2007A&A...473L..17T


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:06:42

2007A&A...473L..17T - Astronomy and Astrophysics, volume 473, L17-19 (2007/10-3)

On the distance of PG 1553+11. A lineless BL Lacertae object active in the TeV band.

TREVES A., FALOMO R. and USLENGHI M.

Abstract (from CDS):

The redshift of PG 1553+11, a bright BL Lac object (V∼14), is still unknown. It has been recently observed in the TeV band, a fact that offers an upper limit for the redshift z<0.4. We intend to provide a lower limit for the distance of the object. We used a χ2 procedure to constrain the apparent magnitude of the host galaxy in archived HST images. Supposing that the host galaxy is typical of BL Lac objects (MR~-22.8), a lower limit to the distance can be obtained from the limit on the apparent magnitude of the host galaxy. Using the 3σ limit on the host galaxy magnitude, the redshift is found to be ≥0.25. The redshift of PG 1553+11 is probably in the range z=0.3-0.4, making this object the most distant extragalactic source so far detected in the TeV energies. We suggest that other bright BL Lac objects of unknown redshift and similar spectroscopic characteristics may be interesting targets for TeV observations.

Abstract Copyright:

Journal keyword(s): galaxies: active - BL Lacertae objects: individual: PG 1553+11 - gamma rays: observations

Simbad objects: 4

goto Full paper

goto View the reference in ADS

Number of rows : 4

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

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2007A&A...473L..17T and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-14:06:42

© Université de Strasbourg/CNRS

    • Contact