Search Publications
E-XQR-30: The evolution of Mg II, C II, and O I across 2 < z < 6
Lai, Samuel; Bosman, Sarah E. I.; Meyer, Romain A. +12 more
Intervening metal absorbers in quasar spectra at z > 6 can be used as probes to study the chemical enrichment of the Universe during the Epoch of Reionization. This work presents the comoving line densities (dn/dX) of low-ionization absorbers, namely, Mg II (2796 Å), C II (1334 Å), and O I (1302 Å) across 2 < z < 6 using the E-XQR-30 meta…
Hunting down white dwarf-main sequence binaries using multiwavelength observations
Chatterjee, Sourav; Nayak, Prasanta K.; Ganguly, Anindya
Identification of white dwarfs (WD) with main-sequence (MS) companions and characterization of their properties can put important constraints on our understanding of binary stellar evolution and guide the theoretical predictions for a wide range of interesting transient events relevant for, e.g. Rubin Observatory (LSST), ZTF, and LISA. In this stu…
On the natal kick of the black hole X-ray binary H 1705-250
Gandhi, Poshak; Zhao, Yue; Dashwood Brown, Cordelia
When a compact object is formed, an impulse (kick) will be imparted to the system by the mass lost during the core-collapse supernova (SN). A number of other mechanisms may impart an additional kick on the system, although evidence for these natal kicks in black hole systems remains limited. Updated Gaia astrometry has recently identified a number…
Galaxy clustering measurements out to redshift z ∼ 8 from Hubble Legacy Fields
Trenti, Michele; Leethochawalit, Nicha; Dalmasso, Nicolò
We present a novel approach for measuring the two-point correlation function of galaxies in narrow pencil beam surveys with varying depths. Our methodology is utilized to expand high-redshift galaxy clustering investigations up to z ~ 8 by analysing a comprehensive sample consisting of Ng = 160 Lyman break galaxy candidates obtained thr…
The MASSIVE survey - XIX. Molecular gas measurements of the supermassive black hole masses in the elliptical galaxies NGC 1684 and NGC 0997
Ma, Chung-Pei; Greene, Jenny E.; Davis, Timothy A. +3 more
Supermassive black hole (SMBH) masses can be measured by observing their dynamical effects on tracers, such as molecular gas. We present high angular resolution Atacama Large Millimeter/submillimeter Array observations of the 12CO(2-1) line emission of the early-type galaxies (ETGs) NGC 1684 and NGC 0997, obtained as part of the MASSIVE…
Rotation plays a role in the generation of magnetic fields in single white dwarfs
Bell, Keaton J.; Parsons, Steven G.; Landstreet, John D. +5 more
Recent surveys of close white dwarf binaries as well as single white dwarfs have provided evidence for the late appearance of magnetic fields in white dwarfs, and a possible generation mechanism, a crystallization and rotation-driven dynamo has been suggested. A key prediction of this dynamo is that magnetic white dwarfs rotate, at least on averag…
The PIPER survey. II. The globular cluster systems of low surface brightness galaxies in the Perseus cluster
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +7 more
We present Hubble Space Telescope ACS/WFC and WFC3/UVIS imaging for a sample of 50 low-surface brightness (LSB) galaxies in the
Re-energization of AGN head-tail radio galaxies in the galaxy cluster ZwCl 0634.1+47474
Di Gennaro, G.; Brunetti, G.; Shimwell, T. W. +10 more
Low-frequency radio observations show an increasing number of radio galaxies located in galaxy clusters that display peculiar morphologies and spectral profiles. This is the result of the dynamical interaction of the galaxy with the surrounding medium. Studying this phenomenon is key to understanding the evolution of low-energy relativistic partic…
A cool, magnetic white dwarf accreting planetary debris
Vennes, Stéphane; Weinberger, Alycia J.; Zuckerman, B. +3 more
We present an analysis of spectroscopic data of the cool, highly magnetic, and polluted white dwarf 2MASS J0916-4215. The atmosphere of the white dwarf is dominated by hydrogen, but numerous spectral lines of magnesium, calcium, titanium, chromium, iron, and strontium, along with Li I, Na I, Al I, and K I lines, are found in the incomplete Paschen…
Unveiling the white dwarf in J191213.72 - 441045.1 through ultraviolet observations
Lyutikov, Maxim; Barkov, Maxim; Pelisoli, Ingrid +7 more
J191213.72 - 441045.1 is a binary system composed of a white dwarf and an M-dwarf in a 4.03-h orbit. It shows emission in radio, optical, and X-ray, all modulated at the white dwarf spin period of 5.3 min, as well as various orbital sideband frequencies. Like in the prototype of the class of radio-pulsing white dwarfs, AR Scorpii, the observed pul…