Search Publications
Evidence for a Merger-induced Shock Wave in ZwCl 0008.8+5215 with Chandra and Suzaku
Di Gennaro, G.; Brunetti, G.; Forman, W. +8 more
We present the results from new deep Chandra (∼410 ks) and Suzaku (∼180 ks) observations of the merging galaxy cluster ZwCl 0008.8+5215 (z = 0.104). Previous radio observations revealed the presence of a double radio relic located diametrically west and east of the cluster center. Using our new Chandra data, we find evidence for the presence of a …
New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts, and much more
Segreto, A.; Ferrigno, C.; Malzac, J. +7 more
1RXS J180408.9-342058 is a low-mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddington luminosity. In this work, we present a comprehensive X-ray study of this source using data from the Neil Gehrels Swift Observatory, NuSTAR, and INTEGRAL/JEM-X. In orde…
The Structure of Solar Coronal Mass Ejections in the Extreme-ultraviolet Passbands
Chen, Y.; Song, H. Q.; Zhang, J. +5 more
So far, most studies on the structure of coronal mass ejections (CMEs) are conducted through white-light coronagraphs, demonstrating that about one third of CMEs exhibit the typical three-part structure in the high corona (e.g., beyond 2 {R}⊙ ), i.e., the bright front, the dark cavity, and the bright core. In this paper, we address the …
Magnetic topologies of young suns: the weak-line T Tauri stars TWA 6 and TWA 8A
Donati, J. -F.; Alencar, S. H. P.; Hussain, G. A. J. +5 more
We present a spectropolarimetric study of two weak-line T Tauri stars (wTTSs), TWA 6, and TWA 8A, as part of the MaTYSSE (Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets) programme. Both stars display significant Zeeman signatures that we have modelled using Zeeman Doppler Imaging (ZDI). The magnetic field of TWA 6…
Photometric investigations on two totally eclipsing contact binaries: V342 UMa and V509 Cam
Zhang, Yu; Li, Kai; Xia, Qi-Qi +6 more
By analyzing two sets of complete BVRcIc light curves for V342 UMa and three sets of complete BVRcIc light curves for V509 Cam, we determined that the two systems are both W-subtype contact binaries and that V342 UMa manifests a shallow contact configuration, while V509 Cam exhibits a medium contact conf…
Isochrone fitting of Galactic globular clusters - I. NGC 5904
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu
We present new isochrone fits to colour-magnitude diagrams of the Galactic globular cluster NGC 5904 (M5). We utilize 29 photometric bands from the ultraviolet to mid-infrared by the use of the data from the Hubble Space Telescope, Gaia DR2, Wide-field Infrared Survey Explorer, Sloan Digital Sky Survey (SDSS), and other photometric data. In our is…
Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - IV. Evidence for multiple populations in Hodge 11 and NGC 2210
Ventura, Paolo; Cohen, Roger E.; Sarajedini, Ata +10 more
We present a multiple population search in two old Large Magellanic Cloud (LMC) Globular clusters, Hodge 11 and NGC 2210. This work uses data from the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope from programme GO-14164 in Cycle 23. Both of these clusters exhibit a broadened main sequence with the second popula…
The Expansion of the Forward Shock of 1E 0102.2-7219 in X-Rays
Hughes, John P.; Plucinsky, Paul P.; Patnaude, Daniel J. +2 more
We measure the expansion of the forward shock of the Small Magellanic Cloud supernova remnant 1E 0102.2-7219 in X-rays using Chandra X-Ray Observatory on-axis Advanced CCD Imaging Spectrometer observations from 1999 to 2016. We estimate an expansion rate of 0.025% ± 0.006% yr-1 and a blast wave velocity of (1.61+/- 0.37)× {10}3
High-velocity string of knots in the outburst of the planetary nebula Hb4
Boumis, P.; Derlopa, S.; Akras, S. +1 more
The bipolar collimated outflows of the Hb4 planetary nebula (PN) exhibit an evident decrease in their expansion velocity with respect to the distance from the central star. So far, similar velocity law has also been found in Herbig-Haro objects. The interpretation of this peculiar velocity law and the classification of the outflows is the main foc…
Towards sub-kpc scale kinematics of molecular and ionized gas of star-forming galaxies at z ∼ 1
Chisholm, J.; Schaerer, D.; Dessauges-Zavadsky, M. +4 more
We compare the molecular and ionized gas kinematics of two strongly lensed galaxies at z ∼ 1 that lie on the main sequence at this redshift. The observations were made with ALMA and MUSE, respectively. We derive the CO and [O II] rotation curves and dispersion profiles of these two galaxies. We find a difference between the observed molecular and …