NOEMA Redshift Measurements of the Brightest Submillimeter Galaxies in the GOODS-N. (arXiv:2101.05268v1 [astro-ph.GA])

NOEMA Redshift Measurements of the Brightest Submillimeter Galaxies in the GOODS-N. (arXiv:2101.05268v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Jones_L/0/1/0/all/0/1">Logan H. Jones</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rosenthal_M/0/1/0/all/0/1">Michael J. Rosenthal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barger_A/0/1/0/all/0/1">Amy J. Barger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cowie_L/0/1/0/all/0/1">Lennox L. Cowie</a>

We report spectroscopic redshift measurements for three bright submillimeter
galaxies (SMGs) in the GOODS-N field, each with SCUBA-2 850 micron fluxes > 10
mJy, using the Northern Extended Millimeter Array (NOEMA). Our molecular
linescan observations of these sources, which occupy a ~7 arcmin$^2$ area
outside of the HST/ACS region of the field, reveal that two lie at $z sim$
3.14 and thus likely belong to a previously-unknown overdensity of rare
galaxies, which we shall refer to as a protocluster. In the remaining object,
which is the brightest SCUBA-2 source in the entire GOODS-N, we detect line
emission consistent with CO(7-6), [C I], and H2O at $z$ = 4.42. The
far-infrared spectral energy distributions of these galaxies, constrained by
SCUBA-2, NOEMA, and Herschel/SPIRE, indicate instantaneous SFRs $sim4000 ~{rm
M_{odot}~yr^{-1}}$ in the $z$ = 4.42 galaxy and $sim 2500~{rm
M_{odot}~yr^{-1}}$ in the two $z sim$ 3 galaxies. These occupy a co-moving
volume ~30 Mpc$^3$, making the protocluster one of the most compact,
spectroscopically-confirmed episodes of simultaneous dusty starbursts. Based on
our sources’ CO line luminosities, we estimate $M_{{rm gas}}sim10^{11}
M_{odot}$ and find gas depletion timescales of $tau_{{rm depl}}sim 50$ Myr,
consistent with findings in other high-redshift SMG protoclusters.

We report spectroscopic redshift measurements for three bright submillimeter
galaxies (SMGs) in the GOODS-N field, each with SCUBA-2 850 micron fluxes > 10
mJy, using the Northern Extended Millimeter Array (NOEMA). Our molecular
linescan observations of these sources, which occupy a ~7 arcmin$^2$ area
outside of the HST/ACS region of the field, reveal that two lie at $z sim$
3.14 and thus likely belong to a previously-unknown overdensity of rare
galaxies, which we shall refer to as a protocluster. In the remaining object,
which is the brightest SCUBA-2 source in the entire GOODS-N, we detect line
emission consistent with CO(7-6), [C I], and H2O at $z$ = 4.42. The
far-infrared spectral energy distributions of these galaxies, constrained by
SCUBA-2, NOEMA, and Herschel/SPIRE, indicate instantaneous SFRs $sim4000 ~{rm
M_{odot}~yr^{-1}}$ in the $z$ = 4.42 galaxy and $sim 2500~{rm
M_{odot}~yr^{-1}}$ in the two $z sim$ 3 galaxies. These occupy a co-moving
volume ~30 Mpc$^3$, making the protocluster one of the most compact,
spectroscopically-confirmed episodes of simultaneous dusty starbursts. Based on
our sources’ CO line luminosities, we estimate $M_{{rm gas}}sim10^{11}
M_{odot}$ and find gas depletion timescales of $tau_{{rm depl}}sim 50$ Myr,
consistent with findings in other high-redshift SMG protoclusters.

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