The Pristine Inner Galaxy Survey (PIGS) VI: Different vertical distributions between two DIBs at 442.8 nm and 862.1 nm - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

The Pristine Inner Galaxy Survey (PIGS) VI: Different vertical distributions between two DIBs at 442.8 nm and 862.1 nm

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He Zhao
  • Function : Author
Morgan Fouesneau
  • Function : Author
Else Starkenburg
  • Function : Author
Federico Sestito
  • Function : Author
Sébastien Fabbro
  • Function : Author
A. B. A. Queiroz
  • Function : Author

Abstract

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 (λ442.8) and 862.1 nm (λ862.1), as well as the dust grains, in a range of latitude spanning ~22 (4 < |b| < 15) toward the Galactic center (|ℓ| < 11). Tight linear intensity correlations can be found between λ442.8, λ862.1, and dust grains for |b| < 12 or E(B - V) > 0.3 mag. For |b| > 12, λ442.8 and λ862.1 present larger relative strength with respect to the dust grains. A systematic variation of the relative strength between λ442.8 and λ862.1 with |b| and E(B - V) concludes that the two DIBs do not share a common carrier. Furthermore, the carrier of λ862.1 is more abundant at high latitudes than that of λ442.8. This work can be treated as an example showing the significance and potentials to the DIB research covering a large latitude range.

Dates and versions

insu-03909772 , version 1 (21-12-2022)

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He Zhao, Mathias Schultheis, Anke Arentsen, Georges Kordopatis, Morgan Fouesneau, et al.. The Pristine Inner Galaxy Survey (PIGS) VI: Different vertical distributions between two DIBs at 442.8 nm and 862.1 nm. Monthly Notices of the Royal Astronomical Society, 2022, ⟨10.1093/mnras/stac3510⟩. ⟨insu-03909772⟩
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