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The merger stage of the ultra-luminous infrared galaxy IRAS 03158+4227
We examine the merger stage of IRAS 03158+4227, one of the most luminousULIRGs from the IRAS 2 Jy sample. Deep optical images are presentedalong with high-resolution NIR images and optical low-resolutionspectra. IRAS 03158+4227 is confirmed as a component of anequal-luminosity binary galaxy with a nuclei separation of 47h75-1 kpc. A long lopsided tail emanating from thecompanion, which harbours an active nucleus, is the most prominentpeculiar feature of the binary. The results of numerical simulationspermit the interpretation of this structure as a product of the tidalinteraction between the two components. If the infrared-activity of IRAS03158+4227 is also dynamically triggered by this process, this wouldimply that the ULIRG phenomenon is not restricted to the final stage ofa binary merger. Alternatively, the system may be a multiple mergerwhere the partner(s) has/have already coalesced.
| Precise positions in the FK4 system for 120 radio source reference stars
Positions are given in the FK4 system for 120 primary reference starsgrouped around the optical counterparts of 11 extragalactic radiosources. The observations were made in 1979 and 1980 with the 6-in.transit circle of the U.S. Naval Observatory. The results reported hererepresent the first step in a three-tiered process to determineastrometric positions of the optical counterparts referred to the systemof the FK4. One application of such positions is the determination of anearly inertial optical reference frame, which eventually may becompared to a reference frame at radio wavelengths.
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