SIMBAD references

2004ApJ...608...36T - Astrophys. J., 608, 36-41 (2004/June-2)

The counterarc to MS 1512-cB58 and a companion galaxy.


Abstract (from CDS):

We present near-infrared spectra of ``A2'', the primary counterarc to the gravitationally lensed galaxy MS 1512-cB58. The spectra show redshifted Hα, [N II], [O III], and Hβ at z=2.729±0.001. We observe the same Hα/[O III] ratio as cB58, which together with the redshift confirms that A2 is indeed another image of a single background galaxy. Published lensing reconstruction reports that A2 is a magnification of the entire source, while cB58 is an image of only a part. At marginal significance, A2 shows higher line-to-continuum ratios than cB58 (by a factor of ∼2), suggesting a nonuniform ratio of young to old stars across the galaxy. We observe a second emission-line source in the slit. This object, ``W5'', is predicted to be a lensed image of another galaxy at a redshift similar to cB58. W5 is blueshifted from cB58 by ∼400 km/s and has a significantly lower Hα/[O III] ratio, confirming that it is an image of a different background galaxy in a group with cB58. The Hα emission line in W5 implies a star formation rate of 6 M/yr (H0=70 km/s/Mpc, ΩM=0.3,ΩΛ=0.7), after correcting for lensing magnification.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Galaxies: Evolution - Galaxies: High-Redshift - Galaxies: Individual: Alphanumeric: MS 1512-cB58 - Cosmology: Gravitational Lensing

Nomenclature: Fig.1: [SSB98] WN (No. W5) added.

Status at CDS:  

CDS comments: PMM 130690 is a misprint for PPM 130690.

Simbad objects: 10

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2004ApJ...608...36T and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact