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A Broadband Look at the Old and New ULXs of NGC 6946
Fürst, Felix; Walton, Dominic J.; Stern, Daniel +8 more
Two recent observations of the nearby galaxy NGC 6946 with NuSTAR, one simultaneous with an XMM-Newton observation, provide an opportunity to examine its population of bright accreting sources from a broadband perspective. We study the three known ultraluminous X-ray sources (ULXs) in the galaxy, and find that ULX-1 and ULX-2 have very steep power…
Isochrone-cloud fitting of the extended main-sequence turn-off of young clusters
Bastian, N.; Aerts, C.; Johnston, C. +1 more
Context. Extended main-sequence turn-offs (eMSTOs) are a commonly observed property of young clusters. A global theoretical interpretation for eMSTOs is still lacking, but stellar rotation is considered a necessary ingredient to explain eMSTOs.
Aims: We aim to assess the importance of core-boundary and envelope mixing in stellar interiors for…
VLT/SPHERE Multiwavelength High-contrast Imaging of the HD 115600 Debris Disk: New Constraints on the Dust Geometry and the Presence of Young Giant Planets
Currie, Thayne; Wagner, Kevin; Moór, Attila +5 more
Young and dynamically active planetary systems can form disks of debris that are easier to image than the planets themselves. The morphology and evolution of these disks can help to infer the properties of the putative planets responsible for generating and shaping the debris structures. We present integral field spectroscopy and dual-band imaging…
Testing the Kerr Metric with X-Ray Reflection Spectroscopy of Mrk 335 Suzaku Data
Abdikamalov, Askar B.; Ayzenberg, Dimitry; Bambi, Cosimo +4 more
Einstein’s gravity has undergone extensive tests in the weak field gravitational limit, with results in agreement with theoretical predictions. There exist theories beyond general relativity (GR) which modify gravity in the strong field regime but agree with GR in the weak field. Astrophysical black holes are believed to be described by the Kerr m…
Statistics on the Magnetosheath Properties Related to Magnetopause Magnetic Reconnection
Zhang, Hui; Liu, Libo; Wan, Weixing +5 more
Magnetosheath properties, particularly those related to magnetopause magnetic reconnection (MR), are investigated in this study. (1) Asymmetries are found to exist in the distributions of plasma and magnetic field parameters in the magnetosheath. These asymmetries are related to the interplanetary magnetic field (IMF) orientation, and they are pro…
Searching for Black Hole Candidates by LAMOST and ASAS-SN
Liu, Jifeng; Bai, Yu; Gu, Wei-Min +13 more
Most dynamically confirmed stellar-mass black holes (BHs) and their candidates were originally selected from X-ray outbursts. In the present work, we search for BH candidates in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey using the spectra along with photometry from the All Sky Automated Survey for SuperNovae (ASA…
Extended X-Ray Study of M49: The Frontier of the Virgo Cluster
Mernier, F.; Churazov, E.; Maccarone, T. J. +10 more
The M49 group, residing outside the virial radius of the Virgo cluster, is falling onto the cluster from the south. We report results from deep XMM-Newton mosaic observations of M49. Its hot gas temperature is 0.8 keV at the group center and rises to 1.5 keV beyond the brightest group galaxy (BGG). The group gas extends to radii of ∼300 kpc to the…
The Herschel-PACS North Ecliptic Pole Survey
Goto, Tomotsugu; Kim, Seong Jin; Pearson, Chris +9 more
A detailed analysis of Herschel/Photoconductor Array Camera and Spectrometer (PACS) observations at the North Ecliptic Pole is presented. High-quality maps, covering an area of 0.44 deg2, are produced and then used to derive potential candidate source lists. A rigorous quality-control pipeline has been used to create final legacy catalo…
The complex evolution of the X-ray binary transient MAXI J1807+132 along the decay of its discovery outburst
Russell, D. M.; Armas Padilla, M.; Jiménez-Ibarra, F. +6 more
MAXI J1807+132 is an X-ray transient discovered during the decay of an outburst in 2017. We present optical and X-ray monitoring of the source over more than 125 d, from outburst to quiescence. The outburst decay is characterized by the presence of several reflares with a quasi-periodic recurrence time of ∼6.5 d. We detect broad H and He emission …
Wide-area photometric and astrometric (Gaia DR2) study of the young cluster NGC 6530
Micela, G.; Sciortino, S.; Prisinzano, L. +1 more
Context. NGC 6530 is a young cluster, with a complex morphology and star-formation history. We present a statistical study of its global properties, using a new, large list of candidate members down to masses of 0.2-0.4 M⊙ and Gaia DR2 astrometry.
Aims: We consider a larger sky region compared to previous studies, to investigate th…