2021A&A...645A..45C


Query : 2021A&A...645A..45C

2021A&A...645A..45C - Astronomy and Astrophysics, volume 645A, 45-45 (2021/1-1)

Planck's Dusty GEMS. VIII. Dense-gas reservoirs in the most active dusty starbursts at z ∼ 3.

CANAMERAS R., NESVADBA N.P.H., KNEISSL R., KONIG S., YANG C., BEELEN A., HILL R., LE FLOC'H E. and SCOTT D.

Abstract (from CDS):

We present ALMA, NOEMA, and IRAM-30 m/EMIR observations of the high-density tracer molecules HCN, HCO+, and HNC in three of the brightest lensed dusty star-forming galaxies at z≃3-3.5, part of the Planck's Dusty Gravitationally Enhanced subMillimetre Sources (GEMS), with the aim of probing the gas reservoirs closely associated with their exceptional levels of star formation. We obtained robust detections of ten emission lines between Jup=4 and 6, as well as several additional upper flux limits. In PLCK_G244.8+54.9, the brightest source at z=3.0, the HNC(5-4) line emission at 0.1'' resolution, together with other spatially-integrated line profiles, suggests comparable distributions of dense and more diffuse gas reservoirs, at least over the most strongly magnified regions. This rules out any major effect from differential lensing. This line is blended with CN(4-3) and in this source, we measure a HNC(5-4)/CN(4-3) flux ratio of 1.76±0.86. Dense-gas line profiles generally match those of mid-J CO lines, except in PLCK_G145.2+50.8, which also has dense-gas line fluxes that are relatively lower, perhaps due to fewer dense cores and more segregated dense and diffuse gas phases in this source. The HCO+/HCN≥1 and HNC/HCN ∼1 line ratios in our sample are similar to those of nearby ultraluminous infrared galaxies (ULIRGs) and consistent with photon-dominated regions without any indication of important mechanical heating or active galactic nuclei feedback. We characterize the dense-gas excitation in PLCK_G244.8+54.9 using radiative transfer models assuming pure collisional excitation and find that mid-J HCN, HCO+, and HNC lines arise from a high-density phase with an H2 density of n∼105-106cm–3, although important degeneracies hinder a determination of the exact conditions. The three GEMS are consistent with extrapolations of dense-gas star-formation laws derived in the nearby Universe, adding further evidence that the extreme star-formation rates observed in the most active galaxies at z∼3 are a consequence of their important dense-gas contents. The dense-gas-mass fractions traced by HCN/[CI] and HCO+/[CI] line ratios are elevated, but not exceptional as compared to other lensed dusty star-forming galaxies at z>2, and they fall near the upper envelope of local ULIRGs. Despite the higher overall gas fractions and local gas-mass surface densities observed at high redshift, the dense-gas budget of rapidly star-forming galaxies seems to have evolved little between z∼3 and z∼0. Our results favor constant dense-gas depletion times in these populations, which is in agreement with theoretical models of star formation.

Abstract Copyright: © R. Cañameras et al. 2021

Journal keyword(s): galaxies: high-redshift - galaxies: evolution - galaxies: star formation - galaxies: ISM - submillimeter: galaxies - ISM: molecules

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3124 2
2 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4323 2
3 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3769 3
4 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1451 1
5 EM* LkHA 101 Em* 04 30 14.4355820328 +35 16 23.983198932   17.91 15.71 13.33   F 324 1
6 NAME Ori A MoC 05 38 -07.1           ~ 2841 0
7 NAME G09v1.97 G 08 30 51.0 +01 32 24           ~ 19 0
8 QSO J0831+5245 QSO 08 31 41.7108197808 +52 45 17.616994560   19.2   14.5 13.9 ~ 513 1
9 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2161 1
10 H-ATLAS J090740.0-004200 G? 09 07 40.0 -00 42 00           ~ 28 0
11 H-ATLAS J091043.0-000322 G? 09 10 43.1 -00 03 21           ~ 26 0
12 [CNG2015] PLCK G200.6+46.1 LeG 09 32 23.67 +27 25 00.0           ~ 4 0
13 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5583 6
14 ICRF J103351.4+605107 Sy1 10 33 51.4290959304 +60 51 07.334442756   19.31 18.86 20.24   ~ 142 2
15 QSO B1036+054 QSO 10 38 46.7806935744 +05 12 29.092057884   20.21 19.45 19.53   ~ 93 1
16 4C 06.41 BLL 10 41 17.1625746528 +06 10 16.926043944   16.86 16.70 16.14   ~ 289 1
17 QSO B1042+071 QSO 10 44 55.9117167744 +06 55 38.254341432   19.81 19.35     ~ 65 1
18 6C 104451+715930 QSO 10 48 27.6198768456 +71 43 35.939809416     19.0 17.49   ~ 202 1
19 [CNG2015] PLCK G145.2+50.9 LeG 10 53 22.56 +60 51 49.0           ~ 7 0
20 [CNG2015] PLCK G244.8+54.9 LeG 10 53 53.04 +05 56 21.0           ~ 13 0
21 4C 01.28 BLL 10 58 29.6054370384 +01 33 58.820502924   18.74 18.28 16.68   ~ 706 2
22 PCCS1 857 G165.65+67.01 LeG 11 27 14.60 +42 28 25.0           ~ 12 0
23 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1618 0
24 [CNG2015] PLCK G138.6+62.0 LeG 12 02 07.68 +53 34 40.0           ~ 5 0
25 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 452 2
26 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1894 3
27 NAME NCv1.143 G 12 56 32.544 +23 36 27.63           ~ 15 0
28 IC 883 SBG 13 20 35.380 +34 08 21.84   14.8       ~ 384 1
29 [CNG2015] PLCK G113.7+61.0 LeG 13 23 02.88 +55 36 01.0           ~ 4 0
30 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2385 2
31 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 618 0
32 [CNG2015] PLCK G045.1+61.1 LeG 15 02 36.04 +29 20 51.0           ~ 6 0
33 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2822 4
34 PCCS1 857 G092.47+42.88 G 16 09 17.76 +60 45 21.0           ~ 8 0
35 ICRF J163813.4+572023 Sy1 16 38 13.4562758136 +57 20 23.980140888     17.0 16.94   ~ 327 1
36 4C 69.21 QSO 16 42 07.8484347528 +68 56 39.767837172   19.723   19.219   ~ 291 1
37 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1556 2
38 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12907 0
39 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 139 0
40 4C 09.57 BLL 17 51 32.8186120872 +09 39 00.728629416   17.46 16.78 15.57   ~ 877 1
41 QSO J2015+371 BLL 20 15 28.7286181152 +37 10 59.514330396     21.82 21.4   ~ 265 2
42 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 752 0
43 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2372 2
44 NAME Eyelash LeG 21 35 11.60 -01 02 52.0           ~ 208 0
45 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2662 2

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2022.05.24-12:12:31

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