12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
Home > Timetable > Session details > Contribution details
PDF | XML | iCal

Properties of the Interstellar medium in nearby galaxies

Presented by Mr. Roger IANJAMASIMANANA on 14 Jul 2011 from 12:00 to 12:15
Type: Oral Presentation
Session: APSS
Track: Track D1 - Astrophysics


<p>We use the HI velocity profi les of The HI Nearby Galaxy Survey (THINGS) to study the phase structure of the ISM and its relation to galaxy properties and morphology. To construct high S/N profiles, we use a method analogous to the stacking method sometimes used in high redshift HI observations. We call these high S/N profi les super pro files. By decomposing the super profiles into Gaussian components, we found broad and narrow components which are evidence of the presence of Cold Neutral Medium (CNM) and Warm Neutral Medium (WNM). We also derive radial super profi les of the THINGS galaxies and we found some correspondance between the shapes of the super profi les and their location within the galaxies. We found that the narrrow components dominate inside the optical radius r25. We also analyze the shapes of the super profi les in low, moderate and high star formation rate (SFR) regions and we found that the narrow component dominates in high SFR regions. The pro files also tend to be more asymmetric and broader in high SFR regions.

Level (Hons, MSc, PhD, other)?


Consider for a student award (Yes / No)?


Short Paper



Room: Acro2

Primary authors