Inquiring into the nature of the Abell 2667 brightest cluster galaxy: physical properties from MUSE


Por: Iani, E., Rodighiero, G., Fritz, J., Cresci, G., Mancini, C., Tozzi, P., Rodriguez-Munoz, L., Rosati, P., Caminha, G. B., Zanella, A., Berta, S., Cassata, P., Concas, A., Enia, A., Fadda, D., Franceschini, A., Liu, A., Mercurio, A., Morselli, L., Perez-Gonzalez, P. G., Popesso, P., Sabatini, G., Vernet, J., van Weeren, R. J.

Publicada: 1 ago 2019
Resumen:
Based on HST and MUSE data, we probe the stellar and gas properties (i.e. kinematics, stellar mass, star formation rate) of the radio-loud brightest cluster galaxy (BCG) located at the centre of the X-ray-luminous cool-core cluster Abell 2667 (z= 0.2343). The bi-dimensional modelling of the BCG surface brightness profile reveals the presence of a complex system of substructures extending all around the galaxy. Clumps of different size and shape plunged into a more diffuse component constitute these substructures, whose intense blue' optical colour hints at the presence of a young stellar population. Our results depict the BCG as a massive (M-star similar or equal to 1.38x10(11)M(circle dot)) dispersion-supported spheroid (Delta v(star) <= 150kms(-1), sigma(0) similar to 216kms(-1)) hosting an active supermassive black hole (M-SMBH similar or equal to 3.8x10(9)M(circle dot)) whose optical features are typical of low-ionization nuclear emission line regions. Although the velocity pattern of the stars in the BCG is irregular, the stellar kinematics in the regions of the clumps show a positive velocity of similar to 100kms(-1), similarly to the gas component. An analysis of the mechanism giving rise to the observed lines in the clumps through empirical diagnostic diagrams points out that the emission is composite, suggesting contribution from both star formation and an active galactic nucleus. We conclude our analysis describing how scenarios of both chaotic cold accretion and merging with a gas-rich disc galaxy can efficaciously explain the phenomena the BCG is undergoing.

Filiaciones:
Iani, E.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

 European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

Rodighiero, G.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

 INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

Fritz, J.:
 UNAM, Inst Radioastron & Astrofis, Campus Morelia,AP 3-72, Morelia 58089, Michoacan, Mexico

Cresci, G.:
 INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

Mancini, C.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

 INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

Tozzi, P.:
 INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

Rodriguez-Munoz, L.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

Rosati, P.:
 Univ Ferrara, Dipartimento Fis & Sci Terra, Via Saragat 1, I-44122 Ferrara, Italy

Caminha, G. B.:
 Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands

Zanella, A.:
 European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

Berta, S.:
 Inst Radioastron Millimetr, 300 Rue Piscine,Domaine Univ, F-38406 St Martin Dheres, France

Cassata, P.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

Concas, A.:
 Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany

Enia, A.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

Fadda, D.:
 NASA, SOFIA Sci Ctr, USRA, Ames Res Ctr, MS N232-12, Moffett Field, CA USA

Franceschini, A.:
 Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

Liu, A.:
 INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

Mercurio, A.:
 INAF Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy

Morselli, L.:
 Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany

Perez-Gonzalez, P. G.:
 Univ Complutense Madrid, Dept Astron & Astrofis, Av Complutense S-N, E-28040 Madrid, Spain

 INTA CSIC, CAB, Ctr Astrobiol, Carretera Ajalvir Km 4, E-28850 Madrid, Spain

Popesso, P.:
 Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany

Sabatini, G.:
 Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy

 15INAF Ist Radioastron Italian Node, ALMA Reg Ctr ARC, Via Gobetti 101, I-40129 Bologna, Italy

 Univ Concepcion, Dept Astron, Concepcion 4030000, Chile

Vernet, J.:
 European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

van Weeren, R. J.:
 Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
ISSN: 00358711
Editorial
WILEY-BLACKWELL, COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA, Reino Unido
Tipo de documento: Article
Volumen: 487 Número: 4
Páginas: 5593-5609
WOS Id: 000475888500084

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