Search Publications
Tracing the Milky Way's Vestigial Nuclear Jet
Bland-Hawthorn, Joss; Mukherjee, Dipanjan; Wagner, Alexander Y. +2 more
MeerKAT radio continuum and XMM-Newton X-ray images have recently revealed a spectacular bipolar channel at the Galactic Center that spans several degrees (~0.5 kpc). An intermittent jet likely formed this channel and is consistent with earlier evidence of a sustained, Seyfert-level outburst fueled by black hole accretion onto Sgr A* several Myr a…
Searching for new solar twins: The Inti survey for the Northern Sky
Meléndez, Jorge; Reggiani, Henrique; Schlaufman, Kevin C. +9 more
Solar twins are key in different areas of astrophysics, however only just over a hundred were identified and well-studied in the last two decades. In this work, we take advantage of the very precise Gaia (DR2/EDR3), Tycho, and 2MASS photometric systems to create the ${{Inti}}$ survey of new solar twins in the Northern Hemisphere. The spectra of ou…
Calibrating X-Ray Binary Luminosity Functions via Optical Reconnaissance. I. The Case of M83
Chandar, Rupali; Mok, Angus; Gallo, Elena +4 more
Building on recent work by Chandar et al., we construct X-ray luminosity functions (XLFs) for different classes of X-ray binary (XRB) donors in the nearby star-forming galaxy M83 through a novel methodology. Rather than classifying low- versus high-mass XRBs based on the scaling of the number of X-ray sources with stellar mass and star formation r…
Structure and dynamics of the inner nebula around the symbiotic stellar system R Aquarii
Alcolea, J.; Santander-García, M.; Bujarrabal, V. +5 more
Aims: We investigate the structure, dynamics, and chemistry of the molecule-rich nebula around the stellar symbiotic system R Aqr, which is significantly affected by the presence of a white dwarf (WD) companion. We study the effects of the strong dynamical interaction between the AGB wind and the WD and of photodissociation by the WD UV radia…
StrayCats: A Catalog of NuSTAR Stray Light Observations
Hare, Jeremy; García, Javier A.; Madsen, Kristin K. +10 more
We present StrayCats, a catalog of NuSTAR stray light observations of X-ray sources. Stray light observations arise for sources 1°-4° away from the telescope pointing direction. At this off-axis angle, X-rays pass through a gap between the optics and aperture stop and so do not interact with the X-ray optics; instead, they directly illuminate the …
Statistical analysis of soft X-ray solar flares during solar cycles 22, 23, and 24
Xiong, Bo; Li, Xiaolin; Wang, Ting +1 more
This paper presents a statistical analysis of soft X-ray flares during the period January 1986 to June 2017 covering the last three solar cycles (SCs) 22, 23, and 24. We have analyzed the distribution of flare number, the relationship between the occurrence rate of soft X-ray flares and solar activity, and the duration of different intensity class…
The JCMT BISTRO Survey: Evidence for Pinched Magnetic Fields in Quiescent Filaments of NGC 1333
Pattle, Kate; Ward-Thompson, Derek; Bastien, Pierre +33 more
We investigate the internal 3D magnetic structure of dense interstellar filaments within NGC 1333 using polarization data at 850 µm from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope. Theoretical models predict that the magnetic field lines in a filament will tend to be dragged radially inward (…
Formation of an ultra-diffuse galaxy in the stellar filaments of NGC 3314A: Caught in the act?
Rampazzo, Roberto; Forbes, Duncan A.; Mieske, Steffen +13 more
The VEGAS imaging survey of the Hydra I cluster has revealed an extended network of stellar filaments to the south-west of the spiral galaxy NGC 3314A. Within these filaments, at a projected distance of ∼40 kpc from the galaxy, we discover an ultra-diffuse galaxy (UDG) with a central surface brightness of µ0, g ∼ 26 mag arcsec
The List of Possible Double and Multiple Open Clusters between Galactic Longitudes 240° and 270°
Casado, J.
Abstract—This work studies the candidate double and multiple open clusters (OCs) in the galactic sector from l = 240° to l = 270°, which contains the Vela-Puppis star formation region. To do that, we have searched the most recent and complete catalogues of OCs by hand to get an extensive list of 22 groups of OCs involving 80 candidate members. Gai…
Constraining the Konoplya-Rezzolla-Zhidenko deformation parameters. II. Limits from stellar-mass black hole x-ray data
Yu, Zhibo; Tripathi, Ashutosh; Abdikamalov, Askar B. +5 more
Astrophysical black holes are thought to be the Kerr black holes predicted by general relativity, but macroscopic deviations from the Kerr solution can be expected from a number of scenarios involving new physics. In Paper I, we studied the reflection features in NuSTAR and XMM-Newton spectra of the supermassive black hole at the center of the gal…