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
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