Search Publications
Illuminating a tadpole's metamorphosis II: observing the ongoing transformation with ALMA
Reiter, Megan; Garay, Guido; McLeod, Anna F. +4 more
We present new Atacama Large Millimeter/submillimeter Array observations of the tadpole, a small globule in the Carina Nebula that hosts the HH 900 jet+outflow system. Our data include 12CO, 13CO, C18O J=2-1, 13CO, C18O J=3-2, and serendipitous detections of DCN J=3-2 and CS J=7-6. With angula…
Have we seen all the galaxies that comprise the cosmic infrared background at 250 µm ≤ λ ≤ 500 µm?
Ivison, R. J.; Clements, D. L.; Lagache, G. +11 more
The cosmic infrared background (CIB) provides a fundamental observational constraint on the star formation history of galaxies over cosmic history. We estimate the contribution to the CIB from catalogued galaxies in the COSMOS field by using a novel map fitting technique on the Herschel SPIRE maps. Prior galaxy positions are obtained using detecti…
The initial mass function in the extended ultraviolet disc of M83
Rich, R. Michael; Thilker, David A.; Bianchi, Luciana +7 more
Using Hubble Space Telescope ACS/WFC data we present the photometry and spatial distribution of resolved stellar populations of four fields within the extended ultraviolet disc (XUV disc) of M83. These observations show a clumpy distribution of main-sequence stars and a mostly smooth distribution of red giant branch stars. We constrain the upper e…
Physical properties of the fluorine and neutron-capture element-rich PN Jonckheere 900
Otsuka, Masaaki; Hyung, Siek
We performed detailed spectroscopic analyses of a young C-rich planetary nebula (PN) Jonckheere 900 (J900) in order to characterize the properties of the central star and nebula. Of the derived 17 elemental abundances, we present the first determination of eight elemental abundances. We present the first detection of the [F IV] 4059.9 Å, [F V] 13.…
Spectroscopic analysis of accretion/ejection signatures in the Herbig Ae/Be stars HD 261941 and V590 Mon
Lebreton, Y.; Alencar, S. H. P.; Alecian, E. +2 more
Herbig Ae/Be (HAeBe) stars are the intermediate-mass analogues of low-mass T Tauri stars. Both groups may present signs of accretion, outflow, and IR excess related to the presence of circumstellar discs. Magnetospheric accretion models are generally used to describe accreting T Tauri stars, which are known to have magnetic fields strong enough to…
Dark Energy Survey identification of a low-mass active galactic nucleus at redshift 0.823 from optical variability
De Vicente, Juan; García-Bellido, Juan; Gaztanaga, Enrique +57 more
We report the identification of a low-mass active galactic nucleus (AGN), DES J0218-0430, in a redshift z = 0.823 galaxy in the Dark Energy Survey (DES) Supernova field. We select DES J0218-0430 as an AGN candidate by characterizing its long-term optical variability alone based on DES optical broad-band light curves spanning over 6 yr. An archival…
The inner view of NGC 1052 using multiple X-ray observations
Papadakis, I. E.; Osorio-Clavijo, N.; González-Martín, O. +2 more
In this paper, we present a multi-epoch analysis of NGC 1052, a prototypical low-luminisity active galactic nucleus, using XMM-Newton, Suzaku and NuSTAR observations taken from 2001 to 2017. This is the first time that results from NuSTAR observations have been reported for NGC 1052. Regarding technical aspects, we found a wavelength-dependent cal…
Timing of the accreting millisecond pulsar IGR J17591-2342: evidence of spin-down during accretion
Sanna, A.; Ray, P. S.; Di Salvo, T. +8 more
We report on the phase-coherent timing analysis of the accreting millisecond X-ray pulsar IGR J17591-2342, using Neutron Star Interior Composition Explorer (NICER) data taken during the outburst of the source between 2018 August 15 and 2018 October 17. We obtain an updated orbital solution of the binary system. We investigate the evolution of the …
NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system
Jackman, James A. G.; Wheatley, Peter J.; Bayliss, Daniel +23 more
We present the discovery of NGTS J214358.5-380102, an eccentric M-dwarf binary discovered by the Next-Generation Transit Survey (NGTS). The system period of 7.618 d is greater than many known eclipsing M-dwarf binary systems. Its orbital eccentricity of $0.323^{+0.0014}_{-0.0037}$ is large relative to the period and semimajor axis of the binary. G…
Chasing candidate Supergiant Fast X-ray Transients in the 1000 orbits INTEGRAL/IBIS catalogue
Sidoli, L.; Bird, A. J.; Bazzano, A. +2 more
We report results from an investigation at hard X-rays (above 18 keV) and soft X-rays (below 10 keV) of a sample of X-ray transients located on the Galactic plane and detected with the bursticity method, as reported in the latest 1000 orbits INTEGRAL/IBIS catalogue. Our main aim has been to individuate those with X-rays characteristics strongly re…