Search Publications
After the Fall: The Dust and Gas in E+A Post-starburst Galaxies
Draine, B. T.; Dale, D. A.; Crocker, A. F. +11 more
The traditional picture of post-starburst galaxies as dust- and gas-poor merger remnants, rapidly transitioning to quiescence, has been recently challenged. Unexpected detections of a significant interstellar medium (ISM) in many post-starburst galaxies raise important questions. Are they truly quiescent, and if so, what mechanisms inhibit further…
Propagation of cosmic rays in heliosphere: The HELMOD model
Gervasi, M.; Rancoita, P. G.; Boschini, M. J. +2 more
The heliospheric modulation model HELMOD is a two dimensional treatment dealing with the helio-colatitude and radial distance from Sun and is employed to solve the transport-equation for the GCR propagation through the heliosphere down to Earth. This work presents the current version 3 of the HELMOD model and reviews how main processes involved in…
A Robust Tip of the Red Giant Branch Distance to the Fireworks Galaxy (NGC 6946)
Anand, Gagandeep S.; Tully, R. Brent; Rizzi, Luca
Archival HST data taken in F606W+F814W of two different fields in the outer regions of NGC 6946 is used to measure a tip of the red giant branch distance to the galaxy. We employ a Bayesian maximum-likelihood modeling method that incorporates the completeness of the photometry, and allows us to model the luminosity function of the RGB population. …
Investigating the rotational phase of stellar flares on M dwarfs using K2 short cadence data
Doyle, J. G.; Ramsay, G.; Wu, K. +2 more
We present an analysis of K2 short cadence data of 34 M dwarfs which have spectral types in the range M0-L1. Of these stars, 31 showed flares with a duration between ∼10 and 90min. Using distances obtained from Gaia DR2 parallaxes, we determined the energy of the flares to be in the range ∼1.2 × 1029-6 × 1034 erg. In agreemen…
DES meets Gaia: discovery of strongly lensed quasars from a multiplet search
Benoit-Lévy, A.; Bechtol, K.; Smith, M. +69 more
We report the discovery, spectroscopic confirmation, and first lens models of the first, strongly lensed quasars from a combined search in WISE and Gaia-DR1 over the DES footprint. Their Einstein radii span a range between ≈2.0 arcsec and ≈0.4 arcsec. Two of these (WGD2038-4008, RA = 20:38:02.65, Dec. = -40:08:14.64; WGD2021-4115, RA = 20:21:39.45…
Oscillating red giants in eclipsing binary systems: empirical reference value for asteroseismic scaling relation
Handberg, R.; Barban, C.; Hekker, S. +10 more
The internal structures and properties of oscillating red-giant stars can be accurately inferred through their global oscillation modes (asteroseismology). Based on 1460 d of Kepler observations we perform a thorough asteroseismic study to probe the stellar parameters and evolutionary stages of three red giants in eclipsing binary systems. We pres…
A dust twin of Cas A: cool dust and 21 µm silicate dust feature in the supernova remnant G54.1+0.3
Rho, J.; Smith, M. W. L.; Gomez, H. L. +6 more
We present infrared (IR) and submillimetre observations of the Crab-like supernova remnant (SNR) G54.1+0.3 including 350µm (SHARC-II), 870µm (LABOCA), 70, 100, 160, 250, 350, and 500 µm (Herschel), and 3-40 µm (Spitzer). We detect dust features at 9, 11, and 21 µm and a long-wavelength continuum dust component. The 21…
Reconnection Fluxes in Eruptive and Confined Flares and Implications for Superflares on the Sun
Veronig, Astrid M.; Hinterreiter, Jürgen; Pötzi, Werner +2 more
We study the energy release process of a set of 51 flares (32 confined, 19 eruptive) ranging from GOES class B3 to X17. We use Hα filtergrams from Kanzelhöhe Observatory together with Solar Dynamics Observatory HMI and Solar and Heliospheric Observatory MDI magnetograms to derive magnetic reconnection fluxes and rates. The flare reconnection flux …
Gaia unveils the kinematics of multiple stellar populations in 47 Tucanae
Milone, A. P.; Marino, A. F.; Lagioia, E. P. +1 more
The series of events, which occurred at high redshift and originated multiple stellar populations in Globular Clusters (GCs) are still poorly understood. Theoretical work suggests that the present-day dynamics of stars in nearby GCs, including the rotation and velocity dispersion, may retain important clues on the formation of multiple populations…
ALMA view of a massive spheroid progenitor: a compact rotating core of molecular gas in an AGN host at z = 2.226
Cimatti, A.; Daddi, E.; Pozzi, F. +16 more
We present ALMA observations at 107.291 GHz (band 3) and 214.532 GHz (band 6) of GMASS 0953, a star-forming galaxy at z = 2.226 hosting an obscured active galactic nucleus (AGN) that has been proposed as a progenitor of compact quiescent galaxies (QGs). We measure for the first time the size of the dust and molecular gas emission of GMASS 0953 tha…