Dust extinction and X-ray emission from the star burst galaxy NGC 1482

TL;DR

This study investigates dust extinction properties and X-ray emission in the starburst galaxy NGC 1482, revealing dust characteristics similar to the Milky Way and suggesting a merger origin for the dust.

Contribution

It provides the first detailed multiwavelength analysis of dust extinction and its relation to X-ray emission in NGC 1482, highlighting the dust's Galactic-like properties and potential merger origin.

Findings

Dust lanes extend up to 11 kpc along the galaxy's major axis.

The extinction curve matches the Galactic curve with RV=3.05.

The total dust mass is estimated at approximately 2.7 x 10^5 solar masses.

Abstract

We present the results based on multiwavelength imaging observations of the prominent dust lane starburst galaxy NGC 1482 aimed to investigate the extinction properties of dust existing in the extreme environment. (B-V) colour-index map derived for the starburst galaxy NGC 1482 confirms two prominent dust lanes running along its optical major axis and are found to extend up to \sim 11 kpc. In addition to the main lanes, several filamentary structures of dust originating from the central starburst are also evident. Though, the dust is surrounded by exotic environment, the average extinction curve derived for this target galaxy is compatible with the Galactic curve, with RV =3.05, and imply that the dust grains responsible for the optical extinction in the target galaxy are not really different than the canonical grains in the Milky Way. Our estimate of total dust content of NGC 1482 assuming screening effect of dust is \sim 2.7 \times 10^5 Msun, and provide lower limit due to the fact that our method is not sensitive to the intermix component of dust. Comparison of the observed dust in the galaxy with that supplied by the SNe to the ISM, imply that this supply is not sufficient to account for the observed dust and hence point towards the origin of dust in this galaxy through a merger like event. Our multiband imaging analysis reveals a qualitative physical correspondence between the morphologies of the dust and H{\alpha} emission lines as well as diffuse X-ray emission in this galaxy. continue.... for more detail please see in pdf file.