Close-up view of a luminous star-forming galaxy at <i>z</i> = 2.95

Exploiting the sensitivity of IRAM NOrthern Extended Millimeter Array (NOEMA) and its ability to process large instantaneous bandwidths, we have studied morphology other properties molecular gas dust in star forming galaxy, H-ATLAS J131611.5+281219 (HerBS-89a), at z = 2.95. High angular resolution (0 . ?3) images reveal a partial 1 ?0 diameter Einstein ring continuum emission lines 12 CO(9?8) H 2 O(2 02 ? 11 ). Together with lower ?6) images, report detection series including three fundamental transitions ion OH + , namely (1 0 ), seen absorption; CH 0) absorption, tentatively emission; two amidogen (NH (2 ) 20 HCN(11 10) and/or NH(1 absorption. The NOEMA data are complemented Very Large tracing CO(1 line, which provides measurement total mass an anchor for CO excitation analysis. In addition, present Hubble Space Telescope imaging that reveals foreground lensing galaxy near-infrared (1.15 ? m). photometric from Gran Telescopio Canarias, derive redshift phot 0.9 ?0.5 +0.3 galaxy. Modeling HerBS-89a, reconstruct (magnified by factor ? 5.0) ? 4 5) source plane, probe scales ?0 ?1 (or 800 pc). CO(9 8) comparable spatial kinematic distributions; source-plane reconstructions do not clearly distinguish between one-component two-component scenario, but latter, compact rotating components sizes ?1 kpc likely merging, more naturally accounts broad line widths observed HerBS-89a. core very dense n 10 7 9 cm ?3 is revealed NH possible absorption line. HerBS-89a powerful M mol (2.1 ± 0.4) × ? infrared luminosity L IR (4.6 (2.6 0.2) yielding dust-to-gas ratio ? GDR ? 80. We formation rate SFR 614 59 yr ?1 depletion timescale ? depl (3.4 1.0) 8 years. lines, trace low (?100 density gas, all their main velocity component red-shifted ? V 100 km s relative global reservoir. argue these rare example inflow toward center indicating accreting surroundings.