Probing Cosmic Dawn: Modelling the Assembly History, SEDs, and Dust Content of Selected z∼9z\sim9 Galaxies

The presence of spectroscopically confirmed Balmer breaks in galaxy spectral energy distributions (SEDs) at $z>9$ provides one of the best probes of the assembly history of the first generations of stars in our Universe. Recent observations of the gravitationally lensed source, MACS 1149_JD1 (JD1), indicate that significant amounts of star formation likely occurred at redshifts as high as $z\simeq15$. The inferred stellar mass, dust mass, and assembly history of JD1, or any other galaxy at these redshifts that exhibits a strong Balmer break, can provide a strong test of our best theoretical models from high-resolution cosmological simulations. In this work, we present the results from a cosmological radiation-hydrodynamics simulation of the region surrounding a massive Lyman-break galaxy. For two of our most massive systems, we show that dust preferentially resides in the vicinity of the young stars thereby increasing the strength of the measured Balmer break such that the simulated SEDs are consistent with the photometry of JD1 and two other $z>9$ systems (GN-z10-3 and GN-z9-1) that have proposed Balmer breaks at high redshift. We find strong variations in the shape and luminosity of the SEDs of galaxies with nearly identical stellar and halo masses, indicating the importance of morphology, assembly history, and dust distribution in making inferences on the properties of individual galaxies at high redshifts. Our results stress the importance that dust may play in modulating the observable properties of galaxies, even at the extreme redshifts of $z>9$.Comment: 16 pages, 13 Figures, Accepted to MNRA

Florida Puts Federal Removal Jurisdiction and the Thirteenth Amendment in the Doghouse

A Florida Supreme Court decision contradicts prior law by finding that, during an attempted removal to federal court, the state trial court did not lose jurisdiction if the removal was improper. The author suggests that imprisonment under the state court\u27s order, while removal was attempted, was a denial of due process. In addition, it is contended that the order compelling the defendants to comply with a personal services contract or face imprisionment for contempt, contravenes the thirteenth amendment

Florida Puts Federal Removal Jurisdiction and the Thirteenth Amendment in the Doghouse

A Florida Supreme Court decision contradicts prior law by finding that, during an attempted removal to federal court, the state trial court did not lose jurisdiction if the removal was improper. The author suggests that imprisonment under the state court\u27s order, while removal was attempted, was a denial of due process. In addition, it is contended that the order compelling the defendants to comply with a personal services contract or face imprisionment for contempt, contravenes the thirteenth amendment

A note on the reported occurrence of steeply-dipping Tertiary beds on Osmiridium Beach, southern Tasmania

The steeply dipping beds at Osmiridi um Beach, southern Tasmania, earlier identified as Tertiary are structurally and stratigraphically continuous with l:he ?Cambrian Pt Vivian Formation. The carbonaceous layers, used to support a Tertiary age, cut across the bedding and postdate some faults in the formation

The baryonic Tully-Fisher relation for different velocity definitions and implications for galaxy angular momentum

We study the baryonic Tully-Fisher relation (BTFR) at z=0 using 153 galaxies from the SPARC sample. We consider different definitions of the characteristic velocity from HI and H-alpha rotation curves, as well as HI line-widths from single-dish observations. We reach the following results: (1) The tightest BTFR is given by the mean velocity along the flat part of the rotation curve. The orthogonal intrinsic scatter is extremely small (6%) and the best-fit slope is 3.85+/-0.09, but systematic uncertainties may drive the slope from 3.5 to 4.0. Other velocity definitions lead to BTFRs with systematically higher scatters and shallower slopes. (2) We provide statistical relations to infer the flat rotation velocity from HI line-widths or less extended rotation curves (like H-alpha and CO data). These can be useful to study the BTFR from large HI surveys or the BTFR at high redshifts. (3) The BTFR is more fundamental than the relation between angular momentum and galaxy mass (the Fall relation). The Fall relation has about 7 times more scatter than the BTFR, which is merely driven by the scatter in the mass-size relation of galaxies. The BTFR is already the "fundamental plane" of galaxy discs: no value is added with a radial variable as a third parameter.Comment: 12 pages, 6 figures, accepted for publication in MNRA

Pre-Devonian stratigraphy and structure of the Prion Beach-Rocky Boat Inlet-Osmiridium Beach coastal section, southern Tasmania

The pre-Devonian stratigraphy of the Prion Beach to Surprise Bay area is composed of four stratigraphic units. The oldest is a (?) Precambrian, slightly metamorphosed, massive dolomite. This is in part the source area for three overlying units of the Denison Group (Late Cambrian to Early Ordovician). The Tyler Creek Beds are highly serpentinitic conglomerate, sandstone and siltstone. The Point Vivian Formation is a sequence of dolomitic siltstone and matrix rich polymictic conglomerates with a wide range of depositional features including channels, graded bedding and slump structures. It was probably deposited in a slope environment. The overlying Wierah Formation (Denison Group) is composed of quartz-rich pebbly sandstones and quartz arenites which formed in a high energy environment possibly above wave base. Two shear zones cut across this stratigraphy producing transposed layers and boudins. At least one of these shear zones was active during sedimentation and forms the western limit of the Point Vivian Formation in this area