Exploiting the sensitivity and spatial resolution of the Atacama Large
Millimeter/submillimeter Array (ALMA), we have studied the morphology and the
physical scale of the interstellar medium - both gas and dust - in SGP38326, an
unlensed pair of interacting starbursts at $z= 4.425$. SGP38326 is the most
luminous star bursting system known at $z > 4$ with an IR-derived $SFR
4300 \, M_\, yr^-1$. SGP38326 also contains a molecular gas
reservoir among the most massive ever found in the early Universe, and it is
the likely progenitor of a massive, red-and-dead elliptical galaxy at $z \sim
3$. Probing scales of $0.1"$ or $800 \, pc$ we find that the
smooth distribution of the continuum emission from cool dust grains contrasts
with the more irregular morphology of the gas, as traced by the CII fine
structure emission. The gas is also extended over larger physical scales than
the dust. The velocity information provided by the resolved CII emission
reveals that the dynamics of the two components of SGP38326 are compatible with
disk-like, ordered rotation, but also reveals an ISM which is turbulent and
unstable. Our observations support a scenario where at least a subset of the
most distant extreme starbursts are highly dissipative mergers of gas-rich
galaxies.
Description
[1601.07549] Witnessing the birth of the red sequence: ALMA high-resolution imaging of [CII] and dust in two interacting ultra-red starbursts at z = 4.425
%0 Generic
%1 oteo2016witnessing
%A Oteo, I.
%A Ivison, R. J.
%A Dunne, L.
%A Smail, I.
%A Swinbank, M.
%A Zhang, Z-Y.
%A Lewis, A.
%A Maddox, S.
%A Riechers, D.
%A Serjeant, S.
%A Van der Werf, P.
%A Bremer, M.
%A Cigan, P.
%A Clements, D. L.
%A Cooray, A.
%A Dannerbauer, H.
%A Eales, S.
%A Ibar, E.
%A Messias, H.
%A Michałowski, M. J.
%A Pérez-Fournon, I.
%A van Kampen, E.
%D 2016
%K alma merger red sequence
%T Witnessing the birth of the red sequence: ALMA high-resolution imaging
of CII and dust in two interacting ultra-red starbursts at z = 4.425
%U http://arxiv.org/abs/1601.07549
%X Exploiting the sensitivity and spatial resolution of the Atacama Large
Millimeter/submillimeter Array (ALMA), we have studied the morphology and the
physical scale of the interstellar medium - both gas and dust - in SGP38326, an
unlensed pair of interacting starbursts at $z= 4.425$. SGP38326 is the most
luminous star bursting system known at $z > 4$ with an IR-derived $SFR
4300 \, M_\, yr^-1$. SGP38326 also contains a molecular gas
reservoir among the most massive ever found in the early Universe, and it is
the likely progenitor of a massive, red-and-dead elliptical galaxy at $z \sim
3$. Probing scales of $0.1"$ or $800 \, pc$ we find that the
smooth distribution of the continuum emission from cool dust grains contrasts
with the more irregular morphology of the gas, as traced by the CII fine
structure emission. The gas is also extended over larger physical scales than
the dust. The velocity information provided by the resolved CII emission
reveals that the dynamics of the two components of SGP38326 are compatible with
disk-like, ordered rotation, but also reveals an ISM which is turbulent and
unstable. Our observations support a scenario where at least a subset of the
most distant extreme starbursts are highly dissipative mergers of gas-rich
galaxies.
@misc{oteo2016witnessing,
abstract = {Exploiting the sensitivity and spatial resolution of the Atacama Large
Millimeter/submillimeter Array (ALMA), we have studied the morphology and the
physical scale of the interstellar medium - both gas and dust - in SGP38326, an
unlensed pair of interacting starbursts at $z= 4.425$. SGP38326 is the most
luminous star bursting system known at $z > 4$ with an IR-derived ${\rm SFR
\sim 4300 \,} M_\odot \, {\rm yr}^{-1}$. SGP38326 also contains a molecular gas
reservoir among the most massive ever found in the early Universe, and it is
the likely progenitor of a massive, red-and-dead elliptical galaxy at $z \sim
3$. Probing scales of $\sim 0.1"$ or $\sim 800 \, {\rm pc}$ we find that the
smooth distribution of the continuum emission from cool dust grains contrasts
with the more irregular morphology of the gas, as traced by the [CII] fine
structure emission. The gas is also extended over larger physical scales than
the dust. The velocity information provided by the resolved [CII] emission
reveals that the dynamics of the two components of SGP38326 are compatible with
disk-like, ordered rotation, but also reveals an ISM which is turbulent and
unstable. Our observations support a scenario where at least a subset of the
most distant extreme starbursts are highly dissipative mergers of gas-rich
galaxies.},
added-at = {2016-01-29T09:56:25.000+0100},
author = {Oteo, I. and Ivison, R. J. and Dunne, L. and Smail, I. and Swinbank, M. and Zhang, Z-Y. and Lewis, A. and Maddox, S. and Riechers, D. and Serjeant, S. and Van der Werf, P. and Bremer, M. and Cigan, P. and Clements, D. L. and Cooray, A. and Dannerbauer, H. and Eales, S. and Ibar, E. and Messias, H. and Michałowski, M. J. and Pérez-Fournon, I. and van Kampen, E.},
biburl = {https://www.bibsonomy.org/bibtex/260590a5c833626ed0c1770d67244ecf8/miki},
description = {[1601.07549] Witnessing the birth of the red sequence: ALMA high-resolution imaging of [CII] and dust in two interacting ultra-red starbursts at z = 4.425},
interhash = {b48e936c692023d322ebbd53c07ad211},
intrahash = {60590a5c833626ed0c1770d67244ecf8},
keywords = {alma merger red sequence},
note = {cite arxiv:1601.07549Comment: Submitted to ApJ},
timestamp = {2016-01-29T09:56:25.000+0100},
title = {Witnessing the birth of the red sequence: ALMA high-resolution imaging
of [CII] and dust in two interacting ultra-red starbursts at z = 4.425},
url = {http://arxiv.org/abs/1601.07549},
year = 2016
}