Abel 1835 IR1916

In Astronomy, Abell 1835 IR1916 is a hypothetical object located in the direction of the Galaxy cluster Abell 1835. Its discovery on a stereotype in the field Infrarouge of the Broad Very Telescopes (VLT) southern European Observatoire (ESO) was announced in March 2004. The spectroscopic study of the object could not be realized because of its very weak glare, but its Décalage towards the red was estimated by photometric methods at a value of 10. The method used was a search for an excess of luminous Flow corresponding to the Emission line Lyman-alpha. Such a line had been observed with a Wavelength included/understood enre 1,315 and 1,365 Micron S, to compare with the wavelength at rest of the line Lyman-alpha, of 1215 Nm. This relationship from approximately 11 between the wavelengths was interpreted as being due to a shift towards the red of 10.

At the time of the advertisement of the discovery, that made Abell 1835 IR1916 the astrophysical object most remote of the universe (except for the cosmological diffuse Fond, but it is not a question of an object strictly speaking; to see the article in question for more details). The fact that such a remote object can nevertheless be visible was then explained by the fact that its quasi alignment with a galaxy cluster of foreground allowed an amplification of its luminosity by the phenomenon of gravitational Lentille. It was besides with an aim of detecting distance objects amplified by gravitational lens that a deep stereotype of this galaxy cluster had been carried out. The object remained nevertheless extremely not very luminous, with the limit of the threshold of detection permitted by the instruments.

The first attempt undertaken thereafter for réobserver this object, semi-2004, could not confirm the detection of this one. A discussion was followed from there where the methods used by the various groups were confronted. No target detection this was made in the visible Domaine. Later analyzes did not clarify the situation, the object being proven invisible, in particular on a deeper stereotype of the Télescope Gemini in the same field wavelength as that of the initial observations of the VLT, but without invalidating the results of the initial analysis.

The object from now on is regarded as a variable object whose nature remains unknown. He is not regarded any more as a solid candidate for an object of very great shift towards the red by the authors of his découverte^,.

External bond

VLT Smashes the Record off the Farthest Known Galaxy Press release of the ESO announcing the discovery of the object (March 1st, 2004), with addition of the 30 nobembre 2005 questioning its true nature.

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