Search Publications
An 8.56 keV Absorption Line in the Hyperluminous X-Ray Source in NGC 4045: Ultrafast Outflow or Cyclotron Line?
Fürst, Felix; Middleton, Matthew J.; Walton, Dominic J. +5 more
We report on the discovery of an absorption line at $E={8.56}_{-0.11}^{+0.05}$ keV detected with a significance of >3.3σ in the NuSTAR and XMM-Newton spectra of a newly discovered hyperluminous X-ray source (L X > 1041 erg s-1) in the galaxy NGC 4045 at a distance of 32 Mpc. The source was first discovered se…
The Solar Internetwork. III. Unipolar versus Bipolar Flux Appearance
Cheung, M. C. M.; Gošić, M.; Bellot Rubio, L. R. +3 more
Small-scale internetwork (IN) magnetic fields are considered to be the main building blocks of quiet Sun magnetism. For this reason, it is crucial to understand how they appear on the solar surface. Here, we employ a high-resolution, high-sensitivity, long-duration Hinode/NFI magnetogram sequence to analyze the appearance modes and spatiotemporal …
Probing infrared excess connection with Li enhancement among red clump giants
Reddy, Bacham E.; Muthumariappan, C.; Mallick, Anohita
We have performed a search among low-mass red giants for finding evidence for merger scenario for triggering He-flash and subsequent Li enhancement. We chose a sample of red giants from GALAH survey with well-measured Li abundances, and near- and mid-IR fluxes from 2MASS and WISE surveys, respectively. The sample contains 418 cool red clump giants…
The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel
Massardi, M.; Enia, A. F. M.; Negrello, M. +6 more
We investigate the radio/far-infrared (FIR) correlation for a sample of 28 bright high-redshift (1 ≲ z ≲ 4) star-forming galaxies selected in the FIR from the Herschel-ATLAS fields as candidates to be strongly gravitationally lensed. The radio information comes either from high sensitivity dedicated Australia Telescope Compact Array observations a…
Search for primordial black hole dark matter with x-ray spectroscopic and imaging satellite experiments and prospects for future satellite missions
Santangelo, Andrea; Malyshev, Denys; Moulin, Emmanuel
Ultralight primordial black holes (PBHs) in the mass range of 1016- 1022 g are allowed by current observations to constitute a significant fraction, if not all, of the dark matter in the Universe. In this work, we present limits on ultralight, nonrotating PBHs which arise from the nondetection of the Hawking radiation signals…
Bayesian Inference in Single-line Spectroscopic Binaries with a Visual Orbit
Mendez, Rene A.; Clavería, Rubén M.; Orchard, Marcos E. +2 more
We present a Bayesian inference methodology for the estimation of orbital parameters on single-line spectroscopic binaries with astrometric data, based on the No-U-Turn sampler Markov chain Monte Carlo algorithm. Our approach is designed to provide a precise and efficient estimation of the joint posterior distribution of the orbital parameters in …
Properties and applications of a predicted population of runaway He-sdO/B stars ejected from single degenerate He-donor SNe
Geier, S.; Justham, S.; Neunteufel, P. +4 more
Context. Thermonuclear supernovae (SNe), a subset of which are the highly important SNe of Type Ia and Iax, are relatively poorly understood phenomena. One of the more promising scenarios leading up to the creation of a thermonuclear SN involves accretion of helium-rich material from a binary companion. Following the SN, the binary companion is th…
Resolved Stellar Mass Maps of Galaxies in the Hubble Frontier Fields: Evidence for Mass Dependency in Environmental Quenching
Matharu, Jasleen; Muzzin, Adam; van der Wel, Arjen +9 more
One of the challenges in understanding the quenching processes for galaxies is connecting progenitor star-forming populations to their descendant quiescent populations over cosmic time. Here we attempt a novel approach to this challenge by assuming that the underlying stellar mass distribution of galaxies is not significantly altered during enviro…
Quasar and galaxy classification using Gaia EDR3 and CatWise2020
Bailer-Jones, Coryn A. L.; Hughes, Arvind C. N.; Jamal, Sara
In this work, we assess the combined use of Gaia photometry and astrometry with infrared data from CatWISE in improving the identification of extragalactic sources compared to the classification obtained using Gaia data. Here we perform a comprehensive study in which we assess different input feature configurations and prior functions to identify …
IM Normae: The Death Spiral of a Cataclysmic Variable?
Myers, Gordon; Monard, Berto; Dvorak, Shawn +18 more
We present a study of the orbital light curves of the recurrent nova IM Normae since its 2002 outburst. The broad "eclipses" recur with a 2.46 hr period, which increases on a timescale of 1.28(16) × 106 yr. Under the assumption of conservative mass transfer, this suggests a rate near 10-7 M ⊙ yr-1, and t…