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The X-ray-faint early-type galaxy NGC 4697

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dc.contributor.authorIrwin, JA
dc.contributor.authorSarazin, CL
dc.contributor.authorBregman, JN
dc.contributor.otherUniversity of Michigan System
dc.contributor.otherUniversity of Michigan
dc.contributor.otherUniversity of Virginia
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2018-09-14T21:45:09Z
dc.date.available2018-09-14T21:45:09Z
dc.date.issued2000-11-20
dc.description.abstractWe analyze archival ROSAT HRI, ROSAT PSPC, and ASCA data of the X-ray-faint early-type galaxy NGC 4697. The joint ROSAT PSPC + ASCA spectrum is fitted by a two-component thermal model, a MEKAL model with kT(MEKAL) = 0.26(-0.03)(+0.04) keV with low metallicity and a bremsstrahlung model with kT(BREM) = 5.2(-1.6)(+3.0) keV. A similar model was found to fit the spectra of another faint early-type galaxy (NGC 4382) 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 NGC 4697, of which 11 are most likely LMXBs associated with the galaxy. The soft X-ray colors of four of the LMXBs in NGC 4697 support the claim that LMXBs possess a soft spectral component. Finally, we present a simulation of what we believe the Chandra data of NGC 4697 will look like.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationIrwin, J., Sarazin, C., Bregman, J. (2000): The X-Ray-Faint Early-Type Galaxy NGC 4697. The Astrophysical Journal Letters, 544(2). DOI: 10.1086/317196
dc.identifier.doi10.1086/317196
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3874
dc.languageEnglish
dc.language.isoen_US
dc.publisherIOP Publishing
dc.subjectbinaries : close
dc.subjectgalaxies : elliptical and lenticular, cD
dc.subjectgalaxies : ISM
dc.subjectX-rays : galaxies
dc.subjectX-rays : ISM
dc.subjectX-rays : stars
dc.subjectGAS IMAGING SPECTROMETER
dc.subjectCCD SURFACE PHOTOMETRY
dc.subjectELLIPTIC GALAXIES
dc.subjectEMISSION MECHANISMS
dc.subjectCOMPLETE SAMPLE
dc.subjectROSAT
dc.subjectASCA
dc.subjectBINARIES
dc.subjectSPECTRA
dc.subjectM31
dc.subjectAstronomy & Astrophysics
dc.titleThe X-ray-faint early-type galaxy NGC 4697en_US
dc.typetext
dc.typeArticle

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