{
  "id": "1402.2483",
  "version": "v2",
  "published": "2014-02-11T13:16:33.000Z",
  "updated": "2014-04-09T15:10:31.000Z",
  "title": "Multiwavelength study of the high-latitude cloud L1642: chain of star formation",
  "authors": [
    "J. Malinen",
    "M. Juvela",
    "S. Zahorecz",
    "A. Rivera-Ingraham",
    "J. Montillaud",
    "K. Arimatsu",
    "J. -Ph. Bernard",
    "Y. Doi",
    "L. Haikala",
    "R. Kawabe",
    "G. Marton",
    "P. McGehee",
    "V. -M. Pelkonen",
    "I. Ristorcelli",
    "Y. Shimajiri",
    "S. Takita",
    "L. V. Toth",
    "T. Tsukagoshi",
    "N. Ysard"
  ],
  "comment": "22 pages, 18 figures, accepted to Astronomy & Astrophysics; abstract shortened and figures reduced for astroph",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "L1642 is one of the two high galactic latitude (|b| > 30deg) clouds confirmed to have active star formation. We examine the properties of this cloud, especially the large-scale structure, dust properties, and compact sources in different stages of star formation. We present high-resolution far-infrared and submm observations with the Herschel and AKARI satellites and mm observations with the AzTEC/ASTE telescope, which we combined with archive data from near- and mid-infrared (2MASS, WISE) to mm observations (Planck). The Herschel observations, combined with other data, show a sequence of objects from a cold clump to young stellar objects at different evolutionary stages. Source B-3 (2MASS J04351455-1414468) appears to be a YSO forming inside the L1642 cloud, instead of a foreground brown dwarf, as previously classified. Herschel data reveal striation in the diffuse dust emission around L1642. The western region shows striation towards NE and has a steeper column density gradient on its southern side. The densest central region has a bow-shock like structure showing compression from the west and a filamentary tail extending towards east. The differences suggest that these may be spatially distinct structures, aligned only in projection. We derive values of the dust emission cross-section per H nucleon for different regions of the cloud. Modified black-body fits to the spectral energy distribution of Herschel and Planck data give emissivity spectral index beta values 1.8-2.0 for the different regions. The compact sources have lower beta values and show an anticorrelation between T and beta. Markov chain Monte Carlo calculations demonstrate the strong anticorrelation between beta and T errors and the importance of mm Planck data in constraining the estimates. L1642 reveals a more complex structure and sequence of star formation than previously known.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-04-09T15:10:31.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "star formation",
      "high-latitude cloud l1642",
      "multiwavelength study",
      "spectral index beta values",
      "markov chain monte carlo calculations"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201323026",
      "journal": "Astronomy and Astrophysics",
      "year": 2014,
      "month": "Mar",
      "volume": 563
    },
    "note": {
      "typesetting": "TeX",
      "pages": 22,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014A&A...563A.125M"
    }
  }
}