Search Publications
Distances to the Globular Clusters 47 Tucanae and NGC 362 Using Gaia DR2 Parallaxes
Caiazzo, Ilaria; Chen, Seery; Heyl, Jeremy +1 more
Using parallaxes from Gaia Data Release 2 (Gaia DR2), we estimate the distance to the globular clusters 47 Tuc and NGC 362, taking advantage of the background stars in the Small Magellanic Cloud and quasars to account for various parallax systematics. We found the parallax to be dependent on the Gaia DR2 G-band apparent magnitude for stars with 13…
Successive Flux Rope Eruptions from δ-sunspots Region of NOAA 12673 and Associated X-class Eruptive Flares on 2017 September 6
Joshi, Bhuwan; Veronig, Astrid M.; Mitra, Prabir K. +2 more
In this article, we present a multiwavelength analysis of two X-class solar eruptive flares of classes X2.2 and X9.3 that occurred in the sigmoidal active region NOAA 12673 on 2017 September 6, by combining observations of Atmospheric Imaging Assembly and Helioseismic Magnetic Imager instruments on board the Solar Dynamics Observatory. On the day …
The Carnegie-Chicago Hubble Program. III. The Distance to NGC 1365 via the Tip of the Red Giant Branch
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +8 more
The Carnegie-Chicago Hubble Program (CCHP) seeks to anchor the distance scale of Type Ia supernovae via the Tip of the Red Giant Branch (TRGB) method. Based on deep Hubble Space Telescope ACS/WFC imaging, we present an analysis of the TRGB for the metal-poor halo of NGC 1365, a giant spiral galaxy in the Fornax cluster that was host to the Type Ia…
StarGO: A New Method to Identify the Galactic Origins of Halo Stars
Kang, Xi; Chang, Jiang; Han, Jiaxin +3 more
We develop a new method, Stars’ Galactic Origin (StarGO), to identify the galactic origins of halo stars using their kinematics. Our method is based on a self-organizing map (SOM), which is one of the most popular unsupervised learning algorithms. STARGO combines SOM with a novel adaptive group identification algorithm with essentially no free par…
Galaxy and Quasar Fueling Caught in the Act from the Intragroup to the Interstellar Medium
Bouché, Nicolas; Marino, Raffaella A.; Maseda, Michael V. +11 more
We report the discovery of six spatially extended (10-100 kpc) line-emitting nebulae in the z ≈ 0.57 galaxy group hosting PKS 0405-123, one of the most luminous quasars at z < 1. The discovery is enabled by the Multi Unit Spectroscopic Explorer and provides tantalizing evidence connecting large-scale gas streams with nuclear activity on scales …
Correlation between the Total Gravitating Mass of Groups and Clusters and the Supermassive Black Hole Mass of Brightest Galaxies
Lovisari, Lorenzo; Volonteri, Marta; Bogdán, Ákos +1 more
Supermassive black holes (BHs) residing in the brightest cluster galaxies are over-massive relative to the stellar bulge mass or central stellar velocity dispersion of their host galaxies. As BHs residing at the bottom of the galaxy cluster’s potential well may undergo physical processes that are driven by the large-scale characteristics of the ga…
The MAVERIC Survey: A Red Straggler Binary with an Invisible Companion in the Galactic Globular Cluster M10
Strader, Jay; Bahramian, Arash; Maccarone, Thomas J. +9 more
We present the discovery and characterization of a radio-bright binary in the Galactic globular cluster M10. First identified in deep radio continuum data from the Karl G. Jansky Very Large Array, M10-VLA1 has a flux density of 27 ± 4 µJy at 7.4 GHz and a flat-to-inverted radio spectrum. Chandra imaging shows an X-ray source with L X <…
A Multiwavelength Look at Galactic Massive Star-forming Regions
Binder, Breanna A.; Povich, Matthew S.
We present a multiwavelength study of 28 Galactic massive star-forming H II regions. For 17 of these regions, we present new distance measurements based on Gaia DR2 parallaxes. By fitting a multicomponent dust, blackbody, and power-law continuum model to the 3.6 µm through 10 mm spectral energy distributions, we find that ∼34% of Lyman conti…
Morphology and Kinematics of Filaments in the Serpens and Perseus Molecular Clouds
Mundy, Lee G.; Storm, Shaye; Dhabal, Arnab +2 more
We present H13CO+ (J = 1-0) and HNC (J = 1-0) maps of regions in Serpens South, Serpens Main, and NGC 1333 containing filaments. We also observe the Serpens regions using H13CN (J = 1-0). These dense gas tracer molecular line observations carried out with CARMA have an angular resolution of ∼7″, a spectral resoluti…
Spectroscopic Investigation of a Reionized Galaxy Overdensity at z = 7
Maiolino, R.; Dickinson, M.; Giavalisco, M. +17 more
We present deep spectroscopic follow-up observations of the Bremer Deep Field (BDF), where the two z ∼ 7 bright Lyα emitters (LAE) BDF521 and BDF3299 were previously discovered by Vanzella et al. and where a factor of ∼3-4 overdensity of faint LBGs has been found by Castellano et al. We confirm a new bright Lyα emitter, BDF2195, at the same redshi…