2008A&A...477..513F


Query : 2008A&A...477..513F

2008A&A...477..513F - Astronomy and Astrophysics, volume 477, 513-516 (2008/1-2)

Redshift limits of BL Lacertae objects from optical spectroscopy.

FINKE J.D., SHIELDS J.C., BOETTCHER M. and BASU S.

Abstract (from CDS):

BL Lacertae objects have been the targets for numerous recent multiwavelength campaigns, continuum spectral variability studies, and theoretical spectral and variability modeling. A meaningful interpretation of the results of such studies requires a reliable knowledge of the objects' redshifts; however, the redshifts for many are still unknown or uncertain. Therefore, we hope to determine or constrain the redshifts of six BL Lac objects with unknown or poorly known redshifts. Observations were made of these objects with the MDM 2.4m Hiltner telescope. Although no spectral features were detected, and thus no redshifts could be measured, lower redshift limits were assigned to the objects based on the expected equivalent widths of absorption features in their host galaxies. Redshifts were also estimated for some objects by assuming the host galaxies are standard candles and using host galaxy apparent magnitudes taken from the literature. The commonly used redshift of z=0.102 for 1219+285 is almost certainly wrong, while the redshifts of the other objects studied remain undetermined.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: general - galaxies: distances and redshifts

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 845 1
2 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 14.17 14.27   ~ 1223 1
3 ACO 950 ClG 10 14 39 +49 49.1           ~ 17 1
4 6C 101157+494057 BLL 10 15 04.1396533776 +49 26 00.706055496   16.56 16.15 14.58   ~ 332 2
5 7C 1055+5644 BLL 10 58 37.7276569824 +56 28 11.207405028   16.80 16.31 14.58   ~ 187 2
6 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 819 1
7 QSO B1426+428 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 483 2
8 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2143 1

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2022.10.02-02:57:35

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