Search Publications
Dust-obscured Galaxies in the Local Universe
Hwang, Ho Seong; Geller, Margaret J.
We use Wide-field Infrared Survey Explorer (WISE), AKARI, and Galaxy Evolution Explorer (GALEX) data to select local analogs of high-redshift (z ~ 2) dust obscured galaxies (DOGs). We identify 47 local DOGs with S 12 µm/S 0.22 µm >= 892 and S 12 µm > 20 mJy at 0.05 < z < 0.08 in the Sl…
Discovery of a Giant Radio Halo in a New Planck Galaxy Cluster PLCKG171.9-40.7
Wik, Daniel R.; Giacintucci, Simona; Venturi, Tiziana +2 more
We report the discovery of a giant radio halo in a new, hot, X-ray luminous galaxy cluster recently found by Planck, PLCKG171.9-40.7. The radio halo was found using Giant Metrewave Radio Telescope observations at 235 MHz and 610 MHz, and in the 1.4 GHz data from an NRAO Very Large Array Sky Survey pointing that we have reanalyzed. The diffuse radi…
A Search for Rapidly Accreting White Dwarfs in the Small Magellanic Cloud
Lepo, Kelly; van Kerkwijk, Marten
The nature of the progenitors of Type Ia supernovae (SNe Ia) is still a mystery. While plausible candidates are known for both the single-degenerate and double-degenerate models, the observed numbers fall significantly short of what is required to reproduce the SNe Ia rate. Some of the most promising single-degenerate Type Ia progenitors are recur…
The 2011 Periastron Passage of the Be Binary δ Scorpii
Okazaki, A. T.; Miroshnichenko, A. S.; Pasechnik, A. V. +19 more
We describe the results of the world-wide observing campaign of the highly eccentric Be binary system δ Scorpii 2011 periastron passage which involved professional and amateur astronomers. Our spectroscopic observations provided a precise measurement of the system orbital period at 10.8092 ± 0.0005 yr. Fitting of the He II 4686 Å line radial veloc…
New Suns in the Cosmos?
Catelan, M.; Ferreira Lopes, C. E.; De Medeiros, J. R. +5 more
The present work reports on the discovery of three stars that we have identified to be rotating Sun-like stars, based on rotational modulation signatures inferred from light curves from the CoRoT mission's Public Archives. In our analysis, we performed an initial selection based on the rotation period and position in the period-T eff di…
Hubble Space Telescope and Ground-based Observations of V455 Andromedae Post-outburst
Szkody, Paula; Sion, Edward M.; Gänsicke, Boris T. +8 more
Hubble Space Telescope spectra obtained in 2010 and 2011, 3 and 4 yr after the large amplitude dwarf nova outburst of V455 And, were combined with optical photometry and spectra to study the cooling of the white dwarf, its spin, and possible pulsation periods after the outburst. The modeling of the ultraviolet (UV) spectra shows that the white dwa…
Suzaku Observations of the Type 2 QSO in the Central Galaxy of the Phoenix Cluster
Koyama, Katsuji; Hayashida, Kiyoshi; Nakajima, Hiroshi +3 more
We report the Suzaku/XIS and HXD and Chandra/ACIS-I results on the X-ray spectra of the Phoenix cluster at the redshift z = 0.596. The spectrum of the intracluster medium (ICM) is well reproduced with the emissions from low-temperature (~3.0 keV and ~0.76 solar) and high-temperature (~11 keV and ~0.33 solar) plasmas; the former is localized at the…
Origin of the Dense Core Mass Function in Contracting Filaments
Myers, Philip C.
Mass functions of starless dense cores (CMFs) may arise from contraction and dispersal of core-forming filaments. In an illustrative model, a filament contracts radially by self-gravity, increasing the mass of its cores. During this contraction, FUV photoevaporation and ablation by shocks and winds disperse filament gas and limit core growth. The …
The ACS Virgo Cluster Survey. XVII. The Spatial Alignment of Globular Cluster Systems with Early-type Host Galaxies
Jordán, Andrés; Côté, Patrick; Peng, Eric W. +5 more
We study the azimuthal distribution of globular clusters (GCs) in early-type galaxies and compare them to their host galaxies using data from the ACS Virgo Cluster Survey. We find that in host galaxies with visible elongation (epsilon > 0.2) and intermediate to high luminosities (Mz < -19), the GCs are preferentially aligned along…
ALMA Observations of the Coldest Place in the Universe: The Boomerang Nebula
Sahai, R.; Huggins, P. J.; Vlemmings, W. H. T. +2 more
The Boomerang Nebula is the coldest known object in the universe, and an extreme member of the class of pre-planetary nebulae, objects which represent a short-lived transitional phase between the asymptotic giant branch and planetary nebula evolutionary stages. Previous single-dish CO (J = 1-0) observations (with a 45'' beam) showed that the high-…