Search Publications
The H α luminosity and stellar mass dependent clustering of star-forming galaxies at 0.7 < z < 1.5 with 3D-HST
Wake, David; Zheng, Zheng; Clontz, Callie
We present measurements of the dependence of the clustering amplitude of galaxies on their star formation rate (SFR) and stellar mass (M*) at 0.7 < z < 1.5 to assess the extent to which environment affects these properties. While these relations are well determined in the local Universe, they are much more poorly known at earlier …
On survival of dust grains in the sublimation zone of cold white dwarfs
Shestakova, Lyubov I.; Kenzhebekova, Akmaral I.; Serebryanskiy, Aleksander V.
We consider a mechanism for the deposition of dust grains on to the surface of cold white dwarfs (WDs). Calculations show that grains can fall on to a cold WD directly, without reaching the phase of complete evaporation, if the parent bodies and the grains orbit on elongated, close to parabolic, orbits. To this end, we calculated the dynamics of e…
SN 2019va: a Type IIP Supernova with Large Influence of Nickel-56 Decay on the Plateau-phase Light Curve
Wang, Xiaofeng; Zhang, Jujia; Mo, Jun +12 more
We present multiband photometric and spectroscopic observations of the type II supernova, (SN) 2019va, which shows an unusually flat plateau-phase evolution in its V-band light curve. Its pseudo-bolometric light curve even shows a weak brightening towards the end of the plateau phase. These uncommon features are related to the influence of 56…
Automated algorithms to build active galactic nucleus classifiers
Larsson, J.; Falocco, S.; Carrera, F. J.
We present a machine learning model to classify active galactic nuclei (AGNs) and galaxies (AGN-galaxy classifier) and a model to identify type 1 (optically unabsorbed) and type 2 (optically absorbed) AGN (type 1/2 classifier). We test tree-based algorithms, using training samples built from the X-ray Multi-Mirror Mission-Newton (XMM-Newton) catal…
SDSS-IV MaStar: [α/Fe] for the MaNGA Stellar Library from synthetic model spectra
Bizyaev, Dmitry; Law, David R.; Stassun, Keivan G. +11 more
We calculate the α-enhancement ratio [α/Fe] for the Mapping Nearby Galaxies at APO (MaNGA) Stellar Library (MaStar) while also fitting for the fundamental atmospheric parameters effective temperature, surface gravity, and metallicity - Teff, log g, [Fe/H]. This approach builds upon a previous catalogue of stellar parameters, whereby onl…
Active longitudes and starspot evolution of the young rapidly rotating star USNO-B1.0 1388-0463685 discovered in the Yunnan-Hong Kong survey
Bai, Jinming; Wang, Xiaobin; Xiang, Yue +12 more
We have discovered a young, rapidly rotating active star USNO-B1.0 1388-0463685 with a rotational period of 0.508750 ± 0.000153 d in the Yunnan-Hong Kong wide-field photometric survey. Based on the chromospheric activity identified in the dedicated spectroscopic observations, the brightness variation of this star is attributed to cool spots on its…
CHANG-ES - XXVII. A radio/X-ray catalogue of compact sources in and around edge-on galaxies
Wang, Q. Daniel; Irwin, Judith; Wiegert, Theresa +5 more
We present catalogues of discrete, compact radio sources in and around the discs of 35 edge-on galaxies in the Continuum Halos in Nearby Galaxies - an EVLA Survey. The sources were extracted using the PYBDSF program at both 1.6 GHz (L band) and 6.0 GHz (C band) from matching resolution (≈3 arcsec) data. We also present catalogues of X-ray sources …
Close substellar-mass companions in stellar wide binaries: discovery and characterization with APOGEE and Gaia DR2
Bizyaev, Dmitry; Pan, Kaike; Majewski, Steven R. +12 more
We present a search for close, unresolved companions in a subset of spatially resolved Gaia wide binaries containing main-sequence stars within 200 pc of the Sun, utilizing the APOGEE-Gaia Wide Binary Catalog. A catalogue of 37 wide binaries was created by selecting pairs of stars with nearly identical Gaia positions, parallaxes, and proper motion…
The unusually high dark matter concentration of the galaxy group NGC 1600
Walker, S. A.; Mirakhor, M. S.; Runge, J.
We investigate the properties of the dark matter (DM) halo surrounding the nearby galaxy group NGC 1600. Through the use of deep (252 ks) Chandra observations and 64.3 ks of XMM-Newton observations, we construct surface brightness profiles in multiple energy bands in order to perform hydrostatic equilibrium analysis of the hot plasma within NGC 16…
Unveiling the main sequence to starburst transition region with a sample of intermediate redshift luminous infrared galaxies
Magdis, G. E.; Rigopoulou, D.; Combes, F. +8 more
We present a CO(3-2) study of four systems composed of six (ultra) luminous infrared galaxies (U/LIRGs), located at 0.28 <z < 0.44, that straddle the transition region between regular star-forming galaxies and starbursts. These galaxies benefit from previous multiwavelength analysis allowing in depth exploration of an understudied population…