SIMBAD references

1999A&A...343...81N - Astronomy and Astrophysics, volume 343, 81-85 (1999/3-1)

Discovery of a blue arc near the BL Lacertae object RGB 1745+398.

NILSSON K., TAKALO L.O., PURSIMO T., SILLANPAEAE A., HEIDT J., WAGNER S.J., LAURENT-MUEHLEISEN S.A. and BRINKMANN W.

Abstract (from CDS):

We have made a serendipitous discovery of a blue arclike structure 8" southeast of RGB 1745+398 (z=0.267) during deep imaging of X-ray and radio selected BL Lacertae candidates. The spectrum of the arc resembles that of a late-type galaxy with three spectral features ([OII] emission, MgII absorption and 4000Å break) that indicate z=1.057. We interpret the arc as a gravitationally enhanced image of a background galaxy and the observed velocity splitting of the [OII] line (350km/s) as due to its rotation, although we cannot rule out the possibility that the source consists of a pair of background galaxies. We find the host galaxy of RGB 1745+398 to be the brightest cluster member (MR=-24.9) of a moderately massive cluster that most likely provides the lensing mass. From simple considerations we obtain M∼1.3x1013M and M/LB∼60 for the central part (r<40h50–1kpc) of the cluster.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: individual: RGB 1745+398 - galaxies: clusters: general - cosmology: gravitational lensing

Nomenclature: Fig.1: [NTP99] Arc N=1, [NTP99] AN (Nos A1-A2), [NTP99] B N=1, [NTP99] GN (Nos G1-G5).

CDS comments: RGB 1745+398 is RGB J1745+398.

Simbad objects: 13

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2022.08.15-03:57:49

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