The dark matter halo structure of "fossil" groups candidates

T. Yoshioka, Akihiro Furuzawa, S. Takahashi, Y. Tawara, S. Sato, K. Yamashita, Y. Kumai

研究成果: Article

30 引用 (Scopus)

抄録

We investigated properties of four isolated giant elliptical galaxies with extended X-ray halo using ASCA data, The derived size of X-ray halo, X-ray luminosity, and gravitational mass of the dark halo are unusually large those of X-ray halo of a single galaxy, but are typical for X-ray halos of groups and poor clusters of galaxies. The measured temperatures and abundances of the X-ray halo gas in these galaxies are also similar to those of the groups and poor clusters. Based on these results we identified these galaxies as "isolated X-ray overluminous elliptical galaxy" (IOLEG). The radial profiles of dark halo in these objects were derived from X-ray data. It is found that some are similar to those of compact groups while others are the same as those of normal ellipticals. The dark halos of lOLEGs are thus indistinguishable from those of groups (and poor clusters), which appears to be consistent with a widely believed idea that lOLEGs are a product of dynamical evolution of a compact group. However, mass-to-light ratios of IOLEGs (M 200 /L B ∼ 100-1000) are far greater than those of Hickson compact groups M 200 /J B ∼ 40-60). Since it is hard to consider that total optical luminosity of a compact group decreases by an order of magnitude in the course of dynamical evolution, such difference in the observed mass-to-light ratio between IOLEGs and Hickson compact groups strongly suggests that most IOLEGs have not evolved from compact groups which are observed at present.

元の言語English
ページ(範囲)2525-2529
ページ数5
ジャーナルAdvances in Space Research
34
発行部数12 SPEC.ISS.
DOI
出版物ステータスPublished - 01-01-2004

Fingerprint

fossils
Galaxies
halos
dark matter
fossil
X rays
x rays
galaxies
mass to light ratios
elliptical galaxies
Luminance
luminosity
Gases
gas
products
profiles
gases

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

これを引用

Yoshioka, T., Furuzawa, A., Takahashi, S., Tawara, Y., Sato, S., Yamashita, K., & Kumai, Y. (2004). The dark matter halo structure of "fossil" groups candidates. Advances in Space Research, 34(12 SPEC.ISS.), 2525-2529. https://doi.org/10.1016/j.asr.2003.03.076
Yoshioka, T. ; Furuzawa, Akihiro ; Takahashi, S. ; Tawara, Y. ; Sato, S. ; Yamashita, K. ; Kumai, Y. / The dark matter halo structure of "fossil" groups candidates. :: Advances in Space Research. 2004 ; 巻 34, 番号 12 SPEC.ISS. pp. 2525-2529.
@article{1b13202a714e4ba998541bbd9816815e,
title = "The dark matter halo structure of {"}fossil{"} groups candidates",
abstract = "We investigated properties of four isolated giant elliptical galaxies with extended X-ray halo using ASCA data, The derived size of X-ray halo, X-ray luminosity, and gravitational mass of the dark halo are unusually large those of X-ray halo of a single galaxy, but are typical for X-ray halos of groups and poor clusters of galaxies. The measured temperatures and abundances of the X-ray halo gas in these galaxies are also similar to those of the groups and poor clusters. Based on these results we identified these galaxies as {"}isolated X-ray overluminous elliptical galaxy{"} (IOLEG). The radial profiles of dark halo in these objects were derived from X-ray data. It is found that some are similar to those of compact groups while others are the same as those of normal ellipticals. The dark halos of lOLEGs are thus indistinguishable from those of groups (and poor clusters), which appears to be consistent with a widely believed idea that lOLEGs are a product of dynamical evolution of a compact group. However, mass-to-light ratios of IOLEGs (M 200 /L B ∼ 100-1000) are far greater than those of Hickson compact groups M 200 /J B ∼ 40-60). Since it is hard to consider that total optical luminosity of a compact group decreases by an order of magnitude in the course of dynamical evolution, such difference in the observed mass-to-light ratio between IOLEGs and Hickson compact groups strongly suggests that most IOLEGs have not evolved from compact groups which are observed at present.",
author = "T. Yoshioka and Akihiro Furuzawa and S. Takahashi and Y. Tawara and S. Sato and K. Yamashita and Y. Kumai",
year = "2004",
month = "1",
day = "1",
doi = "10.1016/j.asr.2003.03.076",
language = "English",
volume = "34",
pages = "2525--2529",
journal = "Advances in Space Research",
issn = "0273-1177",
publisher = "Elsevier Limited",
number = "12 SPEC.ISS.",

