Search Publications
Quantum gravity and the large scale anomaly
Kamenshchik, Alexander Y.; Tronconi, Alessandro; Venturi, Giovanni
The spectrum of primordial perturbations obtained by calculating the quantum gravitational corrections to the dynamics of scalar perturbations is compared with Planck 2013 and BICEP2/Keck Array public data. The quantum gravitational effects are calculated in the context of a Wheeler-De Witt approach and have quite distinctive features. We constrai…
Ionized gas at the edge of the central molecular zone
Goldsmith, P. F.; Langer, W. D.; Requena-Torres, M. A. +3 more
Context. The edge of the central molecular zone (CMZ) is the location where massive dense molecular clouds with large internal velocity dispersions transition to the surrounding more quiescent and lower CO emissivity region of the Galaxy. Little is known about the ionized gas surrounding the molecular clouds and in the transition region.
Aims…
Volcanism-induced, local wet-based glacial conditions recorded in the Late Amazonian Arsia Mons tropical mountain glacier deposits
Head, James W.; Marchant, David R.; Scanlon, Kathleen E.
The tropical mountain glacial fan-shaped deposit (FSD) to the northwest of the Arsia Mons volcano on Mars contains numerous glacial and volcanic landforms. While most of the glacial landforms are interpreted to have formed by cold-based glacial processes, several glacial landforms near glaciovolcanic edifices are more consistent with localized wet…
The Dragonfly Galaxy. II. ALMA unveils a triple merger and gas exchange in a hyper-luminous radio galaxy at z = 2
Villar-Martín, M.; Seymour, N.; Nesvadba, N. +9 more
The Dragonfly Galaxy (MRC 0152-209), at redshift z ~ 2, is one of the most vigorously star-forming radio galaxies in the Universe. What triggered its activity? We present ALMA Cycle 2 observations of cold molecular CO(6-5) gas and dust, which reveal that this is likely a gas-rich triple merger. It consists of a close double nucleus (separation ~4 …
Physical Conditions of Coronal Plasma at the Transit of a Shock Driven by a Coronal Mass Ejection
Bemporad, A.; Susino, R.; Mancuso, S.
We report here on the determination of plasma physical parameters across a shock driven by a coronal mass ejection using white light (WL) coronagraphic images and radio dynamic spectra (RDS). The event analyzed here is the spectacular eruption that occurred on 2011 June 7, a fast CME followed by the ejection of columns of chromospheric plasma, par…
The VMC/VEx photometry at small phase angles: Glory and the physical properties of particles in the upper cloud layer of Venus
Markiewicz, Wojciech J.; Petrova, Elena V.; Shalygina, Oksana S.
With the Venus Monitoring Camera onboard the Venus Express orbiter, for the first time full glory on the upper cloud layer of Venus has been imaged. Images were acquired in three wavelengths of 0.365, 0.513, and 0.965 µm. Glory is an optical phenomenon that poses stringent constraints on the cloud properties. The fact of the observed glory i…
Short- and Long-Term Radio Variability of Young Stars in The Orion Nebula Cluster and Molecular Cloud
Martín-Pintado, J.; Sanz-Forcada, J.; Chandler, C. J. +3 more
We have used the Karl G. Jansky Very Large Array (VLA) to carry out multi-epoch radio continuum monitoring of the Orion Nebula Cluster (ONC) and the background Orion Molecular Cloud (OMC; 3 epochs at Q band and 11 epochs at Ka band). Our new observations reveal the presence of 19 radio sources, mainly concentrated in the Trapezium Cluster and the …
Panchromatic Hubble Andromeda Treasury XIII: The Cepheid period-luminosity relation in M31
Dalcanton, J. J.; Wagner-Kaiser, R.; Sarajedini, A. +2 more
Using Hubble Space Telescope Advanced Camera for Surveys (HST/ACS) and Wide Field Camera 3 (WFC3) observations from the Panchromatic Hubble Andromeda Treasury (PHAT), we present new period-luminosity (P-L) relations for Cepheid variables in M31. Cepheids from several ground-based studies are identified in the PHAT photometry to derive new P-L and …
Testing the homogeneity of the Universe using gamma-ray bursts
Li, Ming-Hua; Lin, Hai-Nan
Aims: The discovery of a statistically significant clustering in the distribution of gamma-ray bursts (GRBs) has recently been reported. Given that the cluster has a characteristic size of 2000-3000 Mpc and a redshift between 1.6 ≤ z ≤ 2.1, it has been claimed that this structure is incompatible with the cosmological principle of homogeneity …
New insights from deep VLA data on the potentially recoiling black hole CID-42 in the COSMOS field
Elvis, Martin; Loeb, Abraham; Hallinan, Gregg +12 more
We present deep 3-GHz Karl G. Jansky Very Large Array (VLA) observations of the potentially recoiling black hole CID-42 in the Cosmic Evolution Survey (COSMOS) field. This galaxy shows two optical nuclei in the Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) image and a large velocity offset of ≈1300 km s-1 between the broa…