Пик излучения

Пик излучения приходится на полосу 25 мкм, что тоже необычно. Излучение большинства других активных галактик наиболее интенсивно на длине волны 60 мкм. Механизм этого процесса неизвестен. Наиболее вероятная возможность — нереизлучение межзвездной пылью в ядре энергии того ультрафиолетового излучения, которое ее нагревает. ИК- излучение могло иметь и нетепловую природу, хотя отсутствие каких-либо изменений во время наблюдений в течение нескольких месяцев свидетельствует против такой интерпретации.

Квазары делятся на две группы, называемые радиоизлучающими и радио- спокойными. Физические процессы, лежащие в основе различия между ними, не поддаются объяснению. Их светимости в радиодиапазоне отличаются в 100 ООО и более раз, но спектры в видимой и ультрафиолетовой областях аналогичны. Ясно, что в промежуточной, т.е. инфракрасной, области спектры должны резко отличаться; эти различия вполне могут дать ключ к механизму образования энергии.

Были проанализированы данные наблюдений со спутника ИРАС для трех радиоизлучающих и двух радио- спокойных квазаров. Никаких критических различий в распределении энергии по четырем полосам не было обнаружено, т.е. расхождение спектров должно наблюдаться на длинах волн больше 100 мкм. Однако проявилось более гонкое различие. Для радиоизлучающих источников ИК-данные хорошо вписываются в прямолинейную интерполяцию между видимой областью и радиодиапазоном. Для радио- спокойных квазаров аналогичная линия, соединяющая эти две области спектра, должна иметь более крутой наклон, так как поток ИК-излучения спадает быстрее с ростом длины волны. Измерения радиоспокойных источников не удается «подогнать» под такую линию — наблюдается избыточное излучение на длине волны 100 мкм.



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