?? ????????????????????????

????:1?????????????:?????????????
2??????
3??????????
4?????98????
5??????????
????2????????21????????????????????????? (?????? ?)?????,?????????,???????????
????????????????
??????????2???????????????21??????????,??????????????,????????????????“??????????????”(??????)??,?“???”????????????

???(Gaia)?????????????(????????,LAMOST)??,??????????,??????????J0731+3717?????2000??????????????,??????550?? M15??????????????????????????“??????????????????????”,????? M15???
??????/?????????,??«????»??????????????
?????,?????????????????????,???????????????J0731+3717?????????????,???“????????????????”???????????
????
??????,????????????(????????????‘?????????????’?????????????????????X-1)?????????????????????(??????Sgr A*)??????,???????????????????,????????????,???????????

???????????????????????,????????????????????????,????:?????????????????????????????????(????)???,??????????????(???????????????);???,??????????????????????????????????????????(?????????????)?
???????
???????????????????????????21???????????????????,??????(HST)????????????????M15??,??M15??1700????????????????3200???,?????,?,?????????????
????????????????,???500???????????????????????????????,?????????????7??????????????????,??????????
?,???????????
??????
??????????????????????,???????????????????????????“????”,??????????????????,??????J0731+3717?????????????????????2000????550?????????M15?????????????????????????,???????M15???

??????,????????,?????????????????????????????????????????????,????,???????????“???????????????”???????????????????,?????/??????,??????????????????,?M15?????
??????????,????“?????????????”?????????????? J0731+3717,?????????(??????????????????)
???????????????????????????:????