SIMBAD references

2004A&A...418..459W - Astronomy and Astrophysics, volume 418, 459-463 (2004/5-1)

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

WATSON D., McBREEN B., HANLON L., REEVES J.N., SMITH N., PERLMAN E., STOCKE J. and RECTOR T.A.

Abstract (from CDS):

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±0.02x10–12erg/cm2/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=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 ∼9x1021/cm2. 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.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: individual: MS0205.7+3509 - galaxies: active - X-rays: galaxies

Simbad objects: 7

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2019.09.17-01:29:47

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