}

Yoshioka, T, Furuzawa, A, Takahashi, S, Tawara, Y, Sato, S, Yamashita, K & Kumai, Y 2004, 'The dark matter halo structure of "fossil" groups candidates', Advances in Space Research, 巻. 34, 番号 12 SPEC.ISS., pp. 2525-2529. https://doi.org/10.1016/j.asr.2003.03.076

The dark matter halo structure of "fossil" groups candidates. / Yoshioka, T.; Furuzawa, Akihiro; Takahashi, S.; Tawara, Y.; Sato, S.; Yamashita, K.; Kumai, Y.

:: Advances in Space Research, 巻 34, 番号 12 SPEC.ISS., 01.01.2004, p. 2525-2529.

研究成果: Article

TY - JOUR

T1 - The dark matter halo structure of "fossil" groups candidates

AU - Yoshioka, T.

AU - Furuzawa, Akihiro

AU - Takahashi, S.

AU - Tawara, Y.

AU - Sato, S.

AU - Yamashita, K.

AU - Kumai, Y.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - We investigated properties of four isolated giant elliptical galaxies with extended X-ray halo using ASCA data, The derived size of X-ray halo, X-ray luminosity, and gravitational mass of the dark halo are unusually large those of X-ray halo of a single galaxy, but are typical for X-ray halos of groups and poor clusters of galaxies. The measured temperatures and abundances of the X-ray halo gas in these galaxies are also similar to those of the groups and poor clusters. Based on these results we identified these galaxies as "isolated X-ray overluminous elliptical galaxy" (IOLEG). The radial profiles of dark halo in these objects were derived from X-ray data. It is found that some are similar to those of compact groups while others are the same as those of normal ellipticals. The dark halos of lOLEGs are thus indistinguishable from those of groups (and poor clusters), which appears to be consistent with a widely believed idea that lOLEGs are a product of dynamical evolution of a compact group. However, mass-to-light ratios of IOLEGs (M 200 /L B ∼ 100-1000) are far greater than those of Hickson compact groups M 200 /J B ∼ 40-60). Since it is hard to consider that total optical luminosity of a compact group decreases by an order of magnitude in the course of dynamical evolution, such difference in the observed mass-to-light ratio between IOLEGs and Hickson compact groups strongly suggests that most IOLEGs have not evolved from compact groups which are observed at present.

AB - We investigated properties of four isolated giant elliptical galaxies with extended X-ray halo using ASCA data, The derived size of X-ray halo, X-ray luminosity, and gravitational mass of the dark halo are unusually large those of X-ray halo of a single galaxy, but are typical for X-ray halos of groups and poor clusters of galaxies. The measured temperatures and abundances of the X-ray halo gas in these galaxies are also similar to those of the groups and poor clusters. Based on these results we identified these galaxies as "isolated X-ray overluminous elliptical galaxy" (IOLEG). The radial profiles of dark halo in these objects were derived from X-ray data. It is found that some are similar to those of compact groups while others are the same as those of normal ellipticals. The dark halos of lOLEGs are thus indistinguishable from those of groups (and poor clusters), which appears to be consistent with a widely believed idea that lOLEGs are a product of dynamical evolution of a compact group. However, mass-to-light ratios of IOLEGs (M 200 /L B ∼ 100-1000) are far greater than those of Hickson compact groups M 200 /J B ∼ 40-60). Since it is hard to consider that total optical luminosity of a compact group decreases by an order of magnitude in the course of dynamical evolution, such difference in the observed mass-to-light ratio between IOLEGs and Hickson compact groups strongly suggests that most IOLEGs have not evolved from compact groups which are observed at present.

UR - http://www.scopus.com/inward/record.url?scp=9544257299&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=9544257299&partnerID=8YFLogxK

U2 - 10.1016/j.asr.2003.03.076

DO - 10.1016/j.asr.2003.03.076

M3 - Article

AN - SCOPUS:9544257299

VL - 34

SP - 2525

EP - 2529

JO - Advances in Space Research

JF - Advances in Space Research

SN - 0273-1177

IS - 12 SPEC.ISS.

ER -

Yoshioka T, Furuzawa A, Takahashi S, Tawara Y, Sato S, Yamashita K その他. The dark matter halo structure of "fossil" groups candidates. Advances in Space Research. 2004 1 1;34(12 SPEC.ISS.):2525-2529. https://doi.org/10.1016/j.asr.2003.03.076