Search Publications
A broad-band X-ray study of the asynchronous polar CD Ind
Dutta, Anirban; Rana, Vikram
We present a simultaneous broad-band analysis of X-ray data obtained with the XMM-Newton and the Nuclear Spectroscopic Telescope Array (NuSTAR) for the asynchronous polar source, CD Ind. The spin-folded light curve in the soft 0.3-3.0 keV band shows a single broad hump-like structure superimposed with occasional narrow dips, indicating a single-po…
Discovery of a highly eccentric, chromospherically active binary: ASASSN-V J192114.84+624950.8
Kochanek, C. S.; Holoien, Thomas W. -S.; Stanek, K. Z. +5 more
As part of an All-Sky Automated Survey for SuperNovae (ASAS-SN) search for sources with large flux decrements, we discovered a transient where the quiescent, stellar source ASASSN-V J192114.84+624950.8 rapidly decreased in flux by $\sim 55{{\ \rm per\ cent}}$ (~0.9 mag) in the g band. The Transiting Exoplanet Survey Satellite light curve revealed …
Statistical properties of cataclysmic variables in the local galactic disc: a joint analysis of Gaia and XMM-Newton data
Wang, Q. Daniel; Xu, Xiao-jie; Li, Xiangdong
Cataclysmic variables (CVs) represent a key evolutionary phase of many low-mass stellar binaries and appear to collectively dominate the galactic X-ray background above ~1 keV. Statistical properties of CVs, however, remain poorly understood, even in the solar neighbourhood. We aim to obtain an X-ray luminosity-complete sample of local CVs whose d…
Herschel discovery of far-infrared emission from the hotspot D in the radio galaxy Cygnus A
Isobe, Naoki; Tashiro, Makoto S.; Sunada, Yuji +3 more
The far-infrared counterpart of hotspot D, the terminal hotspot of the eastern jet hosted by the radio galaxy Cygnus A, is detected with Herschel Aperture photometry of the source performed in 5 photometric bands covering the wavelength range of 70-350 $\mu$m. After removing the contamination from another nearby hotspot, E, the far-infrared intens…
Fast prograde coronal flows in solar active regions
Chamberlin, Phillip C.; Fletcher, Lyndsay; Mulay, Sargam M. +6 more
We report the discovery and characterization of high-speed (>100 km s-1) horizontal flows in solar active regions, making use of the Sun-as-a-star spectroscopy in the range 5-105 nm provided by the EVE (Extreme Ultraviolet Variability Experiment) spectrometers on the Solar Dynamics Observatory. These apparent flows are persistent on …
Chandra revisits WR 48a: testing colliding wind models in massive binaries
Skinner, Stephen L.; Zhekov, Svetozar A.; Gagné, Marc
We present results of new Chandra High-Energy Transmission Grating (HETG) observations (2019 November-December) of the massive Wolf-Rayet binary WR 48a. Analysis of these high-quality data showed that the spectral lines in this massive binary are broadened (full width at half-maximum, FWHM = 1400 km s-1) and marginally blueshifted (~-10…
Unravelling the nature of the dual AGN in the galaxy pair system IRAS 05589+2828 and 2MASX J06021107 + 2828382
Jiménez-Bailón, E.; Marziani, P.; Chavushyan, V. H. +10 more
We have studied the nuclear region of the previously detected dual AGN system in the galaxy pair IRAS 05589 + 2828 and 2MASX J06021107 + 2828382, through new optical spectroscopy observations, along with radio and X-ray archival data. Our multiwavelength data strongly suggest that the Sy1 IRAS 05589+2828 (z = 0.0330 ± 0.0002) conforms to a dual AG…
Spiral density-wave structure parameters in the solar neighbourhood derived from longitudinal velocities of Gaia EDR3 OB stars: 3D approach
Mróz, Przemek; Gedalin, Michael; Jiang, Ing-Guey +2 more
Distances and transverse along the Galactic longitude velocities vl of 2640 Gaia EDR3 O-B2 stars of Xu et al. within 2.5 kpc from the Sun and 250 pc from the Galactic plane with relative distance and velocity accuracies of <10 and <50 per cent are selected. Under the assumption of spiral density waves, both Galactic differential r…
Stellar Populations in type Ia supernova host galaxies at intermediate-high redshift: Star formation and metallicity enrichment histories
Galbany, L.; Mollá, M.; Gomes, J. M. +5 more
We present a summary of our project that studies galaxies hosting type Ia supernova (SN Ia) at different redshifts. We present Gran Telescopio de Canarias (GTC) optical spectroscopy of six SN Ia host galaxies at redshift z ~ 0.4-0.5. They are joined to a set of SN Ia host galaxies at intermediate-high redshift, which include galaxies from surveys …
Probing the parameters of the intergalactic medium using quasars
Morris, Simon L.; Fumagalli, Michele; Gatuzz, Efrain +1 more
We continue our series of papers on intergalactic medium (IGM) tracers using quasi-stellar objects (QSOs), having examined gamma-ray bursts (GRBs) and blazars in earlier studies. We have estimated the IGM properties of hydrogen column density ($\mathit {N}\small {\rm HXIGM}$), temperature, and metallicity using XMM-Newton QSO spectra over a large …