Search Publications
Absolute Calibration of the Radio Astronomy Flux Density Scale at 22 to 43 GHz Using Planck
López-Caniego, M.; Partridge, B.; Rocha, G. +5 more
The Planck mission detected thousands of extragalactic radio sources at frequencies from 28 to 857 GHz. Planck's calibration is absolute (in the sense that it is based on the satellite’s annual motion around the Sun and the temperature of the cosmic microwave background), and its beams are well characterized at sub-percent levels. Thus, Planck's f…
The rotation-metallicity relation for the Galactic disk as measured in the Gaia DR1 TGAS and APOGEE data
Cropper, Mark; Kawata, Daisuke; Allende Prieto, Carlos
Aims: Previous studies have found that the Galactic rotation velocity-metallicity (V-[Fe/H]) relations for the thin and thick disk populations show negative and positive slopes, respectively. The first Gaia data release includes the Tycho-Gaia Astrometric Solution (TGAS) information, which we use to analyze the V-[Fe/H] relation for a strictl…
SHIELD: Neutral Gas Kinematics and Dynamics
McQuinn, Kristen B. W.; Cannon, John M.; Skillman, Evan D. +22 more
We present kinematic analyses of the 12 galaxies in the “Survey of H I in Extremely Low-mass Dwarfs” (SHIELD). We use multi-configuration interferometric observations of the H I 21 cm emission line from the Karl G. Jansky Very Large Array (VLA)22 to produce image cubes at a variety of spatial and spectral resolutions. Both two- and thre…
Two Distinct-absorption X-Ray Components from Type IIn Supernovae: Evidence for Asphericity in the Circumstellar Medium
Sugawara, Yasuharu; Katsuda, Satoru; Kawabata, Koji +7 more
We present multi-epoch X-ray spectral observations of three Type IIn supernovae (SNe), SN 2005kd, SN 2006jd, and SN 2010jl, acquired with Chandra, XMM-Newton, Suzaku, and Swift. Previous extensive X-ray studies of SN 2010jl have revealed that X-ray spectra are dominated by thermal emission, which likely arises from a hot plasma heated by a forward…
HERschel Observations of Edge-on Spirals (HEROES). III. Dust energy balance study of IC 2531
Mosenkov, Aleksandr V.; De Looze, Ilse; Baes, Maarten +11 more
We investigate the dust energy balance for the edge-on galaxy IC 2531, one of the seven galaxies in the HEROES sample. We perform a state-of-the-art radiative transfer modelling based, for the first time, on a set of optical and near-infrared galaxy images. We show that by taking into account near-infrared imaging in the modelling significantly im…
Galaxy populations in the 26 most massive galaxy clusters in the South Pole Telescope SPT-SZ survey
Rest, A.; Zenteno, A.; Desai, S. +13 more
We present a study of the optical properties of the 26 most massive galaxy clusters within the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) 2500 deg2 survey spanning the redshift range 0.10 < z < 1.13. We measure the radial profiles, the luminosity functions (LFs), and the halo occupation numbers (HONs) using optical data of t…
Star Formation around Mid-Infrared Bubble N37: Evidence of Cloud-Cloud Collision
Dewangan, L. K.; Ojha, D. K.; Baug, T. +1 more
We have performed a multi-wavelength analysis of a mid-infrared (MIR) bubble N37 and its surrounding environment. The selected 15‧ × 15‧ area around the bubble contains two molecular clouds (N37 cloud; {V}{lsr} ∼ 37-43 km s-1, and C25.29+0.31; {V}{lsr} ∼ 43-48 km s-1) along the line of sight. A total of …
About AGN ionization echoes, thermal echoes and ionization deficits in low-redshift Lyα blobs
Torrey, Paul; Fu, Hai; Davies, Rebecca L. +7 more
We report the discovery of 14 Lyα blobs (LABs) at z ∼ 0.3, existing at least 4-7 billion years later in the Universe than all other LABs known. Their optical diameters are 20-70 kpc, and GALEX data imply Lyα luminosities of (0.4-6.3) × 1043 erg s-1. Contrary to high-z LABs, they live in low-density areas. They are ionized by …
Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm time substorms
Russell, C. T.; Lavraud, B.; Anderson, B. J. +39 more
We report on field-aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near the plasma sheet boundary layer (PSBL) during two major substorms on 23 June 2015. Small-scale field-aligned currents were found embedded in fluctuating PSBL flux tubes near the separatrix region. We resolve, for the first time, short-lived …
Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1 < z < 4
Stern, D.; Seymour, N.; De Breuck, C. +5 more
High-redshift radio galaxies present signs of both star formation and AGN activity, making them ideal candidates to investigate the connection and coevolution of AGN and star formation in the progenitors of present-day massive galaxies. We make use of a sample of 11 powerful radio galaxies spanning 1 <z< 4 which have complete coverage of the…