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Data: CH3OH_I, CH3OH_II

CHE15 - Detection of a Methanol Megamaser in a Major-Merger Galaxy

Short title: Chen et al. (2015)
Authors: Chen, Xi Ellingsen, Simon P. Baan, Willem A. Qiao, Hai-Hua Li, Juan An, Tao Breen, Shari L.
Journal: The Astrophysical Journal Letters, Volume 800, Issue 1, article id. L2, 5 pp. (2015).
Bibcode: 2015ApJ...800L...2C

PDF: CHE15.pdf

• Target type: Extragalactic
  Transitions: SiO_1-0v0,CH3OH_25-30_GHz(I),CH3OH_36(I),CH3OH_44(I),CH3OH_84(I),CH3OH_95(I),CH3OH_6(II),CH3OH_37(II),CH3OH_38(II)
  

• Abstract

  We have detected emission from both the {{4}-1}\to {{3}0} E (36.2 GHz) class I and {{7}-2}\to {{8}-1} E (37.7 GHz) class II methanol transitions toward the center of the closest ultra-luminous infrared galaxy Arp 220. The emission in both methanol transitions shows narrow spectral features and has luminosities approximately 8 orders of magnitude stronger than those observed from typical class I methanol masers observed in Galactic star formation regions. The emission is also orders of magnitude stronger than the expected intensity of thermal emission from these transitions and based on these findings we suggest that the emission from the two transitions are masers. These observations provide the first detection of a methanol megamaser in the 36.2 and 37.7 GHz transitions and represent only the second detection of a methanol megamaser, following the recent report of an 84 GHz methanol megamaser in NGC 1068. We find that the methanol megamasers are significantly offset from the nuclear region and arise toward regions where there is Halpha emission, suggesting that they are associated with starburst activity. The high degree of correlation between the spatial distribution of the 36.2 GHz methanol and X-ray plume emission suggests that the production of strong extragalactic class I methanol masers is related to galactic-outflow-driven shocks and perhaps cosmic rays. In contrast to OH and H2O megamasers which originate close to the nucleus, methanol megamasers provide a new probe of feedback (e.g., outflows) processes on larger scales and of star formation beyond the circumnuclear starburst regions of active galaxies. eprintid: arXiv:1501.05412

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DSS colored 2MASS colored WISE colored SDSS color IRAC color I1,I2,I4 GLIMPSE 360 PACS color (70-160 um) SPIRE color (250-500 um) NVSS (1.4GHz) ATLASGAL 870 um ATLASGAL 870 um + Planck Bolocam 1.1 mm UKIDSS K 2MASS K