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Reanalysis of the MACHO Constraints on PBH in the Light of Gaia DR3 Data
García-Bellido, Juan; Hawkins, Michael
The recent astrometric data of hundreds of millions of stars from Gaia DR3 has allowed for a precise determination of the Milky Way rotation curve up to 28 kpc. The data suggest a rapid decline in the density of dark matter beyond 19 kpc. We fit the whole rotation curve with four components (gas, disk, bulge, and halo), and compute the microlensin…
G321.3–3.9: A new supernova remnant observed with multi-band radio data and in the SRG/eROSITA All-Sky Surveys
Nicastro, L.; Becker, W.; Hurley-Walker, N. +3 more
Aims. G321.3–3.9 was first identified as a partial shell at radio frequencies a few decades ago. Although it continued to be observed, no additional studies were undertaken until recently. Methods. In this paper, we present results from a large selection of radio and X-ray data that cover the position of G321.3–3.9. We confirmed G321.3–3.9 as a ne…
The positional probability and true host star identification of TESS exoplanet candidates
Armstrong, David J.; Hadjigeorghiou, Andreas
We present a method for deriving a probabilistic estimate of the true source of a detected TESS transiting event. Our method relies on comparing the observed photometric centroid offset for the target star with models of the offset that would occur if the event was either on the target or any of the Gaia identified nearby sources. The comparison i…
Understanding the star formation efficiency in dense gas: Initial results from the CAFFEINE survey with ArTéMiS
Roussel, H.; André, Ph.; Arzoumanian, D. +9 more
Context. Despite recent progress, the question of what regulates the star formation efficiency (SFE) in galaxies remains one of the most debated problems in astrophysics. According to the dominant picture, star formation (SF) is regulated by turbulence and feedback, and the SFE is ~1-2% or less per local free-fall time on all scales from Galactic …
Small-scale magnetic flux emergence preceding a chain of energetic solar atmospheric events
Rouppe van der Voort, L. H. M.; Joshi, R.; Froment, C. +4 more
Context. Advancements in instrumentation have revealed a multitude of small-scale extreme-ultraviolet (EUV) events in the solar atmosphere and considerable effort is currently undergoing to unravel them.
Aims: Our aim is to employ high-resolution and high-sensitivity magnetograms to gain a detailed understanding of the magnetic origin of such…
Radio Jet Feedback on the Inner Disk of Virgo Spiral Galaxy Messier 58
Togi, Aditya; Rich, R. Michael; Román, Javier +9 more
Spitzer spectral maps reveal a disk of highly luminous, warm (>150 K) H2 in the center of the massive spiral galaxy Messier 58, which hosts a radio-loud active galactic nucleus (AGN). The inner 2.6 kpc of the galaxy appears to be overrun by shocks from the radio jet cocoon. Gemini NIRI imaging of the H2 1–0 S(1) emission l…
NOEMA formIng Cluster survEy (NICE): Characterizing eight massive galaxy groups at 1.5 < z < 4 in the COSMOS field
Daddi, Emanuele; Schinnerer, Eva; Cai, Zheng +41 more
The NOrthern Extended Millimeter Array (NOEMA) formIng Cluster survEy (NICE) is a NOEMA large programme targeting 69 massive galaxy group candidates at z > 2 over six deep fields with a total area of 46 deg2. Here we report the spectroscopic confirmation of eight massive galaxy groups at redshifts 1.65 ≤ z ≤ 3.61 in the Cosmic Evolut…
SED Analysis of the Old Open Cluster NGC 188
Çınar, Deniz Cennet; Tasdemir, Seval; Koc, Seliz +1 more
In this study, we investigate the fundamental astrophysical parameters of the old open cluster NGC 188 using two complementary methods: isochron fitting and spectral energy distribution (SED) analysis. Using photometric, astrometric, and spectroscopic data from the {\it Gaia} Data Release 3 \citep[DR3,][]{Gaia_DR3}, we identified 868 most likely m…
The first measurements of carbon isotopic ratios in post-RGB stars: SZ Mon and DF Cyg
Ventura, Paolo; Masseron, Thomas; Van Winckel, Hans +4 more
Dusty post-red giant branch (post-RGB) stars are low- and intermediate-mass stars where the RGB evolution was prematurely terminated by a poorly understood binary interaction. These binary stars are considered to be low-luminosity analogues of post-asymptotic giant branch (post-AGB) binary stars. In this study, we investigated the chemical composi…
Coronal Holes, Footpoint Reconnection, and the Origin of the Slow (and Fast) Solar Wind
Wang, Y. -M.
The tendency for low-speed solar wind to show greater spatiotemporal variability and different compositional properties from high-speed wind has led to the prevailing idea of a bimodal solar wind, in which fast wind comes from coronal holes and slow wind comes from coronal streamers. We present observational evidence that most of the slow wind ori…