Discovery of Hot Gas in Outflow in NGC 3379

G. Trinchieri; S. Pellegrini; G. Fabbiano; R. Fu; Nicola Brassington; A. Zezas; D.-W. Kim; J. Gallagher; L. Angelini; R. L. Davies; V. Kalogera; A.R. King; S. Zepf

doi:10.1086/592287

Discovery of Hot Gas in Outflow in NGC 3379

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

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Abstract

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 Msolar. 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 language	English
Pages (from-to)	1000-1008
Number of pages	9
Journal	The Astrophysical Journal
Volume	688
Issue number	2
DOIs	https://doi.org/10.1086/592287
Publication status	Published - 1 Dec 2008

Keywords

Galaxies: Elliptical and Lenticular, cD, Galaxies: Individual: NGC Number: NGC 3379, X-Rays: Galaxies, X-Rays: ISM

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title = "Discovery of Hot Gas in Outflow in NGC 3379",

abstract = "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 Msolar. 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. ",

keywords = "Galaxies: Elliptical and Lenticular, cD, Galaxies: Individual: NGC Number: NGC 3379, X-Rays: Galaxies, X-Rays: ISM",

author = "G. Trinchieri and S. Pellegrini and G. Fabbiano and R. Fu and Nicola Brassington and A. Zezas and D.-W. Kim and J. Gallagher and L. Angelini and Davies, {R. L.} and V. Kalogera and A.R. King and S. Zepf",

year = "2008",

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doi = "10.1086/592287",

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T1 - Discovery of Hot Gas in Outflow in NGC 3379

AU - Trinchieri, G.

AU - Pellegrini, S.

AU - Fabbiano, G.

AU - Fu, R.

AU - Brassington, Nicola

AU - Zezas, A.

AU - Kim, D.-W.

AU - Gallagher, J.

AU - Angelini, L.

AU - Davies, R. L.

AU - Kalogera, V.

AU - King, A.R.

AU - Zepf, S.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - 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 Msolar. 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.

AB - 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 Msolar. 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.

KW - Galaxies: Elliptical and Lenticular, cD, Galaxies: Individual: NGC Number: NGC 3379, X-Rays: Galaxies, X-Rays: ISM

U2 - 10.1086/592287

DO - 10.1086/592287

M3 - Article

SN - 0004-637X

VL - 688

SP - 1000

EP - 1008

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

Discovery of Hot Gas in Outflow in NGC 3379

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