All Outputs (19)

Euclid preparation: VII. Forecast validation for Euclid cosmological probes (2020)
Journal Article
Blanchard, A., Camera, S., Carbone, C., Cardone, V., Casas, S., Clesse, S., Ilić, S., Kilbinger, M., Kitching, T., Kunz, M., Lacasa, F., Linder, E., Majerotto, E., Markovič, K., Martinelli, M., Pettorino, V., Pourtsidou, A., Sakr, Z., Sánchez, A., Sapone, D., …Zucca, E. (2020). Euclid preparation: VII. Forecast validation for Euclid cosmological probes. Astronomy & Astrophysics, 642, Article A191. https://doi.org/10.1051/0004-6361/202038071

Aims. The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct the expansion history of the Universe and the growth of cosmic structures. The estimation of the expected performance of the experiment, in terms of pre... Read More about Euclid preparation: VII. Forecast validation for Euclid cosmological probes.

Euclid preparation: VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release (2020)
Journal Article
Guglielmo, V., Saglia, R., Castander, F., Galametz, A., Paltani, S., Bender, R., Bolzonella, M., Capak, P., Ilbert, O., Masters, D., Stern, D., Andreon, S., Auricchio, N., Balaguera-Antolínez, A., Baldi, M., Bardelli, S., Biviano, A., Bodendorf, C., Bonino, D., Bozzo, E., …Zucca, E. (2020). Euclid preparation: VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release. Astronomy & Astrophysics, 642, Article A192. https://doi.org/10.1051/0004-6361/202038334

The Complete Calibration of the Colour–Redshift Relation survey (C3R2) is a spectroscopic effort involving ESO and Keck facilities designed specifically to empirically calibrate the galaxy colour–redshift relation – P(z|C) to the Euclid depth (iAB =... Read More about Euclid preparation: VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release.

The XXL Survey: XLIV. Sunyaev-Zel’dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach (2020)
Journal Article
Ricci, M., Adam, R., Eckert, D., Ade, P., André, P., Andrianasolo, A., Altieri, B., Aussel, H., Beelen, A., Benoist, C., Benoît, A., Berta, S., Bideaud, A., Birkinshaw, M., Bourrion, O., Boutigny, D., Bremer, M., Calvo, M., Cappi, A., Chiappetti, L., …Umetsu, K. (2020). The XXL Survey: XLIV. Sunyaev-Zel’dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach. Astronomy & Astrophysics, 642, Article A126. https://doi.org/10.1051/0004-6361/201937249

High-mass clusters at low redshifts have been intensively studied at various wavelengths. However, while more distant objects at lower masses constitute the bulk population of future surveys, their physical state remain poorly explored to date. In th... Read More about The XXL Survey: XLIV. Sunyaev-Zel’dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach.

Detecting neutral hydrogen at z ≳ 3 in large spectroscopic surveys of quasars (2020)
Journal Article
Fumagalli, M., Fotopoulou, S., & Thomson, L. (2020). Detecting neutral hydrogen at z ≳ 3 in large spectroscopic surveys of quasars. Monthly Notices of the Royal Astronomical Society, 498(2), 1951-1962. https://doi.org/10.1093/mnras/staa2388

We present a pipeline based on a random forest classifier for the identification of high column density clouds of neutral hydrogen (i.e. the Lyman limit systems, LLSs) in absorption within large spectroscopic surveys of z ≳ 3 quasars. We test the per... Read More about Detecting neutral hydrogen at z ≳ 3 in large spectroscopic surveys of quasars.

The XXL Survey: XL. Obscuration properties of red AGNs in XXL-N (2020)
Journal Article
Masoura, V., Georgantopoulos, I., Mountrichas, G., Vignali, C., Koulouridis, E., Chiappetti, L., Fotopoulou, S., Paltani, S., & Pierre, M. (2020). The XXL Survey: XL. Obscuration properties of red AGNs in XXL-N. Astronomy & Astrophysics, 638, Article A45. https://doi.org/10.1051/0004-6361/201937161

The combination of optical and mid-infrared (MIR) photometry has been extensively used to select red active galactic nuclei (AGNs). Our aim is to explore the obscuration properties of these red AGNs with both X-ray spectroscopy and spectral energy di... Read More about The XXL Survey: XL. Obscuration properties of red AGNs in XXL-N.

