{
  "id": "2406.03031",
  "version": "v1",
  "published": "2024-06-05T07:59:18.000Z",
  "updated": "2024-06-05T07:59:18.000Z",
  "title": "Galactic Cirri at High Galactic Latitudes: I. Investigating Scatter in Slopes between Optical and far-Infrared Intensities",
  "authors": [
    "Yunning Zhao",
    "Wei Zhang",
    "Lin Ma",
    "Shiming Wen",
    "Hong Wu"
  ],
  "comment": "26 pages, 16 figures, 2 tables. Accepted for publication in AJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Based on the slopes between DESI $g,r$ and IRAS 100 $\\mu m$ intensities, specifically $k_{g}$ and $k_{r}$, we have constructed a substantial sample of Galactic cirri. This sample covers 561.25 deg$^2$ at high Galactic latitudes (|b| $\\geq$ 30$^{\\circ}$), allowing for a systematic study of the physical parameters of the Galactic cirrus on a large scale, such as $g-r$ color, dust temperature, asymmetry factor and albedo. The ratio of $k_{g}$ and $k_{r}$ is consistent with the diffuse Galactic starlight model, suggesting that the diffuse starlight within our own Galaxy serves as the primary illumination source for the cirrus. Both $k_{g}$ and $k_{r}$ decrease slowly with increasing Galactic latitudes and IRAS 100 $\\mu m$ intensities, while they do not have a correlation with Galactic longitudes. The distribution of $k_{g}$ and $k_{r}$ confirms a significant scatter in the slopes, reaching a factor of 4-5. Such large scatter cannot be explained by the weak correlation between the slopes and Galactic latitudes and IRAS 100 $\\mu m$ intensities. Instead, it is attributed to substantial variations in the intrinsic properties of the dust, e.g., asymmetry factor and albedo. We propose that the properties of dust particles play a critical role in the observed scatter in slopes, making them the primary contributing factors. Moreover, the variations in dust properties within the cirrus are localized rather than exhibiting large-scale gradients.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-06-05T07:59:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high galactic latitudes",
      "galactic cirrus",
      "far-infrared intensities",
      "investigating scatter",
      "asymmetry factor"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 26,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}