2010A&A...520A..82C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET09:03:38

2010A&A...520A..82C - Astronomy and Astrophysics, volume 520, A82-82 (2010/9-2)

Integral-field near-infrared spectroscopy of two blue dwarf galaxies: NGC 5253 and He 2-10.

CRESCI G., VANZI L., SAUVAGE M., SANTANGELO G. and VAN DER WERF P.

Abstract (from CDS):

We present integral field spectroscopy in the near infrared (NIR) of He 2-10 and NGC 5253, two well known nearby dwarf irregular galaxies showing high star-formation rates. Our data provide an unprecedented detailed view of the interstellar medium and star formation in these galaxies, allowing us to obtain spatially resolved information from the NIR emission and absorption line tracers. We study the spatial distribution and kinematics of different components of the interstellar medium (ISM) mostly through the Bracket series lines, the molecular hydrogen spectrum, [FeII] emission, and CO absorptions. Although the ISM is mostly photo-excited, as derived by the [FeII]/Brγ and H2 line ratios, some regions corresponding to non-thermal radio sources show a [FeII]/Brγ excess due to a significant contribution of SN driven shocks. In He 2-10 we find that the molecular gas clouds, as traced by CO(2-1) and H2 infrared line, show consistent morphologies and velocities when studied with the two different tracers. Moreover, there is a clear association with the youngest super star clusters as traced by the ionized gas. In the same galaxy we observe a cavity depleted of gas, which is surrounded by some of the most active regions of star formation, that we interpret as a signature of feedback-induced star formation from older episodes of star formation. Finally, we measured high turbulence in the ISM of both galaxies, σ∼30-80km/s, driven by the high star-formation activity.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: individual: He 2-10 - galaxies: individual: NGC 5253 - galaxies: ISM - galaxies: starburst

Simbad objects: 20

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Number of rows : 20

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2868 2
2 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 492 0
3 [CVS2005] L1 HII 08 36 15.014 -26 24 33.81           ~ 9 0
4 [CVS2005] L2 HII 08 36 15.060 -26 24 33.98           ~ 8 0
5 [KJ99] Knot 3 HII 08 36 15.127 -26 24 34.13           ~ 9 1
6 [CVS2005] L3a NIR 08 36 15.131 -26 24 34.24           ~ 2 0
7 [CVS2005] L3b NIR 08 36 15.153 -26 24 34.10           ~ 2 0
8 [CVS2005] L6 NIR 08 36 15.183 -26 24 34.06           ~ 2 0
9 ESO 495-21 bCG 08 36 15.190 -26 24 33.66 12.04 11.93 11.45 11.09 12.3 ~ 484 3
10 [CVS2005] L4a NIR 08 36 15.218 -26 24 34.00           ~ 4 0
11 [KJ99] Knot 4 HII 08 36 15.22 -26 24 34.3           ~ 9 1
12 [CVS2005] L4b NIR 08 36 15.247 -26 24 34.35           ~ 2 0
13 [CVS2005] L5 HII 08 36 15.308 -26 24 34.61           ~ 8 0
14 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5236 6
15 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 960 2
16 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1247 4
17 NAME NGC 5353 Radio Supernebula Cl* 13 39 56.007 -31 38 25.00           ~ 43 0
18 [HCG2004] NGC 5253 C 4 H2G 13 39 56.020 -31 38 27.89           ~ 31 0
19 [CMB97] NGC 5253-5a Cl* 13 39 56.1 +31 38 24           ~ 3 0
20 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1450 2

    Equat.    Gal    SGal    Ecl

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2019.12.11-09:03:38

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