Científicos chilenos

Señor Director:

En la edición de "El Mercurio" del 2 de diciembre se menciona el descubrimiento de la "Estructura más grande del Universo" por parte de un equipo de la Universidad de Central Lancashire (UK). Dos de los seis científicos involucrados en dicha investigación son astrónomos de la Universidad de Chile, ambos miembros del Anillo de Cosmología de dicha casa de estudios Un video del popular Canal de Ciencia "Sixty-Symbols" de Youtube, titulado "The largest thing in the universe", describe y discute este trabajo en forma didáctica y entretenida. Más de 200 mil personas han visto este video.

Chile está presente entre los récords que ha batido la ciencia astronómica en los últimos 12 meses.

Luis Campusano Brown
Universidad de Chile 
Anillo Conicyt de Cosmología

A structure in the early universe at z ~ 1.3 that exceeds the homogeneity scale of the R-W concordance cosmology

Roger G. Clowes, Kathryn A. Harris, Srinivasan Raghunathan, Luis E. Campusano, Ilona K. Soechting, Matthew J. Graham

(Submitted on 27 Nov 2012)

http://arxiv.org/pdf/1211.6256v1.pdf

A Large Quasar Group (LQG) of particularly large size and high membership has been identified in the DR7QSO catalogue of the Sloan Digital Sky Survey. It has characteristic size (volume^1/3) ~ 500 Mpc (proper size, present epoch), longest dimension ~ 1240 Mpc, membership of 73 quasars, and mean redshift <z> = 1.27. In terms of both size and membership it is the most extreme LQG found in the DR7QSO catalogue for the redshift range 1.0 <= z <= 1.8 of our current investigation. Its location on the sky is ~ 8.8 deg north (~ 615 Mpc projected) of the Clowes & Campusano LQG at the same redshift, <z> = 1.28, which is itself one of the more extreme examples. Their boundaries approach to within ~ 2 deg (~ 140 Mpc projected). This new, huge LQG appears to be the largest structure currently known in the early universe. Its size suggests incompatibility with the Yadav et al. scale of homogeneity for the concordance cosmology, and thus challenges the assumption of the cosmological principle.

Comments:	Accepted for publication in Monthly Notices of the Royal Astronomical Society. 9 pages, 3 figures
Subjects:	Cosmology and Extragalactic Astrophysics (astro-ph.CO)
Cite as:	arXiv:1211.6256 [astro-ph.CO]
Científicos chilenos    Señor Director: En la edición de "El Mercurio" del 2 de diciembre se menciona el descubrimiento de la "Estructura más grande del Universo" por parte de un equipo de la Universidad de Central Lancashire (UK). Dos de los seis científicos involucrados en dicha investigación son astrónomos de la Universidad de Chile, ambos miembros del Anillo de Cosmología de dicha casa de estudios Un video del popular Canal de Ciencia "Sixty-Symbols" de Youtube, titulado "The largest thing in the universe", describe y discute este trabajo en forma didáctica y entretenida. Más de 200 mil personas han visto este video. Chile está presente entre los récords que ha batido la ciencia astronómica en los últimos 12 meses. Luis Campusano Brown Universidad de Chile  Anillo Conicyt de Cosmología A structure in the early universe at z ~ 1.3 that exceeds the homogeneity scale of the R-W concordance cosmology Roger G. Clowes, Kathryn A. Harris, Srinivasan Raghunathan, Luis E. Campusano, Ilona K. Soechting, Matthew J. Graham (Submitted on 27 Nov 2012) http://arxiv.org/pdf/1211.6256v1.pdf A Large Quasar Group (LQG) of particularly large size and high membership has been identified in the DR7QSO catalogue of the Sloan Digital Sky Survey. It has characteristic size (volume^1/3) ~ 500 Mpc (proper size, present epoch), longest dimension ~ 1240 Mpc, membership of 73 quasars, and mean redshift <z> = 1.27. In terms of both size and membership it is the most extreme LQG found in the DR7QSO catalogue for the redshift range 1.0 <= z <= 1.8 of our current investigation. Its location on the sky is ~ 8.8 deg north (~ 615 Mpc projected) of the Clowes & Campusano LQG at the same redshift, <z> = 1.28, which is itself one of the more extreme examples. Their boundaries approach to within ~ 2 deg (~ 140 Mpc projected). This new, huge LQG appears to be the largest structure currently known in the early universe. Its size suggests incompatibility with the Yadav et al. scale of homogeneity for the concordance cosmology, and thus challenges the assumption of the cosmological principle. Comments: Accepted for publication in Monthly Notices of the Royal Astronomical Society. 9 pages, 3 figures Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO) Cite as: arXiv:1211.6256 [astro-ph.CO]   (or arXiv:1211.6256v1 [astro-ph.CO] for this version) Roger G. Clowes,1⋆ Kathryn A. Harris,1 Srinivasan Raghunathan,1,2† Luis E. Campusano,2 Ilona K. Söchting3 and Matthew J. Graham4 1 Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE 2 Observatorio Astronómico Cerro Calán, Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile 3 Astrophysics, Denys Wilkinson Building, Keble Road, University of Oxford, Oxford OX1 3RH 4 California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA	(or arXiv:1211.6256v1 [astro-ph.CO] for this version)

Roger G. Clowes,1⋆ Kathryn A. Harris,1 Srinivasan Raghunathan,1,2†

Luis E. Campusano,2 Ilona K. Söchting3 and Matthew J. Graham4

1 Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE

2 Observatorio Astronómico Cerro Calán, Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile

3 Astrophysics, Denys Wilkinson Building, Keble Road, University of Oxford, Oxford OX1 3RH

4 California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA