Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240

PKS 1424+240 is a BL-Lac blazar with unknown redshift detected at high-energy gamma rays by Fermi-LAT with a hard spectrum. It was first detected at very-high-energy by VERITAS and latter confirmed by MAGIC. Attempts to find limits on its redshift include three estimations by modeling gamma-ray obse...

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Publicado: 2015
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v30-July-2015_n_p_Rovero
http://hdl.handle.net/20.500.12110/paper_18248039_v30-July-2015_n_p_Rovero
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_18248039_v30-July-2015_n_p_Rovero
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spelling paper:paper_18248039_v30-July-2015_n_p_Rovero2023-06-08T16:29:18Z Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240 PKS 1424+240 is a BL-Lac blazar with unknown redshift detected at high-energy gamma rays by Fermi-LAT with a hard spectrum. It was first detected at very-high-energy by VERITAS and latter confirmed by MAGIC. Attempts to find limits on its redshift include three estimations by modeling gamma-ray observations, and one obtained by analyzing Lyb and Lyg absorption lines observed in the far-UV spectra (from HST/COS) caused by absorbing gas along the line of sight. They allowed to constrain the redshift range to 0:6<z<1:19, which places PKS 1424+240 in the very interesting condition to be one of the few candidates to be the most distant blazars detected at very-high-energy gamma rays. Redshift determination of BL-Lac objects are difficult to achieve. We have found that redshift of blazars can be determined by its association to a galaxy group or cluster. To explore this possibility for PKS 1424+240, we have carried out spectroscopic measurements with the Gemini North telescope of galaxies in its field of view. In this work we present the optical spectrum of PKS 1424+240 and show preliminary results of the blazar environment characterization. Spectroscopic redshift using the optical spectrum of PKS 1424+240 could not be determined in this work. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v30-July-2015_n_p_Rovero http://hdl.handle.net/20.500.12110/paper_18248039_v30-July-2015_n_p_Rovero
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description PKS 1424+240 is a BL-Lac blazar with unknown redshift detected at high-energy gamma rays by Fermi-LAT with a hard spectrum. It was first detected at very-high-energy by VERITAS and latter confirmed by MAGIC. Attempts to find limits on its redshift include three estimations by modeling gamma-ray observations, and one obtained by analyzing Lyb and Lyg absorption lines observed in the far-UV spectra (from HST/COS) caused by absorbing gas along the line of sight. They allowed to constrain the redshift range to 0:6<z<1:19, which places PKS 1424+240 in the very interesting condition to be one of the few candidates to be the most distant blazars detected at very-high-energy gamma rays. Redshift determination of BL-Lac objects are difficult to achieve. We have found that redshift of blazars can be determined by its association to a galaxy group or cluster. To explore this possibility for PKS 1424+240, we have carried out spectroscopic measurements with the Gemini North telescope of galaxies in its field of view. In this work we present the optical spectrum of PKS 1424+240 and show preliminary results of the blazar environment characterization. Spectroscopic redshift using the optical spectrum of PKS 1424+240 could not be determined in this work.
title Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240
spellingShingle Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240
title_short Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240
title_full Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240
title_fullStr Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240
title_full_unstemmed Redshift measurement of the BL-Lac gamma-ray blazar PKS 1424+240
title_sort redshift measurement of the bl-lac gamma-ray blazar pks 1424+240
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18248039_v30-July-2015_n_p_Rovero
http://hdl.handle.net/20.500.12110/paper_18248039_v30-July-2015_n_p_Rovero
_version_ 1768542809755746304

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