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
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2010A&A...520A..82C and select 'bookmark this link' or equivalent in the popup menu