2014A&A...570A.126L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:25:00

2014A&A...570A.126L - Astronomy and Astrophysics, volume 570A, 126-126 (2014/10-1)

Spectroscopy of BL Lacertae objects of extraordinary luminosity.

LANDONI M., FALOMO R., TREVES A. and SBARUFATTI B.

Abstract (from CDS):

We aim to determine the redshift (or stringent lower limits) of a number of bright BL Lacs objects. We secured optical and near-infrared medium-resolution spectra of four bright BL Lac objects of unknown redshift using the spectrograph X-Shooter at the ESO-VLT. In spite of the high quality of the spectra and the extended spectral range of the observations, we have not detected intrisic spectral features for these sources. However, we are able to provide strigent lower limits to their redshift. In particular, for the two TeV sources PG 1553+113 and H 1722+119, we infer z>0.30 and z>0.35 respectively. We also detect an intervening CaII absorption doublet in the spectrum of MH 2136-428 that is ascribed to the halo of a nearby giant elliptical galaxy at a projected distance of ∼100kpc. Under the hypothesis that all BL Lacs are hosted by a luminous bulge-dominated galaxies, the spectroscopic observations of bright BL Lacs presently indicate that these objects are likely sources with extremely beamed nuclear emission. We present simulations to show under which circumstances it is possible to probe this hypothesis from the detection of very weak absorptions using the next generation of extremely large optical telescopes.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: general - instrumentation: spectrographs - cosmology: observations

VizieR on-line data: <Available at CDS (J/A+A/570/A126): pks2254.dat h1722.dat mh2136.dat pg1553.dat>

CDS comments: Fig.4 galaxy G1 not identified.

Simbad objects: 6

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Number of rows : 6

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 B0048-09 BLL 00 50 41.31738756 -09 29 05.2102688 16.74 16.39 16.22 16.14   ~ 419 2
2 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 420 1
3 QSO B1722+119 BLL 17 25 04.34087 +11 52 15.4688   16.29 15.77 14.45   ~ 164 1
4 QSO B2136-428 BLL 21 39 24.1734381106 -42 35 20.466757777   16.50 16.2 15.7   ~ 55 0
5 NGC 7097 GiP 21 40 12.883 -42 32 21.81   12.66 11.71 11.21   ~ 112 0
6 QSO B2254-204 BLL 22 56 41.2069942492 -20 11 40.516352977   19.04 18.5 18.18   ~ 69 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:25:00

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