Search Publications
Candidate Hypervelocity Red Clump Stars in the Galactic Bulge Found Using the VVV and Gaia Surveys
Minniti, Dante; Alonso-García, Javier; Luna, Alonso
We propose a new way to search for hypervelocity stars (HVS) in the Galactic bulge, by using red clump (RC) giants, that are good distance indicators. The second Gaia Data Release and the near-IR data from the VISTA Variables in the Via Lactea (VVV) Survey led to the selection of a volume limited sample of 34 bulge RC stars. A search in this combi…
Revealing the Star-Disk-Jet Connection in GM Aur Using Multiwavelength Variability
Hernández, J.; Macías, E.; Espaillat, C. C. +1 more
We analyze the first simultaneous X-ray, ultraviolet, optical, infrared, and centimeter observations of a T Tauri star (TTS). We present three epochs of simultaneous Spitzer and Very Large Array data of GM Aur separated by ∼1 week. These data are compared to previously published Hubble Space Telescope and Chandra observations from which mass accre…
Jellyfish: Resolving the Kinematics of Extreme Ram-pressure Stripping at z ∼ 0.3
Ebeling, Harald; Kalita, Boris S.
We present and discuss results from the first spatially resolved kinematic study of ram-pressure stripping of a massive late-type galaxy at intermediate redshifts. Our target, the spectacular “jellyfish” galaxy, A1758N_JFG1, was previously identified as a fast-moving member of the equal-mass merger A1758N (z = 0.28), with a star formation rate of …
The Massive and Distant Clusters of WISE Survey. VI. Stellar Mass Fractions of a Sample of High-redshift Infrared-selected Clusters
Gupta, Nikhel; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +17 more
We present measurements of the stellar mass fractions ({f}\star ) for a sample of high-redshift (0.93 ≤ z ≤ 1.32) infrared-selected galaxy clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) and compare them to the stellar mass fractions of Sunyaev-Zel’dovich (SZ) effect-selected clusters in a similar mass and redshi…
New Candidate Planetary Nebulae in Galactic Globular Clusters from the VVV Survey
Minniti, Dante; Dias, Bruno; Gómez, Matías +2 more
Only four globular cluster planetary nebulae (GCPN) are known so far in the Milky Way. About 50 new globular clusters have been recently discovered toward the Galactic bulge. We present a search for planetary nebulae within 3‧ of the new globular clusters, revealing the identification of new candidate GCPN. These possible associations are PN SB 2 …
2003-2018 Monitoring of the Crab Nebula Polarization in Hard X-Rays with INTEGRAL SPI
Jourdain, E.; Roques, J. -P.
We analyzed 16 yr of observations dedicated to the Crab (pulsar + nebula) with the SPectrometer on International Gamma-Ray Astrophysics Laboratory instrument to investigate its polarization properties. We find that the source presents a substantially polarized emission (PF = 24%) in the hard X-ray domain, with the electric vector aligned with the …
Active Region Modulation of Coronal Hole Solar Wind
Wicks, Robert T.; Long, David M.; Harra, Louise K. +4 more
Active regions (ARs) are a candidate source of the slow solar wind (SW), the origins of which are a topic of ongoing research. We present a case study that examines the processes by which SW is modulated in the presence of an AR in the vicinity of the SW source. We compare properties of SW associated with a coronal hole (CH)-quiet Sun boundary to …
Quantifying the Propagation of Fast Coronal Mass Ejections from the Sun to Interplanetary Space by Combining Remote Sensing and Multi-point In Situ Observations
Wang, Rui; Liu, Ying D.; Hu, Huidong +1 more
In order to have a comprehensive view of the propagation and evolution of coronal mass ejections (CMEs) from the Sun to deep interplanetary space beyond 1 au, we carry out a kinematic analysis of seven CMEs in solar cycle 23. The events are required to have coordinated coronagraph observations, interplanetary type II radio bursts, and multi-point …
Precise Mass Determination of SPT-CL J2106-5844, the Most Massive Cluster at z > 1
Huang, Xiaosheng; Rubin, David; Perlmutter, Saul +5 more
We present a detailed high-resolution weak-lensing study of SPT-CL J2106-5844 at z = 1.132, claimed to be the most massive system discovered at z > 1 in the South Pole Telescope Sunyaev-Zel’dovich survey. Based on the deep imaging data from the Advanced Camera for Surveys and Wide Field Camera 3 on board the Hubble Space Telescope, we find that…
A Three-dimensional View of Molecular Hydrogen in SN 1987A
Larsson, J.; Spyromilio, J.; Fransson, C. +6 more
SN 1987A is the only young supernova (SN) in which H2 has been detected in the ejecta. The properties of H2 are important for understanding the explosion and the ejecta chemistry. Here we present new Very Large Telescope/SINFONI observations of H2 in SN 1987A, focusing on the 2.12 µm (1,0)S(1) line. We find t…