On the galaxy surrounding the BL Lacertae object MS 0205.7+3509.

Details On the galaxy surrounding the BL Lacertae object MS 0205.7+3509. On the galaxy surrounding the BL Lacertae object MS 0205.7+3509.

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..374f&link_type=abstract

Astronomy and Astrophysics, v.321, p.374-378

Astronomy and Astrophysics

Astrophysics

15

Bl Lacertae Objects, Galaxies: Individual: Ms 0205.7+3509

Scientific paper

We present high spatial resolution optical images of the BL Lac object MS 0205.7+3509 in the R filter, that allow us to discuss and clarify its anomalous properties. The source was previously claimed to be surrounded by a nebulosity de-centered with respect to the bright nucleus. In addition the host was claimed to be a disc dominated galaxy, contrary to the large majority of the hosts of BL Lacs. We find that there is a companion galaxy at about 2" from MS 0205.7+3509, which is responsible for many of the anomalous properties reported for this source. The observations are discussed in the context of the microlensing hypothesis for BL Lacs.

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