Discovery of hot gas in outflow in NGC 3379

G. Trinchieri*, S. Pellegrini, G. Fabbiano, R. Fu, N. J. Brassington, A. Zezas, D. W. Kim, J. Gallagher, L. Angelini, R. L. Davies, V. Kalogera, A. R. King, S. Zepf

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We report the discovery of a faint (Lx ∼ 4 ± 1.5 × 1037 ergs s-1, 0.5-2 keV), outflowing gaseous hot interstellar medium (ISM) in NGC 3379. This represents the lowest X-ray luminosity ever measured from a hot phase of the ISM in a nearby early-type galaxy. The discovery of the hot ISM in a very deep Chandra observation was possible thanks to its unique spectral and spatial signatures, which distinguish it from the integrated stellar X-ray emission, responsible for most of the unresolved emission in the Chandra data. This hot component is found in a region of ∼800 pc in radius at the center of the galaxy and has a total mass M ∼ 3 ± 1 × 105 M. Independent theoretical prediction of the characteristics of an ISM in this galaxy, based on the intrinsic properties of NGC 3379, reproduce well the observed luminosity, temperature, and radial distribution and mass of the hot gas, and indicate that the gas is in an outflowing phase, predicted by models but not observed in any system so far.

Original languageEnglish (US)
Pages (from-to)1000-1008
Number of pages9
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2008


  • Galaxies: elliptical and lenticular, cD
  • Galaxies: individual (NGC 3379)
  • X-rays: ISM
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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