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Predicting the Redshift of Gamma-Ray Loud AGNs Using Supervised Machine Learning. II
Poliszczuk, Artem; Pollo, Agnieszka; Liodakis, Ioannis +5 more
Measuring the redshift of active galactic nuclei (AGNs) requires the use of time-consuming and expensive spectroscopic analysis. However, obtaining redshift measurements of AGNs is crucial as it can enable AGN population studies, provide insight into the star formation rate, the luminosity function, and the density rate evolution. Hence, there is …
Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE
Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M. +3 more
Context. Physical and dynamical stellar properties are essential knowledge for understanding the structure, formation, and evolution of our Galaxy.
Aims: We produced a uniformly derived all-sky catalog of stellar astrophysical parameters (APs; age, mass, temperature, bolometric luminosity, distance, and dust extinction) to provide insight int…
A New Member of the Milky Way's Family Tree: Characterizing the Pontus Merger of Our Galaxy
Malhan, Khyati
We study the Pontus structure-a recently discovered merger that brought in ~7 globular clusters in the course of the hierarchical buildup of the Milky Way's halo. Here, we analyze the stellar population of Pontus and examine (1) its phase-space distribution using the ESA/Gaia data set, (2) its metallicity and chemical abundances (i.e., [Fe/H], [α/…
Limits on X-Ray Polarization at the Core of Centaurus A as Observed with the Imaging X-Ray Polarimetry Explorer
Wu, Kinwah; Enoto, Teruaki; Turolla, Roberto +96 more
We present measurements of the polarization of X-rays in the 2-8 keV band from the nucleus of the radio galaxy Centaurus A (Cen A), using a 100 ks observation from the Imaging X-ray Polarimetry Explorer (IXPE). Nearly simultaneous observations of Cen A were also taken with the Swift, NuSTAR, and INTEGRAL observatories. No statistically significant…
The Astrophysical Distance Scale. V. A 2% Distance to the Local Group Spiral M33 via the JAGB Method, Tip of the Red Giant Branch, and Leavitt Law
Rousseau-Nepton, Laurie; Madore, Barry F.; Freedman, Wendy L. +6 more
The J-region asymptotic giant branch (JAGB) method is a new standard candle that is based on the stable intrinsic J-band magnitude of color-selected carbon stars, and has a precision comparable to other primary distance indicators such as Cepheids and the TRGB. We further test the accuracy of the JAGB method in the Local Group galaxy M33. M33's mo…
A Fresh Look at AGB Stars in Galactic Open Clusters with Gaia: Impact on Stellar Models and the Initial-Final Mass Relation
Girardi, Léo; Cummings, Jeffrey D.; Marigo, Paola +7 more
Benefiting from the Gaia second and early third releases of photometric and astrometric data, we examine the population of asymptotic giant branch (AGB) stars that appear in the fields of intermediate-age and young open star clusters. We identify 49 AGB star candidates, brighter than the tip of the red giant branch, with a good to high cluster mem…
Probable dormant neutron star in a short-period binary system
Maoz, Dan; Latham, David W.; Liu, Jifeng +24 more
We have identified 2XMM J125556.57+565846.4, at a distance of 600 pc, as a binary system consisting of a normal star and a probable dormant neutron star. Optical spectra exhibit a slightly evolved F-type single star, displaying periodic Doppler shifts with a 2.76-d Keplerian circular orbit, with no indication of light from a secondary component. O…
First Detection of Transverse Vertical Oscillation during the Expansion of Coronal Loops
Li, Dong; Zhang, Qingmin; Li, Chuan +3 more
In this Letter, we perform a detailed analysis of the M5.5 class eruptive flare occurring in active region 12,929 on 2022 January 20. The eruption of a hot channel generates a fast coronal mass ejection (CME) and a dome-shaped extreme-ultraviolet (EUV) wave at speeds of 740-860 km s-1. The CME is associated with a type II radio burst, i…
Sensitivity to dark sector scales from gravitational wave signatures
Dent, James B.; Dutta, Bhaskar; Ghosh, Sumit +2 more
We consider gravitational sound wave signals produced by a first-order phase transition in a theory with a generic renormalizable thermal effective potential of power law form. We find the frequency and amplitude of the gravitational wave signal can be related in a straightforward manner to the parameters of the thermal effective potential. This l…
The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2
Zhang, Yapeng; Pattle, Kate; Karoly, Janik +157 more
We present and analyze observations of polarized dust emission at 850 µm toward the central 1 × 1 pc hub-filament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell Telescope (JCMT) as part of the B-fields in Star-forming Region Observations survey. The orientations of the magnetic field f…