{
  "id": "2405.13669",
  "version": "v1",
  "published": "2024-05-22T14:09:33.000Z",
  "updated": "2024-05-22T14:09:33.000Z",
  "title": "The Kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with JWST/NIRSpec",
  "authors": [
    "Fergus R. Donnan",
    "Dimitra Rigopoulou",
    "Ismael García-Bernete"
  ],
  "comment": "Accepted for publication in MNRAS Letters. Online supplementary material is included",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in the interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditional methods, especially before the advent of the JWST. In this work we employ Principal Component Analysis (PCA) tomography to analyse JWST/NIRSpec IFU data of 3 nearby luminous infrared galaxies (LIRGs), namely, NGC 3256 N, NGC 3256 S and NGC 7469. We detect the signature of rotation in the second principal component of the 3.3 $\\mu$m PAH feature in all three targets. We construct velocity maps from the principal components for the 3.3 $\\mu$m PAH feature, Br$\\beta$ (2.625$\\mu$m) and molecular hydrogen, H$_2$ 1-0 S(1) (2.12$\\mu$m). We find that in each target, the PAHs qualitatively follow the rotation of the galaxy, consistent with the rotational signature derived from Br$\\beta$ and H$_2$. There are however some differences, with the PAH rotation in NGC 3256 N appearing at a different position angle, which suggest differences in the motion of the dust as compared to the gas. This kind of analysis opens a new window into this key component of the ISM.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-05-22T14:09:33.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "polycyclic aromatic hydrocarbons",
      "tomography",
      "kinematics",
      "analyse jwst/nirspec ifu data",
      "pah feature"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}