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The Physical Nature of the Blue Objects in the Field of BD + 15° 2469 (Virgo Cluster)
Author(s) -
Abati L. E.,
Lorenz H.
Publication year - 1984
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113050302
Subject(s) - virgo cluster , astrophysics , physics , galaxy , quasar , stars , cluster (spacecraft) , field (mathematics) , astronomy , galaxy cluster , mathematics , computer science , pure mathematics , programming language
The physical nature of 277 ultraviolet excess objects of the third Asiago field (22 square degrees, 15 ≦ m pg ≦ 18, U–B ≦≦ ‐0.2) is investigated on the basis of objective prism plates. Most of them are stars, 8% are quasar candidates and 7% compact galaxies. The proportions of different kinds of objects changes with the magnitude and U–B colour index. The surface density of quasars is estimated to be between 0.5 Q/sq. deg. and 1.0 Q/sq. deg. for the UVX A 3 objects. The results of the A 3 field (located in the Virgo cluster of galaxies) statistically agree with the ones of the A 1 field, outside clusters of galaxies.