Optical spectroscopy of the ROSAT X-ray brightest clusters - II

Crawford, C. S.; Edge, A. C.; Fabian, A. C.; Allen, S. W.; Böhringer, H.; Ebeling, H.; McMahon, R. G.; Voges, W.

doi:10.1093/mnras/274.1.75

Cited by 90 publications

(70 citation statements)

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“…This image shows two BCGs, indicated with green circles, consistent with two merging subclusters. The SW BCG was identified by Crawford et al (1995), with a reported redshift of z=0.109 (although this redshift is described as "provisional" due to poor S/N). Both of the optical galaxy density peaks and both BCGs lie on the merger axis, at larger radii than the X-ray peaks, and separated from one another by roughly 500 kpc in projection.…”

Section: Cluster Dynamical Statementioning

confidence: 99%

Multi-Wavelength Observations of the Dissociative Merger in the Galaxy Cluster Ciza J0107.7+5408

Randall

Weeren

Intema

et al. 2016

ApJ

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We present results based on X-ray, optical, and radio observations of the massive galaxy cluster CIZA J0107.7+5408. We find that this system is a post-core-passage, dissociative, binary merger, with the optical galaxy density peaks of each subcluster leading their associated X-ray emission peaks. This separation occurs because the diffuse gas experiences ram pressure forces, while the effectively collisionless galaxies (and presumably their associated dark matter (DM) halos) do not. This system contains double-peaked diffuse radio emission,possibly a double radio relic with the relics lying along the merger axis and also leading the X-ray cores. We find evidence for a temperature peak associated with the SW relic, likely created by the same merger shock that is powering the relic radio emission in this region. Thus, this system is a relatively rare, clean example of a dissociative binary merger, which can in principle be used to place constraints on the self-interaction cross-section of DM. Low-frequency radio observations reveal ultra-steep spectrum diffuse radio emission that is not correlated with the X-ray, optical, or high-frequency radio emission. We suggest that these sources are radio phoenixes, which are preexisting nonthermal particle populations that have been re-energized through adiabatic compression by the same merger shocks that power the radio relics. Finally, we place upper limits on inverse Compton emission from the SW radio relic.

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Section: Cluster Dynamical Statementioning

confidence: 99%

Multi-Wavelength Observations of the Dissociative Merger in the Galaxy Cluster Ciza J0107.7+5408

Randall

Weeren

Intema

et al. 2016

ApJ

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“…Katgert et al 1996; (5) Quintana & Ramirez 1995;(6) Fetisova et al 1993;(7) Da Costa et al 1991;(8) H. Andernach 1989, private communication of redshifts in a heliocentric frame, based on an upgrade of the compilation in Andernach & Tago 1998;(9) Crawford et al 1995;(10) Huchra et al 1999;(11) Shectman 1985;(12) Mazure et al 1996;(13) Collins et al 1995;(14) Dalton et al 1997;(15) De Vaucouleurs et al 1991;(16) Stocke et al 1991;(17) Postman et al 1992;(18) Abell et al 1989;(19) Katgert et al 1998;(20) Ebeling & Maddox 1995;(21) Muriel et al 1995;(22) Shectman et al 1996;(23) ...…”

Section: Sourcementioning

confidence: 99%

The ROSAT All‐Sky Survey: a Catalog of Clusters of Galaxies in a Region of 1 steradian around the South Galactic Pole

Cruddace

Voges

Böhringer

et al. 2002

ASTROPHYS J SUPPL S

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A field of 1.013 sr in the ROSAT All-Sky Survey (RASS), centered on the south Galactic pole (SGP), has been searched in a systematic, objective manner for clusters of galaxies. The procedure relied on a correlation of the X-ray positions and properties of ROSAT sources in the field with the distribution of galaxies in the COSMOS digitized database, which was obtained from scanning the plates of the UK Schmidt IIIa-J optical survey of the southern sky. The study used the second ROSAT survey database (RASS-2) and included several optical observing campaigns to measure cluster redshifts. The search, which is a precursor to the larger REFLEX survey encompassing the whole southern sky, reached the detection limits of both the RASS and the COSMOS data and yielded a catalog of 186 clusters in which the lowest flux is 1:5 Â 10 À12 ergs cm À2 s À1 in the 0.1-2.4 keV band. Of these 157 have measured redshifts. Using a flux limit of 3:0 Â 10 À12 ergs cm À2 s À1 a complete subset of 112 clusters was obtained, of which 110 have measured redshifts. The spatial distribution of the X-ray clusters out to a redshift of 0.15 shows an extension of the Local Supercluster to the Pisces-Cetus supercluster ðz <$ 0:07Þ, and an orthogonal structure at higher redshift ð0:07 < z < 0:15Þ. This result is consistent with large-scale structure suggested by optical surveys.

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“…Using the NED database 2 we searched for other galaxies with measured redshifts within a radius of one degree from the center of each target cluster. This allowed us to add one more velocity to A1035 (Batuski et al 1991), three to A1413 (Stocke et al 1991;Allen et al 1992), one to A1045 (Allen et al 1992), sixteen to A1831 (NED 1992 andOwen et al 1995), two to A2034 (Crawford et al 1995), four to A195 (Giovanelli & Haynes 1993), four to A2245 (from Rhee & Katgert (1988) …”

Section: Velocity Analysis Of the Clustersmentioning

confidence: 99%

“…Correlations between intrinsic parameters have effectively been found for galaxy clusters, as for instance between richness and velocity dispersion (Danese et al 1980;Cole 1989), and between radius Send offprint requests to: S. Maurogordato Based on observations made at Haute-Provence Observatory, CNRS, France. and luminosity (West et al 1989).…”

Section: Introductionmentioning

confidence: 99%

A sample of galaxy clusters to study the fundamental plane: Redshift measurements

Maurogordato

Proust

Cappi³

et al. 1997

Astron. Astrophys. Suppl. Ser.

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Optical spectroscopy of the ROSAT X-ray brightest clusters - II

Cited by 90 publications

References 0 publications

Multi-Wavelength Observations of the Dissociative Merger in the Galaxy Cluster Ciza J0107.7+5408

Multi-Wavelength Observations of the Dissociative Merger in the Galaxy Cluster Ciza J0107.7+5408

The ROSAT All‐Sky Survey: a Catalog of Clusters of Galaxies in a Region of 1 steradian around the South Galactic Pole

A sample of galaxy clusters to study the fundamental plane: Redshift measurements

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