2004A&A...418..459W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.23CEST00:55:06

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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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0205+350 BLL 02 08 38.1632218391 +35 23 12.802507619     19.24 18.8   ~ 89 0
2 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1399 2
3 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 992 0
4 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 794 2
5 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 609 0
6 7C 1308+3236 BLL 13 10 28.66387 +32 20 43.7831   15.61 15.24 17.91   ~ 754 1
7 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 380 1

    Equat.    Gal    SGal    Ecl

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2020.10.23-00:55:06

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