Summary
When a new celestial source is detected in an energy range, for example X-rays, where the total number of known sources is relatively small, attempts will be made to identify it with objects already known in other energy ranges. We discuss the problems that we encountered in trying to identify a number of X-ray sources, detected by the Imaging Proportional Counter of the Einstein Observatory, with catalogued extragalactic objects. The main problem is the lack of precision in the coordinates of the less recent catalogues.
Riassunto
Quando una sorgente celeste viene rilevata in una gamma di energia, per esempio in raggi X, dove il numero totale di sorgenti note è relativamente piccolo, si tenta di identificarla con oggetti già noti in altre gamme di energia. Discutiamo qui i problemi da noi incontrati nel tentare di identificare sorgenti X rivelate dall'Imaging Proportional Counter dell'Osservatorio Einstein (1) con oggetti extragalattici catalogati. Il problema principale è la mancanza di precisione nelle coordinate dei cataloghi meno recenti.
Резюме
Когда детектируется новый небесный источник в некоторой энергетической области, например, в рентгеновском диапазоне, где полное число известных источников относительно мало, предпринимаются попытки идентифицировать этот источник с уже известными объектами в других энергетических областях. Мы обсуждаем проблемы, с которыми мы встречаемся при попытках идентифицировать ряд рентгеновских источников, зарегестрированных с помощью пропорционального счетчика лаборатории Эйнштейна, с внегалактическими объектами, имеющимися в каталогах. Главная проблема-недостаточная точность в определении координат в ранее опубликованных каталогах.
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Pizzichini, G., Rebecchi, S. Computer identification of celestial objects and its problems: the case of optical identification of X-ray sources. Il Nuovo Cimento C 13, 489–496 (1990). https://doi.org/10.1007/BF02507087
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DOI: https://doi.org/10.1007/BF02507087