Search Publications
The massive relic galaxy NGC 1277 is dark matter deficient. From dynamical models of integral-field stellar kinematics out to five effective radii
Trujillo, Ignacio; Cappellari, Michele; Buitrago, Fernando +7 more
According to the Λ cold dark matter (ΛCDM) cosmology, present-day galaxies with stellar masses M⋆ > 1011 M⊙ should contain a sizable fraction of dark matter within their stellar body. Models indicate that in massive early-type galaxies (ETGs) with M⋆ ≈ 1.5 × 1011 M⊙, dark matter …
Gaia Data Release 3. Reflectance spectra of Solar System small bodies
Prusti, T.; Mazeh, T.; Zucker, S. +444 more
Context. The Gaia mission of the European Space Agency (ESA) has been routinely observing Solar System objects (SSOs) since the beginning of its operations in August 2014. The Gaia data release three (DR3) includes, for the first time, the mean reflectance spectra of a selected sample of 60 518 SSOs, primarily asteroids, observed between August 5,…
Supermassive Black Hole Winds in X-rays: SUBWAYS. I. Ultra-fast outflows in quasars beyond the local Universe
Maiolino, R.; Merloni, A.; Fiore, F. +49 more
We present a new X-ray spectroscopic study of 22 luminous (2 × 1045 ≲ Lbol/erg s−1 ≲ 2 × 1046) active galactic nuclei (AGNs) at intermediate redshifts (0.1 ≲ z ≲ 0.4), as part of the SUpermassive Black hole Winds in the x-rAYS (SUBWAYS) sample, mostly composed of quasars and type 1 AGNs. Here, 17 targets…
JWST Insight into a Lensed HST-dark Galaxy and Its Quiescent Companion at z = 2.58
Fujimoto, Seiji; Kohno, Kotaro; Trebitsch, Maxime +13 more
Using the novel James Webb Space Telescope (JWST)/NIRCam observations in the A2744 field, we present a first spatially resolved overview of a Hubble Space Telescope (HST)-dark galaxy, spectroscopically confirmed at z = 2.58 with magnification µ ≈ 1.9. While being largely invisible at ~1 µm with NIRCam, except for sparse clumpy substruc…
The stellar mass of the Gaia-Sausage/Enceladus accretion remnant
Bovy, Jo; Lane, James M. M.; Mackereth, J. Ted
The Gaia-Sausage/Enceladus (GS/E) structure is an accretion remnant that comprises a large fraction of the Milky Way's stellar halo. We study GS/E using high-purity samples of kinematically selected stars from APOGEE DR16 and Gaia. Employing a novel framework to account for kinematic selection biases using distribution functions, we fit density pr…
A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
Fruchter, Andrew S.; Heintz, Kasper E.; Jonker, Peter G. +29 more
The majority of long-duration (>2 s) gamma-ray bursts (GRBs) arise from the collapse of massive stars, with a small proportion created from the merger of compact objects. Most of these systems form via standard stellar evolution pathways. However, a fraction of GRBs may result from dynamical interactions in dense environments. These channels co…
Polarization Properties of the Weakly Magnetized Neutron Star X-Ray Binary GS 1826-238 in the High Soft State
Wu, Kinwah; Enoto, Teruaki; Turolla, Roberto +94 more
The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on 2021 December 9 has opened a new window in X-ray astronomy. We report here the results of the first IXPE observation of a weakly magnetized neutron star, GS 1826-238, performed on 2022 March 29-31 when the source was in a high soft state. An upper limit (99.73% confidence level) of 1.3…
Assessing the C/O Ratio Formation Diagnostic: A Potential Trend with Companion Mass
Macintosh, Bruce; Perrin, Marshall D.; Barman, Travis S. +6 more
The carbon-to-oxygen (C/O) ratio in an exoplanet atmosphere has been suggested as a potential diagnostic of planet formation. Now that a number of exoplanets have measured C/O ratios, it is possible to examine this diagnostic at a population level. Here, we present an analysis of currently measured C/O ratios of directly imaged and transit/eclipse…
Constraining resonant dark matter self-interactions with strong gravitational lenses
Bovy, Jo; Gilman, Daniel; Zhong, Yi-Ming
We devise a method to constrain self-interacting dark matter (SIDM) from observations of quadruply imaged quasars, and apply it to five self-interaction potentials with a long-range dark force. We consider several SIDM models with an attractive potential that allows for the formation of quasibound states, giving rise to resonant features in the cr…
Beyond UVJ: Color Selection of Galaxies in the JWST Era
Papovich, Casey; Martis, Nicholas S.; Muzzin, Adam +8 more
We present a new rest-frame color-color selection method using synthetic u s - g s and g s - i s , (ugi) s colors to identify star-forming and quiescent galaxies. Our method is similar to the widely used U - V versus V - J (UVJ) diagram. However, UVJ suffers known systematics. Spectros…