Search Publications
V-band photometry of asteroids from ASAS-SN. Finding asteroids with slow spin
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +3 more
We present V-band photometry of the 20 000 brightest asteroids using data from the All-Sky Automated Survey for Supernovae (ASAS-SN) between 2012 and 2018. We were able to apply the convex inversion method to more than 5000 asteroids with more than 60 good measurements in order to derive their sidereal rotation periods, spin axis orientations, and…
The episodic and multiscale Galactic Centre
Krabbe, Alfred; Bryant, Aaron
Within the central few hundred parsecs of the Milky Way, extending from longitude l = -1° to 1.5°, lies the Central Molecular Zone of the Galactic Centre. This extraordinary region is defined by a diverse variety of ISM features in numerous stages of evolution. Molecular cloud H2 volume densities range from 103-8 cm-3
The baryon cycle of Seven Dwarfs with superbubble feedback
Madau, Piero; Mayer, Lucio; Mina, Mattia +3 more
We present results from a high-resolution, cosmological, ΛCDM simulation of a group of field dwarf galaxies with the "superbubble" model for clustered SN feedback, accounting for thermal conduction and cold gas evaporation. We compared our results to a previous simulation which has the same initial condition and galaxy formation physics (other tha…
Measuring the total infrared light from galaxy clusters at z = 0.5-1.6: connecting stellar populations to dusty star formation
Weiner, Benjamin J.; Dey, Arjun; Alberts, Stacey +13 more
Massive galaxy clusters undergo strong evolution from z ~ 1.6 to z ~ 0.5, with overdense environments at high-z characterized by abundant dust-obscured star formation and stellar mass growth which rapidly give way to widespread quenching. Data spanning the near- to far-infrared (IR) can directly trace this transformation; however, such studies hav…
Launching the asymmetric bipolar jet of DO Tau
Bacciotti, F.; Fedele, D.; Coffey, D. +5 more
Context. The role of bipolar jets in the formation of stars, and in particular how they are launched, is still not well understood.
Aims: We probe the protostellar jet launching mechanism using high-resolution observations of the near-infrared (IR) [Fe II]λ1.53,1.64 µm emission lines.
Methods: We consider the case of the bipolar je…
An X-Ray Spectral Study of the Origin of Reflection Features in Bare Seyfert 1 Galaxy ESO 511-G030
Laha, Sibasish; Ghosh, Ritesh
The reprocessed X-ray emission from active galactic nuclei is an important diagnostic tool to study the dynamics and geometry of the matter surrounding supermassive black holes (SMBHs). We present a broadband (optical-UV to hard X-ray) spectral study of the bare Seyfert 1 galaxy, ESO 511-G030, using multi-epoch Suzaku and XMM-Newton data from 2012…
The far reaches of the β Pictoris debris disk
Janson, Markus; Brandeker, Alexis; Olofsson, Göran +1 more
The nearby young star β Pictoris hosts a rich and complex planetary system, with at least two giant planets and a nearly edge-on debris disk that contains several dynamical subpopulations of planetesimals. While the inner ranges of the debris disk have been studied extensively, less information is known about the outer, fainter parts of the disk. …
A hyperluminous obscured quasar at a redshift of z ≈ 4.3
Burgarella, Denis; Oliver, Seb; Małek, Katarzyna +9 more
In this work we report the discovery of the hyperluminous galaxy HELP_J100156.75 + 022344.7 at a photometric redshift of $z$ ≈ 4.3. The galaxy was discovered in the Cosmological Evolution Survey (COSMOS) field, one of the fields studied by the Herschel Extragalactic Legacy Project (HELP). We present the spectral energy distribution (SED) of the ga…
The chemical composition of the accretion disc and donor star in ultra-compact X-ray binaries: A comprehensive X-ray analysis
Vasilopoulos, Georgios; Webb, Natalie; Koliopanos, Filippos +1 more
We have analysed the X-ray spectra of all known Ultra-Compact X-ray Binaries (UCXBs), with the purpose of constraining the chemical composition of their accretion disc and donor star. Our investigation was focused on the presence (or absence) of the Fe Kα emission line, which was used as the probe of chemical composition of the disc, based on prev…
High-resolution spectroscopy of the hot Am star HR 3383
Nielsen, K. E.; Leckrone, D. S.; Wahlgren, G. M.
We present the spectrum analysis of the hot Am star HR 3383 (A1 Vm). Hubble Space Telescope STIS and Nordic Optical Telescope SOFIN data are modelled with synthetic spectra, and abundances are investigated for 78 elements. Most light elements up through oxygen show deficiencies, compared to solar abundances, followed by the general trend of increa…