Cold galaxies

Rowan-Robinson, M.; Clements, D. L.

doi:10.1093/mnras/stv1762

Cited by 10 publications

(10 citation statements)

References 25 publications

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“…Table 2 shows a comparison of the sky seen at 60 and at 500 µm, as seen in the RIFSCz and HerMES-SWIRE catalogues (Rowan-Robinson et al 2014). The most striking contrasts of 500µm selection, compared to 60 µm selection, are (i) a much higher fraction of high redshift galaxies (as predicted by Franceschini et al 1991), (ii) a much higher fraction of lensed objects (as predicted by Blain et al 2002), (iii) a much higher fraction of galaxies with cool or cold dust (RR et al 2010, Rowan-Robinson and Clements 2015.…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

Extreme submillimetre starburst galaxies

Rowan‐Robinson

Wang

Farrah

et al. 2018

A&A

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We use two catalogues, a Herschel catalogue selected at 500 µm (HerMES) and an IRAS catalogue selected at 60 µm (RIFSCz), to contrast the sky at these two wavelengths. Both surveys demonstrate the existence of "extreme" starbursts, with star-formation rates (SFRs) > 5000M ⊙ yr −1 . The maximum intrinsic star-formation rate appears to be ∼ 30, 000M ⊙ yr −1 . The sources with apparent SFR estimates higher than this are in all cases either lensed systems, blazars, or erroneous photometric redshifts. At redshifts of 3 to 5, the time-scale for the Herschel galaxies to make their current mass of stars at their present rate of star formation ∼ 10 8 yrs, so these galaxies are making a significant fraction of their stars in the current star-formation episode. Using dust mass as a proxy for gas mass, the Herschel galaxies at redshift 3 to 5 have gas masses comparable to their mass in stars. Of the 38 extreme starbursts in our Herschel survey for which we have more complete spectral energy distribution (SED) information, 50% show evidence for QSO-like optical emission, or exhibit AGN dust tori in the mid-infrared SEDs. In all cases however the infrared luminosity is dominated by a starburst component. We derive a mean covering factor for AGN dust as a function of redshift and derive black hole masses and black hole accretion rates. There is a universal ratio of black-hole mass to stellar mass in these high redshift systems of ∼ 10 −3 , driven by the strong period of star-formation and black-hole growth at z = 1 − 5.

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Section: Comparison With Other Studiesmentioning

confidence: 99%

Extreme submillimetre starburst galaxies

Rowan‐Robinson

Wang

Farrah

et al. 2018

A&A

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“…However, the idea of static universe was discarded by Einstein after Hubble's experiment in year 1929. The cosmological constant was not paid attention till the year 1967 [3][4][5] when the loitering in the universe's expansion was observed and to support this a positive cosmological constant was considered. The great discovery in year 1998 [6,7], which confirmed that the universe is accelerating, gave the birth of many theories such as quintessence, K-essence, phantom field based model, Chaplygin gas model, cosmological constant based theories etc.…”

Section: Introductionmentioning

confidence: 99%

Reissner–Nordstrom metric in unimodular theory of gravity

Chaturvedi

Singh

2017

Int. J. Mod. Phys. D

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We study the modified Reissner Nordstrom metric in the unimodular gravity. So far the spherical symmetric Einstein field equation in unimodular gravity has been studied in the absence of any source. We consider static electric and magnetic charge as source. We solve for Maxwell equations in unimodular gravitational background. We show that in unimodular gravity the electromagnetic field strength tensor is modified. We also show that the solution in unimodular gravity differs from the usual R-N metric in Einstein gravity with some corrections. We further study the thermodynamical properties of the R-N black-hole solution in this theory. *

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“…This measurement shows that our motion is characterised by a velocity of v ≃ 384 km/s toward the (l, b) = (264 • , 48 • ) direction. Attempts to obtain this signal in the LSS appeared as early as the 1960s (De Vaucouleurs & Peters 1968), whose efforts increased given the rapidly growing improvements of infra-red and optical galaxy surveys, such as the IRAS PSCz and 2MASS, during the following decades (Yahil et al 1986;Lahav et al 1988;Lynden-Bell et al 1989;Strauss et al 1992;Basilakos & Plionis 1998;Rowan-Robinson et al 2000;Maller et al 2003;Erdoǧdu et al 2006;Basilakos & Plionis 2006;Bilicki et al 2011). The goal, in these cases, was the amplitude and direction of the so-called clustering dipole, which gives a preferred direction in the low-z LSS due to the galaxy clustering responsible for the acceleration of the Local Group, thus allowing one to deter-mine the consistency (and convergence) with the CMB kinematic dipole.…”

Section: Introductionmentioning

confidence: 99%

Is there evidence for anomalous dipole anisotropy in the large-scale structure?

Bengaly

Bernui

Alcaniz

et al. 2016

Mon. Not. R. Astron. Soc.

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We probe the anisotropy of the large-scale structure (LSS) with the WISE-2MASS catalogue. This analysis is performed by a directional comparison of the galaxy number counts through the entire celestial sphere once systematic effects, such as star-galaxy separation and foregrounds contamination, are properly taken into account. We find a maximal hemispherical asymmetry whose dipolar component is A = 0.0507 ± 0.0014 toward the (l, b) = (323• , −5 • ) direction, whose result is consistent with previous estimations of our proper motion in low and intermediate redshifts, as those carried out with Type Ia Supernovae and similar LSS catalogues. Furthermore, this dipole amplitude is statistically consistent (p-value = 0.061) with mock catalogues simulated according to the expected ΛCDM matter density fluctuations, in addition to observational biases such as the incomplete celestial coverage and anisotropic sky exposure. Our results suggest, therefore, that there is no strong evidence for anomalous anisotropy in the LSS, given the limitations and systematics of current data, in the concordance model scenario.

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Cold galaxies

Cited by 10 publications

References 25 publications

Extreme submillimetre starburst galaxies

Extreme submillimetre starburst galaxies

Reissner–Nordstrom metric in unimodular theory of gravity

Is there evidence for anomalous dipole anisotropy in the large-scale structure?

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