Search Publications
Evolution of the Local Spiral Structure Revealed by OB-type Stars in Gaia DR3
Hao, C. J.; Hou, L. G.; Lin, Z. H. +5 more
The structure and evolution of the spiral arms of the Milky Way have long been an important yet controversial issue. The wide age range of OB-type stars, coupled with the large amount of high-precision astrometric data provided by Gaia DR3, presents us with an opportunity to explore this issue. After constructing overdensity maps and examining the…
Nature of 4FGL J1838.2+3223: A flaring 'spider' pulsar candidate
Zharikov, S. V.; Karpova, A. V.; Gilfanov, M. R. +4 more
An unidentified γ-ray source 4FGL J1838.2+3223 has been proposed as a pulsar candidate. We present optical time-series multiband photometry of its likely optical companion obtained with the 2.1-m telescope of Observatorio Astronómico Nacional San Pedro Mártir, Mexico. The observations and the data from the Zwicky Transient Facility revealed the so…
Survey of complex organic molecules in starless and pre-stellar cores in the Perseus molecular cloud
Shirley, Yancy; Jiménez-Serra, Izaskun; Scibelli, Samantha +1 more
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Reconnection Inside a Dipolarization Front of a Diverging Earthward Fast Flow
Escoubet, C. P.; Fazakerley, A. N.; Le Contel, O. +18 more
We examine a Dipolarization Front (DF) event with an embedded electron diffusion region (EDR), observed by the Magnetospheric Multiscale (MMS) spacecraft on 08 September 2018 at 14:51:30 UT in the Earth's magnetotail by applying multi-scale multipoint analysis methods. In order to study the large-scale context of this DF, we use conjunction observ…
Eruption of a Million-Kelvin Warm Magnetic Flux Rope on the Sun
Peter, Hardi; Li, Leping; Chitta, Lakshmi Pradeep +4 more
Solar magnetic flux rope (MFR) plays a central role in the physics of coronal mass ejections (CMEs). It mainly includes a cold filament at typical chromospheric temperatures (∼10,000 K) and a hot channel at high coronal temperatures (∼10 MK). The warm MFR at quiescent coronal temperatures of a million Kelvin is, however, rarely reported. In this s…
On the Scarcity of Dense Cores (n > 105 cm‑3) in High-latitude Planck Galactic Cold Clumps
Sanhueza, Patricio; Ward-Thompson, Derek; Whitworth, Anthony +34 more
High-latitude (∣b∣ > 30°) molecular clouds have virial parameters that exceed 1, but whether these clouds can form stars has not been studied systematically. Using JCMT SCUBA-2 archival data, we surveyed 70 fields that target high-latitude Planck Galactic cold clumps (HLPCs) to find dense cores with density of 105–106 cm
The red giant branch tip in the SDSS, PS1, JWST, NGRST, and Euclid photometric systems: Calibration in optical passbands using Gaia DR3 synthetic photometry
Bellazzini, M.; Pascale, R.
We used synthetic photometry from Gaia DR3 BP and RP spectra for a large selected sample of stars in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) to derive the magnitude of the red giant branch (RGB) tip for these two galaxies in several passbands across a range of widely used optical photometric systems, including those of sp…
Eruptive events with exceptionally bright emission in H I Ly-α observed by the Metis coronagraph
Heinzel, P.; Jejčič, S.; Sasso, C. +29 more
Context. Ultraviolet (UV) emission from coronal mass ejections can provide information on the evolution of plasma dynamics, temperature, and elemental composition, as demonstrated by the UV Coronagraph Spectrometer (UVCS) on board the SOlar and Heliospheric Observatory (SOHO). Metis, the coronagraph on board Solar Orbiter, provides for the first t…
VLBI position variability of AGNs is inversely correlated with their photometric variability
Lambert, S.; Secrest, N. J.
Aims: The stability of the International Celestial Reference Frame (ICRF), realized through geodetic very long baseline interferometry (VLBI) positions of thousands of extragalactic objects, is dependent on the individual positional stability of these objects. It has been recently shown that the prevalence of offsets between the VLBI position…
Violation of the equivalence principle induced by oscillating rest mass and transition frequency, and its detection in atom interferometers
Wolf, Peter; Gué, Jordan; Hees, Aurélien
We present a theoretical investigation of the expected experimental signals produced by freely falling atoms with time oscillating mass and transition frequency. These oscillations could be produced in a variety of models, in particular, models of scalar dark matter nonuniversally coupled to the standard matter such as axionlike particles and dila…