Search Publications
Low-end mass function of the arches cluster
Kim, Sungsoo S.; Shin, Jihye
The initial mass function (IMF) of the Arches cluster, which was formed a few million years ago in the harsh environment of the Galactic Centre (GC), has long been a target of interest to those who study the GC and the theory of star formation. The distinct star-forming conditions in the GC might have caused the cluster to have a shallower slope o…
Infrared Spectral Properties of M Giants
Sloan, G. C.; Goes, C.; Ramirez, R. M. +2 more
We observed a sample of 20 M giants with the Infrared Spectrograph on the Spitzer Space Telescope. Most show absorption structure at 6.6-6.8 µm which we identify as water vapor, and in some cases, the absorption extends from 6.4 µm into the SiO band at 7.5 µm. Variable stars show stronger H2O absorption. While the stre…
Multiscale field-aligned current analyzer
Marghitu, O.; Narita, Y.; Vogt, J. +3 more
The magnetosphere-ionosphere coupling is achieved, essentially, by a superposition of quasi-stationary and time-dependent field-aligned currents (FACs), over a broad range of spatial and temporal scales. The planarity of the FAC structures observed by satellite data and the orientation of the planar FAC sheets can be investigated by the well-estab…
Submillimeter Observations of CLASH 2882 and the Evolution of Dust in this Galaxy
Staguhn, Johannes; Walter, Fabian; Egami, Eiichi +7 more
Two millimeter observations of the MACS J1149.6+2223 cluster have detected a source that was consistent with the location of the lensed MACS 1149-JD galaxy at z = 9.6. A positive identification would have rendered this galaxy as the youngest dust forming galaxy in the universe. Follow up observation with the AzTEC 1.1 mm camera and the IRAM NOrthe…
Consistency of the nonflat Λ CDM model with the new result from BOSS
Kumar, Suresh
Using 137,562 quasars in the redshift range 2.1 ≤z ≤3.5 from the data release 11 (DR11) of the baryon oscillation spectroscopic survey (BOSS) of Sloan Digital Sky Survey (SDSS)-III, the BOSS-SDSS collaboration estimated the expansion rate H (z =2.34 )=222 ±7 km /s /Mpc of the Universe, and reported that this value is in tension with the prediction…
Detection of Solar Wind Disturbances: Mexican Array Radio Telescope IPS Observations at 140 MHz
Aguilar-Rodriguez, E.; Gonzalez-Esparza, J. A.; Romero-Hernandez, E. +2 more
The interplanetary scintillation (IPS) technique is a remote-sensing method for monitoring solar-wind perturbations. The Mexican Array Radio Telescope (MEXART) is a single-station instrument operating at 140 MHz, fully dedicated to performing solar-wind studies employing the IPS technique. We report MEXART solar-wind measurements (scintillation in…
Martian electron density profiles retrieved from Mars Express dual-frequency radio occultation measurements
Cui, J.; Zhang, S. J.; Guo, P. +4 more
The S- and X-band dual-frequency Doppler radio occultation observations obtained by the Mars Express Radio Science (MaRS) experiments are reduced in this study. A total of 414 Martian electron density profiles are retrieved covering the period from DOY 93 2004 to DOY 304 2012. These observations are well distributed over both longitude and latitud…
Outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861: constraining the baryonic content through stellar population synthesis studies
Rosado, M.; Gabbasov, R.; Repetto, P. +1 more
In this paper, we investigate the outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861, taking advantage of published H I and H α high-resolution rotation curves and constraining the stellar disc of both galaxies throughout stellar population synthesis studies. In addition, we take into account the gas content of bot…
Electron-scale nested quadrupole Hall field in Cluster observations of magnetic reconnection
Jain, N.; Sharma, A. S.
This paper presents the first evidence of a new and unique feature of spontaneous reconnection at multiple sites in electron current sheet, viz. a "nested quadrupole" structure of the Hall field at electron scales, in Cluster observations. The new nested quadrupole is a consequence of electron-scale processes in reconnection. Whistler response of …
Discovery of Five Candidate Analogs for η Carinae in Nearby Galaxies
Sonneborn, G.; Kochanek, C. S.; Stanek, K. Z. +2 more
The late-stage evolution of very massive stars such as η Carinae may be dominated by episodic mass ejections that may later lead to Type II superluminous supernova (SLSN-II; e.g., SN 2006gy). However, as long as η Car is one of a kind, it is nearly impossible to quantitatively evaluate these possibilities. Here, we announce the discovery of five o…