Gianluca Castignani

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Publications associées (29)

Molecular gas in CLASH brightest cluster galaxies at z similar to 0.2-0.9

Pascale Jablonka, Gianluca Castignani

Brightest cluster galaxies (BCGs) are excellent laboratories for the study of galaxy evolution in dense Mpc-scale environments. We used the IRAM-30 m to observe, in CO(1 -> 0), CO(2 -> 1), CO(3 -> 2), or CO(4 -> 3), 18 BCGs at z similar to 0.2-0.9 drawn fr ...

EDP SCIENCES S A2020

Euclid preparation VIII. The Complete Calibration of the Colour-Redshift Relation survey: VLT/KMOS observations and data release

Murat Kunt, Georges Meylan, Gianluca Castignani, Santiago Serrano Guisan, Yi Wang, Richard Massey

The Complete Calibration of the Colour-Redshift Relation survey (C3R2) is a spectroscopic e ffort involving ESO and Keck facilities designed specifically to empirically calibrate the galaxy colour-redshift relation - P(z jC) to the Euclid depth (iAB = 24 : ...

EDP SCIENCES S A2020

Euclid preparation: X. The Euclid photometric-redshift challenge

Georges Meylan, Gianluca Castignani

Forthcoming large photometric surveys for cosmology require precise and accurate photometric redshift (photo-z) measurements for the success of their main science objectives. However, to date, no method has been able to produce photo-zs at the required acc ...

EDP SCIENCES S A2020

Environmental processing in cluster core galaxies at z=1.7

Gianluca Castignani

Today, the brightest cluster galaxies (BCGs) are passive and very massive galaxies at the center of their clusters, and they still accrete mass through swallowing companions and gas from cooling flows. However their formation history is not well known. We ...

2020

Molecular gas in distant brightest cluster galaxies

Gianluca Castignani

The mechanisms governing the stellar mass assembly and star formation history of brightest cluster galaxies (BCGs) are still being debated. By means of new and archival molecular gas observations we investigate the role of dense megaparsec-scale environmen ...

2020

Molecular gas in radio galaxies in dense megaparsec-scale environments at z=0.4-2.6

Gianluca Castignani

Context. Low luminosity radio galaxies (LLRGs) typically reside in dense megaparsec-scale environments and are often associated with brightest cluster galaxies (BCGs). They are an excellent tool to study the evolution of molecular gas reservoirs in giant e ...

EDP SCIENCES S A2019

Euclid preparation III. Galaxy cluster detection in the wide photometric survey, performance and algorithm selection

Gianluca Castignani, Marina Ricci, Adam Julian Richardson

Galaxy cluster counts in bins of mass and redshift have been shown to be a competitive probe to test cosmological models. This method requires an efficient blind detection of clusters from surveys with a well-known selection function and robust mass estima ...

EDP Sciences2019

Molecular gas in two companion cluster galaxies at z=1.2

Gianluca Castignani, Anand Stéphane Raichoor

Context. Probing both star formation history and evolution of distant cluster galaxies is essential to evaluate the effect of dense environment on shaping the galaxy properties we observe today. ...

EDP SCIENCES S A2018

Molecular gas in two companion cluster galaxies at z = 1.2 (vol 617, A103, 2018)

Gianluca Castignani, Anand Stéphane Raichoor

EDP SCIENCES S A2018

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Euclid preparation VIII. The Complete Calibration of the Colour-Redshift Relation survey: VLT/KMOS observations and data release

Murat Kunt, Georges Meylan, Gianluca Castignani, Santiago Serrano Guisan, Yi Wang, Richard Massey

EDP SCIENCES S A2020

Molecular gas in two companion cluster galaxies at z=1.2

Gianluca Castignani, Anand Stéphane Raichoor

Context. Probing both star formation history and evolution of distant cluster galaxies is essential to evaluate the effect of dense environment on shaping the galaxy properties we observe today. ...

EDP SCIENCES S A2018