The XXL Survey: XLI. Radio AGN luminosity functions based on the GMRT 610 MHz continuum observations (2020)
Journal Article
Šlaus, B., Smolčić, V., Novak, M., Fotopoulou, S., Ciliegi, P., Jurlin, N., Ceraj, L., Tisanić, K., Birkinshaw, M., Bremer, M., Chiappetti, L., Horellou, C., Huynh, M., Intema, H., Kolokythas, K., Pierre, M., Raychaudhury, S., & Rottgering, H. (2020). The XXL Survey: XLI. Radio AGN luminosity functions based on the GMRT 610 MHz continuum observations. Astronomy & Astrophysics, 638, Article A46. https://doi.org/10.1051/0004-6361/201937258

We study the space density evolution of active galactic nuclei (AGN) using the 610 MHz radio survey of the XXL-North field, performed with the Giant Metrewave Radio Telescope. The survey covers an area of 30.4 deg2, with a beamsize of 6.5 arcsec. The... Read More about The XXL Survey: XLI. Radio AGN luminosity functions based on the GMRT 610 MHz continuum observations.

Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars (2020)
Journal Article
Fawcett, V., Alexander, D., Rosario, D., Klindt, L., Fotopoulou, S., Lusso, E., Morabito, L., & Calistro Rivera, G. (2020). Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars. Monthly Notices of the Royal Astronomical Society, 494(4), 4802-4818. https://doi.org/10.1093/mnras/staa954

We have recently used the Faint Images of the Radio Sky at Twenty-centimeters (FIRST) survey to show that red quasars have fundamentally different radio properties to typical blue quasars: a significant (factor ≈3) enhancement in the radio-detection... Read More about Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars.

Unsupervised star, galaxy, QSO classification: Application of HDBSCAN (2020)
Journal Article
Logan, C., & Fotopoulou, S. (2020). Unsupervised star, galaxy, QSO classification: Application of HDBSCAN. Astronomy & Astrophysics, 633, Article A154. https://doi.org/10.1051/0004-6361/201936648

Context. Classification will be an important first step for upcoming surveys aimed at detecting billions of new sources, such as LSST and Euclid, as well as DESI, 4MOST, and MOONS. The application of traditional methods of model fitting and colour-co... Read More about Unsupervised star, galaxy, QSO classification: Application of HDBSCAN.

Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey (2019)
Journal Article
Barnett, R., Warren, S., Mortlock, D., Cuby, J.-G., Conselice, C., Hewett, P., Willott, C., Auricchio, N., Balaguera-Antolínez, A., Baldi, M., Bardelli, S., Bellagamba, F., Bender, R., Biviano, A., Bonino, D., Bozzo, E., Branchini, E., Brescia, M., Brinchmann, J., Burigana, C., …Zucca, E. (2019). Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey. Astronomy & Astrophysics, 631, Article A85. https://doi.org/10.1051/0004-6361/201936427

We provide predictions of the yield of 7 < z < 9 quasars from the Euclid wide survey, updating the calculation presented in the Euclid Red Book in several ways. We account for revisions to the Euclid near-infrared filter wavelengths; we adopt steeper... Read More about Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey.

Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation (2019)
Journal Article
Klindt, L., Alexander, D., Rosario, D., Lusso, E., & Fotopoulou, S. (2019). Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation. Monthly Notices of the Royal Astronomical Society, 488(3), 3109-3128. https://doi.org/10.1093/mnras/stz1771

A minority of the optically selected quasar population are red at optical wavelengths due to the presence of dust along the line of sight. A key focus of many red quasar studies is to understand their relationship with the overall quasar population:... Read More about Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation.

