Search Publications
Two separate outflows in the dual supermassive black hole system NGC 6240
Treister, E.; Privon, G. C.; Davies, R. I. +3 more
Theoretical models and numerical simulations have established a framework of galaxy evolution in which galaxies merge and create dual supermassive black holes (with separations of one to ten kiloparsecs), which eventually sink into the centre of the merger remnant, emit gravitational waves and coalesce. The merger also triggers star formation and …
The Massive Star-forming Regions Omnibus X-ray Catalog, Second Installment
Naylor, Tim; Garmire, Gordon P.; Feigelson, Eric D. +4 more
We present the second installment of the Massive Star-forming Regions (MSFRs) Omnibus X-ray Catalog (MOXC2), a compilation of X-ray point sources detected in Chandra/ACIS observations of 16 Galactic MSFRs and surrounding fields. MOXC2 includes 13 ACIS mosaics, three containing a pair of unrelated MSFRs at different distances, with a total catalog …
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XIV. Multiple stellar populations within M 15 and their radial distribution
Anderson, J.; Milone, A. P.; Marino, A. F. +6 more
In the context of the Hubble Space Telescope UV Survey of Galactic globular clusters (GCs), we derived high-precision, multi-band photometry to investigate the multiple stellar populations in the massive and metal-poor GC M 15. By creating for red-giant branch (RGB) stars of the cluster a `chromosome map', which is a pseudo two-colour diagram made…
Five New Globular Clusters Discovered in the Galactic Bulge
Camargo, Denilso
This Letter reports the discovery of five new globular clusters (GCs) in the Galactic bulge (Camargo 1102, 1103, 1104, 1105, and 1106) using Wide-field Infrared Survey Explorer (WISE) images. Their natures are established by using 2MASS and Gaia second data release (DR2) photometry. The new findings are old and metal-poor GCs located less than 4 k…
A new compact young moving group around V1062 Scorpii
Henning, Thomas; Goldman, Bertrand; Röser, Siegfried +3 more
Aims: We are searching for new open clusters or moving groups in the solar neighbourhood.
Methods: We used the Gaia-TGAS catalogue, cut it into narrow proper motion and parallax slices and searched for significant spatial over-densities of stars in each slice. We then examined stars forming over-densities in optical and near-infrared col…
Chemical Inhomogeneities in the Pleiades: Signatures of Rocky-forming Material in Stellar Atmospheres
Casey, Andrew R.; Meléndez, Jorge; Spina, Lorenzo +2 more
The aim of Galactic archaeology is to recover the history of our Galaxy through the information encoded in stars. An unprobed assumption of this field is that the chemical composition of a star is an immutable marker of the gas from which it formed. It is vital to test this assumption on open clusters, a group of stars formed from the same gas. Pr…
Astrometric and photometric study of Dias 4, Dias 6, and other five open clusters using ground-based and Gaia DR2 data
Dias, W. S.; Monteiro, H.; Lépine, J. R. D. +3 more
We present a study of seven southern open clusters based on UBVRI CCD photometry (Johnsons-Cousins system) and Gaia DR2 data. Dias 4, Dias 6, and four other clusters had UBVRI photometric observations determined for the first time. From the observational UBVRI data we obtained photometric membership probability estimates and, using the proper moti…
Starspot Occultations in Infrared Transit Spectroscopy: The Case of WASP-52b
Deming, Drake; Stevenson, Kevin B.; López-Morales, Mercedes +7 more
Stellar activity is one of the main obstacles to high-precision exoplanet observations and has motivated extensive studies in detection and characterization problems. Most efforts focused on unocculted starspots in optical transit spectrophotometry, while the impact of starspot crossings is assumed to be negligible in the near-infrared. Here, we p…
The quasi-linear nearby Universe
Tully, R. Brent; Courtois, Hélène M.; Pomarède, Daniel +6 more
The local Universe provides a unique opportunity for testing cosmology and theories of structure formation. As the velocities of galaxies respond to the distribution of matter—both visible and dark—the velocity field provides structural information. Here, we present an original method for the reconstruction of the quasi-linear matter density and v…
The Distance to and the Near-infrared Extinction of the Monoceros Supernova Remnant
Jiang, Biwei; Zhao, He; Li, Jun +2 more
Supernova remnants (SNRs) contain information on the influence of supernova explosions on dust properties. Based on the color indices from the Two Micron All Sky Survey and the stellar parameters from the SDSS-DR12/Apache Point Observatory Galactic Evolution Experiment and LAMOST-DR2/LAMOST Experiment for Galactic Understanding and Exploration spe…