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Was There a 3.5 keV Line?
Safdi, Benjamin R.; Foster, Joshua W.; Dessert, Christopher +1 more
The 3.5 keV line is a purported emission line observed in galaxies, galaxy clusters, and the Milky Way whose origin is inconsistent with known atomic transitions and has previously been suggested to arise from dark matter decay. We systematically reexamine the bulk of the evidence for the 3.5 keV line, attempting to reproduce six previous analyses…
A JWST/MIRI and NIRCam Analysis of the Young Stellar Object Population in the Spitzer I Region of NGC 6822
Temim, Tea; Hirschauer, Alec S.; Boyer, Martha L. +8 more
We present an imaging survey of the Spitzer I star-forming region in NGC 6822 conducted with the NIRCam and MIRI instruments on board JWST. Located at a distance of 490 kpc, NGC 6822 is the nearest non-interacting low-metallicity (∼0.2 Z ⊙) dwarf galaxy. It hosts some of the brightest known H II regions in the local universe, including …
Witnessing an extreme, highly efficient galaxy formation mode with resolved Lyman-α and Lyman-continuum emission
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +9 more
J1316+2614 at z = 3.613 is the UV-brightest (MUV = ‑24.7) and strongest Lyman continuum-emitting (fescLyC ≈ 90%) star-forming galaxy known; it also shows signatures of inflowing gas from its blue-dominated Lyα profile. We present high-resolution imaging with the Hubble Space Telescope (HST) and the Very Large Teles…
Narrow-line Seyfert 1 galaxies in Sloan Digital Sky Survey: a new optical spectroscopic catalogue
Stalin, C. S.; Saikia, D. J.; Domínguez, Alberto +1 more
Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active galactic nuclei (AGN) that exhibit peculiar multiwavelength properties across the electromagnetic spectrum. For example, these sources have allowed us to explore the innermost regions of the central engine of AGN using X-ray observations and have also provided clues about the …
Galactic 'Snake' IRDC G11.11-0.12: a site of multiple hub-filament systems and colliding filamentary clouds
Dewangan, L. K.; Sharma, Saurabh; Eswaraiah, C. +3 more
To probe star formation processes, we present a multiscale and multiwavelength investigation of the 'Snake' nebula/infrared dark cloud G11.11-0.12 (hereafter, G11; length ~27 pc). Spitzer images hint at the presence of subfilaments (in absorption), and reveal four infrared-dark hub-filament system (HFS) candidates (extent < 6 pc) towards G11, w…
[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE
Laporte, Chervin F. P.; Price-Whelan, Adrian M.; Horta, Danny +4 more
Chemical cartography of the Galactic disk provides insights into its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk with giant stars from Apache Point Observatory Galactic Evolution Experiment (APOGEE) DR17. We confirm the exi…
A Two-Component Probability Distribution Function Describes the Mid-IR Emission from the Disks of Star-forming Galaxies
Sandstrom, Karin M.; Ramambason, Lise; Leroy, Adam K. +28 more
High-resolution JWST-MIRI images of nearby spiral galaxies reveal emission with complex substructures that trace dust heated both by massive young stars and the diffuse interstellar radiation field. We present high angular (0.″85) and physical resolution (20-80 pc) measurements of the probability distribution function (PDF) of mid-infrared (mid-IR…
Global Parameters of Eight W UMa-type Binary Systems
Poro, Atila; Paki, Ehsan; Michel, Raul +1 more
Multiband photometric investigations for eight binary systems of the W Ursae Majoris-type are presented. Six systems are presented for the first time to analyze their light curves. All the analyzed systems have a temperature below 5000 K and an orbital period of less than 0.28 days. We extracted primary and secondary minima from the ground-based o…
IXPE observation of PKS 2155–304 reveals the most highly polarized blazar
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +133 more
We report the X-ray polarization properties of the high-synchrotron-peaked (HSP) blazar PKS 2155‑304 based on observations with the Imaging X-ray Polarimetry Explorer (IXPE). We observed the source between Oct 27 and Nov 7, 2023. We also conducted an extensive contemporaneous multiwavelength (MW) campaign. We find that during the first half (T
Robust constraints on feebly interacting particles using XMM-Newton
Carenza, Pierluca; Balaji, Shyam; Luque, Pedro De la Torre
During galactic supernova (SN) explosions, a large amount of feebly interacting particles (FIPs) may be produced. In this work we analyze electrophilic FIPs with masses in the MeV-range that escape from SN and decay into electron-positron pairs, causing an exotic leptonic injection. This contribution adds up to known components, leading to an unex…