The XXL survey: First results and future

Pierre, M and Adami, C and Birkinshaw, M and Chiappetti, L and Ettori, S and Evrard, A and Faccioli, L and Gastaldello, F and Giles, P and Horellou, C and Iovino, A and Koulouridis, E and Lidman, C and Le Brun, A and Maughan, B and Maurogordato, S and McCarthy, I and Miyazaki, S and Pacaud, F and Paltani, S and Plionis, M and Reiprich, T and Sadibekova, T and Smolcic, V and Snowden, S and Surdej, J and Tsirou, M and Vignali, C and Willis, J and Alis, S and Altieri, B and Baran, N and Benoist, C and Bongiorno, A and Bremer, M and Butler, A and Cappi, A and Caretta, C and Ciliegi, P and Clerc, N and Corasaniti, P S and Coupon, J and Delhaize, J and Delvecchio, I and Democles, J and Desai, Shantanu and Devriendt, J and Dubois, Y and Eckert, D and Elyiv, A and Farahi, A and Ferraril, C and Fotopoulou, S and Forman, W and Georgantopoulos, I and Guglielmo, V and Huynh, M and Jerlin, N and Jones, Ch and Lavoie, S and Le Fevre, J P and Lieu, M and Kilbinger, M and MaruIli, F and Mantz, A and McGee, S and Melin, J B and Melnyk, O and Moscardini, L and Novak, M and Piconcelli, E and Poggianti, B and Pomarede, D and Pompei, E and Ponman, T and Ramos Ceja, M E and Rana, P and Rapetti, D and Raychaudhury, S and Ricci, M and Rottgering, H and Sahlen, M and Sauvageot, J L and Schimd, C and Sereno, M and Smith, G P and Umetsu, K and Valageas, P and Valotti, A and Valtchanov, I and Veropalumbo, A and Ascaso, B and Barnes, D and De Petris, M and Durret, F and Donahue, M and Ithana, M and Jarvis, M and Johnston-Hollitt, M and Kalfountzou, E and Kay, S and La Franca, F and Okabe, N and Muzzin, A and Rettura, A and Ricci, F and Ridl, J and Risaliti, G and Takizawa, M and Thomas, P and Truong, N (2017) The XXL survey: First results and future. Astronomische Nachrichten, 338 (2-3). pp. 334-341. ISSN 0004-6337

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Abstract

The XXL survey currently covers two 25 deg(2) patches with XMM observations of similar to 10 ks. We summarize the scientific results associated with the first release of the XXL dataset, which occurred in mid-2016. We review several arguments for increasing the survey depth to 40 ks during the next decade of XMM operations. X-ray (z < 2) cluster, (z < 4) active galactic nuclei (AGN), and cosmic background survey science will then benefit from an extraordinary data reservoir. This, combined with deep multi-lambda observations, will lead to solid standalone cosmological constraints and provide a wealth of information on the formation and evolution of AGN, clusters, and the X-ray background. In particular, it will offer a unique opportunity to pinpoint the z > 1 cluster density. It will eventually constitute a reference study and an ideal calibration field for the upcoming eROSITA and Euclid missions.

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