The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Analysis and Data Release 2 (2019)
Journal Article
Masters, D. C., Stern, D. K., Cohen, J. G., Capak, P. L., Stanford, S. A., Hernitschek, N., Galametz, A., Davidzon, I., Rhodes, J. D., Sanders, D., Mobasher, B., Castander, F., Pruett, K., & Fotopoulou, S. (2019). The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Analysis and Data Release 2. Astrophysical Journal, 877(2), Article 81. https://doi.org/10.3847/1538-4357/ab184d

The Complete Calibration of the Color-Redshift Relation (C3R2) survey is a multi-institution, multi-instrument survey that aims to map the empirical relation of galaxy color to redshift to i ~ 24.5 (AB), thereby providing a firm foundation for weak l... Read More about The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Analysis and Data Release 2.

The XXL Survey (2019)
Journal Article
Guglielmo, V., Poggianti, B., Vulcani, B., Maurogordato, S., Fritz, J., Bolzonella, M., Fotopoulou, S., Adami, C., & Pierre, M. (2019). The XXL Survey. Astronomy & Astrophysics, 625, https://doi.org/10.1051/0004-6361/201834970

Exploiting a sample of galaxies drawn from the XXL-North multiwavelength survey, we present an analysis of the stellar population properties of galaxies at 0.1 ≤ z ≤ 0.5, by studying galaxy fractions and the star formation rate (SFR)–stellar mass (M⋆... Read More about The XXL Survey.

SUPER: I. Toward an unbiased study of ionized outflows in z ∼ 2 active galactic nuclei: survey overview and sample characterization⋆ (2018)
Journal Article
Circosta, C., Mainieri, V., Padovani, P., Lanzuisi, G., Salvato, M., Harrison, C., Kakkad, D., Puglisi, A., Vietri, G., Zamorani, G., Cicone, C., Husemann, B., Vignali, C., Balmaverde, B., Bischetti, M., Bongiorno, A., Brusa, M., Carniani, S., Civano, F., Comastri, A., …Zappacosta, L. (2018). SUPER: I. Toward an unbiased study of ionized outflows in z ∼ 2 active galactic nuclei: survey overview and sample characterization⋆. Astronomy & Astrophysics, 620, Article A82. https://doi.org/10.1051/0004-6361/201833520

Theoretical models of galaxy formation suggest that the presence of an active galactic nucleus (AGN) is required to regulate the growth of its host galaxy through feedback mechanisms, produced by, for example, AGN-driven outflows. Although many obser... Read More about SUPER: I. Toward an unbiased study of ionized outflows in z ∼ 2 active galactic nuclei: survey overview and sample characterization⋆.

The XXL Survey: XXXIV. Double Irony in XXL-North: a tale of two radio galaxies in a supercluster at z = 0.14 (2018)
Journal Article
Horellou, C., Intema, H., Smolčić, V., Nilsson, A., Karlsson, F., Krook, C., Tolliner, L., Adami, C., Benoist, C., Birkinshaw, M., Caretta, C., Chiappetti, L., Delhaize, J., Ferrari, C., Fotopoulou, S., Guglielmo, V., Kolokythas, K., Pacaud, F., Pierre, M., Poggianti, B., …Vignali, C. (2018). The XXL Survey: XXXIV. Double Irony in XXL-North: a tale of two radio galaxies in a supercluster at z = 0.14. Astronomy & Astrophysics, 620, https://doi.org/10.1051/0004-6361/201832972

Aims. We show how the XXL multiwavelength survey can be used to shed light on radio galaxies and their environment. Methods. Two prominent radio galaxies were identified in a visual examination of the mosaic of XXL-North obtained with the Giant Metre... Read More about The XXL Survey: XXXIV. Double Irony in XXL-North: a tale of two radio galaxies in a supercluster at z = 0.14.

