Search Publications
DAHe white dwarfs from the DESI Survey
Brooks, D.; Honscheid, K.; Miquel, R. +16 more
A new class of white dwarfs, dubbed DAHe, that present Zeeman-split Balmer lines in emission has recently emerged. However, the physical origin of these emission lines remains unclear. We present here a sample of 21 newly identified DAHe systems and determine magnetic field strengths and (for a subset) periods that span the ranges of ≃6.5-147 MG a…
Hubble Constant Measurement from Three Large-separation Quasars Strongly Lensed by Galaxy Clusters
Mahler, Guillaume; Rigby, Jane R.; Bayliss, Matthew +5 more
Tension between cosmic microwave background-based and distance ladder-based determinations of the Hubble constant H 0 motivates the pursuit of independent methods that are not subject to the same systematic effects. A promising alternative, proposed by Refsdal in 1964, relies on the inverse scaling of H 0 with the delay betwe…
Dissecting the RELICS cluster SPT-CLJ0615-5746 through intracluster light: Confirmation of the multiple merging state of the cluster formation
Vílchez, J. M.; Lopes, P. A. A.; Dupke, R. A. +1 more
The intracluster light (ICL) fraction, measured at certain specific wavelengths, has been shown to provide a good marker for determining the dynamical stage of galaxy clusters, that is, merging versus relaxed, for low to intermediate redshifts. We apply it for the first time to a high-redshift system, SPT-CLJ0615-5746 at z = 0.97, using its Reioni…
Constraints on the Dust Size Distributions in the HD 163296 Disk from the Difference of the Apparent Dust Ring Widths between Two ALMA Bands
Kataoka, Akimasa; Doi, Kiyoaki
The dust size in protoplanetary disks is a crucial parameter for understanding planet formation, while the observational constraints on dust size distribution have large uncertainties. In this study, we present a new method to constrain the dust size distribution from the dust spatial distribution, utilizing the fact that larger dust grains are mo…
(523599) 2003 RM: The Asteroid that Wanted to be a Comet
Granvik, Mikael; Wainscoat, Richard J.; Weryk, Robert +11 more
We report a statistically significant detection of nongravitational acceleration on the subkilometer near-Earth asteroid (523599) 2003 RM. Due to its orbit, 2003 RM experiences favorable observing apparitions every 5 yr. Thus, since its discovery, 2003 RM has been extensively tracked with ground-based optical facilities in 2003, 2008, 2013, and 20…
The IACOB project. VIII. Searching for empirical signatures of binarity in fast-rotating O-type stars
Herrero, A.; Simón-Díaz, S.; Nazé, Y. +6 more
Context. The empirical distribution of projected rotational velocities (v sin i) in massive O-type stars is characterised by a dominant slow velocity component and a tail of fast rotators. It has been proposed that binary interaction plays a dominant role in the formation of this tail.
Aims: We perform a complete and homogeneous search for em…
The Unified Cluster Catalogue: towards a comprehensive and homogeneous data base of stellar clusters
Perren, Gabriel I.; Pera, María S.; Navone, Hugo D. +1 more
We introduce the Unified Cluster Catalogue, the largest catalogue of stellar clusters currently listing nearly 14 000 objects. In this initial release, it exclusively contains Milky Way open clusters, with plans to include other objects in future updates. Each cluster is processed using a novel probability membership algorithm, which incorporates …
Dependence of Cosmological Constraints on Gray Photometric Zero-point Uncertainties of Supernova Surveys
Riess, Adam G.; Stubbs, Christopher W.; Brout, Dillon +2 more
Type Ia supernova (SN) measurements of the Hubble constant, H 0; cosmic mass density, Ω M ; and dark energy equation-of-state parameter, w, rely on heterogeneous SN surveys across three decades of observation. These distinct surveys may have undiagnosed, relative photometric zero-point errors. We determine the sensitivities o…
Investigating the Narrow-line Region Dynamics in Nearby Active Galaxies
Fischer, Travis C.; Crenshaw, D. Michael; Schmitt, Henrique R. +7 more
We present dynamical models of the narrow-line region (NLR) outflows in the nearby Seyfert galaxies Mrk 3, Mrk 78, NGC 1068, and NGC 4151 using observations from the Hubble Space Telescope and Apache Point Observatory. We employ long-slit spectroscopy to map the spatially resolved outflow and rotational velocities of the ionized gas. We also perfo…
Multiphase Gas Interactions on Subarcsec Scales in the Shocked Intergalactic Medium of Stephan's Quintet with JWST and ALMA
Togi, Aditya; Duc, P. -A.; Appleton, P. N. +12 more
We combine James Webb Space Telescope (JWST) and Hubble Space Telescope imaging with Atacama Large Millimeter Array CO(2-1) spectroscopy to study the highly turbulent multiphase intergalactic medium (IGM) in Stephan's Quintet on 25-150 pc scales. Previous Spitzer observations revealed luminous H2 line cooling across a 45 kpc-long filame…