Bibcode
Fogarty, Kevin; Postman, Marc; Li, Yuan; Dannerbauer, Helmut; Liu, Hauyu Baobab; Donahue, Megan; Ziegler, Bodo; Koekemoer, Anton; Frye, Brenda
Referencia bibliográfica
The Astrophysical Journal, Volume 879, Issue 2, article id. 103, 16 pp. (2019).
Fecha de publicación:
7
2019
Revista
Número de citas
30
Número de citas referidas
28
Descripción
We present new Atacama Large Millimeter Array observations of the
molecular gas and far-infrared continuum around the brightest cluster
galaxy (BCG) in the cool-core cluster MACS 1931.8-2635. Our observations
reveal (1.9 ± 0.3) × 1010 M ⊙ of
molecular gas, on par with the largest known reservoirs of cold gas in a
cluster core. We detect CO(1‑0), CO(3‑2), and CO(4‑3)
emission from both diffuse and compact molecular gas components that
extend from the BCG center out to ∼30 kpc to the northwest, tracing
the UV knots and Hα filaments observed by the Hubble Space
Telescope. Due to the lack of morphological symmetry, we hypothesize
that the ∼300 km s‑1 velocity of the CO in the tail
is not due to concurrent uplift by active galactic nucleus (AGN) jets;
rather, we may be observing the aftermath of a recent AGN outburst. The
CO spectral line energy distribution suggests that molecular gas
excitation is influenced by processes related to both star formation and
recent AGN feedback. Continuum emission in Bands 6 and 7 arises from
dust and is spatially coincident with young stars and nebular emission
observed in the UV and optical. We constrain the temperature of several
dust clumps to be ≲10 K, which is too cold to be directly
interacting with the surrounding ∼4.8 keV intracluster medium (ICM).
The cold dust population extends beyond the observed CO emission and
must either be protected from interacting with the ICM or be surrounded
by local volumes of ICM that are several keV colder than observed by
Chandra.
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Dos cuestiones fundamentales en la Astrofísica son la conversión de gas molecuar en estrellas y cómo este proceso físico depende del entorno en todas las escalas, desde sistemas planetarios, cúmulos estelares, galaxias hasta cúmulos de galaxias. El objectivo principal de este proyecto es el de estudiar la formación y evolución de galaxias a partir
Helmut
Dannerbauer