The XXL Survey: XX. The 365 cluster catalogue (2018)
Journal Article
Adami, C., Giles, P., Koulouridis, E., Pacaud, F., Caretta, C., Pierre, M., Eckert, D., Ramos-Ceja, M., Gastaldello, F., Fotopoulou, S., Guglielmo, V., Lidman, C., Sadibekova, T., Iovino, A., Maughan, B., Chiappetti, L., Alis, S., Altieri, B., Baldry, I., Bottini, D., …Willis, J. (2018). The XXL Survey: XX. The 365 cluster catalogue. Astronomy & Astrophysics, 620, Article A5. https://doi.org/10.1051/0004-6361/201731606

Context. In the currently debated context of using clusters of galaxies as cosmological probes, the need for well-defined cluster samples is critical. Aims. The XXL Survey has been specifically designed to provide a well characterised sample of some... Read More about The XXL Survey: XX. The 365 cluster catalogue.

The XXL Survey: XXVI. Optical and near-infrared identifications of the ATCA 2.1 GHz radio sources in the XXL-S Field (2018)
Journal Article
Ciliegi, P., Jurlin, N., Butler, A., Delhaize, J., Fotopoulou, S., Huynh, M., Iovino, A., Smolčić, V., Chiappetti, L., & Pierre, M. (2018). The XXL Survey: XXVI. Optical and near-infrared identifications of the ATCA 2.1 GHz radio sources in the XXL-S Field. Astronomy & Astrophysics, 620, https://doi.org/10.1051/0004-6361/201833616

Context. To investigate the nature of the extragalactic radio sources, it is necessary to couple radio surveys with multiwavelength observations over large areas of the sky. The XMM-Newton Extragalactic (XXL) survey is the largest survey ever underta... Read More about The XXL Survey: XXVI. Optical and near-infrared identifications of the ATCA 2.1 GHz radio sources in the XXL-S Field.

The XXL Survey: XXXV. The role of cluster mass in AGN activity (2018)
Journal Article
Koulouridis, E., Ricci, M., Giles, P., Adami, C., Ramos-Ceja, M., Pierre, M., Plionis, M., Lidman, C., Georgantopoulos, I., Chiappetti, L., Elyiv, A., Ettori, S., Faccioli, L., Fotopoulou, S., Gastaldello, F., Pacaud, F., Paltani, S., & Vignali, C. (2018). The XXL Survey: XXXV. The role of cluster mass in AGN activity. Astronomy & Astrophysics, 620, https://doi.org/10.1051/0004-6361/201832974

Context. We present the results of a study of the active galactic nucleus (AGN) density in a homogeneous and well-studied sample of 167 bona fide X-ray galaxy clusters (0.1 < z < 0.5) from the XXL Survey, from the cluster core to the outskirts (up to... Read More about The XXL Survey: XXXV. The role of cluster mass in AGN activity.

The XXL Survey: XXXII. Spatial clustering of the XXL-S AGN (2018)
Journal Article
Plionis, M., Koutoulidis, L., Koulouridis, E., Moscardini, L., Lidman, C., Pierre, M., …Paltani, S. (2018). The XXL Survey: XXXII. Spatial clustering of the XXL-S AGN. Astronomy & Astrophysics, 620, Article A17. https://doi.org/10.1051/0004-6361/201832970

The XMM-XXL Survey spans two fields of 25 deg2 each observed for more than 6 Ms with XMM, which provided a sample of tens of thousands of point sources with a flux limit of ~2.2 × 10−15 and ~1.4 × 10−14 erg s−1 cm2, corresponding to 50% of the area c... Read More about The XXL Survey: XXXII. Spatial clustering of the XXL-S AGN.

CPz: Classification-aided photometric-redshift estimation (2018)
Journal Article
Fotopoulou, S., & Paltani, S. (2018). CPz: Classification-aided photometric-redshift estimation. Astronomy & Astrophysics, 619, Article A14. https://doi.org/10.1051/0004-6361/201730763

Broadband photometry offers a time and cost effective method to reconstruct the continuum emission of celestial objects. Thus, photometric redshift estimation has supported the scientific exploitation of extragalactic multiwavelength surveys for more... Read More about CPz: Classification-aided photometric-redshift estimation.