The velocity field of clusters of galaxies within 100 megaparsecs. I - Southern clusters

Mould, Jeremy; Akeson, Rachel; Bothun, G.; Han, Maoan; Huchra, J. P.; Roth, Joshua; Schommer, R. A.

doi:10.1086/170806

Cited by 64 publications

(55 citation statements)

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“…inside that ragion is relatively quiescent. This is also seen in the work of Mould et al (1991; who find motion towards the G A (Figure 3), but a relatively quiet field inside 8,000 km/s except for a "hiccup" at the position of the G A.…”

Section: Fundamental Questionssupporting

confidence: 78%

Galaxy Motions in the Nearby Universe

Huchra

1996

Symp. - Int. Astron. Union

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Abstract. In this paper we review the history of the search for and study of the motions of nearby galaxies with respect to the Hubble Flow. The current status of the field is that (1) convincing infall has been detected into dense clusters, especially the Virgo cluster, (2) the microwave background direction is moderately well aligned with the measured flow nearby but not apparently on larger scales, and (3) there is good but not perfect consistency between the nearby density fields and velocity fields. Particular problems exist in the different O's required to fit the density field derived from optically selected and IRAS (60μ) selected galaxy samples.

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Section: Fundamental Questionssupporting

confidence: 78%

Galaxy Motions in the Nearby Universe

Huchra

1996

Symp. - Int. Astron. Union

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“…However, investigations into A 3229 suggest that it is not, in fact, a galaxy cluster. Abell et al (1989) do not assign a redshift in the original identification; Mould et al (1991) assign it a redshift of 0.017 based on a cross-match with the object DC 0410-62 identified by Dressler (1980), while it is reported in the NASA Extragalactic Database as having redshift 0.091923, based on a cross-match with the initial 6dF data release (Jones et al 2004). Examining the redshifts of the nearby galaxies as given by the final version of the 6dF galaxy survey (Jones et al 2009) shows that there is no local overdensity of galaxies at z ≈ 0.09, and that the nearest true galaxy cluster is A 3266, part of the HorologiumReticulum Supercluster (HRS) (Fleenor et al 2005).…”

Section: Other Possible Origins?mentioning

confidence: 99%

Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array

Hurley‐Walker

Johnston‐Hollitt

Ekers

et al. 2015

Monthly Notices of the Royal Astronomical Society

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Recent observations with the Murchison Widefield Array at 185 MHz have serendipitously unveiled a heretofore unknown giant and relatively nearby (z = 0.0178) radio galaxy associated with NGC 1534. The diffuse emission presented here is the first indication that NGC 1534 is one of a rare class of objects (along with NGC 5128 and NGC 612) in which a galaxy with a prominent dust lane hosts radio emission on scales of ∼700 kpc. We present details of the radio emission along with a detailed comparison with other radio galaxies with discs. NGC 1534 is the lowest surface brightness radio galaxy known with an estimated scaled 1.4-GHz surface brightness of just 0.2 mJy arcmin −2 . The radio lobes have one of the steepest spectral indices yet observed: α = −2.1 ± 0.1, and the core to lobe luminosity ratio is <0.1 per cent. We estimate the space density of this low brightness (dying) phase of radio galaxy evolution as 7 × 10 −7 Mpc −3 and argue that normal AGN cannot spend more than 6 per cent of their lifetime in this phase if they all go through the same cycle.

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“…Han, Mould and collaborators also obtained I band TF data for 16 further clusters distributed over much of the sky (Han 1992;Mould et al 1991). This sample of clusters largely overlapped those studied using the IRTF by Aaronson et al (1986,1989), but the I band relation was considered more accurate.…”

Section: {1990mentioning

confidence: 99%

The density and peculiar velocity fields of nearby galaxies

1995

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We review the quantitative science that can be and has been done with redshift and peculiar velocity surveys of galaxies in the nearby universe. After a brief background setting the cosmological context for this work, the rst part of this review focuses on redshift surveys. The practical issues of how redshift surveys are carried out, and how one turns a distribution of galaxies into a smoothed density eld, are discussed. Then follows a description of major redshift surveys that have been done, and the local cosmography out to 8,000 km s 1 that they have mapped. We then discuss in some detail the various quantitative cosmological tests that can be carried out with redshift data. The second half of this review concentrates on peculiar velocity studies, beginning with a thorough review of existing techniques. After discussing the various biases which plague peculiar velocity work, we survey quantitative analyses done with peculiar velocity surveys alone, and nally with the combination of data from both redshift and peculiar velocity surveys. The data presented rule out the standard Cold Dark Matter model, although several variants of Cold Dark Matter with more power on large scales fare better. All the data are consistent with the hypothesis that the initial density eld had a Gaussian distribution, although one cannot rule out broad classes of non-Gaussian models. Comparison of the peculiar velocity and density elds constrains the Cosmological Density Parameter. The results here are consistent with a at universe with mild biasing of the galaxies relative to dark matter, although open universe models are by no means ruled out.

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The velocity field of clusters of galaxies within 100 megaparsecs. I - Southern clusters

Cited by 64 publications

References 0 publications

Galaxy Motions in the Nearby Universe

Galaxy Motions in the Nearby Universe

Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array

The density and peculiar velocity fields of nearby galaxies

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