The X-ray Faint Early-Type Galaxy NGC4697
arXiv:astro-ph/0007408 · doi:10.1086/317196
Abstract
We analyze archival ROSAT HRI, ROSAT PSPC, and ASCA data of the X-ray faint early-type galaxy NGC4697. The joint ROSAT PSPC + ASCA spectrum is fit by a two-component thermal model, a MEKAL model with kT_{MEKAL}=0.26^{+0.04}_{-0.03} keV with low metallicity and a bremsstrahlung model with kT_{BREM}=5.2^{+3.0}_{-1.6} keV. A similar model was found to fit the spectra of another faint early-type galaxy (NGC4382) and the bulge of M31. We interpret this soft emission as a combination of emission from a soft component of low mass X-ray binaries (LMXBs) and from a low temperature interstellar medium, although the relative contributions of the two components could not be determined. Twelve point sources were identified within 4' of NGC4697, of which 11 are most likely LMXBs associated with the galaxy. The soft X-ray colors of four of the LMXBs in NGC4697 support the claim that LMXBs possess a soft spectral component. Finally, we present a simulation of what we believe the Chandra data of NGC4697 will look like.
10 pages, uses emulateapj.sty, accepted by Astrophysical Journal
References in corpus (2)
Cited by in corpus (9)
- A Catalogue and Analysis of X-ray luminosities of Early-type galaxies
- Chandra X-ray Observations of the X-ray Faint Elliptical Galaxy NGC 4697
- The X-ray Globular Cluster Population in NGC 1399
- Chandra X-ray Observations of NGC 1316 (Fornax A)
- Resolving the Mystery of X-ray Faint Elliptical Galaxies: Chandra X-ray Observations of NGC 4697
- Dark matter content and internal dynamics of NGC 4697: NMAGIC particle models from slit data and planetary nebulae velocities
- The isolated elliptical NGC 4555 observed with Chandra
- On the Integrated Spectrum of the X-ray Binaries and the Origin of Soft X-ray Emission from the Bulge of M31
- The Abundance Pattern of O, Ne, Mg, and Fe in the Interstellar Medium of S0 Galaxy NGC 4382 Observed with Suzaku