53W 003 – lot of high-z objects

Pascarelle et al. (1998) reported about a population of objects at z ~ 2.4 in the field containing 53W 003. They suggested that there’s a large scale structure at that redshift. This was followed up by many studies, such as Keel et al. (1999), who show individual images of the objects and a nice map of the field. They also reported a finding of two quasars in the field (objects 6 and 11 in Figure 1 here) having similar redshift as the large scale structure.

Arp (1999) discussed this system as discordant redshift system. Arp noted that the two quasars found by Keel et al. were aligned across 53W 003 and separated from the other group of similar redshift objects. Arp discussed some properties of 53W 003 and noted:

The first important point for this paper, however, is that such galaxies are rare, and finding one this close to a very unusual grouping of high redshift objects is clearly noteworthy.

Arp showed that there were only three medium redshift quasars in the Her I and Her II fields and two of them fell close to 53W 003 (but outside the field presented in figure 1). Third fell close to another similar galaxy as 53W 003. Arp also noted that there seemed to be more quasars near 53W 003 than average density would suggest. The shape of the high redshift objects near 53W 003 also caught Arp’s eye:

All our empirical experience would indicate that the most luminous galaxies are massive, relaxed, equilibrium forms. But in the 53W003 field, as in the typical Hubble Deep Field, there is a preponderance of blue, irregular-shaped objects, which I would argue is prima facie evidence for low-luminosity, intrinsically redshifted young matter in various stages of compactness.

Notes

There are lot of faint objects in the field with redshifts available from The Bright Ages Survey. They are difficult to locate exactly from the DSS image presented here, so most of them have been left out from Figure 1 but at least a few closest to 53W 003 are indicated (objects 3, 4, and 5). Interested readers can check them from NED list of objects within 10′ from 53W 003 with redshifts available.

Object 8 is not the big elliptical object, but it is some very faint object in its vicinity.


Figure 1. The field around 53W 003. Size of the image is 10 x 10 arcmin. Image is from Digitized Sky Survey (POSS2/UKSTU Blue), and it has been adjusted for brightness and contrast to bring out the faint objects.

Objects and their data

NBR NAME TYPE REDSHIFT (cz) MAG SEPARATION
1 53W 003 galaxy pair 0.050000 (14990 km/s) 0
2 2MASX J17141672+5018167 galaxy 0.045300 (13581 km/s) 13.8 (K) 0.065
3 BAS 1714+5015 M133 IrS 0.045700 (13701 km/s) 17.1 (K) 0.242
4 BAS 1714+5015 M052 galaxy 1.088000 19.2 (K) 0.363
5 BAS 1714+5015 M057 galaxy 0.046000 (13790 km/s) 20.0 (K) 0.494
6 [KCW99] 04 QSO BLAGN 2.393000 24.37 0.706
7 [WBM91] 2 galaxy 2.388000 22.50 2.801
8 [PWK98] 008 galaxy 2.386000 25.6 2.803
9 53W 002d galaxy sp+comp 0.275000 19.63 3.830
10 53W 002c galaxy sp+bar 0.273000 19.81 3.887
11 [KCW99] 02 QSO 2.381000 23.31 4.499
12 53W 002e galaxy sp+comp 0.528000 20.53 4.606

NED objects within 10′ from 53W 003 with redshifts available.

References

Arp, 1999, ApJ, 525, 594, “The Distribution of High-Redshift (z>~2) Quasars near Active Galaxies”

Keel et al., 1999, AJ, 118, 2547, “Evidence for Large-Scale Structure at z ~ 2.4 from Lya Imaging”

Pascarelle et al., 1998, AJ, 116, 2659, “Compact Lyalpha-emitting Candidates at Z ~= 2.4 in Deep Medium-Band Hubble Space Telescope WFPC2 Images”

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