observations, they found something even more unusual: the radio emission kept brightening for nearly two years andreachedaluminosityfarbeyond thatseenintypicalstellarexplosions atsimilarphases,followedbyaslow decay over at least four years. The researchersconcludedthatthe most SEPTEMBER-OCTOBER2026 ﻣﺠﻠﺔ FreeAstronomy ﺎﻟﻌﺮ ﺔ 26 ﺛﻘﺐ أﺳﻮد ﻣﺘﻮﺳﻂاﻟﻜﺘﻠﺔ ﺎً ﻤﺰق ﻧ ﻤ : ﻘﻠﻢ ﻟﻌﻠﻢ اﻟﻔﻠﻚ اﻟﺮادﻳﻮي اﻟﻤﺮﺻﺪ اﻟﻮﻃ رﺻـﺪ ﻋﻠ ﻤﺎء ﻓﻠﻚ ﺑﺎﺳﺘﺨﺪام ﻣﺼـﻔﻮﻓﺔ ﻛـﺎرل ﺟﻲ ﺟﺎﻧﺴﻜﻲ اﻟﻜﺒ ة ﺟﺪ اً اﻟﺘﺎﺑﻌﺔ ﻟﻠﻤﺆﺳﺴﺔ اﻟﻮﻃﻨﻴﺔ اﻷﻣﺮﻳﻜﻴﺔ ﻟﻠﻌﻠﻮم اﻧﺪﻓﺎﻋ اﺳـ ﺎً ﺎً ﺘﺜﻨﺎﺋﻴ ﻣﻦ اﻟﻀﻮء اﻟ ﺮادﻳﻮي ﻧﺎﺗﺠ ﺎً ﻋﻦ ﺣـﺪث ﻛـﻮﻧﻲ ﻧﺎدر ﻳﻘﻮم ﻓﻴﻪ ﺛ ﻘﺐ أﺳـﻮد ﻣﺘﻮﺳـﻂ اﻟﻜﺘﻠـﺔ ﺑﺘﻤﺰﻳﻖ ﻧﺠﻢ ﻛﺎﺷﻔ ﺎً ﻋﻤﺎ ﻳﺒـﺪو أﻧـﻪ اﻟﺘـﻮﻫﺞ اﻟﻼﺣﻖ ﻟﻨﻔﺎﺛﺔ ﻗﻮﻳﺔ ﺗﺮﺻﺪ ﺧﺎرج ﻣﺤﻮرﻫـﺎ . وﻇﻬــﺮ ﻫــﺬا اﻟﺤــﺪث ا ﻌــﺮوف ﺑﺎﺳــﻢ AT2019ijn ﻷول ﻣـﺮة ﻋـﲆ ﻫﻴﺌـﺔ وﻣﻀـﺔ زرﻗﺎء ﺳﺎﻃﻌﺔ ﰲ ا ﺴﻮﺣﺎت اﻟﺒﴫﻳﺔ إذ ازداد ﺳﻄﻮﻋﻪ ﺣ ﺘﻰ ﺑﻠﻎ ذرو ﺗﻪ ﺧﻼل ﺑﻀـﻌﺔ أﻳـﺎم ﻓﻘﻂ ﻗﺒﻞ أن ﻳﺨﻔﺖ ﺑﻮﺗ ة أﺑﻄﺄ ﺑﻜﺜـ ﻣﻤـﺎ ﻫـﻮ ﻣﻌﺘـﺎد ﰲ اﻟﻈـﻮاﻫﺮ اﻟﻌـﺎﺑﺮة ا ﻤﺎﺛﻠـﺔ . وﻋﻨﺪﻣﺎ ﻓﺤﺺ ﻋﻠﻤ ﺎء اﻟﻔﻠـﻚ ﻻﺣﻘـﺎً أرﺻـﺎداً رادﻳﻮﻳﺔ وﺟﺪوا أﻣﺮ اً أﻛﺜـﺮ ﻏﺮاﺑـﺔ إذ اﺳـﺘﻤﺮ اﻻﻧﺒﻌﺎث اﻟﺮادﻳﻮي ﰲ اﻻزدﻳﺎد ﰲ اﻟﺴﻄﻮع ﺪة ﻗﺎرﺑﺖ ﻋﺎﻣ وﺑﻠﻎ ﻌﺎﻧ ﺎً ﻳﻔـﻮق ﺑﻜﺜـ ﻣـﺎ ﻳﺮﺻـﺪ ﻋـﺎدة ﰲ اﻻﻧ ﻔﺠـﺎرات اﻟﻨﺠﻤﻴـﺔ ﻋﻨـﺪ ﻣﺮاﺣﻞ ﻣﻤﺎﺛﻠﺔ ﺛﻢ أﻋﻘﺐ ذﻟﻚ ﺗﺮاﺟـﻊ ﺑﻄـﻲء اﺳـﺘﻤﺮ ـﺪة ﻻ ﺗﻘ ـﻞ ﻋـﻦ أرﺑ ـﻊ ﺳـﻨﻮات . ـــــــــــــــــــــــــــــــــــــ - ﺳﺒﺘﻤﺒﺮ ﺃﻛﺘﻮﺑﺮ 2 0 2 6