Fig. 4
BL Lac object MH 2136-428. Left panel: ESO/DSS field that shows the galaxy NGC 7097 that is possibly associated to the Ca II absorption system. Right panel: HST+ACS image (integration time is 780 s; f = F625W). The image clearly shows the presence of a faint galaxy at 3.2′′ NW from the BL Lac (labelled as G1). The target is unresolved and the faint galaxy (G1) at ~3.2′′ NW is likely a background object.
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