Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/7619COMPARTIR / EXPORTAR:
 SHARE
 CORE
BASE
|
|
| Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
| Título: | Measuring baryon acoustic oscillations along the line of sight with photometric redshifts: the PAU survey |
Autor: | Benítez, Narciso CSIC ORCID; Gaztañaga, Enrique CSIC ORCID; Castander, Francisco J. CSIC ORCID; Moles, Mariano CSIC; Crocce, Martín CSIC ORCID; Fernández-Soto, Alberto CSIC ORCID CVN ; Fosalba, Pablo CSIC ORCID; Cristóbal-Hornillos, David CSIC; Fernández, Enrique; Fernández Sopuerta, Carlos ; García-Bellido, Juan CSIC ORCID; Lobo, J. Alberto CSIC; Sánchez, Sebastián F. CSIC ORCID; Varela, Jesús CSIC; De Vicente, Juan | Palabras clave: | Large-scale structure of the universe Cosmological parameters Physical Cosmology Physics of the Accelerating Universe (PAU) |
Fecha de publicación: | 9-ene-2009 | Editor: | American Astronomical Society | Citación: | Astrophysical Journal 691(1): 241-260 (2009) | Resumen: | Baryon Acoustic Oscillations (BAOs) provide a "standard ruler" of known physical length, making it one of the most promising probes of the nature of dark energy (DE). The detection of BAOs as an excess of power in the galaxy distribution at a certain scale requires measuring galaxy positions and redshifts. "Transversal" (or "angular") BAOs measure the angular size of this scale projected in the sky and provide information about the angular distance. "Line-of-sight" (or "radial") BAOs require very precise redshifts, but provide a direct measurement of the Hubble parameter at different redshifts, a more sensitive probe of DE. The main goal of this paper is to show that it is possible to obtain photometric redshifts with enough precision (σz) to measure BAOs along the line of sight. There is a fundamental limitation as to how much one can improve the BAO measurement by reducing σz . We show that σz ~ 0.003(1 + z) is sufficient: a much better precision will produce an oversampling of the BAO peak without a significant improvement on its detection, while a much worse precision will result in the effective loss of the radial information. This precision in redshift can be achieved for bright, red galaxies, featuring a prominent 4000 Å break, by using a filter system comprising about 40 filters, each with a width close to 100 Å, covering the wavelength range from ~4000 to ~8000 Å, supplemented by two broad-band filters similar to the Sloan Digital Sky Survey u and z bands. We describe the practical implementation of this idea, a new galaxy survey project, Physics of the Accelerating Universe (PAU): http://www.ice.cat/pau, to be carried out with a telescope/camera combination with an etendue about 20 m2 deg2, equivalent to a 2 m telescope equipped with a 6 deg2 field of view camera, and covering 8000 deg2 in the sky in four years. We expect to measure positions and redshifts for over 14 million red, early-type galaxies with L > L* and i(AB) <~ 22.5 in the redshift interval 0.1 < z < 0.9, with a precision σz < 0.003(1 + z). This population has a number density n >~ 10–3 Mpc–3 h3 galaxies within the 9 Gpc3 h–3 volume to be sampled by our survey, ensuring that the error in the determination of the BAO scale is not limited by shot noise. By itself, such a survey will deliver precisions of order 5% in the dark-energy equation of state parameter w, if assumed constant, and can determine its time derivative when combined with future cosmic microwave background measurements. In addition, PAU will yield high-quality redshift and low-resolution spectroscopy for hundreds of millions of other galaxies, including a very significant high-redshift population. The data set produced by this survey will have a unique legacy value, allowing a wide range of astrophysical studies. | Descripción: | Benítez, Narciso et al. arXiv:0807.0535v2 |
Versión del editor: | http://dx.doi.org/10.1088/0004-637X/691/1/241 | URI: | http://hdl.handle.net/10261/7619 | DOI: | 10.1088/0004-637X/691/1/241 | ISSN: | 0004-637X |
| Aparece en las colecciones: | (CFMAC-IFF) Artículos (IFCA) Artículos (ICE) Artículos (IAA) Artículos (IFT) Artículos |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| Measuring baryon.pdf | 1,65 MB | Adobe PDF |  Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
137
checked on 02-abr-2024
WEB OF SCIENCETM
Citations
131
checked on 29-feb-2024
Page view(s)
500
checked on 19-abr-2024
Download(s)
302
checked on 19-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.