2018ApJ...864...38L -
Astrophys. J., 864, 38-38 (2018/September-1)
CO (7-6), [C I] 370 µm, and [N II] 205 µm line emission of the QSO BRI 1335-0417 at redshift 4.407.
LU N., CAO T., DIAZ-SANTOS T., ZHAO Y., PRIVON G.C., CHENG C., GAO Y., XU C.K., CHARMANDARIS V., RIGOPOULOU D., VAN DER WERF P.P., HUANG J., WANG Z., EVANS A.S. and SANDERS D.B.
Abstract (from CDS):
We present the results from our Atacama Large Millimeter/submillimeter Array (ALMA) imaging observations of the CO(7-6), [C I] 370 µm (hereafter [C I]), and [N II] 205 µm (hereafter [N II]) lines and their underlying continuum emission of BRI 1335-0417, an infrared bright quasar at z = 4.407. At the achieved resolutions of ∼1.''1 to 1.''2 (or 7.5-8.2 kpc), the continuum at 205 and 372 µm (rest frame), the CO(7-6), and the [C I] emissions are at best barely resolved whereas the [N II] emission is well resolved with a beam-deconvolved major axis of 1.''3(±0.''3) or 9(±2) kpc. As a warm dense gas tracer, the CO(7-6) emission shows a more compact spatial distribution and a significantly higher peak velocity dispersion than the other two lines that probe lower density gas, a picture favoring a merger-triggered star formation (SF) scenario over an orderly rotating SF disk. The CO(7-6) data also indicate a possible QSO-driven gas outflow that reaches a maximum line-of-sight velocity of 500-600 km s–1. The far-infrared (FIR) dust temperature (Tdust ) of 41.5 K from a graybody fit to the continuum agrees well with the average Tdust inferred from various line luminosity ratios. The resulting LCO(7–6)/LFIR luminosity ratio is consistent with that of local luminous infrared galaxies powered predominantly by SF. The LCO(7–6)-inferred SF rate is 5.1(±1.5) x 103 M☉ yr–1. The system has an effective star-forming region of 1.7–0.8+1.7 kpc in diameter and a molecular gas reservoir of ∼5 x 1011 M☉.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: active - galaxies: ISM - galaxies: star formation - infrared: galaxies - ISM: molecules - submillimeter: galaxies
Simbad objects:
8
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