Magnetar SGR 1935 + 2154, uas tau tshaj tawm thawj zaug kaw lub xov tooj cua tau tawg los ntawm sab hauv Milky Way thaum lub Plaub Hlis, tau ua nws dua, muab sijhawm rau cov kws tshawb fawb lwm lub sijhawm los daws qhov kev xav tsis thoob hauv ntiaj teb.
Thaum Lub Kaum Hli 8, 2020, CHIME / FRB kev koom tes tau tshawb pom lub hnub qub SGR 1935 + 2154, tso tawm peb lub millisecond xov tooj cua tawg. Ua raws li qhov no, FAST xov tooj cua tsom iav tau pom lwm yam - pulsed xov tooj cua tso tawm kom haum rau lub sijhawm sib hloov ntawm cov hlau nplaum.
Txog rau lub Plaub Hlis xyoo no, xov tooj cua tawg sai (FRBs) tau kaw tsuas yog sab nraum peb lub galaxy, feem ntau yog los ntawm ntau lab lub xyoo dhau los. Thawj zaug tau pom nyob rau xyoo 2007, thiab txij thaum ntawd los, cov kws tshawb fawb hnub qub tau sim los xyuas seb dab tsi ua rau lawv.
Raws li lub npe qhia, FRBs tau tawg ntawm cov xov tooj cua muaj zog heev pom hauv qhov chaw, qee qhov tso tawm ntau zog ntau dua li ntau pua lab lub hnub. Lawv tsuas kav ntev li milliseconds.
Txij li feem ntau cov peev txheej ntawm xov tooj cua nrawm tawg zoo li tso lawv ib zaug xwb, lawv tsis tuaj yeem kwv yees tau. Ib qho ntxiv, cov uas peb pom feem ntau yog los ntawm thaj chaw nyob deb ntawm qhov chaw uas lub tsom iav tsom iav tsis tuaj yeem paub qhov txawv ntawm cov hnub qub thiab txiav txim siab qhov chaw ntawm lub teeb liab. Ob qho ntawm cov yam ntxwv no ua rau nws nyuaj rau taug qab FRB txawm tias yog lub hauv paus tseeb ntawm galaxy, cia nyob ib leeg lub hnub qub tshwj xeeb.
Tab sis SGR 1935 + 2154 tsuas yog 30,000 lub xyoo dhau los xwb. Thaum lub Plaub Hlis 28, 2020, nws tau tso tawm lub zog millisecond pulse, uas yog lub npe FRB 200428. Tom qab lub teeb liab lub zog tau hloov kho rau qhov deb, FRB 200428 tsis muaj zog li extragalactic xov tooj cua nrawm tawg - tab sis txhua yam hauv nws sib xws rau lwm qhov tawg.
Peb tsis paub ntau txog peb qhov tawg tshiab tam sim no. Txij li cov kws tshawb fawb tseem tab tom ua haujlwm ntawm cov ntaub ntawv, nws muaj peev xwm tias qee qhov kev tshawb pom thaum ntxov tuaj yeem hloov pauv. Tab sis tam sim no peb tuaj yeem hais tias lawv ob leeg zoo ib yam thiab tsis zoo ib yam li FRB 200428.
Qhov tawg tau rov muaj zog me ntsis dua li qhov ua ntej, tab sis lawv tseem muaj zog heev thiab ua rau muaj teeb meem ntawm milliseconds.
"Ib qho ntawm qhov ntxim nyiam tshaj plaws ntawm qhov kev tshawb pom no yog tias peb qhov tawg tawg zoo li tau tshwm sim thaum tib lub sijhawm tig ntawm lub hnub qub. Nws tau paub tias magnetar tig txhua ~ 3, 24 vib nas this, tab sis qhov tawg thawj zaug thiab thib ob tau sib cais los ntawm 0, 954 vib nas this, thiab qhov thib ob thiab thib peb tau sib cais los ntawm 1, 949 vib nas this. Qhov no yog qhov txawv me ntsis, thiab peb xav tias yav tom ntej nws tsim nyog kawm qhov tshwm sim kom ze dua, "cov kws tshawb fawb sau.