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Solar Orbiter and SDO Observations, and a Bifrost Magnetohydrodynamic Simulation of Small-scale Coronal Jets
Tiwari, Sanjiv K.; Cheung, Mark C. M.; Berghmans, David +3 more
We report high-resolution, high-cadence observations of five small-scale coronal jets in an on-disk quiet Sun region observed with Solar Orbiter's EUI/HRIEUV in 174 Å. We combine the HRIEUV images with the EUV images of SDO/AIA and investigate the magnetic setting of the jets using coaligned line-of-sight magnetograms from SD…
The SCUBA-2 Cosmology Legacy Survey: the EGS deep field - III. The evolution of faint submillimetre galaxies at z < 4
Faber, S. M.; Aretxaga, I.; Montaña, A. +2 more
We present a demographic analysis of the physical and morphological properties of $450/850~\mu \rm m$-selected galaxies from the deep observations of the SCUBA-2 Cosmology Legacy Survey in the Extended Groth Strip that are detected below the classical submillimetre-galaxy regime ($S_{850\, \mu \rm m}\lesssim 6~\rm mJy$ beam-1) and compa…
Similar levels of deuteration in the pre-stellar core L1544 and the protostellar core HH211
Caselli, P.; Spezzano, S.; Lique, F. +6 more
Context. In the centre of pre-stellar cores, deuterium fractionation is enhanced due to low temperatures and high densities. Therefore, the chemistry of deuterated molecules can be used to probe the evolution and the kinematics in the earliest stages of star formation.
Aims: We analyse the deuterium fractionation of simple molecules, comparin…
Properties of the dense cores and filamentary structures in the Vela C molecular cloud
Zhang, Guo-Yin; Zhang, Chang; Li, Jin-Zeng +3 more
The initial and boundary conditions of the Galactic star formation in molecular clouds are not well understood. In an effort to shed new light on this long-standing problem, we measured the properties of dense cores and filamentary structures in the Vela C molecular cloud, observed with Herschel. We used the hires algorithm to create high-resoluti…
The Hubble/STIS near-ultraviolet transmission spectrum of HD 189733 b
France, K.; Fossati, L.; Cubillos, P. E. +5 more
The benchmark hot Jupiter HD 189733 b has been a key target, used to lay out the foundations of comparative planetology for giant exo-planets. As such, HD 189733 b has been extensively studied across the electromagnetic spectrum. Here we report the observation and analysis of three transit light curves of HD 189733 b obtained with Hubble/STIS in t…
PEARLS: JWST Counterparts of Microjansky Radio Sources in the Time Domain Field
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +38 more
The Time Domain Field (TDF) near the North Ecliptic Pole in JWST's continuous-viewing zone will become a premier "blank field" for extragalactic science. JWST/NIRCam data in a 16 arcmin2 portion of the TDF identify 4.4 µm counterparts for 62 of 63 3 GHz sources with S(3 GHz) > 5 µJy. The one unidentified radio source may …
New Insights in the Bubble Wall of NGC 3324: Intertwined Substructures and a Bipolar Morphology Uncovered by JWST
Dewangan, L. K.; Sharma, Saurabh; Mayya, Y. D. +4 more
We report the discovery of intertwined/entangled substructures toward the bubble wall of NGC 3324 below a physical scale of 4500 au, which is the sharp edge/ionization front/elongated structure traced at the interface between the H II region and the molecular cloud. The sharp edge appears wavy in the Spitzer 3.6-8.0 µm images (resolution ~2″…
The Classification of Galaxy Morphology in the H Band of the COSMOS-DASH Field: A Combination-based Machine-learning Clustering Model
Fang, Guanwen; Lin, Zesen; Kong, Xu +6 more
By applying our previously developed two-step scheme for galaxy morphology classification, we present a catalog of galaxy morphology for H-band-selected massive galaxies in the COSMOS-DASH field, which includes 17,292 galaxies with stellar mass M ⋆ > 1010 M ⊙ at 0.5 < z < 2.5. The classification scheme is …
Search for X-Ray Quasiperiodicity of Six AGNs Using the Gaussian Process Method
Zhang, Haoyang; Yang, Shenbang; Dai, Benzhong
The quasiperiodic oscillations (QPOs) found in active galactic nuclei (AGNs) are a very interesting observational phenomenon implying an unknown physical mechanism around supermassive black holes. Several AGNs have been found to have QPO phenomena in the X-ray energy band. Long-duration X-ray observations were collected and reduced for six AGNs wi…
Molecules in the peculiar age-defying source IRAS 19312+1950
Zhang, Yong; Zhang, Jiang-Shui; Nakashima, Jun-ichi +5 more
Context. IRAS 19312+1950 is an isolated infrared source that exhibits a characteristic quasi-point-symmetric morphology in the near-and mid-infrared images and is also very bright in molecular radio lines. Because of its unique observational characteristics, various observational studies have been conducted and several hypotheses have been propose…