2025ApJ...984..161P


Query : 2025ApJ...984..161P

2025ApJ...984..161P - Astrophys. J., 984, 161 (2025/May-2)

The Gaseous Blowout of the 30 Doradus Starburst Region in the LMC.

POUDEL S., HORTON A., VAZQUEZ J., BARGER K.A., CASHMAN F.H., FOX A.J., LEHNER N., LUCCHINI S., KRISHNARAO D., McCLURE-GRIFFITHS N.M., D'ONGHIA E., TUMLINSON J., TULI A.G., SDUN L., GEBHART S., ANTHONY K., COLE B., VAN LOON J.T., ROMAN-DUVAL J., MA Y.K., LYNN C., LEE M.-Y. and LEAHY D.

Abstract (from CDS):

Widespread galactic winds emanate from the Large Magellanic Cloud (LMC), with the 30 Doradus starburst region generating the fastest and most concentrated gas flows. We report on the gas distribution, kinematics, and ionization conditions of the near-side outflow along eight down-the-barrel sightlines using UV absorption-line observations from the Hubble Space Telescope's Ultraviolet Legacy Library of Young Stars as Essential Standards (ULLYSES) program for this region along with H I 21 cm observations from the Parkes Galactic All-Sky Survey (GASS) and Galactic Australian Square Kilometre Array Pathfinder (GASKAP) survey. We find that within Δθ ≲ 1$\mathop{.}\limits^{\unicode{x000B0}}$7 from the center of 30 Doradus, the wind reaches maximum speeds of 100-150 km s–1 from the LMC's disk. The total integrated column densities of low ions (O I, Si II, and Fe II) in the blueshifted wind, up to vLSR = 150 km s–1, are highest near the center and decline radially outward. We estimate an outflow mass of M_outflow, Si ii_ ≈ (5.7-8.6) × 105M⊙, outflow rate of ${\dot{M}}_{{\rm{outflow}}}\gtrsim 0.02{M}_{\odot }\,{\,\rm{yr}\,}^{-1}$, and mass loading factor of η ≳ 0.10 within Δθ ≲ 0$\mathop{.}\limits^{\unicode{x000B0}}$52 from the center of 30 Doradus. The observed ion ratios-together with photoionization modeling-reveal that this wind is roughly 40%-97% photoionized. The metallicities and dust depletion patterns of the high-velocity absorbers at vLSR ≈ +120 km s–1 can be explained by either a foreground Milky Way (MW) halo cloud or an outflow from the LMC. For the high ions, Si IV and C IV are broader and kinematically offset from the low ions, suggesting turbulent mixing layers existing in the wind. Finally, our hydrodynamical simulations of the Magellanic Clouds and MW system suggest that the Magellanic Corona can protect the LMC winds from the ram pressure forces exerted by the MW's halo.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Circumgalactic medium - Galactic winds - Large Magellanic Cloud

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
5 HD 33133 WR* 05 03 08.9126630616 -66 40 57.492259824   12.46 12.63 12.85   WN7h 99 0
6 HD 269357 s*b 05 18 59.4790204920 -69 12 54.801550908   11.89 12.10     O6Ib(f) 63 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 BI 173 * 05 27 09.9440507208 -69 07 56.452079568 11.85 12.86 13.00     O7.5III((f))p 36 0
9 SK -68 112 * 05 31 08.0262480816 -68 36 54.514494900   12.50 12.82     O7.5(f)(n)p 10 0
10 HD 269687 WR* 05 31 25.5247745448 -69 05 38.556251700 10.86 11.78 11.87 12.05   WN11h 122 0
11 BI 214 * 05 34 06.1974529560 -69 25 09.408245340 12.003 13.084 13.236   13.411 O7(f)(n)p 10 0
12 HD 269896 s*b 05 37 49.1356176384 -68 55 01.639049016 11.338 9.493 11.449 11.49   ON9.7Ia+ 102 0
13 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
14 Brey 77 WR* 05 38 42.1044150840 -69 05 55.335965424     12.86   12.79 O2If* 90 0
15 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
16 HD 38282 WR* 05 38 53.3783458680 -69 02 00.895545204   10.98 11.11 11.26   WN5/6h+WN6/7h 192 1
17 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 273 1
18 NAME Gal Center Positive HVC 20 51.2 +01 41           ~ 109 1

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