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Search for Alignment of Disk Orientations in Nearby Star-forming Regions: Lupus, Taurus, Upper Scorpius, ρ Ophiuchi, and Orion
Suto, Yasushi; Aizawa, Masataka; Nakazato, Takeshi +2 more
Spatial correlations among protoplanetary disk orientations carry unique information on physics of multiple-star formation processes. We select five nearby star-forming regions that comprise a number of protoplanetary disks with spatially resolved images with ALMA and Hubble Space Telescope, and we search for the mutual alignment of the disk axes.…
Oversized Gas Clumps in an Extremely Metal-poor Molecular Cloud Revealed by ALMA's Parsec-scale Maps
Qiu, Keping; Chen, Yanmei; Zhang, Qizhou +8 more
Metals are thought to have profound effects on the internal structures of the molecular clouds in which stars are born. The absence of metals is expected to prevent gas from efficient cooling and fragmentation in theory. However, this effect has not yet been observed in low-metallicity environments, such as in the early universe and local dwarf ga…
Sudden and steady orbital period changes across the classical nova eruptions of DQ Her and BT Mon
Schaefer, Bradley E.
I report two new measures of the sudden change in the orbital period (P) across the nova eruption (ΔP) and the steady period change in quiescence (\dot{P}) for classical novae (CNe) DQ Her and BT Mon. The fractional changes (ΔP/P) in parts per million (ppm) are -4.46 ± 0.03 for DQ Her and +39.6 ± 0.5 for BT Mon. For BT Mon, the ΔP/P value is not l…
Deep XMM-Newton observations of the most distant SPT-SZ galaxy cluster
Allen, Steven W.; Bayliss, Matthew; Canning, Rebecca E. A. +5 more
We present results from a 577 ks XMM-Newton observation of SPT-CL J0459-4947, the most distant cluster detected in the South Pole Telescope 2500 square degree (SPT-SZ) survey, and currently the most distant cluster discovered through its Sunyaev-Zel'dovich effect. The data confirm the cluster's high redshift, z = 1.71 ± 0.02, in agreement with ear…
An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies
Thomson, A. P.; Ivison, R. J.; Scott, D. +27 more
We analyse 870 µm Atacama Large Millimetre Array (ALMA) dust continuum detections of 41 canonically selected z ≃ 3 Lyman-break galaxies (LBGs), as well as 209 ALMA-undetected LBGs, in follow-up of SCUBA-2 mapping of the UKIDSS Ultra Deep Survey (UDS) field. We find that our ALMA-bright LBGs lie significantly off the local IRX-beta relation a…
Structural analysis of massive galaxies using HST deep imaging at z < 0.5
Lorenzoni, Silvio; Buitrago, Fernando; Matute, Israel +11 more
Context. The most massive galaxies (Mstellar ≥ 1011 M⊙) in the local Universe are characterized by a bulge-dominated morphology and old stellar populations, in addition to being confined to a tight mass-size relation. Identifying their main components can provide insights into their formation mechanisms and subsequ…
Connecting the Local Stellar Halo and Its Dark Matter Density to Dwarf Galaxies via Blue Stragglers
Casagrande, Luca
The Gaia H-R diagram shows the presence of apparently young stars at high tangential velocities. Using a simple analytical model, I show that these stars are likely to be blue stragglers. Once normalized to red giant stars, the fraction of nearby halo blue stragglers is of order 20%, and remarkably close to that measured in dwarf galaxies. Motivat…
Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets
Zhang, J.; Hou, Y. J.; Li, T. +5 more
Context. Penumbral filaments and light bridges are prominent structures inside sunspots and are important for understanding the nature of sunspot magnetic fields and magneto-convection underneath.
Aims: We investigate an interesting event where several penumbral filaments intrude into a sunspot light bridge. In doing so we aim to gain further…
Eta carinae and the homunculus: far infrared/submillimetre spectral lines detected with the Herschel Space Observatory
Gull, T. R.; Nielsen, K. E.; Morris, P. W. +4 more
The evolved massive binary star η Carinae underwent eruptive mass-loss events that formed the complex bi-polar 'Homunculus' nebula harbouring tens of solar masses of unusually nitrogen-rich gas and dust. Despite expectations for the presence of a significant molecular component to the gas, detections have been observationally challenged by limited…
A blinding solution for inference from astronomical data
Sellentin, Elena
This paper presents a joint blinding and deblinding strategy for inference of physical laws from astronomical data. The strategy allows for up to three blinding stages, where the data may be blinded, the computations of theoretical physics may be blinded, and -assuming Gaussianly distributed data - the covariance matrix may be blinded. We found co…