XMM-Newton observations of the BL Lac MS0205.7+3509: a dense, low-metallicity absorber

(10) University of Alaska); 11) ((1) University of Copenhagen; 2); (2) University of Leicester; (3) NUI Dublin; (4) NASA-GSFC; 5); (5) USRA; (6) Cork IT; (7) University of Maryland

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XMM-Newton observations of the BL Lac MS0205.7+3509: a dense, low-metallicity absorber

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arxiv astro-ph/0402105 v1 pith:FYLBJPGM submitted 2004-02-04 astro-ph

D. Watson (1 , 2) , B. McBreen (3) , L. Hanlon (3) , J. N. Reeves (4 , 5) , N. Smith (6) , E. Perlman (7

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8) J. Stocke (9) T. A. Rector (10 11) ((1) University of Copenhagen (2) University of Leicester (3) NUI Dublin (4) NASA-GSFC (5) USRA (6) Cork IT (7) University of Maryland (8) Johns Hopkins (9) University of Colorado (10) University of Alaska)

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The high-frequency-peaked BL Lac, MS0205.7+3509 was observed twice with XMM-Newton. Both X-ray spectra are synchrotron-dominated, with mean 0.2--10keV fluxes of 2.80+/-0.01 and 3.34+/-0.02 E-12 erg/cm^2/s. The X-ray spectra are well fit by a power-law with absorption above the Galactic value, however no absorption edges are detected, implying a low metallicity absorber (Z_\sun = 0.04(+0.03)(-0.01)) or an absorber with redshift above one (best-fit z=2.1 for an absorber with solar abundances). In either case the absorbing column density must be ~9E21 cm^-2. A new optical spectrum is presented, with a MgII absorption doublet detected at z=0.351, but no other significant features. The optical spectrum shows little reddening, implying a low dust to gas ratio in the absorber. MS0205.7+3509 must therefore be viewed through a high column density, low-metallicity gas cloud, probably at z=0.351 and associated with the galaxy that has been shown to be within ~2" of the BL Lac.

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