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Statistical Analysis on XMM-Newton X-Ray Flares of Mrk 421: Distributions of Peak Flux and Flaring Time Duration
Wang, Jiancheng; Zhang, Pengfei; Zhang, Li +3 more
The energy dissipation mechanism in blazar jet is unknown. Blazar flares could provide insights into this problem. Here we report statistical results of XMM-Newton observations of X-ray flares in Mrk 421. We analyze all public XMM-Newton X-ray observations for Mrk 421, and construct the light curves. Through fitting the light curves, we obtain the…
Exploring the dust content of galactic winds with Herschel - II. Nearby dwarf galaxies
Martin, Crystal L.; Veilleux, Sylvain; Bland-Hawthorn, Joss +7 more
We present the results from an analysis of deep Herschel Space Observatory observations of six nearby dwarf galaxies known to host galactic-scale winds. The superior far-infrared sensitivity and angular resolution of Herschel have allowed detection of cold circumgalactic dust features beyond the stellar components of the host galaxies traced by Sp…
The Herschel-ATLAS: magnifications and physical sizes of 500-µm-selected strongly lensed galaxies
Rodighiero, G.; Franceschini, A.; Cooray, A. +10 more
We perform lens modelling and source reconstruction of Sub-millimetre Array (SMA) data for a sample of 12 strongly lensed galaxies selected at 500µm in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). A previous analysis of the same data set used a single Sérsic profile to model the light distribution of each background gala…
A complete disclosure of the hidden type-1 AGN in NGC 1068 thanks to 52 yr of broad-band polarimetric observation
Marin, F.
We create the first broad-band polarization spectrum of an active galactic nucleus (AGN) by compiling the 0.1-100 µm, 4.9, and 15 GHz continuum polarization of NGC 1068 from more than 50 yr of observations. Despite the diversity of instruments and apertures, the observed spectrum of linear continuum polarization has distinctive wavelength-de…
Near-infrared spectroscopic observations of massive young stellar object candidates in the central molecular zone
Schultheis, M.; Ryde, N.; Rojas-Arriagada, A. +6 more
Context. The central molecular zone (CMZ) is a 200 pc region around the Galactic centre. The study of star formation in the central part of the Milky Way is of great interest as it provides a template for the closest galactic nuclei.
Aims: We present a spectroscopic follow-up of photometrically selected young stellar object (YSO) candidates i…
The bipolar jet of the symbiotic star R Aquarii: A study of its morphology using the high-resolution HST WFC3/UVIS camera
Eislöffel, Jochen; Melnikov, Stanislav; Stute, Matthias
Context. R Aqr is a symbiotic binary system consisting of a Mira variable with a pulsation period of 387 days and a hot companion which is presumably a white dwarf with an accretion disk. This binary system is the source of a prominent bipolar gaseous outflow.
Aims: We use high spatial resolution and sensitive images from the Hubble Space Tel…
Modelling the disc atmosphere of the low mass X-ray binary EXO 0748-676
Díaz Trigo, M.; Costantini, E.; Mehdipour, M. +1 more
Low mass X-ray binaries exhibit ionized emission from an extended disc atmosphere that surrounds the accretion disc. However, the atmosphere's nature and geometry is still unclear. In this work we present a spectral analysis of the extended atmosphere of EXO 0748-676 using high-resolution spectra from archival XMM-Newton observations. We model the…
Interplanetary and Geomagnetic Consequences of Interacting CMEs of 13 - 14 June 2012
Srivastava, Nandita; Mishra, Wageesh; Chakrabarty, D.
We report on the kinematics of two interacting CMEs observed on 13 and 14 June 2012. The two CMEs originated from the same active region NOAA 11504. After their launches which were separated by several hours, they were observed to interact at a distance of 100 R⊙ from the Sun. The interaction led to a moderate geomagnetic storm at the E…
Gaia Data Release 2
Tolstoy, Eline; Kotak, Rubina; Forveille, Thierry +1 more
HST-STIS spectra and the redness of Saturn's rings
French, Richard G.; Cuzzi, Jeffrey N.; Hendrix, Amanda R. +3 more
We have observed the main rings of Saturn with the Space Telescope Imaging Spectrometer (STIS) on the Hubble Space Telescope (HST), covering the spectral region from 180-570 nm (including for the first time the critical near-UV range 190-340 nm) with very good signal to noise ratio and a radial resolution of approximately 160-330 km. After correct…