Search Publications
Investigating the nature of the ultraluminous X-ray sources in the galaxy NGC 925
Salvaterra, R.; Wolter, A.; Belfiore, A. +7 more
Variability is a powerful tool to investigate properties of X-ray binaries (XRB), in particular for Ultraluminous X-ray sources (ULXs) that are mainly detected in the X-ray band. For most ULXs the nature of the accretor is unknown, although a few ULXs have been confirmed to be accreting at super-Eddington rates on to a neutron star (NS). Monitorin…
NOEMA observations support a recoiling black hole in 3C 186
Capetti, A.; Castignani, G.; Combes, F. +7 more
3C 186 is a powerful radio-loud quasar (a quasi-stellar object) at the center of a cool-core cluster at z = 1.06. Previous studies have reported evidence for a projected spatial offset of ∼1″ between the isophotal center of the galaxy and the point-source quasi-stellar object (QSO) as well as a spectral shift of ∼2000 km s−1 between the…
Molecules in the Carbon-rich Protoplanetary Nebula CRL 2688
Zhang, Yong; Zhang, Jiang-Shui; Nakashima, Jun-ichi +1 more
We present observations of the carbon-rich protoplanetary nebula CRL 2688 made with the Institut de Radioastronomie Millimétrique 30 m telescope in the 3 and 2 mm bands. In total, 196 transition lines belonging to 38 molecular species and isotopologues are detected, among which, to the best of our knowledge, 153 transition lines and 13 species are…
The TELPERION survey for distant [O III] clouds around luminous and hibernating AGN
Keel, William C.; Eselevich, M. V.; Smirnova, A. A. +5 more
We present a narrow-band [O III] imaging survey of 111 active galactic nucleus (AGN) hosts and 17 merging-galaxy systems, in search of distant extended emission-line regions (EELRs) around AGNs (either extant or faded). Our data reach deeper than detection from the broad-band SDSS data and cover a wider field than some early emission-line surveys …
Ultraviolet Spectroscopy and TARDIS Models of the Broad-lined Type Ic Supernova 2014ad
Foley, Ryan J.; Modjaz, Maryam; Garnavich, Peter +11 more
Few published ultraviolet (UV) spectra exist for stripped-envelope supernovae and none to date for broad-lined Type Ic supernovae (SNe Ic-bl). These objects have extremely high ejecta velocities and are the only supernova type directly linked to gamma-ray bursts (GRBs). Here we present two epochs of HST/STIS spectra of the SN Ic-bl 2014ad, the fir…
New photometry of 12 ultrashort-period late-type binary stars
Koen, C.
Candidate late-type binary stars were selected on the basis of their red g - i and r - z colours, and short (0.1159-0.2059 d) published periods. At least one cycle of variation of each star was observed in the RC and IC bands. For the five brightest stars, observations were also obtained in V. Typically ~17 standardized photo…
Near-Earth Interplanetary Coronal Mass Ejections and Their Association with DH Type II Radio Bursts During Solar Cycles 23 and 24
Joshi, Bhuwan; Moon, Yong-Jae; Cho, Kyung-Suk +2 more
We analyse the characteristics of interplanetary coronal mass ejections (ICMEs) during Solar Cycles 23 and 24. The present analysis is primarily based on the near-Earth ICME catalogue (Richardson and Cane, 2010). An important aspect of this study is to understand the near-Earth and geoeffective aspects of ICMEs in terms of their association (type …
Mid-infrared imaging of Supernova 1987A
Matsuura, Mikako; Barlow, M. J.; Meixner, Margaret +9 more
At a distance of 50 kpc, Supernova 1987A is an ideal target to study how a young supernova (SN) evolves in time. Its equatorial ring, filled with material expelled from the progenitor star about 20 000 yr ago, has been engulfed with SN blast waves. Shocks heat dust grains in the ring, emitting their energy at mid-infrared (IR) wavelengths We prese…
Interplay between Young Stars and Molecular Clouds in the Ophiuchus Star-forming Complex
Chen, Wen-Ping; Gupta, Aashish
We present spatial and kinematic correlation between the young stellar population and the cloud clumps in the Ophiuchus star-forming region. The stellar sample consists of known young objects at various evolutionary stages, taken from the literature, some of which are diagnosed with Gaia EDR3 parallax and proper-motion measurements. The molecular …
A Comparison of Solar X-Ray Flare Timescales and Peak Temperatures with Associated Coronal Mass Ejections
Kahler, S. W.; Ling, A. G.
Recent work has shown that plots of solar flare X-ray peak temperatures, Tm, versus log peak fluxes, Fp, show statistically significant separations of lower Tm flares with fast (Vcme ≥ 1000 km s-1) and wide (Wcme = 360°) strong coronal mass ejections (CMEs) from higher Tm flares with no CMEs or slow (Vcme < 1000 km s-1) or…