Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies

Details Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies

2006-06-20

arxiv.org/abs/astro-ph/0606480v1

Astronomy and Astrophysics

Astrophysics

27 pages, 9 figures (low resolution), accepted for publication in A&A. High resolution version of the paper is available at:

Scientific paper

10.1051/0004-6361:20065002

Aims: We present new radio continuum observations of ten BIMA SONG galaxies, taken at 1.4 GHz with the Very Large Array. These observations allow us to extend the study of the relationships between the radio continuum (RC) and CO emission to 22 CO luminous galaxies for which single dish CO images have been added to interferometric data. New Spitzer infrared (IR) images of six of these galaxies have been released. The analysis of these high resolution images allowed us to probe the RC-IR-CO correlations down to linear scales of a few hundred pc. Results: for the 22 galaxies analysed, the RC-CO correlation on scales from $\sim10$ kpc down to $\sim100$ pc is nearly linear and has a scatter of a factor of two, i.e. comparable to that of the global correlations. There is no evidence for any severe degradation of the scatter below the kpc scale. This also applies to the six galaxies for which high-resolution mid-IR data are available. In the case of NGC 5194, we find that the non-thermal radio spectral index is correlated with the RC/FIR ratio. Conclusions: The scatter of the point-by-point correlations does not increase significantly with spatial resolution. We thus conclude that we have not yet probed the physical scales at which the correlations break down. However, we observe local deviations from the correlations in regions with a high star formation rate, such as the spiral arms, where we observe a flat radio spectrum and a low RC/FIR ratio. In the intra-arm regions and in the peripheral regions of the disk, the RC/FIR is generally higher and it is characterized by a steepening of the radio spectrum.

Affiliated with

Also associated with

No associations

Rating

Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-39582