Search Publications
The fastest travel together: chemical tagging of the fastest stars in Gaia DR2 to the stellar halo
Wyse, Rosemary F. G.; Hawkins, Keith
The fastest moving stars provide insight into several fundamental properties of the Galaxy, including the escape velocity as a function of Galactocentric radius, the total mass, and the nature and frequency of stellar encounters with the central supermassive black hole. The recent second data release of Gaia has allowed the identification of new s…
Candidate high-z protoclusters among the Planck compact sources, as revealed by Herschel-SPIRE
Valtchanov, I.; Clements, D. L.; Harrison, D. L. +19 more
By determining the nature of all the Planck compact sources within 808.4 deg2 of large Herschel surveys, we have identified 27 candidate protoclusters of dusty star-forming galaxies (DSFGs) that are at least 3σ overdense in either 250, 350, or 500 µm sources. We find roughly half of all the Planck compact sources are resolved by H…
3D Asymmetrical motions of the Galactic outer disc with LAMOST K giant stars
Deng, Licai; Carlin, Jeffrey L.; Wang, Haifeng +1 more
We present a three dimensional velocity analysis of Milky Way disc kinematics using LAMOST K giant stars and the GPS1 proper motion catalogue. We find that Galactic disc stars near the anticentre direction (in the range of Galactocentric distance between R = 8 and 13 kpc and vertical position between Z = -2 and 2 kpc) exhibit asymmetrical motions …
First constraints on the stellar mass function of star-forming clumps at the peak of cosmic star formation
Adamo, Angela; Dessauges-Zavadsky, Miroslava
Star-forming clumps dominate the rest-frame ultraviolet morphology of galaxies at the peak of cosmic star formation. If turbulence driven fragmentation is the mechanism responsible for their formation, we expect their stellar mass function to follow a power law of slope close to -2. We test this hypothesis performing the first analysis of the stel…
Dark passengers in stellar surveys
Zhu, Wei; Hotokezaka, Kenta; Beniamini, Paz +1 more
We develop stellar population models to predict the number of binaries with a single luminous member is Gaia and Hipparcos. Our models yield dozens of detections of black hole luminous companion (BHLC) binaries and hundreds to thousands of neutron star luminous companion (NSLC) binaries with Gaia. Interestingly, our models also yield a single dete…
The rate of Type-Ia supernovae in galaxy clusters and the delay-time distribution out to redshift 1.75
Maoz, Dan; Friedmann, Matan
The observed delay-time distribution (DTD) of Type-Ia supernovae (SNe Ia) is a valuable probe of SN Ia progenitors and physics, and of the role of SNe Ia in cosmic metal enrichment. The SN Ia rate in galaxy clusters as a function of cluster redshift is an almost-direct measure of the DTD, but current estimates have been limited out to a mean redsh…
Dust production and depletion in evolved planetary systems
Reach, W. T.; Gänsicke, B. T.; Pala, A. F. +15 more
The infrared dust emission from the white dwarf GD 56 is found to rise and fall by 20 per cent peak-to-peak over 11.2 yr, and is consistent with ongoing dust production and depletion. It is hypothesized that the dust is produced via collisions associated with an evolving dust disc, temporarily increasing the emitting surface of warm debris, and is…
The spectral energy distribution of powerful starburst galaxies - I. Modelling the radio continuum
Callingham, J. R.; Filipović, M. D.; Seymour, N. +24 more
We have acquired radio-continuum data between 70 MHz and 48 GHz for a sample of 19 southern starburst galaxies at moderate redshifts (0.067 < z < 0.227) with the aim of separating synchrotron and free-free emission components. Using a Bayesian framework, we find the radio continuum is rarely characterized well by a single power law, instead …
SPIDERMAN: an open-source code to model phase curves and secondary eclipses
Kreidberg, Laura; Louden, Tom
We present SPIDERMAN (Secondary eclipse and Phase curve Integrator for 2D tempERature MAppiNg), a fast code for calculating exoplanet phase curves and secondary eclipses with arbitrary surface brightness distributions in two dimensions. Using a geometrical algorithm, the code solves exactly the area of sections of the disc of the planet that are o…
Kinematics, turbulence, and star formation of z ∼ 1 strongly lensed galaxies seen with MUSE
Bauer, F. E.; Pelló, R.; Mahler, G. +18 more
We analyse a sample of eight highly magnified galaxies at redshift 0.6 < z < 1.5 observed with MUSE, exploring the resolved properties of these galaxies at sub-kiloparsec scales. Combining multiband HST photometry and MUSE spectra, we derive the stellar mass, global star formation rates (SFRs), extinction and metallicity from multiple nebula…