ID: astro-ph/9811080

X-Ray Evidence for Multiphase Hot Gas with Solar Abundances in the Brightest Elliptical Galaxies

November 5, 1998

View on ArXiv

Similar papers 2

New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with Asca

September 2, 1997

88% Match
Kyoko Matsushita, Kazuo Makishima, Etsuko Rokutanda, ... , Ohashi Takaya
Astrophysics

High quality X-ray spectra of NGC 4636 are obtained with ASCA. Theoretical models are found unable to reproduce the data in the Fe-L line region. Spectral data above 1.4 keV indicate that Mg to Si abundance ratio is $\sim 1$ solar. Assuming that the abundance ratios among $\alpha$-elements are the same with the solar ratios, spectral fit with increased systematic error in the 0.4--1.6 keV range gives abundances of $\alpha$-elements and Fe to be both $\sim$ 1 solar by taking o...

Find SimilarView on arXiv

Evolution of Multiphase Hot Interstellar Medium in Elliptical Galaxies

June 5, 1997

88% Match
Yutaka Tokyo Metro. Univ. Fujita, Junji Cray K.K. Fukumoto, Katsuya Osaka Univ. Okoshi
Astrophysics

We present the results of a variety of simulations concerning the evolution of multiphase (inhomogeneous) hot interstellar medium (ISM) in elliptical galaxies. We assume the gases ejected from stars do not mix globally with the circumferential gas. The ejected gas components evolve separately according to their birth time, position, and origin. We consider cases where supernova remnants (SNRs) mix with local ISM. The components with high metal abundance and/or high density co...

Find SimilarView on arXiv

ROSAT Temperatures and Abundances for a Complete Sample of Elliptical Galaxies

July 10, 1996

88% Match
David S. U. of Alabama Davis, Raymond E. III U. of Alabama White
Astrophysics

We determine X-ray temperatures and abundances for elliptical galaxies drawn from a complete, optically selected sample. The optical magnitude-limited sample consists of 43 galaxies, complete to a (corrected) B magnitude of m_B^o=11.36. Of these, 30 have enough X-ray spectral counts to allow temperature determinations. We find that the temperatures of the X-ray emitting gas in these ellipticals are correlated with the central stellar velocity dispersions: T ~ sigma^1.45; this...

Find SimilarView on arXiv

Dark Matter and Metal Abundances in Elliptical Galaxies from X-ray Observations of the Hot ISM

August 19, 1998

88% Match
Michael NASA/GSFC Loewenstein
Astrophysics

I review the results of recent analysis and interpretation of X-ray observations of elliptical galaxies, focusing on elemental abundances and dark matter. The hot ISM is characterized by subsolar Fe abundances and solar Si-to-Fe ratios; and, I compare these with stellar abundances and discuss implications of these measurements. From models constructed to explain X-ray temperatures and their correlation with optical properties in a complete sample of ellipticals, I demonstrate...

Find SimilarView on arXiv

The diverse hot gas content and dynamics of optically similar low-mass elliptical galaxies

June 12, 2012

88% Match
Akos SAO Bogdan, Laurence P. SAO David, Christine SAO Jones, ... , Kraft Ralph P. SAO
High Energy Astrophysical Ph...
Astrophysics of Galaxies

The presence of hot X-ray emitting gas is ubiquitous in massive early-type galaxies. However, much less is known about the content and physical status of the hot X-ray gas in low-mass ellipticals. In the present paper we study the X-ray gas content of four low-mass elliptical galaxies using archival Chandra X-ray observations. The sample galaxies, NGC821, NGC3379, NGC4278, and NGC4697, have approximately identical K-band luminosities, and hence stellar masses, yet their X-ray...

Find SimilarView on arXiv

Hot Gas In and Around Elliptical Galaxies

September 20, 2003

88% Match
William G. University of California, Santa Cruz, CA Mathews, Fabrizio Dipartimento di Astronomia, Universita' di Bologna Brighenti
Astrophysics

We review the origin, evolution and physical nature of hot gas in elliptical galaxies and associated galaxy groups. Unanticipated recent X-ray observations with Chandra and XMM indicate much less cooling than previously expected. Consequently, many long-held assumptions need to be reexamined or discarded and new approaches must be explored. Chief among these are the role of heating by active galactic nuclei, the influence of radio lobes on the hot gas, details of the cooling ...

Find SimilarView on arXiv

Multi-wavelength Cosmological Simulations of Elliptical Galaxies

August 11, 2003

87% Match
Daisuke Swinburne Kawata, Brad K. Swinburne Gibson
Astrophysics

We study the chemodynamical evolution of elliptical galaxies and their X-ray and optical properties using high-resolution cosmological simulations. Our Tree N-body/SPH code includes a self-consistent treatment of radiative cooling, star formation, supernovae feedback, and chemical enrichment. We present a series of LCDM cosmological simulations which trace the spatial and temporal evolution of abundances of heavy element in both the stellar and gas components of galaxies. A g...

Find SimilarView on arXiv

Recent X-ray Observations and the Evolution of Hot Gas in Elliptical Galaxies: Evidence for Circumgalactic Gas

October 18, 1997

87% Match
Fabrizio Brighenti, William G. Mathews
Astrophysics

X-ray emitting gaseous halos, such as that in elliptical galaxies like NGC 4472, cannot have been produced solely from gas expelled from galactic stars. In traditional models for the evolution of hot interstellar gas (cooling flows) in ellipticals, the galaxies are assumed to have been cleared of gas by SNII-driven winds at some early time then gas is subsequently replenished by mass loss from an evolving population of old stars. To test this, we accurately determine the stel...

Find SimilarView on arXiv

ASCA Compilation of X-Ray Properties of Hot Gas in Elliptical Galaxies and Galaxy Clusters: Two Breaks in the Temperature Dependences

November 28, 2004

87% Match
Yasushi Fukazawa, Kazuo Makishima, Takaya Ohashi
Astrophysics

Utilizing ASCA archival data of about 300 objects of elliptical galaxies, groups, and clusters of galaxies, we performed systematic measurements of the X-ray properties of hot gas in their systems, and compiled them in this paper. The steepness of the luminosity--temperature (LT) relation, $L_{\rm X}\propto(kT)^{\alpha}$, in the range of $kT=$1.5--15 keV is $\alpha=3.17\pm0.15$, consistent with previous measurements. In the relation, we find two breaks at around ICM temperatu...

Find SimilarView on arXiv

The properties of cooling flows in X-ray luminous clusters of galaxies

February 28, 2000

87% Match
S. W. IoA, Cambridge Allen
Astrophysics

We discuss the X-ray properties of the cooling flows in a sample of thirty highly X-ray luminous clusters of galaxies observed with the ASCA and ROSAT satellites. We demonstrate the need for multiphase models to consistently explain the spectral and imaging X-ray data for the clusters. The mass deposition rates of the cooling flows, independently determined from the ASCA spectra and ROSAT images, exhibit good agreement and exceed 1000 solar masses per year in the largest syst...

Find SimilarView on arXiv