HIGH-RESOLUTION OPTICAL AND UV OBSERVATIONS OF THE CENTERS OF NGC-1316 AND NGC-3998 WITH THE HUBBLE-SPACE-TELESCOPE

被引：28

作者：

FABBIANO, G ^{[1
]}

FASSNACHT, C ^{[1
]}

TRINCHIERI, G ^{[1
]}

机构：

[1] OSSERV ASTRON MILANO, I-20121 MILAN, ITALY

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 434卷 / 01期

关键词：

GALAXIES; ACTIVE; INDIVIDUAL; (NGC; 1316; NGC; 3998); NUCLEI; ULTRAVIOLET;

D O I：

10.1086/174705

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

B and UV high-resolution images obtained with the HST FOC reveal centrally increasing surface brightness and UV-bright point sources at the nuclei of the early-type galaxies NGC 1316 and NGC 3998. Model fitting of the surface brightness distribution does not exclude a central flattening, which could however be the result of extinction and/or of improper evaluation of the point-source component. The present data, while not requiring the presence of central massive black holes in these two galaxies, make them possible candidates. Follow-up work is needed to study this point further. The presence of unresolved nuclei gives model-dependent support to this quest, if these sources are due to small AGN. These UV-bright sources could belong to the low-luminosity end of active nuclear emission.

引用

页码：67 / +

页数：1

共 41 条

[1] ENERGY-SPECTRA OF X-RAY CLUSTERS OF GALAXIES [J].