Intragroup and galaxy-linked diffuse x-ray emission in hickson compact groups

Tyler D. Desjardins, Sarah C. Gallagher, Panayiotis Tzanavaris, John S. Mulchaey, William N. Brandt, Jane C. Charlton, Gordon P. Garmire, Caryl Gronwall, Ann E. Hornschemeier, Kelsey E. Johnson, Iraklis S. Konstantopoulos, Ann I Zabludoff

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Isolated compact groups (CGs) of galaxies present a range of dynamical states, group velocity dispersions, and galaxy morphologies with which to study galaxy evolution, particularly the properties of gas both within the galaxies and in the intragroup medium. As part of a large, multiwavelength examination of CGs, we present an archival study of diffuse X-ray emission in a subset of nine Hickson compact groups (HCGs) observed with the Chandra X-Ray Observatory. We find that seven of the groups in our sample exhibit detectable diffuse emission. However, unlike large-scale emission in galaxy clusters, the diffuse features in the majority of the detected groups are linked to the individual galaxies, in the form of both plumes and halos likely as a result of vigourous star formation or activity in the galaxy nucleus, as well as in emission from tidal features. Unlike previous studies from earlier X-ray missions, HCGs 31, 42, 59, and 92 are found to be consistent with the LX -T relationship from clusters within the errors, while HCGs 16 and 31 are consistent with the cluster LX -σ relation, though this is likely coincidental given that the hot gas in these two systems is largely due to star formation. We find that LX increases with decreasing group H I to dynamical-mass ratio with tentative evidence for a dependence in X-ray luminosity on H I morphology whereby systems with intragroup H I indicative of strong interactions are considerably more X-ray luminous than passively evolving groups. We also find a gap in the LX of groups as a function of the total group specific star formation rate. Our findings suggest that the hot gas in these groups is not in hydrostatic equilibrium and these systems are not low-mass analogs of rich groups or clusters, with the possible exception of HCG 62.

Original languageEnglish (US)
Article number121
JournalAstrophysical Journal
Volume763
Issue number2
DOIs
StatePublished - Feb 1 2013

Fingerprint

galaxies
x rays
gas
hydrostatics
observatory
plume
high temperature gases
star formation
star formation rate
group velocity
mass ratios
set theory
plumes
halos
observatories
examination
luminosity
analogs
nuclei
gases

Keywords

  • galaxies: evolution
  • galaxies: groups: general
  • X-rays: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Desjardins, T. D., Gallagher, S. C., Tzanavaris, P., Mulchaey, J. S., Brandt, W. N., Charlton, J. C., ... Zabludoff, A. I. (2013). Intragroup and galaxy-linked diffuse x-ray emission in hickson compact groups. Astrophysical Journal, 763(2), [121]. https://doi.org/10.1088/0004-637X/763/2/121

Intragroup and galaxy-linked diffuse x-ray emission in hickson compact groups. / Desjardins, Tyler D.; Gallagher, Sarah C.; Tzanavaris, Panayiotis; Mulchaey, John S.; Brandt, William N.; Charlton, Jane C.; Garmire, Gordon P.; Gronwall, Caryl; Hornschemeier, Ann E.; Johnson, Kelsey E.; Konstantopoulos, Iraklis S.; Zabludoff, Ann I.

In: Astrophysical Journal, Vol. 763, No. 2, 121, 01.02.2013.

Research output: Contribution to journalArticle

Desjardins, TD, Gallagher, SC, Tzanavaris, P, Mulchaey, JS, Brandt, WN, Charlton, JC, Garmire, GP, Gronwall, C, Hornschemeier, AE, Johnson, KE, Konstantopoulos, IS & Zabludoff, AI 2013, 'Intragroup and galaxy-linked diffuse x-ray emission in hickson compact groups', Astrophysical Journal, vol. 763, no. 2, 121. https://doi.org/10.1088/0004-637X/763/2/121
Desjardins TD, Gallagher SC, Tzanavaris P, Mulchaey JS, Brandt WN, Charlton JC et al. Intragroup and galaxy-linked diffuse x-ray emission in hickson compact groups. Astrophysical Journal. 2013 Feb 1;763(2). 121. https://doi.org/10.1088/0004-637X/763/2/121
Desjardins, Tyler D. ; Gallagher, Sarah C. ; Tzanavaris, Panayiotis ; Mulchaey, John S. ; Brandt, William N. ; Charlton, Jane C. ; Garmire, Gordon P. ; Gronwall, Caryl ; Hornschemeier, Ann E. ; Johnson, Kelsey E. ; Konstantopoulos, Iraklis S. ; Zabludoff, Ann I. / Intragroup and galaxy-linked diffuse x-ray emission in hickson compact groups. In: Astrophysical Journal. 2013 ; Vol. 763, No. 2.
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