UGC 05832 – high redshift galaxy within disk

There has apparently not been a discussion of discordant redshifts in this system before. There is a high redshift galaxy (object 2 in Figure 1, z = 0.2) within the visible disk of UGC 05832 (object 1, z = 0.004). There are no other objects at the redshift of object 2 within this field, so there’s no knowledge of possible background group to which this object might belong.

There is another galaxy (object 3, z = 0.067) right next to UGC 05832. It has far too high redshift to be a companion galaxy in traditional sense. There’s no knowledge of a possible background group to which this object might belong. On the other side of UGC 05832 there’s another small looking galaxy (object A, no redshift available). Objects 3 and A are aligned almost exactly across the nucleus of UGC 05832. It would be interesting to know the redshift of object A. SDSS gives photometric redshifts of z = 0.0873 and z = 0.099824 for object A but photometric redshifts are not very reliable for a single object.

Figure 2 shows NED skyplot for the objects with redshifts within 10 arcmin from UGC 05832. There are several objects so it is not surprising to see couple of alignments there. It might be noteworthy that two object pairs (first pair with z = 1.45 and z = 0.096 and second pair with z = 0.091 and cz = 6543 km/s) are aligned almost exactly across UGC 05832. This makes exactly aligned pair count three for UGC 05832.

There are three QSOs in the field two of which have redshift of about z = 1.6.

Figure 1. The objects with measured redshifts near UGC 05832. Size of the image is 5 x 5 arcmin. Image is from Sloan Digital Sky Survey (SDSS).

Figure 2. The objects with measured redshifts within 10 arcmin from UGC 05832. Objects 1-3 from Figure 1 are given in blue. Redshifts of outer objects are given in red. Image is from NED Skyplot.

Objects and their data

1 UGC 05832 SB? 0.004056 (1216 km/s) 14.0 (g) 0
2 SDSS J104248.72+132710.8 galaxy 0.202523 15.6 (g) 0.415
3 SDSS J104246.40+132811.9 galaxy 0.067277 (20169 km/s) 17.8 (g) 0.785
A SDSS J104251.90+132635.3 galaxy ? 19.7 (g) 1.307

NED objects within 10′ from UGC 05832.

SDSS image of the system.

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2 Responses

  1. a.k.a. Arp 291. That’s a lot of potential QSOs so far that might line up with Arp’s hypotheses. It’s still easy enough to claim uncertainty even with the collection so far – what are we going to need to clinch these things?

  2. In my opinion, you can only do it by statistical analysis with large samples (working on that…). This kind of stamp collecting I do here – i.e. single systems presented as individual cases – does not prove much.

    These days there’s actually quite a lot of data available so that in my opinion it is possible to constrain the alternative hypotheses considerably. One just needs to do the work.

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