Abstract
A multiwavelength study of a nearby dust lane early-type galaxy IC 5063 is presented. The objectives are to investigate dust extinction properties and the association of interstellar dust with other phases of ISM. The color-index maps as well as the extinction maps derived from the analysis of deep CCD observations in optical passbands revealed a prominent dust lane along its optical major axis in the inner region. In addition, two more fainter and extended dust patterns are apparent in the color index map as well as extinction maps. These features are also evident in the smooth model subtracted residual maps. The extinction curve derived for this galaxy revealed that dust grains in it are identical to the canonical grains in the Milky Way with the dust grains little larger than the canonical grains. The total extinction measured in the V band extinction map enabled us to quantify the dust content of this galaxy to be equal to , an order of magnitude shorter than that estimated using the IRAS flux densities at 60 and 100 μm. A Multiphase ISM study revealed a surprising similarity in the morphologies of the Hα emitting ionized gas distribution and X-ray emitting gas. Systematic analysis of high resolution X-ray observations using Chandra telescope enabled us to detect 18 discrete X-ray sources within optical D25 region of IC 5063, out of which 17 sources were separated out as the low mass X-ray binaries and one as the high mass X-ray binary source in the X-ray color-color plot.
Highlights
Early-type galaxies (ETGs, both elliptical and lenticular collectively) were considered to be old, passive systems with a very low or almost devoid of gas and dust
The extinction curve derived for this galaxy revealed that dust grains in it are identical to the canonical grains in the Milky Way with the dust grains little larger than the canonical grains
This paper presents dust extinction in a prominent dust lane early type galaxy IC 5063 (PKS 2048-57), which has been reported as a strong extended high-excitation optical line emitter and has been detected as a powerful infrared emitter
Summary
Early-type galaxies (ETGs, both elliptical and lenticular collectively) were considered to be old, passive systems with a very low or almost devoid of gas and dust. A large fraction (~50% - 80%) of ETGs, at least in the local universe, are known to host interstellar dust in the form of lanes, filaments and patches, which has been confirmed through the careful analysis of high quality optical CCD imaging observations, thanks to the availability of sensitive array detectors [1] [2] [3] [4] [5] These claims were further confirmed through the multiwavelength observations of these galaxies, in the far-IR and sub-mm regions, investigating the presence of a substantial fraction of cold dust in these galaxies [6] [7]. SAO 12.89 2’.1 × 1’.4 12’ × 8’5 45.3 0.01114 3402 ± 6 1.290 ± 0.024 (12 μm); 4.270 ± 0.030 (24 μm) 5.87 ± 0.038(60 μm); 4.25 ± 0.207 (100 μm) 408 MHz: 6.200 Jy
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