The Pristine Inner Galaxy Survey PIGS VI: Different vertical distributions between two DIBs at 442 8 nm and 862 1 nm by He Zhao et al. on Tuesday 29 November

Although diffuse interstellar bands (DIBs) were discovered over 100 years

ago, for most of them, their origins are still unknown. Investigation on the

correlations between different DIBs is an important way to study the behavior

and distributions of their carriers. Based on stacking thousands of spectra

from the Pristine Inner Galaxy Survey, we study the correlations between two

DIBs at 442.8 nm ($\lambda$442.8) and 862.1 nm ($\lambda$862.1), as well as the

dust grains, in a range of latitude spanning ${\sim}22^{\circ}$

($4^{\circ}\,{<}\,|b|\,{<}\,15^{\circ}$) toward the Galactic center

($|\ell|\,{<}\,11^{\circ}$). Tight linear intensity correlations can be found

between $\lambda$442.8, $\lambda$862.1, and dust grains for

$|b|\,{<}\,12^{\circ}$ or $E(B-V)\,{>}\,0.3$ mag. For $|b|\,{>}\,12^{\circ}$,

$\lambda$442.8 and $\lambda$862.1 present larger relative strength with respect

to the dust grains. A systematic variation of the relative strength between

$\lambda$442.8 and $\lambda$862.1 with $|b|$ and $E(B-V)$ concludes that the

two DIBs do not share a common carrier. Furthermore, the carrier of

$\lambda$862.1 is more abundant at high latitudes than that of $\lambda$442.8.

This work can be treated as an example showing the significance and potentials

to the DIB research covering a large latitude range.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.15224v1