تقرير
3D Correlations in the Lyman-$\alpha$ Forest from Early DESI Data
| العنوان: | 3D Correlations in the Lyman-$\alpha$ Forest from Early DESI Data |
|---|---|
| المؤلفون: | Gordon, Calum, Cuceu, Andrei, Chaves-Montero, Jonás, Font-Ribera, Andreu, González-Morales, Alma Xochitl, Aguilar, J., Ahlen, S., Armengaud, E., Bailey, S., Bault, A., Brodzeller, A., Brooks, D., Claybaugh, T., de la Cruz, R., Dawson, K., Doel, P., Forero-Romero, J. E., Gontcho, S. Gontcho A, Guy, J., Herrera-Alcantar, H. K., Iršič, V., Karaçaylı, N. G., Kirkby, D., Landriau, M., Guillou, L. Le, Levi, M. E., de la Macorra, A., Manera, M., Martini, P., Meisner, A., Miquel, R., Montero-Camacho, P., Muñoz-Gutiérrez, A., Napolitano, L., Nie, J., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Pieri, M., Poppett, C., Prada, F., Pérez-Ràfols, I., Ramírez-Pérez, C., Ravoux, C., Rezaie, M., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Sinigaglia, F., Tan, T., Tarlé, G., Walther, M., Weaver, B. A., Yèche, C., Zhou, Z., Zou, H. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We present the first measurements of Lyman-$\alpha$ (Ly$\alpha$) forest correlations using early data from the Dark Energy Spectroscopic Instrument (DESI). We measure the auto-correlation of Ly$\alpha$ absorption using 88,509 quasars at $z>2$, and its cross-correlation with quasars using a further 147,899 tracer quasars at $z\gtrsim1.77$. Then, we fit these correlations using a 13-parameter model based on linear perturbation theory and find that it provides a good description of the data across a broad range of scales. We detect the BAO peak with a signal-to-noise ratio of $3.8\sigma$, and show that our measurements of the auto- and cross-correlations are fully-consistent with previous measurements by the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). Even though we only use here a small fraction of the final DESI dataset, our uncertainties are only a factor of 1.7 larger than those from the final eBOSS measurement. We validate the existing analysis methods of Ly$\alpha$ correlations in preparation for making a robust measurement of the BAO scale with the first year of DESI data. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2308.10950 |
| رقم الأكسشن: | edsarx.2308.10950 |
| قاعدة البيانات: | arXiv |
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