Search Publications
Influence of Wolf-Rayet Stars on Surrounding Star-forming Molecular Clouds
Herczeg, Gregory J.; Bhatt, B. C.; Deng, Licai +5 more
We investigate the influence of Wolf-Rayet (W-R) stars on their surrounding star-forming molecular clouds. We study five regions containing W-R stars in the inner Galactic plane (l ∼ [14°-52°]), using multiwavelength data from near-infrared to radio wavelengths. Analysis of 13CO line data reveals that these W-R stars have developed gas-…
The Importance of Secondary Halos for Strong Lensing in Massive Galaxy Clusters across Redshift
Florian, Michael K.; Gladders, Michael D.; Li, Nan +6 more
Cosmological cluster-scale strong gravitational lensing probes the mass distribution of the dense cores of massive dark matter halos and the structures along the line of sight from background sources to the observer. It is frequently assumed that the primary lens mass dominates the lensing, with the contribution of secondary masses along the line …
Dwarf Galaxy Discoveries from the KMTNet Supernova Program. II. The NGC 3585 Group and Its Dynamical State
Cha, Sang-Mok; Lee, Yongseok; Moon, Dae-Sik +4 more
We present our discovery and analysis of dwarf galaxies in the NGC 3585 galaxy group by the Korea Microlensing Telescope Network (KMTNet) Supernova Program. Using deep stack images reaching ≃28 mag arcsec-2 in BVI, we discovered 46 dwarf galaxy candidates distributed in a field of 7 square degrees. The dwarf galaxy candidates exhibit a …
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 …