A ring galaxy at z=1 lensed by the cluster Abell 370

G. Soucail; J. P. Kneib; J. Bezecourt; L. Metcalfe; B. Altieri; J. F. Le Borgne

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A ring galaxy at z=1 lensed by the cluster Abell 370

G. Soucail·J. P. Kneib·J. Bezecourt·L. Metcalfe·B. Altieri·J. F. Le Borgne

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Abstract

We present a study of a very peculiar object found in the field of the cluster-lens Abell 370. This object displays, in HST imaging, a spectacular morphology comparable to nearby ring-galaxies. From spectroscopic observations at the CFHT, we measured a redshift of $z=1.062$ based on the identification of [O ii] 3727 Åand [Ne v] 3426 Åemission lines. These emission lines are typical of starburst galaxies hosting a central active nucleus and are in good agreement with the assumption that this object is a ring-galaxy. This object is also detected with ISO in the LW2 and LW3 filters, and the mid Infra-Red (MIR) flux ratio favors a Seyfert 1 type. The shape of the ring is gravitationally distorted by the cluster-lens, and most particularly by a nearby cluster elliptical galaxy. Using the cluster mass model, we can compute its intrinsic shape. Requiring that the outer ring follows an ellipse we put constraints on the M/L ratio of the nearby galaxy and derive a magnification factor of 2.5 $\pm$ 0.2. The absolute luminosities of the source are then $L_B = 1.3 \ 10^{12} L_{B \odot}$ and $ν$ L$_ν\simeq 4. 10^{10}$ L$_\odot$ in the mid-IR.

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G. Soucail, J. P. Kneib, J. Bezecourt, L. Metcalfe, B. Altieri, J. F. Le Borgne. 1999-01-26. A ring galaxy at z=1 lensed by the cluster Abell 370. https://arxiv.org/abs/astro-ph/9901123

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