Search Publications
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…
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…
An emerging and enigmatic spectral class of isolated DAe white dwarfs
Hermes, J. J.; Munday, James; Gänsicke, Boris T. +9 more
Two recently discovered white dwarfs, WD J041246.84 + 754942.26 and WD J165335.21 - 100116.33, exhibit Hα and Hβ Balmer line emission similar to stars in the emerging DAHe class, yet intriguingly have not been found to have detectable magnetic fields. These white dwarfs are assigned the spectral type DAe. We present detailed follow-up of the two k…
Alignment of dense molecular core morphology and velocity gradients with ambient magnetic fields
Di Francesco, J.; Caselli, P.; Pineda, J. E. +15 more
Studies of dense core morphologies and their orientations with respect to gas flows and the local magnetic field have been limited to only a small sample of cores with spectroscopic data. Leveraging the Green Bank Ammonia Survey alongside existing sub-millimeter continuum observations and Planck dust polarization, we produce a cross-matched catalo…
The discovery of three hot Jupiters, NGTS-23b, 24b, and 25b, and updated parameters for HATS-54b from the Next Generation Transit Survey
de Mooij, Ernst J. W.; Jackman, James A. G.; Wheatley, Peter J. +35 more
We report the discovery of three new hot Jupiters with the Next Generation Transit Survey (NGTS) as well as updated parameters for HATS-54b, which was independently discovered by NGTS. NGTS-23b, NGTS-24b, and NGTS-25b have orbital periods of 4.076, 3.468, and 2.823 d and orbit G-, F-, and K-type stars, respectively. NGTS-24 and HATS-54 appear clos…
Radio detections of two unusual cataclysmic variables in the VLA Sky Survey
Heinke, C. O.; Sivakoff, G. R.; Hughes, A. K. +1 more
We report two new radio detections of cataclysmic variables (CVs), and place them in context with radio and X-ray detections of other CVs. We detected QS Vir, a low accretion-rate CV; V2400 Oph, a discless intermediate polar; and recovered the polar AM Her in the Very Large Array Sky Survey 2-4 GHz radio images. The radio luminosities of these sys…
Different higher order kinematics between star-forming and quiescent galaxies based on the SAMI, MAGPI, and LEGA-C surveys
Bell, Eric F.; Übler, Hannah; D'Eugenio, Francesco +38 more
We present the first statistical study of spatially integrated non-Gaussian stellar kinematics spanning 7 Gyr in cosmic time. We use deep, rest-frame optical spectroscopy of massive galaxies (stellar mass $M_\star \gt 10^{10.5} \, \mathrm{M_\odot }$) at redshifts z = 0.05, 0.3, and 0.8 from the SAMI, MAGPI, and LEGA-C surveys, to measure the exces…
Star formation efficiency and AGN feedback in narrow-line Seyfert 1 galaxies with fast X-ray nuclear winds
Feruglio, C.; García-Burillo, S.; Krongold, Y. +7 more
We present the first systematic study of the molecular gas and star formation efficiency in a sample of ten narrow-line Seyfert 1 galaxies selected to have X-ray Ultra Fast Outflows and, therefore, to potentially show AGN feedback effects. CO observations were obtained with the IRAM 30-m telescope in six galaxies and from the literature for four g…
Much ado about no offset - characterizing the anomalous multiple-image configuration and the model-driven displacement between light and mass in the multiplane strong lens Abell 3827
Griffiths, Richard E.; Wagner, Jenny; Lin, Joyce
Abell 3827 is a unique galaxy cluster with a dry merger in its core causing a highly resolved multiple-image configuration of a blue spiral galaxy at zs = 1.24. The surface brightness profiles of four merging galaxies around zd = 0.099 complicate a clear identification of the number of images and finding corresponding small-s…