Search Publications
Missions
Journals
Publication Years
The first all-sky view of the Milky Way stellar halo with Gaia+2MASS RR Lyrae
Belokurov, V.; Koposov, S. E.; Iorio, G. +3 more
We exploit the first Gaia data release to study the properties of the Galactic stellar halo as traced by RR Lyrae. We demonstrate that it is possible to select a pure sample of RR Lyrae using only photometric information available in the Gaia+2MASS catalogue. The final sample contains about 21 600 RR Lyrae covering an unprecedented fraction ( ∼ 60…
Enrichment of the Hot Intracluster Medium: Observations
Yamaguchi, H.; Simionescu, A.; Kaastra, J. S. +7 more
Four decades ago, the firm detection of an Fe-K emission feature in the X-ray spectrum of the Perseus cluster revealed the presence of iron in its hot intracluster medium (ICM). With more advanced missions successfully launched over the last 20 years, this discovery has been extended to many other metals and to the hot atmospheres of many other ga…
A New Look at an Old Cluster: The Membership, Rotation, and Magnetic Activity of Low-mass Stars in the 1.3 Gyr Old Open Cluster NGC 752
Kraus, A.; Bochanski, J. J.; Covey, K. R. +8 more
The nearby open cluster NGC 752 presents a rare opportunity to study stellar properties at ages >1 Gyr. However, constructing a membership catalog for it is challenging; most surveys have been limited to identifying its giants and dwarf members earlier than mid-K. We supplement past membership catalogs with candidates selected with updated phot…
Hidden in Plain Sight: A Massive, Dusty Starburst in a Galaxy Protocluster at z = 5.7 in the COSMOS Field
Schinnerer, Eva; Scoville, Nick; Carilli, Christopher L. +7 more
We report the serendipitous discovery of a dusty, starbursting galaxy at z = 5.667 (hereafter called CRLE) in close physical association with the “normal” main-sequence galaxy HZ10 at z = 5.654. CRLE was identified by detection of [C II], [N II], and CO(2-1) line emission, making it the highest-redshift, most luminous starburst in the COSMOS field…
Absolute Hubble Space Telescope Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass
van der Marel, Roeland P.; Watkins, Laura L.; Bellini, Andrea +4 more
We present Hubble Space Telescope (HST) absolute proper motion (PM) measurements for 20 globular clusters (GCs) in the Milky Way (MW) halo at Galactocentric distances {R}GC}≈ 10{--}100 kpc, with a median per-coordinate PM uncertainty of 0.06 {mas} {yr}}-1. Young and old halo GCs do not show systematic differences in their 3D …
Solar total and spectral irradiance reconstruction over the last 9000 years
Solanki, S. K.; Wu, C. -J.; Krivova, N. A. +1 more
Context. Changes in solar irradiance and in its spectral distribution are among the main natural drivers of the climate on Earth. However, irradiance measurements are only available for less than four decades, while assessment of solar influence on Earth requires much longer records.
Aims: The aim of this work is to provide the most up-to-dat…
Imprints of cosmic rays in multifrequency observations of the interstellar emission
Orlando, E.
Ever since the discovery of cosmic rays (CRs), significant advancements have been made in modelling their propagation in the Galaxy and in the Heliosphere. However, propagation models suffer from degeneracy of many parameters. To complicate the picture, the precision of recent data have started challenging existing models. To tackle these issues, …
HFF-DeepSpace Photometric Catalogs of the 12 Hubble Frontier Fields, Clusters, and Parallels: Photometry, Photometric Redshifts, and Stellar Masses
Muzzin, Adam; Labbé, Ivo; van der Wel, Arjen +14 more
We present Hubble multi-wavelength photometric catalogs, including (up to) 17 filters with the Advanced Camera for Surveys and Wide Field Camera 3 from the ultra-violet to near-infrared for the Hubble Frontier Fields and associated parallels. We have constructed homogeneous photometric catalogs for all six clusters and their parallels. To further …
Kinematics of Highly r-process-enhanced Field Stars: Evidence for an Accretion Origin and Detection of Several Groups from Disrupted Satellites
Hattori, Kohei; Roederer, Ian U.; Valluri, Monica
We present the kinematics of 35 highly r-process-enhanced ([Eu/Fe] ≥ +0.7) metal-poor (-3.8 < [Fe/H] < -1.4) field stars. We calculate six-dimensional positions and velocities, evaluate energies and integrals of motion, and compute orbits for each of these stars using parallaxes and proper motions from the second Gaia data release and publis…
A clumpy and anisotropic galaxy halo at redshift 1 from gravitational-arc tomography
Tejos, Nicolas; Rigby, Jane R.; Barrientos, L. Felipe +6 more
Every star-forming galaxy has a halo of metal-enriched gas that extends out to at least 100 kiloparsecs, as revealed by the absorption lines that this gas imprints on the spectra of background quasars. However, quasars are sparse and typically probe only one narrow beam of emission through the intervening galaxy. Close quasar pairs and gravitation…