S. P. Deshmukh, B. T. Tate, N. D. Vagshette, S. K. Pandey, M. K. Patil
We present multiwavelength imagery along with the X-ray emission maps of merger remnant galaxy NGC 1316 to study the content of dust and its association with other phases of ISM. Color-index maps as well as extinction maps derived for this galaxy reveals an intricate and complex morphology of dust i.e., in the inner part it exist in the form of a prominent lane while at about 6--7\,kpc it apparently forms an arc-like pattern extended along the North-East direction. Apart from this, several other clumps and knots are also evident in these maps. Dust emission mapped using \textit{Spitzer} detection at 8 $\mu$m indicate even complex structure its morphology. Extinction curve derived over optical through near-IR bands exhibit identical extinction properties of dust and can be assessed from the parallely running extinction curve with that for the Galaxy. Quantum of dust estimated from optical extinction measurement is found to be 2.13$\times\, 10^5$\Msun\,, while that from IRAS flux densities is 2.11$\times\, 10^6$\Msun\, and from integrated flux densities at 24$\mu$m, 70$\mu$m and 160 $\mu$m from MIPS is 3.2$\times\, 10^7$\Msun\,, significantly larger than the estimates from the optical extinction. High resolution \textit{Chandra} observations of this merger remnant system have provided with an unprecedented look at the complex nature of distribution of X-ray emission that closely matches with that of the ionized gas and to some extent with the dust distribution also. X-ray color-color plot of the 80 resolved X-ray sources within optical D$_{25}$ extent of the galaxy enabled us to separate them in different classes.
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http://arxiv.org/abs/1207.4324
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