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Astron. Astrophys. 328, L17-L20 (1997)

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4. Optical objects near the BL LAC and the bright quasar

Fig. 2 shows a [FORMULA] region around the BL Lac pictured in the X-ray map of Fig. 1. The optical image in Fig. 2 is from the digitized 103a-E Palomar Sky Survey plate. There is a BSO [FORMULA] N and another BSO [FORMULA] S. They are likely to be quasars and it would be important to find out what their redshifts are - presumably higher than the BL Lac.

[FIGURE] Fig. 2. Digitized red Palomar Sky Survey of [FORMULA] area around the BL Lac object in Fig. 1 (here #1). Objects #2 and #3 are blue stellar objects (BSO's).

Fig. 3 shows a [FORMULA] region around the strong X-ray quasar. The BSO immediately NW, #2, appears, on the 103a-O Sky Survey, to be connected to the quasar by a thin, faint filament. This should be checked with deeper images and the spectrum of the BSO obtained. Objects #3 and #4 appear to be red and slightly extended but because of their exact alignment their spectra would also be interesting. Positions accurate to about [FORMULA] and approximate apparent magnitudes and colors of these new candidates are given in Table 1.

[FIGURE] Fig. 3. Digitized red Sky Survey of [FORMULA] area around the quasar PG1216+069 in Fig. 1 (here #1). Object #2 is a BSO possibly connected to the quasar by a filament on the blue print. Objects #3 and #4 appear to be red, non-stellar objects.

[TABLE]

Table 1. Objects near the BL Lac object and the quasar.


An X-ray source only [FORMULA] from the [FORMULA] quasar was identified as MSS 1217.0 +0700 (Stocke et al. 1991). Its position is shown by a plus sign in Fig. 1. It was identified as a Sey 1 of V = 16.3 mag. and z =.080. It was not registered by the ROSAT exposure and the identification should be further checked (see Arp 1997a).

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© European Southern Observatory (ESO) 1997

Online publication: March 26, 1998

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