Search Publications
PHANGS-JWST First Results: Measuring Polycyclic Aromatic Hydrocarbon Properties across the Multiphase Interstellar Medium
Kruijssen, J. M. Diederik; Leroy, Adam K.; Rosolowsky, Erik +26 more
Ratios of polycyclic aromatic hydrocarbon (PAH) vibrational bands are a promising tool for measuring the properties of the PAH population and their effect on star formation. The photometric bands of the MIRI and NIRCam instruments on JWST provide the opportunity to measure PAH emission features across entire galaxy disks at unprecedented resolutio…
The MSPSRπ catalogue: VLBA astrometry of 18 millisecond pulsars
Lazio, T. J. W.; Guillemot, L.; Chatterjee, S. +13 more
With unparalleled rotational stability, millisecond pulsars (MSPs) serve as ideal laboratories for numerous astrophysical studies, many of which require precise knowledge of the distance and/or velocity of the MSP. Here, we present the astrometric results for 18 MSPs of the 'MSPSR$\pi$' project focusing exclusively on astrometry of MSPs, which inc…
Beyond the two-infall model. I. Indications for a recent gas infall with Gaia DR3 chemical abundances
Schultheis, M.; Recio-Blanco, A.; de Laverny, P. +7 more
Context. The recent Gaia Data Release 3 (DR3) represents an unparalleled revolution in Galactic archaeology, providing numerous radial velocities and chemical abundances for millions of stars as well as all-sky coverage. Aims We present a new chemical evolution model for the Galactic disc components (high- and low- α sequence stars) designed to re…
TESS-Gaia Light Curve: A PSF-based TESS FFI Light-curve Product
Brandt, Timothy D.; Han, Te
The Transiting Exoplanet Survey Satellite (TESS) is continuing its second extended mission after 55 sectors of observations. TESS publishes full-frame images (FFIs) at a cadence of 1800, 600, or 200 s, allowing light curves to be extracted for stars beyond a limited number of pre-selected stars. Simulations show that thousands of exoplanets, eclip…
Sub-per-cent determination of the brightness at the tip of the red giant branch in the Magellanic Clouds
Hoyt, Taylor J.
The value of the Hubble constant as constrained by type Ia supernovae is directly tied to the zero point of the extragalactic distance scale, which is in turn set by the calibration of astrophysical distance indicators such as the tip of the red giant branch (TRGB). In this article, a calibration of the TRGB luminosity is determined in the Magella…
Photometric Metallicity and Distance Estimates for 136,000 RR Lyrae Stars from Gaia Data Release 3
Huang, Yang; Liu, Gao-Chao; Beers, Timothy C. +2 more
We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric metallicity and distance estimates from our newly calibrated P-ϕ 31-R 21-[Fe/H]/P-R 21-[Fe/H] and G-band absolute magnitude-metallicity relations. The P-ϕ 31-R 21-[Fe/H] and P-R 21-[Fe/H] relations for typ…
The distribution of globular clusters in kinematic spaces does not trace the accretion history of the host galaxy
Haywood, M.; Mastrobuono-Battisti, A.; Combes, F. +4 more
Context. Reconstructing how all the stellar components of the Galaxy formed and assembled over time by studying the properties of the stars that form it is the aim of Galactic archaeology. Thanks to the launch of the ESA Gaia astrometric mission and the development of many spectroscopic surveys in recent years, we are for the first time in the pos…
Little Red Dots or Brown Dwarfs? NIRSpec Discovery of Three Distant Brown Dwarfs Masquerading as NIRCam-selected Highly Reddened Active Galactic Nuclei
Langeroodi, Danial; Hjorth, Jens
Cold, substellar objects such as brown dwarfs have long been recognized as contaminants in color-selected samples of active galactic nuclei (AGNs). In particular, their near- to mid-infrared colors (1-5 µm) can closely resemble the V-shaped (f λ ) spectra of highly reddened accreting supermassive black holes ("little red dots"), …
On the Cosmic Evolution of AGN Obscuration and the X-Ray Luminosity Function: XMM-Newton and Chandra Spectral Analysis of the 31.3 deg2 Stripe 82X
Kirkpatrick, Allison; Marchesi, Stefano; LaMassa, Stephanie +11 more
We present X-ray spectral analysis of XMM-Newton and Chandra observations in the 31.3 deg2 Stripe-82X (S82X) field. Of the 6181 unique X-ray sources in this field, we analyze a sample of 2937 candidate active galactic nuclei (AGNs) with solid redshifts and sufficient counts determined by simulations. Our results show an observed populat…
Spherical symmetry in the kilonova AT2017gfo/GW170817
Kotak, Rubina; Watson, Darach; Sim, Stuart +5 more
The mergers of neutron stars expel a heavy-element enriched fireball that can be observed as a kilonova1-4. The kilonova's geometry is a key diagnostic of the merger and is dictated by the properties of ultra-dense matter and the energetics of the collapse to a black hole. Current hydrodynamical merger models typically show aspherical e…