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Abstract:

Context. The BL-Lac blazar PKS 0447-439 is one of the brightest HE gamma-ray sources that were first detected by Fermi-LAT. It was also detected by H.E.S.S. at VHE gamma-rays, which allowed constraining the redshift of PKS 0447-439 by considering the attenuation caused by gamma-ray interactions with ambient photons in the extragalactic background light (EBL). This constraint agreed with color-magnitude and spectroscopic redshift constraints (0.179 < z < 0.56). Recently, however, a much higher redshift was proposed for this blazar (z > 1.2). This value was debated because if true, it would imply either that the relevant absorption processes of gamma-rays are not well understood or that the EBL is dramatically different from what is believed today. This high redshift was not confirmed by three independent new spectroscopic observations at high signal-to-noise ratios. The scenario is clear evidence of the difficulties in estimating the redshift of BL-Lac objects, whose optical spectra are typically featureless. Neither of the estimated redshifts for PKS 0447-439 are confirmed as yet. Aims. Given that BL-Lac are typically hosted by elliptical galaxies, which in turn are associated with groups, we aim to find the host group of galaxies of PKS 0447-439. The ultimate goal is to estimate a redshift for this blazar. Methods. Spectra of twenty-one objects in the field of view of PKS 0447-439 were obtained with the Gemini Multi-Object Spectrograph. Based on the redshifts and coordinates of these galaxies, we searched for groups of galaxies. Using a deep catalog of groups, we studied the probability of finding by chance a group of galaxies in the line of sight of PKS 0447-439. Results. We identified a group of galaxies that was not previously cataloged at z = 0.343 with seven members, a virial radius of 0.42 Mpc, and a velocity dispersion of 622 km s-1.We found that the probability of the host galaxy of PKS 0447-439 to be a member of the new group is >∼97%. Therefore, we propose to adopt z = 0.343 ± 0.002 as the most likely redshift for PKS 0447-439. © ESO 2015.

Registro:

Documento: Artículo
Título:The BL-Lac gamma-ray blazar PKS 0447-439 as a probable member of a group of galaxies at z = 0.343
Autor:Muriel, H.; Donzelli, C.; Rovero, A.C.; Pichel, A.
Filiación:Instituto de Astronomía Teórica y Experimental (IATE, CONICET-UNC), Laprida 854, Córdoba, X5000BGR, Argentina
Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, Córdoba, X5000BGR, Argentina
Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), Av. Inte. Güiraldes 2620, Buenos Aires, C1428ZAA, Argentina
Palabras clave:BL Lacertae objects; Distances and redshifts - galaxies; General; Groups; Individual; PKS 0447-439 - galaxies; Galaxies; Signal to noise ratio; BL Lacertae objects; Distances and redshifts; General; Groups; Individual; Gamma rays
Año:2015
Volumen:574
DOI: http://dx.doi.org/10.1051/0004-6361/201425050
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v574_n_p_Muriel

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Citas:

---------- APA ----------
Muriel, H., Donzelli, C., Rovero, A.C. & Pichel, A. (2015) . The BL-Lac gamma-ray blazar PKS 0447-439 as a probable member of a group of galaxies at z = 0.343. Astronomy and Astrophysics, 574.
http://dx.doi.org/10.1051/0004-6361/201425050
---------- CHICAGO ----------
Muriel, H., Donzelli, C., Rovero, A.C., Pichel, A. "The BL-Lac gamma-ray blazar PKS 0447-439 as a probable member of a group of galaxies at z = 0.343" . Astronomy and Astrophysics 574 (2015).
http://dx.doi.org/10.1051/0004-6361/201425050
---------- MLA ----------
Muriel, H., Donzelli, C., Rovero, A.C., Pichel, A. "The BL-Lac gamma-ray blazar PKS 0447-439 as a probable member of a group of galaxies at z = 0.343" . Astronomy and Astrophysics, vol. 574, 2015.
http://dx.doi.org/10.1051/0004-6361/201425050
---------- VANCOUVER ----------
Muriel, H., Donzelli, C., Rovero, A.C., Pichel, A. The BL-Lac gamma-ray blazar PKS 0447-439 as a probable member of a group of galaxies at z = 0.343. Astron. Astrophys. 2015;574.
http://dx.doi.org/10.1051/0004-6361/201425050