{"id":800,"date":"2025-10-01T09:49:58","date_gmt":"2025-10-01T07:49:58","guid":{"rendered":"https:\/\/atri2.mtf.stuba.sk\/?page_id=800"},"modified":"2026-02-11T13:10:28","modified_gmt":"2026-02-11T12:10:28","slug":"astrofyzika","status":"publish","type":"page","link":"https:\/\/atri.mtf.stuba.sk\/?page_id=800","title":{"rendered":"Astrofyzika"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Kataklizmatick\u00e9 premenn\u00e9<\/h3>\n\n\n\n

Zauj\u00edma n\u00e1s r\u00fdchla stochastick\u00e1 variabilita (tzv. blikanie) generovan\u00e1 akre\u010dn\u00fdmi procesmi v kataklyzmick\u00fdch premenn\u00fdch hviezdach. Zauj\u00edmaj\u00fa n\u00e1s hlavne tie, ktor\u00e9 maj\u00fa disk. Toto dynamick\u00e9 fotometrick\u00e9 spr\u00e1vanie prin\u00e1\u0161a v\u0161etky inform\u00e1cie o geometrii akr\u00e9cie a jednotliv\u00fdch substrukt\u00farach toku. Najzauj\u00edmavej\u0161ia je centr\u00e1lna oblas\u0165 bl\u00edzko centr\u00e1lnej kompaktnej hviezdy vy\u017earuj\u00facej r\u00f6ntgenov\u00e9 \u017eiarenie. Pre tento v\u00fdskum pou\u017e\u00edvame optick\u00e9 \u00fadaje z\u00edskan\u00e9 satelitom Kepler (pr\u00edklad), TESS (pr\u00edklad) a r\u00f6ntgenovou observat\u00f3riou XMM-Newton (pr\u00edklad). H\u013ead\u00e1me charakteristick\u00e9 frekvencie v krivk\u00e1ch svietivosti s cie\u013eom lokalizova\u0165 fyzik\u00e1lny zdroj variability (pr\u00edklad). V druhom pr\u00edpade rozli\u0161ujeme zdroj \u017eiarenia a p\u00f4vodn\u00fd zdroj fluktu\u00e1cie, t. j. fluktu\u00e1ciu hmotnej akr\u00e9cie generovan\u00fa na vonkaj\u0161om akre\u010dnom disku, ktor\u00e1 sa \u0161\u00edri dovn\u00fatra a uvo\u013e\u0148uje \u017eiarenie na vn\u00fatornej hranici disku. Pou\u017e\u00edvame aj ne\u0161tandardn\u00e9 met\u00f3dy, ako je priemern\u00fd profil r\u00fdchlej variability, kde m\u00f4\u017eeme priamo \u0161tudova\u0165 jednotliv\u00e9 substrukt\u00fary r\u00fdchlej variability, ktor\u00e9 nie je mo\u017en\u00e9 rozl\u00ed\u0161i\u0165 napr\u00edklad met\u00f3dami zalo\u017een\u00fdmi na Fourierovej transform\u00e1cii (pr\u00edklad).<\/p>\n\n\n\n

N\u00e1\u0161 t\u00edm sa zameriava najm\u00e4 na sign\u00e1ly. Okrem blikania sa zauj\u00edmaj\u00fa aj o periodick\u00e9 alebo kvaziperiodick\u00e9 oscil\u00e1cie v kr\u00e1tkych sveteln\u00fdch krivk\u00e1ch satelitov so v\u0161etk\u00fdmi artefaktmi periodogramu (pr\u00edklad). Simul\u00e1cie Monte Carlo s\u00fa v tomto pr\u00edpade ve\u013emi u\u017eito\u010dn\u00e9 (pr\u00edklad). Spolupracujeme s na\u0161imi partnermi na variabilite nov a pou\u017e\u00edvame \u00fadaje z XMM-Newton a Chandra (pr\u00edklad). Cie\u013eom je identifikova\u0165 rot\u00e1ciu bieleho trpasl\u00edka alebo pulz\u00e1cie vo vrstve spa\u013eovania vod\u00edka. Periodogramy s\u00fa niekedy ve\u013emi zlo\u017eit\u00e9 a r\u00f4zne efekty vytv\u00e1raj\u00fa ru\u0161iv\u00e9 artefakty (pr\u00edklad). Tak\u00fdto problematick\u00fd periodogram m\u00f4\u017ee vies\u0165 k nespr\u00e1vnej interpret\u00e1cii. Z\u00e1kladnou v\u00fdzvou je ot\u00e1zka, \u010di je frekvencia oscil\u00e1ci\u00ed, ktor\u00e9 vid\u00edme, stabiln\u00e1 alebo premenliv\u00e1 (pr\u00edklad).<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

