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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33118
Title: Star forming and gas rich brightest cluster galaxies at z~0.4 in the Kilo-Degree Survey
Authors: Castignani, Gianluca
RADOVICH, MARIO 
Combes, Francoise
Salomé, Patrice
Maturi, Matteo
MOSCARDINI, LAURO 
BARDELLI, Sandro 
GIOCOLI, Carlo 
LESCI, GIORGIO 
Marulli, Federico 
PUDDU, Emanuella Anna 
Sereno, Mauro 
Issue Date: 2022
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 667
First Page: 1
Abstract: Brightest Cluster Galaxies (BCGs) are typically massive ellipticals at the centers of clusters. They are believed to experience strong environmental processing, and their mass assembly and star formation history are still debated. We have selected three star forming BCGs in the equatorial field of the Kilo-Degree Survey (KiDS) at intermediate redshifts. We have observed them with the IRAM-30m telescope in the first three CO transitions. We remarkably detected all BCGs at high signal-to-noise ratio ${\rm S/N}\simeq(3.8-10.2)$, for a total of 7 detected lines out of 8, corresponding to a success rate of $88\%$. This allows us to double the number of distant BCGs with clear detections in at least two CO lines. We have then combined our observations with available stellar, star formation, and dust properties of the BCGs, and we have compared them with a sample of $\sim100$ distant cluster galaxies with observations in CO. Our analysis yields large molecular gas reservoirs $M_{H_2}\simeq(0.5-1.4)\times10^{11}~M_\odot$, excitation ratios $r_{31}= L^{\prime}_{\rm CO(3\rightarrow2)}/L^{\prime}_{\rm CO(1\rightarrow0)}\simeq(0.1-0.3)$, long depletion times $\tau_{\rm dep}\simeq(2-4)$~Gyr, and high $M_{H_2}/M_{\rm dust}\simeq(170-300)$. The excitation ratio $r_{31}$ of intermediate-$z$ BCGs appears to be well correlated with the star formation rate and efficiency, which suggests that excited gas is found only in highly star forming and cool-core BCGs. By performing color-magnitude plots and a red sequence modeling we find that recent bursts of star formation are needed to explain the fact that the BCGs are measurably bluer than photometrically selected cluster members. We suggest that a substantial amount of the molecular gas has been accreted by the KiDS BCGs, but still not efficiently converted into stars.
URI: http://hdl.handle.net/20.500.12386/33118
URL: https://www.aanda.org/articles/aa/full_html/2022/11/aa43689-22/aa43689-22.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202243689
Bibcode ADS: 2022A&A...667A..52C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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