PESSTO uchwycił supernową w Messier 74
Przegląd PESSTO prowadzony przez ESO uzyskał pokazany tutaj obraz Messier 74, niesamowitej galaktyki spiralnej z dobrze zdefiniowanymi ramionami. Jednak naprawdę ciekawym obiektem na zdjęciu jest nowy, błyszczący dodatek do galaktyki z końca lipca 2013 r.: supernowa typu II o nazwie SN2013ej, którą widać jako najjaśniejszą gwiazdę w lewym dolnym rogu obrazka.
Tego typu supernowa zdarza się gdy jądro masywnej gwiazdy kolapsuje pod wpływem własnej grawitacji pod koniec życia gwiazdy. Kolaps ten skutkuje potężną eksplozją, która wyrzuca materię daleko w przestrzeń kosmiczną. Detonacja może być bardziej jasna niż cała galaktyka, w której następuje i dostrzegalna dla obserwatorów nawet przez tygodnie i miesiące.
PESSTO (Public ESO Spectroscopic Survey for Transient Objects) jest przeznaczony do badania obiektów, które pojawiają się na krótko na nocnym niebie, takich jak supernowe. Dokonuje tego za pomocą kilku instrumentów na teleskopie NTT (Teleskopie Nowej Technologii), pracującym w Obserwatorium ESO La Silla w Chile. Nowe zdjęcie SN2013ej zostało wykonane za pomocą NTT podczas przeglądu PESSTO.
SN2013ej jest trzecią supernową, którą zarejestrowano w Messier 74 od początku tego millenium, dwie pozostałe to SN 2002ap i SN 2003gd. Informacja o niej pojawiła się po raz pierwszy 25 lipca 2013 r. od zespołu teleskopu KAIT z Kalifornii, a pierwsze "zdjęcie sprzed odkrycia" wykonała miłośniczka astronomii Christina Feliciano, która korzystała z dostępnej publicznie SLOOH Space Camera do spojrzenia na ten obszar w dniach i godzinach bezpośrednio przed wybuchem.
Messier 74 w konstelacji Ryb jest jednym z najtrudniejszych obiektów Messiera do dostrzeżenia przez miłośników astronomii, z powodu małej jasności powierzchniowej. Mimo wszystkoSN2013ej nadal powinna być w zasięgu miłośników astronomii przez kolejne kilka tygodni jako słaba, gasnąca gwiazda.
Linki
Źródło:ESO/PESSTO/S. Smartt
O zdjęciu
| Identyfikator: | potw1335a |
| Język: | pl |
| Typ: | Obserwacje |
| Data publikacji: | 2 września 2013 10:00 |
| Rozmiar: | 980 x 985 px |
O obiekcie
| Nazwa: | Messier 74, SN 2013ej |
| Typ: | Local Universe : Star : Evolutionary Stage : Supernova Local Universe : Galaxy : Type : Spiral |
| Odległość: | 30 milion lat świetlnych |
| Constellation: | Pisces |
Współrzędne
| Pozycja (RA): | 1 36 41.85 |
| Pozycja (Dec): | 15° 47' 0.27" |
| Pole widzenia: | 3.95 x 3.97 arcminutes |
| Orientacja: | North is 0.0° lewo of vertical |
Kolory i filtry
| Pasmo | Długość fali | Teleskop |
|---|---|---|
| Optyczny B | 440 nm | New Technology Telescope EFOSC |
| Optyczny V | 548 nm | New Technology Telescope EFOSC |
| Optyczny R | 640 nm | New Technology Telescope EFOSC |
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