English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Measuring redshifted CO line emission is an unambiguous method for obtainingan accurate redshift and total cold gas content of optically faint, dustystarburst systems. Here, we report the first successful spectroscopic redshiftdetermination of AzTEC J095942.9+022938 ("COSMOS AzTEC-1"), the brightest 1.1mmcontinuum source found in the AzTEC/JCMT survey (Scott et al. 2008), through aclear detection of the redshifted CO (4-3) and CO (5-4) lines using theRedshift Search Receiver on the Large Millimeter Telescope. The CO redshift of$z=4.3420\pm0.0004$ is confirmed by the detection of the redshifted 158 micron[C II] line using the Submillimeter Array. The new redshift and Herschelphotometry yield $L_{FIR}=(1.1\pm0.1)\times 10^{13} L_\odot$ and $SFR = 1300\,M_\odot$ yr$^{-1}$. Its molecular gas mass derived using the ULIRG conversionfactor is $1.4\pm0.2 \times 10^{11} M_\odot$ while the total ISM mass derivedfrom the 1.1mm dust continuum is $3.7\pm0.7 \times 10^{11} M_\odot$ assumingdust temperature of 35 K. Our dynamical mass analysis suggests that the compactgas disk ($r\approx 1.1$ kpc, inferred from dust continuum and SED analysis)has to be nearly face-on, providing a natural explanation for the uncommonlybright, compact stellar light seen by the HST. The [C II] line luminosity$L_{[C~II]} = 7.8\pm1.1 \times 10^9 L_\odot$ is remarkably high, but it is only0.04 per cent of the total IR luminosity. AzTEC COSMOS-1 and other highredshift sources with a spatially resolved size extend the tight trend seenbetween [C II]/FIR ratio and $\Sigma_{FIR}$ among IR-bright galaxies reportedby Diaz-Santos et al. (2013) by more than an order of magnitude, supporting theexplanation that the higher intensity of the IR radiation field is responsiblefor the "[C II] deficiency" seen among luminous starburst galaxies.

Early Science with the Large Millimeter Telescope: CO and [C II] Emission in the z=4.3 AzTEC J095942.9+022938 (COSMOS AzTEC-1)