Search Publications
Ultra-faint high-redshift galaxies in the Frontier Fields
Salvaterra, R.; Vanzella, E.; Ferrara, A. +1 more
By combining cosmological simulations with Frontier Field (FF) project lens models, we find that, in the most optimistic case, galaxies as faint as m ≈ 33-34 (AB magnitude at 1.6 µm) can be detected in the Frontier Fields. Such faint galaxies are hosted by dark matter haloes of mass ~109 M⊙ and dominate the ionizing pho…
Titan dune heights retrieval by using Cassini Radar Altimeter
Seu, R.; Poggiali, V.; Mastrogiuseppe, M. +2 more
The Cassini Radar is a Ku band multimode instrument capable of providing topographic and mapping information. During several of the 93 Titan fly-bys performed by Cassini, the radar collected a large amount of data observing many dune fields in multiple modes such as SAR, Altimeter, Scatterometer and Radiometer. Understanding dune characteristics, …
Dramatic Change in Jupiter's Great Red Spot from Spacecraft Observations
de Pater, Imke; Wong, Michael H.; Orton, Glenn S. +5 more
Jupiter's Great Red Spot (GRS) is one of its most distinct and enduring features. Since the advent of modern telescopes, keen observers have noted its appearance and documented a change in shape from very oblong to oval, confirmed in measurements from spacecraft data. It currently spans the smallest latitude and longitude size ever recorded. Here …
A signature of chromospheric activity in brown dwarfs revealed by 2.5-5.0 µm AKARI spectra
Yamamura, I.; Sorahana, S.; Suzuki, T. K.
We propose that the 2.7-µm H2O, 3.3-µm CH4 and 4.6-µm CO absorption bands can be good tracers of chromospheric activity in brown dwarfs. In our previous study, we found that there are difficulties in explaining entire spectra between 1.0 and 5.0 µm with the unified cloudy model (UCM), a brown dwarf atm…
The Second-generation z (Redshift) and Early Universe Spectrometer. I. First-light Observation of a Highly Lensed Local-ulirg Analog at High-z
Hasselfield, Matthew; Halpern, Mark; Menten, Karl M. +20 more
We recently commissioned our new spectrometer, the second-generation z(Redshift) and Early Universe Spectrometer (ZEUS-2) on the Atacama Pathfinder Experiment telescope. ZEUS-2 is a submillimeter grating spectrometer optimized for detecting the faint and broad lines from distant galaxies that are redshifted into the telluric windows from 200 to 85…
Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view
D'Elia, V.; González-Nuevo, J.; Lähteenmäki, A. +22 more
The Large Area Telescope on board the Fermi Gamma-ray Space Telescope detected a strong γ-ray flare on 2011 May 15 from a source identified as 4C +49.22, a flat spectrum radio quasar (FSRQ) also known as S4 1150+49. This blazar, characterized by a prominent radio-optical-X-ray jet, was in a low γ-ray activity state during the first years of Fermi …
A Pulsation Search among Young Brown Dwarfs and Very-low-mass Stars
Cody, Ann Marie; Hillenbrand, Lynne A.
In 2005, Palla & Baraffe proposed that brown dwarfs (BDs) and very-low-mass stars (VLMSs; < 0.1 solar masses) may be unstable to radial oscillations during the pre-main-sequence deuterium burning phase. With associated periods of one to four hours, this potentially new class of pulsation offers unprecedented opportunities to probe the inter…
Astrometry, Radial Velocity, and Photometry: The HD 128311 System Remixed with Data from HST, HET, and APT
Cochran, William D.; Henry, Gregory W.; Benedict, G. Fritz +5 more
We have used high-cadence radial velocity measurements from the Hobby-Eberly Telescope with published velocities from the Lick 3 m Shane Telescope, combined with astrometric data from the Hubble Space Telescope (HST) Fine Guidance Sensors to refine the orbital parameters of the HD 128311 system, and determine an inclination of 55.°95 ± 14.°55 and …
The effect of solar flares, coronal mass ejections, and solar wind streams on Venus’ 5577 Å oxygen green line
Molaverdikhani, K.; Chanover, N. J.; Slanger, T. G. +1 more
We observed the Venusian 5577.3 Å OI (1S-1D) (oxygen green line) nightglow emission feature after solar flares, coronal mass ejections (CMEs), and solar wind streams from December 2010 to July 2012 using the high resolution Astrophysical Research Consortium Echelle Spectrograph on the Apache Point Observatory 3.5 m telescope.…
The PEP survey: infrared properties of radio-selected AGN
Berta, S.; Magnelli, B.; Lutz, D. +6 more
By exploiting the VLA-COSMOS and the Herschel-PEP surveys, we investigate the far-infrared (FIR) properties of radio-selected AGN. To this purpose, from VLA-COSMOS we considered the 1537, F1.4 GHz ≥ 0.06 mJy sources with a reliable redshift estimate, and sub-divided them into star-forming galaxies and AGN solely on the basis of their ra…