2016A&A...589A..92R


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET00:58:34

2016A&A...589A..92R - Astronomy and Astrophysics, volume 589A, 92-92 (2016/5-1)

The BL-Lacertae gamma-ray blazar PKS 1424+240 associated with a group of galaxies at z = 0.6010.

ROVERO A.C., MURIEL H., DONZELLI C. and PICHEL A.

Abstract (from CDS):

Context. PKS 1424+240 is a BL-Lac blazar with unknown redshift that was detected at high-energy gamma rays by Fermi-LAT with a hard spectrum. At very high energy (VHE), it was first detected by VERITAS and later confirmed by MAGIC. Its spectral energy distribution is highly attenuated at VHE gamma rays, which is coherent with distant sources. Several estimations enabled the redshift to be constrained to the range 0.6<z<1.3. These results place PKS 1424+240 in the very interesting condition of being probably the most distant blazar that has been detected at VHE. The ambiguity in the redshift is still large enough to prevent precise studies of the extragalatic background light and the intrinsic blazar spectrum.
Aims. Given the difficulty of measuring spectroscopic redshifts for BL-Lac objects directly, we aim to establish a reliable redshift value for this blazar by finding its host group of galaxies.
Methods. Elliptical galaxies are associated with groups, and BL-Lac objects are typically hosted by them, so we decided to search for the host group of the blazar. For this, we performed optical spectroscopic observations of thirty objects in the field of view of PKS 1424+240 using the Gemini Multi-Object Spectrograph. After analysing the data for groups, we evaluated the probability of finding groups of galaxies by chance around the position of PKS 1424+240, using a deep catalogue of groups. We also used photometric data from the SDSS catalogue to analyse the red sequence of the proposed blazar host group Results. We found a new group of galaxies with eight members at z=0.6010±0.003, a virial radius of Rvir=1.53Mpc, and a velocity dispersion of σv=813±187km/s. The photometric study indicates that more members are probably populating this previously uncatalogued group of galaxies. The probability of PKS 1424+240 being a member of this group was found to be >=98%.
Conclusions. The new group of galaxies found at z=0.6010±0.003 is very likely hosting PKS 1424+240.

Abstract Copyright: © ESO, 2016

Journal keyword(s): BL Lacertae objects: individual: PKS 1424+240 - galaxies: distances and redshifts - galaxies: groups: general

CDS comments: Table 1 objects SDSS

Simbad objects: 32

goto Full paper

goto View the reference in ADS

Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2204 0
2 SDSS J142652.51+234747.6 G 14 26 52.519 +23 47 47.60           ~ 1 0
3 SDSS J142653.77+234718.3 G 14 26 53.778 +23 47 18.38           ~ 1 0
4 SDSS J142654.63+235032.5 G 14 26 54.637 +23 50 32.59           ~ 1 0
5 SDSS J142654.75+234847.9 G 14 26 54.755 +23 48 47.97           ~ 1 0
6 SDSS J142656.35+234833.4 G 14 26 56.352 +23 48 33.43           ~ 1 0
7 SDSS J142656.36+235029.2 G 14 26 56.366 +23 50 29.21           ~ 1 0
8 SDSS J142657.54+234809.5 G 14 26 57.541 +23 48 09.59           ~ 1 0
9 SDSS J142657.96+234753.6 G 14 26 57.968 +23 47 53.62           ~ 1 0
10 SDSS J142659.03+234741.7 G 14 26 59.032 +23 47 41.76           ~ 1 0
11 SDSS J142659.39+235019.8 G 14 26 59.397 +23 50 19.86           ~ 1 0
12 SDSS J142659.55+234639.0 G 14 26 59.559 +23 46 39.02           ~ 1 0
13 SDSS J142700.35+234938.1 G 14 27 00.350 +23 49 38.19           ~ 1 0
14 7C 1424+2401 BLL 14 27 00.3918388878 +23 48 00.035406946 14.52 14.34 14.95 14.5   ~ 301 1
15 SDSS J142701.63+234833.0 G 14 27 01.631 +23 48 33.00           ~ 1 0
16 SDSS J142701.72+234630.9 G 14 27 01.7266540536 +23 46 30.937925591           ~ 2 0
17 SDSS J142701.73+234943.0 G 14 27 01.738 +23 49 43.09           ~ 1 0
18 SDSS J142703.33+234909.7 G 14 27 03.339 +23 49 09.78           ~ 1 0
19 SDSS J142703.61+234735.2 G 14 27 03.617 +23 47 35.25           ~ 1 0
20 SDSS J142704.05+234749.7 G 14 27 04.059 +23 47 49.75           ~ 1 0
21 SDSS J142705.17+234917.8 G 14 27 05.171 +23 49 17.82           ~ 1 0
22 SDSS J142706.18+234919.6 G 14 27 06.181 +23 49 19.69           ~ 1 0
23 SDSS J142706.47+234714.0 G 14 27 06.477 +23 47 14.06           ~ 1 0
24 SDSS J142709.24+235009.8 G 14 27 09.246 +23 50 09.81           ~ 1 0
25 SDSS J142710.41+234939.8 G 14 27 10.416 +23 49 39.89           ~ 1 0
26 SDSS J142710.90+234937.2 G 14 27 10.901 +23 49 37.25           ~ 1 0
27 SDSS J142711.35+234754.1 G 14 27 11.357 +23 47 54.10           ~ 1 0
28 SDSS J142711.62+234734.3 G 14 27 11.622 +23 47 34.33           ~ 1 0
29 SDSS J142712.58+234616.4 G 14 27 12.585 +23 46 16.41           ~ 1 0
30 SDSS J142712.81+234850.8 * 14 27 12.818 +23 48 50.83           ~ 1 0
31 SDSS J142714.28+234812.9 G 14 27 14.284 +23 48 12.93           ~ 2 0
32 SDSS J142714.52+235007.4 G 14 27 14.5198411991 +23 50 07.490277244           ~ 2 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2016A&A...589A..92R and select 'bookmark this link' or equivalent in the popup menu


2021.03.02-00:58:34

© Université de Strasbourg/CNRS

    • Contact