Search Publications
Periodicity from X-ray sources within the inner Galactic disk
Hailey, Charles J.; Mori, Kaya; Morris, Mark R. +9 more
Aims: For many years it had been claimed that the Galactic ridge X-ray emission at the Galactic Center (GC) is truly diffuse in nature. However, with the advancement of modern X-ray satellites, it has been found that most of the diffuse emission actually comprises thousands of previously unresolved X-ray point sources. Furthermore, many studi…
Straight outta photosphere: Open solar flux without coronal modeling
Tähtinen, Ismo; Asikainen, Timo; Mursula, Kalevi
Context. The open solar flux, that is, the total magnetic flux escaping the Sun, is one of the most important parameters connecting solar activity to the Earth. The open solar flux is commonly estimated from photospheric magnetic field measurements by making model assumptions about the solar corona. However, the question in which way the open sola…
A comprehensive analysis towards the Fermi-LAT source 4FGL J1846.9-0227: jets of a protoplanetary nebula producing γ-rays?
Ortega, M. E.; Paron, S.; Petriella, A.
Most of the $\gamma$-ray sources in the Fermi-LAT 14-yr source catalogue are associated with pulsars and blazars. However, unveiling the nature of the still unassociated $\gamma$-ray sources is important for the understanding of high energy emission mechanisms in astrophysical objects. This work presents a comprehensive study towards the region co…
Relative Occurrence Rate between Hot and Cold Jupiters as an Indicator to Probe Planet Migration
Fulton, Benjamin J.; Gan, Tianjun; Mao, Shude +4 more
We propose a second-order statistic parameter ɛ, the relative occurrence rate between hot Jupiters (HJs) and cold Jupiters (CJs) (ɛ = η HJ/η CJ), to probe the migration of gas giants. Since the planet occurrence rate is the combined outcome of the formation and migration processes, a joint analysis of HJ and CJ frequency may …
Quasiperiodic Oscillations of Flare Loops and Slipping Motion of Ribbon Substructures during a C-class Flare
Li, Ting; Ye, Jing; Zhang, Yining
Quasiperiodic oscillations in solar-flaring emission have been observed over the past few decades. To date, the underpinning processes resulting in the quasiperiodic oscillations remain unknown. In this paper, we report a unique event that exhibits both the long-duration quasiperiodic intensity oscillations of flare loops and the quasiperiodic sli…
Deep Search for a Scattered Light Dust Halo Around Vega with the Hubble Space Telescope
Wolff, Schuyler G.; Wilner, David J.; Rieke, George H. +6 more
We present a provisory scattered-light detection of the Vega debris disk using deep Hubble Space Telescope (HST) coronagraphy (PID 16666). At only 7.7 pc, Vega is immensely important in debris disk studies both for its prominence and also because it allows the highest physical resolution among all debris systems relative to temperature zones aroun…
Magnetic Field Alignment Relative to Multiple Tracers in the High-mass Star-forming Region RCW 36
Fissel, Laura M.; Cunningham, Maria; Jones, Paul +9 more
We use polarization data from SOFIA HAWC+ to investigate the interplay between magnetic fields and stellar feedback in altering gas dynamics within the high-mass star-forming region RCW 36, located in Vela C. This region is of particular interest as it has a bipolar H II region powered by a massive star cluster, which may be impacting the surround…
Moving Groups in the Solar Neighborhood with Gaia, APOGEE, GALAH, and LAMOST: Dynamical Effects Gather Gas and the Ensuing Star Formation Plays an Important Role in Shaping the Stellar Velocity Distributions
Zhao, Jingkun; Yoon, Suk-Jin; Liang, Xilong
With Gaia, APOGEE, GALAH, and LAMOST data, we investigate the positional, kinematic, chemical, and age properties of nine moving groups in the solar neighborhood. We find that each moving group has a distinct distribution in the velocity space in terms of its metallicity, α abundance, and age. Comparison of the moving groups with their underlying …
Once in a blue stream. Detection of recent star formation in the NGC 7241 stellar stream with MEGARA
Leaman, Ryan; Erkal, Denis; Voggel, Karina T. +23 more
Aims: In this work we study the striking case of a narrow blue stream with a possible globular cluster-like progenitor around the NGC 7241 galaxy and its foreground dwarf companion. We want to figure out if the stream was generated by tidal interaction with NGC 7241 or if it first interacted with the foreground dwarf companion and later both …
Concerning SH0ES data: discrepant W0, VI absolute magnitudes for Cepheids in the keystone galaxy NGC4258
Majaess, Daniel
SH0ES VI-band photometry for classical Cepheids in the keystone galaxy NGC4258 yield discrepant absolute magnitudes. Specifically, the 2016 and 2022 published SH0ES Cepheid data for NGC4258 exhibit a substantial offset of ΔW0, VI ≃ 0m.3. That adds to a suite of existing concerns associated with the SH