Search Publications
VST-GAME: Galaxy assembly as a function of mass and environment with VST. Photometric assessment and density field of MACSJ0416
Rodighiero, G.; Demarco, R.; Vulcani, B. +14 more
Context. Observational studies have widely demonstrated that galaxy physical properties are strongly affected by the surrounding environment. On one side, gas inflows provide galaxies with new fuel for star formation. On the other side, the high temperatures and densities of the medium are expected to induce quenching in the star formation. Observ…
Constraining the Systematics of (Acoustic) Wave Heating Estimates in the Solar Chromosphere
Kowalski, Adam F.; Cranmer, Steven R.; Reardon, Kevin P. +2 more
Acoustic wave heating is believed to contribute significantly to the missing energy input required to maintain the solar chromosphere in its observed state. We studied the propagation of waves above the acoustic cutoff in the upper photosphere into the chromosphere with ultraviolet and optical spectral observations interpreted through comparison w…
Inferred galaxy properties during Cosmic Dawn from early JWST photometry results
Wise, John H.; Brummel-Smith, Corey; Skinner, Danielle +3 more
Early photometric results from JWST have revealed a number of galaxy candidates above redshift 10. The initial estimates of inferred stellar masses and the associated cosmic star formation rates are above most theoretical model predictions up to a factor of 20 in the most extreme cases, while this has been moderated after the recalibration of NIRC…
SRG/eROSITA survey of Be stars
Nazé, Yaël; Robrade, Jan
Massive stars are known X-ray emitters and those belonging to the Be category are no exception. One type of X-ray emission even appears specific to that category, the γ Cas phenomenon. Its actual incidence has been particularly difficult to assess. Thanks to four semesters of sky survey data taken by the Spectrum-Roentgen-Gamma (SRG)/extended ROen…
Grantecan spectroscopic observations and confirmations of planetary nebulae candidates in the Northern Galactic Plane
Ritter, Andreas; Sabin, L.; Parker, Q. A. +3 more
We present Gran Telescopio Canarias (GTC) spectroscopic confirmations of 55 faint Planetary Nebulae (PNe) candidates discovered largely in the INT Photometric H α Survey (IPHAS) of the Northern Galactic Plane by our pro-am collaboration. We confirm 46 of them as 'True' (T), 4 as 'Likely' (L), and 5 as 'Possible' (P) PNe and including 5 new PNe cen…
Reeling in the Whirlpool galaxy: Distance to M 51 clarified through Cepheids and the type IIP supernova 2005cs
Leibundgut, B.; Anderson, R. I.; Blondin, S. +4 more
Context. The distance to the Whirlpool galaxy, M 51, is still debated, even though the galaxy has been studied in great detail. Current estimates range from 6.02 to 9.09 Mpc, and different methods yield discrepant results. No Cepheid distance has been published for M 51 to date.
Aims: We aim to estimate a more reliable distance to M 51 throug…
Surface chemical composition of single WNh stars
Martins, Fabrice
Context. Wolf-Rayet (WR) stars of the WNh category contain a significant fraction of hydrogen at their surface. They can be hydrogen-burning, very massive stars or stars in a post-main sequence phase of evolution. Also, WNh stars are sometimes not included in population synthesis models.
Aims: We aim to better characterise the properties of s…
The Disturbed and Globular-cluster-rich Ultradiffuse Galaxy UGC 9050-Dw1
Sand, David J.; Jones, Michael G.; Fielder, Catherine E. +5 more
We investigate the ultradiffuse galaxy (UDG) UGC 9050-Dw1, which was selected because of its disturbed morphology as part of a larger sample of UDGs that display evidence for significant interactions. We use the Hubble Space Telescope's Advanced Camera for Surveys to identify globular clusters (GCs) associated with UGC 9050-Dw1, and the Jansky Ver…
On the Relation Between Jupiter's Aurora and the Dawnside Current Sheet
Wei, Y.; Delamere, P. A.; Badman, S. V. +10 more
Jupiter's auroral emission is a spectacular phenomenon that provides insight into energy release processes related to the coupling of its magnetosphere and ionosphere. This energy release is influenced by solar wind conditions. Using joint observations from Juno and the Hubble Space Telescope (HST), we statistically investigate the relationship be…
Accurate mass-radius ratios for Hyades white dwarfs
Salaris, M.; Pasquini, L.; Pala, A. F. +4 more
We use the ESPRESSO spectrograph at the Very Large Telescope to measure velocity shifts and gravitational redshifts of eight bona fide Hyades white dwarfs, with an accuracy better than 1.5 per cent. By comparing the gravitational redshift measurements of the mass-to-radius ratio with the same ratios derived by fitting the Gaia photometry with theo…