Combing PPAk Integral Field Spectroscopy and PACS-Herschel data: a multi-wavelength study of dust properties in spiral disks
Abstract
The analysis of the effects of dust emission and absorption on the spectral energy distributions (SEDs) of galaxies provides fundamental clues to better understand the distribution and physical properties (e.g. temperature, composition, mass) of interstellar dust in galaxies and of the stellar populations whose light attenuates. The main strength of this work is the availability of both optical 2D spectroscopy data obtained with the CAHA 3.5 m telescope PMAS/PPAk IFU and far infrared (FIR) imaging data from the PACS/Herschel instrument for a subset of galaxies from the Herschel Reference Survey. We have focused our study on the isolated spiral galaxy NGC5668 and on the galaxy pair NGC3395/NGC3396. We investigate the distribution and physical properties of interstellar dust and the chemical composition of the gas by combining this unprecedented dataset, covering from the UV to the sub-millimeter. These data allow us to also determine the attenuation (and oxygen gas-phase abundances), from the PPAk data-cubes, and compare it with the dust-attenuation of the stellar continuum from the combination of PACS/Herschel FIR and GALEX UV data with spatial resolution. In particular, the joint analysis of the stellar-continuum and ionized-gas attenuation allow us to investigate (1) potential variations in the relative geometry of young stars and dust or in the extinction curve, (2) the dependence of the stellar-continuum to ionized-gas attenuation ratio with the amount of attenuation and with the ionized-gas metallicity as derived from purely energy-budget arguments and from full spectral fitting using CIGALE.
- Publication:
-
Highlights of Spanish Astrophysics VIII
- Pub Date:
- May 2015
- Bibcode:
- 2015hsa8.conf..374M