Search Publications
J-PLUS: a catalogue of globular cluster candidates around the M 81/M 82/NGC 3077 triplet of galaxies
Chies-Santos, Ana L.; Cenarro, A. Javier; Dupke, Renato +16 more
Globular clusters (GCs) are proxies of the formation assemblies of their host galaxies. However, few studies exist targeting GC systems of spiral galaxies up to several effective radii. Through 12-band Javalambre Photometric Local Universe Survey (J-PLUS) imaging, we study the point sources around the M 81/M 82/NGC 3077 triplet in search of new GC…
Herschel-ATLAS Data Release III: near-infrared counterparts in the South Galactic Pole field - another 100 000 submillimetre galaxies
Ivison, R. J.; Negrello, M.; Dunne, L. +6 more
In this paper, we present the third data release (DR3) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). We identify likely near-infrared counterparts to submillimetre sources in the South Galactic Pole (SGP) field using the VISTA VIKING survey. We search for the most probable counterparts within 15 arcsec of each Herschel sourc…
The Pristine Inner Galaxy Survey (PIGS) - IV. A photometric metallicity analysis of the Sagittarius dwarf spheroidal galaxy
Lewis, Geraint F.; Buder, Sven; Zucker, Daniel B. +15 more
We present a comprehensive metallicity analysis of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) using Pristine CaHK photometry. We base our member selection on Gaia EDR3 astrometry, applying a magnitude limit at G0 = 17.3, and our population study on the metallicity-sensitive photometry from the Pristine Inner Galaxy Survey (PIGS)…
The peculiar spectral evolution of the new X-ray transient MAXI J0637-430
Huang, Y.; Zhang, S.; Soria, R. +15 more
We studied the transient Galactic black hole candidate MAXI J0637-430 with data from Insight-HXMT, Swift, and XMM-Newton. The broad-band X-ray observations from Insight-HXMT help us constrain the power-law component. MAXI J0637-430 is located at unusually high Galactic latitude; if it belongs to the Galactic thick disc, we suggest a most likely di…
Is there a sub-parsec-scale jet base in the nearby dwarf galaxy NGC 4395?
Ho, Luis C.; Paragi, Zsolt; Nyland, Kristina +6 more
NGC 4395 is a dwarf galaxy at a distance of about 4.3 Mpc (scale: ~0.021 pc mas-1). It hosts an intermediate-mass black hole (IMBH) with a mass between ~104 and ~105 solar masses. The early radio observations of NGC 4395 with the very long baseline interferometry (VLBI) network, High Sensitivity Array (HSA), at 1.4…
Phobos and Deimos surface composition: search for spectroscopic analogues
Barucci, M. A.; Fornasier, S.; Matsuoka, M. +6 more
Phobos and Deimos, the two satellites of Mars, were largely studied in the past using ground-based telescope and spacecraft data, although most of the data were obtained by opportunity observations performed by Mars dedicated orbiters. Despite the data available so far, the main composition of the two moons is not yet fully understood. The possibl…
A GALAH view of the chemical homogeneity and ages of stellar strings identified in Gaia
Hawkins, Keith; Maas, Zachary G.; Manea, Catherine
The advent of Gaia has led to the discovery of nearly 300 elongated stellar associations (called 'strings') spanning hundreds of parsecs in length and mere tens of parsecs in width. These newfound populations present an excellent laboratory for studying the assembly process of the Milky Way thin disc. In this work, we use data from GALAH DR3 to in…
Accretion of a clumped wind from a red supergiant donor on to a magnetar is suggested by the analysis of the XMM-Newton and NuSTAR observations of the X-ray binary 3A 1954+319
Ducci, L.; Ferrigno, C.; Bozzo, E. +1 more
3A 1954+319 has been classified for a long time as a symbiotic X-ray binary, hosting a slowly rotating neutron star and an aged M red giant. Recently, this classification has been revised thanks to the discovery that the donor star is an M supergiant. This makes 3A 1954+319 a rare type of high-mass X-ray binary consisting of a neutron star and a r…
A 6D view of stellar shells
Evans, N. W.; Vasiliev, E.; Dong-Páez, C. A.
Stellar shells are low surface brightness features, created during nearly head-on galaxy mergers from the debris of the tidally disrupted satellite. Here, we investigate the formation and evolution mechanism of shells in six dimensions (3D positions and velocities). We propose a new description in action-angle coordinates which condenses the seemi…
Differences in star formation activity between tidally triggered and isolated bars: a case study of NGC 4303 and NGC 3627
Okamoto, Takashi; Pettitt, Alex R.; Iles, Elizabeth J.
Galactic bars are important drivers of galactic evolution, and yet how they impact the interstellar medium and correspondingly star formation, remains unclear. We present simulation results for two barred galaxies with different formation mechanisms, bars formed in isolation or via a tidal interaction, to consider the spatially and temporally vary…