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XMM-Newton observations of the BL Lac MS0205.7+3509: a dense, low-metallicity absorber | | D. Watson
; B. McBreen
; L. Hanlon
; J. N. Reeves
; N. Smith
; E. Perlman
; J. Stocke
; T. A. Rector ( University of Copenhagen
; University of Leicester
; NUI Dublin
; NASA-GSFC
; USRA
; Cork IT
; University of Maryland
; Johns Hopkins
; University of Colorado
; | | Date: |
4 Feb 2004 | | Journal: | Astron.Astrophys. 418 (2004) 459-463 | | Subject: | astro-ph | | Affiliation: | 1,2), B. McBreen , L. Hanlon , J. N. Reeves (4,5), N. Smith , E. Perlman (7,8), J. Stocke , T. A. Rector (10,11) ( University of Copenhagen, University of Leicester, NUI Dublin, NASA-GSFC, USRA, Cork IT, University of Maryland, Johns Hopkins, U | | Abstract: | 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. | | Source: | arXiv, astro-ph/0402105 | | Services: | Forum | Review | PDF | Favorites | |
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