Search Publications
SALT HRS Discovery of the Binary Nucleus of the Etched Hourglass Nebula MyCn 18
Miszalski, Brent; Manick, Rajeev; Iłkiewicz, Krystian +2 more
The shaping of various morphological features of planetary nebulae is increasingly linked to the role of binary central stars. Identifying a binary within a planetary nebula offers a powerful tool with which to directly investigate the formation mechanisms behind these features. The Etched Hourglass Nebula, MyCn 18, is the archetype for several bi…
Discovery of the Most Ultra-Luminous QSO Using GAIA, SkyMapper, and WISE
Wolf, Christian; Schmidt, Brian P.; Bian, Fuyan +5 more
We report the discovery of the ultra-luminous quasi-stellar object SMSS J215728.21-360215.1 with magnitude z = 16.9 and W4 = 7.42 at redshift 4.75. Given absolute magnitudes of M145, AB = -29.3, M300, AB = -30.12, and logLbol/Lbol, ⊙ = 14.84, it is the quasi-stellar object with the highest unlensed UV-op…
The Data-Driven Approach to Spectroscopic Analyses
Ness, M.
I review the data-driven approach to spectroscopy, The Cannon, which is a method for deriving fundamental diagnostics of galaxy formation of precise chemical compositions and stellar ages, across many stellar surveys that are mapping the Milky Way. With The Cannon, the abundances and stellar parameters from the multitude of stellar surveys can be …
GLACiAR, an Open-Source Python Tool for Simulations of Source Recovery and Completeness in Galaxy Surveys
Trenti, M.; Oesch, P. A.; Carrasco, D. +1 more
The luminosity function is a fundamental observable for characterising how galaxies form and evolve throughout the cosmic history. One key ingredient to derive this measurement from the number counts in a survey is the characterisation of the completeness and redshift selection functions for the observations. In this paper, we present GLACiAR, an …
A New Globular Cluster in the Area of VVVX
Minniti, D.; Bonatto, C.; Bica, E. +1 more
We communicate the discovery of a new globular cluster in the Galaxy that was first detected on WISE/2MASS images and is now confirmed with VVVX photometry. It is a Palomar-like cluster projected at ℓ = 359.15°, b = 5.73°, and may be related to the bulge. We derive an absolute magnitude of MV ≈ -3.3, thus being an underluminous globular…
Bi-Abundance Ionisation Structure of the Wolf-Rayet Planetary Nebula PB 8
Danehkar, A.
The planetary nebula PB 8 around a [WN/WC]-hybrid central star is one of planetary nebulae with moderate abundance discrepancy factors (ADFs 2-3), which could be an indication of a tiny fraction of metal-rich inclusions embedded in the nebula (bi-abundance). In this work, we have constructed photoionisation models to reproduce the optical and infr…
A correlation between GALEX FUV magnitude and chromospheric activity among red giant stars
Smith, Graeme H.
It is shown that upon combining GALEX far-ultraviolet and Johnson B magnitudes a resultant FUV-B colour can be obtained that for red giant stars of luminosity classes III and II correlates well with chromospheric emission in the cores of the Mg II h and k lines. Giant stars throughout the colour range 0.8 ≤ B - V ≤ 1.6 exhibit such a phenomenon. T…
Thermonuclear Burst Observations for Model Comparisons: A Reference Sample
Galloway, Duncan K.; Goodwin, Adelle J.; Keek, Laurens
We present observations of thermonuclear (type-I) X-ray bursts, selected for comparison with numerical models. We provide examples of four distinct cases of ignition: He-ignition in mixed H/He fuel (case 1); He-ignition in pure He fuel, following exhaustion of accreted H by steady burning (case 2); ignition in (almost) pure He accumulated from an …
Unbiased Large Spectroscopic Surveys of Galaxies Selected by SPICA Using Dust Bands
Pozzi, F.; Scott, D.; Wang, L. +27 more
The mid-infrared range contains many spectral features associated with large molecules and dust grains such as polycyclic aromatic hydrocarbons and silicates. These are usually very strong compared to fine-structure gas lines, and thus valuable in studying the spectral properties of faint distant galaxies. In this paper, we evaluate the capability…
Dynamical Study of the Exoplanet Host Binary System HD 106515
Rica, F. M.; Barrena, R.; Henríquez, J. A. +2 more
HD 106515 AB (STF1619 AB) is a high common proper motion and common radial velocity binary star system composed of two G-type bright stars located at 35 pc and separated by about 7 arcsec. This system was observed by the Hipparcos satellite with a precision in distance and proper motion of 3 and 2%, respectively. The system includes a circumprimar…