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Deep HST Imaging of a Galaxy Cluster at z = 2.40

  • Rogier A. Windhorst (a1), Sam M. Pascarelle (a1) and William C. Keel (a2)

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We present a 67-orbit HST/WFPC2 exposure on the weak radio galaxy 53W002 at z=2.390 and its surrounding cluster. Color Plate 1 shows 12 orbits in IF 814W & VF 606W , and 24 in BF 450W . Potential cluster members were identified through 15 orbits in F410M, optimized for narrow-band searches for compact Lyα objects at z≃2.4 (P96), and confirmed through spectroscopy (W91, P96); 16 candidates were found with significant narrow-band emission in F410M: 4 out of 5 had a confirming MMT spectroscopic redshift at z≃2.40 (P96). All are located within 60″ from 53W002, or ∼ 0.24h –1 100 Mpc (qo =0.5) at z ≃2.4, the physical scale of a group or small galaxy cluster. One object contains a weak (variable) AGN, another is a merger with two companions. Their underlying young stellar population is very compact, with rh.l. ≃0.2″ (≃ 0.8h –1 100 kpc), and considerably fainter than the L∗-value at z∼2.4, implying sub-galactic sized objects. These results may explain why ground-based Lya searches for PG's have been largely unsuccessful. The narrow-line galaxy 53W002 was imaged in the PC at ∼0.07″ FWHM (WK95, see also W94). Its AGN component is ≤ 20±4% of the total continuum, surrounded by an extended r 1/4-envelope with rh.l. ≃1.1″ (4.3 kpc), and has an SED of ∼0.3 Gyr in the center to ∼0.5-1.0 Gyr at ∼4 kpc. A one-sided cloud is seen ∼1.8 kpc West, ∼0.3 mag bluer than the SED, aligned with the radio source and its Ly-α cloud, presumably weak scattered AGN light, and/or jet-induced star-formation.

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References

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Pascarelle, S. M., et al. 1996, ApJL, 456, (Jan. 1; P96); Also: Nature, subm.
Windhorst, R. A., et al. 1991, ApJ, 380, 362 (W91)
Windhorst, R. A., et al. 1994, ApJ, 435, 577 (W94); Also: ApJL, 400, L1
Windhorst, R. A., Keel, W. C., 1995, ApJL, submitted (WK95)

Deep HST Imaging of a Galaxy Cluster at z = 2.40

  • Rogier A. Windhorst (a1), Sam M. Pascarelle (a1) and William C. Keel (a2)

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