2013A&A...550A..88W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:21:24

2013A&A...550A..88W - Astronomy and Astrophysics, volume 550A, 88-88 (2013/2-1)

Piecing together the puzzle of NGC 5253: abundances, kinematics and WR stars.

WESTMOQUETTE M.S., JAMES B., MONREAL-IBERO A. and WALSH J.R.

Abstract (from CDS):

We present Gemini-S/GMOS-IFU optical spectroscopy of four regions near the centre of the nearby (3.8Mpc) dwarf starburst galaxy NGC 5253. This galaxy is famous for hosting a radio supernebula containing two deeply embedded massive super star clusters, surrounded by a region of enhanced nitrogen abundance that has been linked to the presence of Wolf-Rayet (WR) stars. We detected 11 distinct sources of red WR bump (CIV) emission over a 20'' (∼350pc) area, each consistent with the presence of ∼1 WCE-type star. WC stars are not found coincident with the supernebula, although WN stars have previously been detected here. We performed a multi-component decomposition of the Hα line across all four fields and mapped the kinematics of the narrow and broad (FWHM=100-250km/s) components. These maps paint a picture of localised gas flows, as part of multiple overlapping bubbles and filaments driven by the star clusters throughout the starburst. We confirm the presence of a strong Hα velocity gradient over ∼4.5" (∼80pc) coincident with the region of N/O enhancement, and high gas density known from previous study, and interpret this as an accelerating ionized gas outflow from the supernebula clusters. We measure the ionized gas abundances in a number of regions in the outer IFU positions and combine these with measurements from the literature to assess the radial abundance distribution. We find that the O/H and N/H profiles are consistent with being flat. Only the central 50pc exhibits the well-known N/O enhancement, and we propose that the unusually high densities/pressures in the supernebula region have acted to impede the escape of metal-enriched hot winds from the star clusters and allow them to mix with the cooler phases, thus allowing these freshly processed chemicals to be seen in the optical.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: kinematics and dynamics - galaxies: dwarf - galaxies: individual: NGC 5253 - galaxies: ISM - galaxies: starburst

VizieR on-line data: <Available at CDS (J/A+A/550/A88): list.dat fits/*>

CDS comments: Table 3 Regions not in Simbad. Components CN not in Simbad.

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1008 0
2 ESO 350-38 AGN 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 289 0
3 QSO B0125-0635 QSO 01 27 35.5241670251 -06 19 35.428005150 14.75 15.05 14.48 14.06 13.70 ~ 89 0
4 BCLMP 38 HII 01 33 43.85 +30 38 45.8     13.9     ~ 8 0
5 LGGS J013344.44+303844.4 WR* 01 33 44.44 +30 38 44.4 17.541 17.467 21.040 18.065 17.789 WC4 13 0
6 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5134 1
7 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1147 3
8 HD 289002 * 06 45 13.3726265810 +02 08 14.688016523 10.06 10.62 10.44     B1 226 0
9 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
10 Mrk 1304 IG 11 42 12.253 +00 20 03.68   14.16 13.67 13.41 13.03 ~ 150 0
11 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 230 0
12 [DAZ2013] 38 Cl* 13 39 55.53 -31 38 29.7           ~ 17 0
13 [DAZ2013] 45 Cl* 13 39 55.58 -31 38 29.4           ~ 14 0
14 [HCG2004] NGC 5253 C 17 Cl* 13 39 55.76 -31 38 31.7           ~ 2 0
15 [HCG2004] NGC 5253 C 21 Cl* 13 39 55.83 -31 38 27.1           ~ 3 0
16 [HCG2004] NGC 5253 C 27 Cl* 13 39 55.9147 -31 38 38.455           ~ 5 0
17 [DAZ2013] 129 Cl* 13 39 55.98 -31 38 31.9           ~ 22 0
18 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1269 4
19 NAME NGC 5353 Radio Supernebula Cl* 13 39 56.007 -31 38 25.00           ~ 46 0
20 [HCG2004] NGC 5253 C 4 H2G 13 39 56.020 -31 38 27.89           ~ 31 0
21 Cl Pismis 24 OpC 17 24 43.0 -34 12 23   11.00 9.6     ~ 106 0
22 NGC 6357 HII 17 26.5 -34 12           ~ 250 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:21:24

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