Search Publications
The M101 Satellite Luminosity Function and the Halo-Halo Scatter among Local Volume Hosts
Zaritsky, D.; Crnojević, D.; Mutlu-Pakdil, B. +4 more
We have obtained deep Hubble Space Telescope (HST) imaging of 19 dwarf galaxy candidates in the vicinity of M101. Advanced Camera for Surveys HST photometry for two of these objects showed resolved stellar populations and tip of the red giant branch derived distances (D ∼ 7 Mpc) consistent with M101 group membership. The remaining 17 were found to…
The Discovery of a Gravitationally Lensed Quasar at z = 6.51
Hennawi, Joseph F.; Fan, Xiaohui; McGreer, Ian D. +17 more
Strong gravitational lensing provides a powerful probe of the physical properties of quasars and their host galaxies. A high fraction of the most luminous high-redshift quasars was predicted to be lensed due to magnification bias. However, no multiple imaged quasar was found at z > 5 in previous surveys. We report the discovery of J043947.08+16…
The Thermal, Mechanical, Structural, and Dielectric Properties of Cometary Nuclei After Rosetta
Kührt, E.; Gundlach, B.; Davidsson, B. +16 more
The physical properties of cometary nuclei observed today relate to their complex history and help to constrain their formation and evolution. In this article, we review some of the main physical properties of cometary nuclei and focus in particular on the thermal, mechanical, structural and dielectric properties, emphasising the progress made dur…
A Census of Symbiotic Stars in the 2MASS, WISE, and Gaia Surveys
Akras, Stavros; Ramos-Larios, Gerardo; Leal-Ferreira, Marcelo L. +1 more
We present a new census of Galactic and extragalactic symbiotic stars (SySts). This compilation contains 323 known and 87 candidate SySts. Of the confirmed SySts, 257 are Galactic and 66 extragalactic. The spectral energy distributions (SEDs) of 348 sources have been constructed using 2MASS and AllWISE data. Regarding the Galactic SySts, 74% are S…
The spatial relation between young star clusters and molecular clouds in M51 with LEGUS
Tosi, M.; Gallagher, J. S.; Dale, D. A. +21 more
We present a study correlating the spatial locations of young star clusters with those of molecular clouds in NGC 5194, in order to investigate the time-scale over which clusters separate from their birth clouds. The star cluster catalogues are from the Legacy ExtraGalactic UV Survey (LEGUS) and the molecular clouds from the Plateau de Bure Intere…
No Clear, Direct Evidence for Multiple Protoplanets Orbiting LkCa 15: LkCa 15 bcd are Likely Inner Disk Signals
Henning, Thomas; Currie, Thayne; Dong, Ruobing +30 more
Two studies utilizing sparse aperture-masking (SAM) interferometry and H α differential imaging have reported multiple Jovian companions around the young solar-mass star, LkCa 15 (LkCa 15 bcd): the first claimed direct detection of infant, newly formed planets (“protoplanets”). We present new near-infrared direct imaging/spectroscopy f…
Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum interband delays
Korista, K. T.; Goad, M. R.
We investigate the contribution of reprocessed continuum emission (1000-10 000 Å) originating in broad-line region (BLR) gas, the diffuse continuum (DC), to the wavelength-dependent continuum delays measured in AGN disc reverberation mapping experiments. Assuming a spherical BLR geometry, we adopt a Local Optimally emitting Cloud (LOC) model for t…
Resolved UV and [C II] Structures of Luminous Galaxies within the Epoch of Reionization
Schaerer, D.; Mobasher, B.; Ferrara, A. +7 more
We present new deep ALMA and Hubble Space Telescope (HST)/WFC3 observations of MASOSA and VR7, two luminous Lyα emitters (LAEs) at z = 6.5, for which the UV continuum levels differ by a factor of four. No IR dust continuum emission is detected in either, indicating little amounts of obscured star formation and/or high dust temperatures. MASOSA, wi…
Gone after one orbit: How cluster environments quench galaxies
Dolag, Klaus; Biviano, Andrea; Burkert, Andreas +2 more
The effect of galactic orbits on a galaxy's internal evolution within a galaxy cluster environment has been the focus of heated debate in recent years. To understand this connection, we use both the (0.5 Gpc)3 and the Gpc3 boxes from the cosmological hydrodynamical simulation set Magneticum Pathfinder. We investigate the velo…
The unbiased frequency of planetary signatures around single and binary white dwarfs using Spitzer and Hubble
Gänsicke, Boris T.; Wilson, Thomas G.; Farihi, Jay +1 more
This paper presents combined Spitzer IRAC and Hubble COS results for a double-blind survey of 195 single and 22 wide binary white dwarfs for infrared excesses and atmospheric metals. The selection criteria include cooling ages in the range 9 to 300 Myr, and hydrogen-rich atmospheres so that the presence of atmospheric metals can be confidently lin…