Telescópio Espacial James Webb (JWST) yakaratidza zvinhu zvisati zvamboitika pamusoro pemapoka enyeredzi ari kusimukira mu spiral galaxy NGC 628, inowanikwa mamirioni makumi matatu echiedza-makore kubva kuTerra. Chikwata chepasi rose chevazivi venyeredzi chakashandisa chiridzwa cheNIRSpec chemucherechedzo kupinda mumakore eguruva uye kuratidza gumi nemana emasumbu aya, anozivikanwa seeYSCs (masumbu enyeredzi diki dziri kusimukira). Zvakacherechedzwa, zvakaitwa pasi pechirongwa cheFEAST, zvakaona kuburitsa kwakanyanya kweionized hydrogen, molecular hydrogen uye polycyclic inonhuhwirira hydrocarbons (PAHs), zvichiratidza simba rekutanga danho rekushanduka-shanduka rinofambiswa nenyeredzi huru dzinopisa.
Iyo data inoratidza kuti masumbu akaferefetwa ane mazera epakati anosvika mamirioni matatu emakore, ane ionizing photon fluxes inoenderana nenyeredzi dze spectral mhando O8.5V kusvika O8V. Iwo akabatana mafotodissociation regions (PDRs) anoratidza kuburitsa kwakajeka kubva kuPAHs pa3.3 µm uye akawanda molecular hydrogen transitions. Sezvo masumbu achikura uye achibuda mugore rekuzvarwa, ese mamorekuru uye PAH kubuda kunoderera, zvichiratidza kubatana kwakananga pakati pekushanduka kwesumbu uye PDR morphology.
Izvo zvakaonekwa zvinosanganisa mifananidzo yeNIRCam mumasefa chaiwo, akadai seF335M yePAHs, F405N yeBrα uye F444W yekuenderera mberi kwe stellar, ine NIRSpec spectroscopy muMOS mode. Gwara renzou NGC 628, rinozivikanwawo se Messier 74, rine maoko akatenderedzwa akanyatsotsanangurwa uye mwero wepasi rose wekugadzira nyeredzi we1.7 solar masses pagore.
Details of spectral observations
Iyo hydrogen uye helium recombination mitsetse inoteedzera H II matunhu anofambiswa neEYSCs. Emissões yePAH neH₂ inomuka zvakanyanya kubva kumaPDR ari pedyo nemasumbu.
Masumbu madiki anotonga ionizing emission, nepo masiginecha enyeredzi dzakashanduka, senge matsvuku makuru, anoonekwa muzvinhu zvakakura kupfuura 9 miriyoni makore.
Spectral characterization yakatenderedza PDRs uye diffuse interstellar medium (ISM), ichipa manzwisisiro mukutanga stellar mhinduro.
Evolution yemasumbu uye PDRs
Kudzikira kwePAHs uye mamolecular hydrogen emissions sezera remasumbu kunoratidza kuti PDRs inoshanduka morphologically sezvo masumbu anobuda kubva muguruva.
Nyeredzi dzinopisa dzakakura muYSCs dzinoburitsa yakanyanyisa ionizing mwaranzi, ichigadzira zvakatenderedza uye kufambisa shanduko kune mamwe akafumurwa nhanho.
Maitiro acho anotaridza kuti mhinduro kubva kunyeredzi diki inokanganisa sei multiphase ISM mumagalaxi anotenderera.
Hunhu hweiyo galaxy NGC 628
NGC 628 inofungidzirwa kuva pakati pemakore gumi kusvika gumi nematatu emakore uye inoratidza inosimba yekugadzira nyeredzi mumawoko ayo anotenderera.
Hukama hwepedyo hunobvumira kutarisisa kwakadzama kweEYSCs, iyo inoshanda seyakakosha zvivharo zvekudzidza galactic evolution.
Iyo data yeJWST inokunda zvipimo zveoptical wavelengths, uko huruva inovhara izvi zvinhu zvidiki.
FEAST chirongwa uye NIRSpec chiridzwa
Iyo FEAST chirongwa chinotarisa pane mhinduro mune ari kusimukira extragalactic nyeredzi masumbu, vachishandisa kugona kweNIRSpec yezvakawanda-zvinhu spectroscopy.
Iyo Micro-Shutter Assembly (MSA) magadzirirwo aibvumira kutarisa nzvimbo dzakawanda nepamusoro-soro yekugadzirisa.
NIRSpec’s slit footprints inoratidza chaiyo nzvimbo yekugovera kwezvakaonekwa zvinobuda.
Zvinoreva pakuumbwa kwenyeredzi
eYSCs inomiririra zvikamu zvakakosha apo stellar mhinduro inotanga kuparadzira gasi rekuzvarwa neguruva.
Zvakaonekwa zvinosimbisa kuti zvisumbu zvakakora, zvakasungwa negiravhiti zvinoumba zvimiro zvakakosha munzvimbo dzine gasi.
Kuonekwa kwemitsara chaiyo kunosimbisa mhando dzekutanga kushanduka kwemasumbu makuru.
Zvabuda muzvidzidzo zvakatsikiswa
Iro basa, rakaburitswa mu preprint pa arXiv munaKurume 10, 2026, rinopa yekutanga yakadzama spectral ratidziro yeiyo yekutanga sampu yeYSCs muNGC 628.
Mazera anobva ku spectral energy distribution (SED) anokwana anoenderana neaya akafungidzirwa spectroscopically.
Vanyori vanosimbisa hukama pakati pema molecular / PAH emission uye kubuda kwemasumbu.
Mamwe maonero ekutarisa
NIRSpec yakatibvumira kupinda mumakore akasviba, tichiratidza zvinhu zvisingaonekwe mumaopikisi.
Mifananidzo yakaumbwa inosimbisa zvinzvimbo zveYSCs uye nzvimbo dzakakura dzekufarira.
Ongororo yenguva yemberi inogona kuwedzera sampuli kuti unzwisise zviri nani kutenderera kwenyeredzi mugirazi.
