Search Publications
Investigation of the globular cluster NGC 2808 with the Ultra-Violet Imaging Telescope
Vig, S.; Ghosh, S. K.; Jain, Rashi
Globular clusters represent stellar laboratories where observations can be used to validate models of stellar evolution. In this study, we put forth new ultraviolet (UV) photometric results of stars in the Galactic globular cluster NGC 2808. NGC 2808 is known to host multiple stellar populations that include at least four distinct groups of horizo…
Analysis of night-side dust activity on comet 67P observed by VIRTIS-M: a new method to constrain the thermal inertia on the surface
Mottola, S.; Naletto, G.; Vincent, J. -B. +26 more
On 2015 July 18, near perihelion at a heliocentric distance of 1.28 au, the Visible InfraRed Thermal Imaging Spectrometer (VIRTIS-M) on board the Rosetta spacecraft had the opportunity of observing dust activity in the inner coma with a view of the night side (shadowed side) of comet 67P/Churyumov-Gerasimenko. At the time of the measurements we pr…
Investigating the origin of the faint non-thermal emission of the Arches cluster using the 2015-2016 NuSTAR and XMM-Newton X-ray observations
Mori, Kaya; Zhang, Shuo; Tomsick, John +7 more
Recent NuSTAR and XMM-Newton observations of the molecular cloud around the Arches stellar cluster demonstrate a dramatic change both in morphology and intensity of its non-thermal X-ray emission, similar to that observed in many molecular clouds of the Central Molecular Zone at the Galactic Center. These variations trace the propagation of illumi…
On the Relation between Flare and CME during GLE-SEP and Non-GLE-SEP Events
Gan, W. Q.; Moon, Y. -J.; Rodríguez-Pacheco, J. +2 more
Association of solar flares and coronal mass ejections (CMEs) with ground-level enhancement (GLE) is a recognized fact, but questions arise when a similar association is observed for non-GLEs. In this respect, we carry out a detailed study of the relation between flare fluences (ϕ J m-2) and CME speeds (V cme km s-1
FUSE Spectroscopic Analysis of the Slowest Symbiotic Nova AG Peg During Quiescence
Sion, Edward M.; Godon, Patrick; Mikolajewska, Joanna +1 more
We present a far-UV (FUV) spectroscopic analysis of the slowest known symbiotic nova AG Peg that underwent a nova explosion in 1850 followed by a very slow decline that did not end until ∼1996, marking the beginning of quiescence. In 2015 June, when AG Peg exhibited a Z And-type outburst with an optical amplitude of ∼1.5 mag. We used accretion dis…
The XMM-Newton wide field survey in the COSMOS field: Clustering dependence of X-ray selected AGN on host galaxy properties
Finoguenov, A.; Salvato, M.; Gilli, R. +5 more
Aims: We study the spatial clustering of 632 (1130) XMM-COSMOS active galactic nuclei (AGNs) with known spectroscopic or photometric redshifts in the range z = [0.1-2.5] in order to measure the AGN bias and estimate the typical mass of the hosting dark matter (DM) halo as a function of AGN host galaxy properties.
Methods: We created AGN …
The Period Change of Cyg X-3
Antokhin, Igor I.; Cherepashchuk, Anatol M.
By using available archival X-ray data, we significantly extended the list of times of X-ray minima. The new list includes 65 data points obtained by critically reanalyzing RXTE ASM data, 88 data points based on observations by MAXI, and 2 data points based on observations by SUZAKU and AstroSat. Analyzing the data along with times of X-ray minima…
Time-series Spectroscopy of the Oscillating Eclipsing Algol System V392 Orionis
Koo, Jae-Rim; Han, Cheongho; Kim, Seung-Lee +5 more
We present the results from a detailed analysis of our high-resolution spectra and historical photometric observations of the semidetached eclipsing binary V392 Ori with a δ Scuti (δ Sct) pulsating component. A total of 31 spectroscopic observations were carried out at both the Bohyunsan Optical Astronomy Observatory in Korea and the Thai National…
The Composite Nature of Dust-obscured Galaxies (DOGs) at z ∼ 2-3 in the COSMOS Field. II. The AGN Fraction
Koekemoer, Anton M.; Schawinski, Kevin; Lusso, Elisabeta +18 more
We present the X-ray properties of 108 Dust-Obscured Galaxies (DOGs; F 24 µm/F R > 1000) in the COSMOS field, all of which are detected in at least three far-infrared bands with the Herschel Observatory. Out of the entire sample, 22 are individually detected in the hard 2-8 keV X-ray band by the Chandra COSMOS Lega…
New Evidence for Third Harmonic Electromagnetic Radiation in Interplanetary Type III Solar Radio Bursts
MacDowall, R. J.; Reiner, M. J.
This article provides new evidence for a third harmonic component in the electromagnetic radiation generated by interplanetary type III solar radio bursts observed locally near 1 AU. This evidence comes mainly from the analysis of the low-frequency radio emissions observed by the Wind spacecraft. The analysis examines, at high-time and high-freque…