 <\/h3>\n\n\n\n

Akt\u00edvne galaktick\u00e9 jadr\u00e1<\/h3>\n\n\n\n

Ke\u010f\u017ee kataklyzmick\u00e9 premenn\u00e9 s\u00fa syst\u00e9my poh\u00e1\u0148an\u00e9 akr\u00e9ciou, ako napr\u00edklad r\u00f6ntgenov\u00e9 dvojhviezdy alebo AGN, nebr\u00e1nime sa poh\u013eadu \u010falej. Analyzovali sme r\u00fdchlu premennos\u0165 AGN pr\u00edtomn\u00fdch v poli Kepler, aby sme vyh\u013eadali viaczlo\u017ekov\u00fa povahu blikania (pr\u00edklad). V tomto pr\u00edpade boli ve\u013emi u\u017eito\u010dn\u00e9 aj \u00fadaje z r\u00f6ntgenov\u00e9ho teleskopu Swift. Doteraz sme \u0161tudovali in\u0161trument\u00e1lne efekty, ktor\u00e9 silne kontaminuj\u00fa pozorovania AGN teleskopom Kepler (pr\u00edklad). H\u013ead\u00e1me spolo\u010dn\u00e9 akre\u010dn\u00e9 odtla\u010dky v kataklyzmick\u00fdch premenn\u00fdch a AGN. Zistili sme ve\u013emi podobn\u00fa morfol\u00f3giu priemern\u00e9ho profilu erupcie v troch typoch akre\u010dn\u00fdch objektov: kataklyzmick\u00e1 premenn\u00e1, r\u00f6ntgenov\u00e1 bin\u00e1rna hviezda a blazar (pr\u00edklad). Podrobnej\u0161ie sme \u0161tudovali tri galaxie Seyfert 1 IRAS 132243809, 1H 0707-495 a Mrk 766 pozorovan\u00e9 pomocou XMM-Newton (pr\u00edklad). Zistili sme podrobn\u00e9 substrukt\u00fary profilu erupcie, ktor\u00e9 nazna\u010duj\u00fa r\u00f4zne emisn\u00e9 oblasti. Zistili sme ve\u013emi podobn\u00fa morfol\u00f3giu erupcie v t\u00fdchto AGN a CV MV Lyr v pokoji, \u010do nazna\u010duje podobn\u00e9 vlastnosti akre\u010dn\u00e9ho toku.<\/p>\n\n\n

\n
\"\"\/<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

T\u00edm<\/h3>\n\n\n\n
Jozef Magdolen<\/td>     IT\/program\u00e1tor, timing analysis, periodic\/quasiperiodic variability, use of AI<\/td><\/tr>
Martin Melicher\u010d\u00edk<\/td>     IT\/program\u00e1tor, simulations of periodic\/quasiperiodic variability, search for specific objects (bow shocs), use of AI<\/td><\/tr>
Michal Pri\u0161egen<\/td>     astrofyzik, white dwarf population, stellar associations<\/td><\/tr>
Andrej Dobrotka<\/td>     astrofyzik, fast variability in CVs and AGNs, timing analysis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Kataklizmatick\u00e9 premenn\u00e9 Zauj\u00edma n\u00e1s r\u00fdchla stochastick\u00e1 variabilita (tzv. blikanie) generovan\u00e1 akre\u010dn\u00fdmi procesmi v kataklyzmick\u00fdch premenn\u00fdch hviezdach. Zauj\u00edmaj\u00fa n\u00e1s hlavne tie, ktor\u00e9 maj\u00fa disk. Toto dynamick\u00e9 fotometrick\u00e9 spr\u00e1vanie prin\u00e1\u0161a v\u0161etky inform\u00e1cie o …<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":90,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","footnotes":""},"class_list":["post-800","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/pages\/800","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=800"}],"version-history":[{"count":24,"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/pages\/800\/revisions"}],"predecessor-version":[{"id":1008,"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/pages\/800\/revisions\/1008"}],"up":[{"embeddable":true,"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=\/wp\/v2\/pages\/90"}],"wp:attachment":[{"href":"https:\/\/atri.mtf.stuba.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}