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Propagation of the Interplanetary Shock Induced Pulse: New Observations by the Global Navigation Satellite System
Zong, Qiugang; Zhang, Hui; Chen, Xingran +3 more
We revisited a typical interplanetary (IP) shock event on 7 November 2004, with high time resolution (1 s) total electron content (TEC) observations. The IP shock impinged on the dayside magnetopause at ∼18:27 UT, and launched a pulse into the magnetosphere. Using the multi-spacecraft timing method, the pulse was estimated to propagate at an angul…
A search for Kuiper belt occultations using the Weizmann Fast Astronomical Survey Telescope
Ofek, Eran O.; Polishook, David; Nir, Guy +2 more
Measuring the size distribution of small (kilometre-scale) Kuiper belt objects (KBOs) can help constrain models of Solar system formation and planetary migration. Such small, distant bodies are hard to detect with current or planned telescopes, but can be identified as sub-second occultations of background stars. We present the analysis of data fr…
Quasiperiodic Variations of Coronal Mass Ejections with Different Angular Widths
Mei, Ying; Wang, Feng; Deng, Hui +2 more
Coronal mass ejections (CMEs) are energetic expulsions of organized magnetic features from the Sun. The study of CME quasiperiodicity helps establish a possible relationship between CMEs, solar flares, and geomagnetic disturbances. We used the angular width of CMEs as a criterion for classifying the CMEs in the study. Based on 25 yr of observation…
Detections of [C II] 158 µm and [O III] 88 µm in a Local Lyman Continuum Emitter, Mrk 54, and Its Implications to High-redshift ALMA Studies
Hayes, Matthew; Inoue, Akio K.; Hashimoto, Takuya +17 more
We present integral field, far-infrared (FIR) spectroscopy of Mrk 54, a local Lyman continuum emitter, obtained with FIFI-LS on the Stratospheric Observatory for Infrared Astronomy. This is only the second time, after Haro 11, that [C II] 158 µm and [O III] 88 µm spectroscopy of the known LCEs have been obtained. We find that Mrk 54 ha…
Disentangling Stellar and Airglow Emission Lines from Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) Spectra
France, Kevin; Youngblood, Allison; Bourrier, Vincent +1 more
H I Lyα (1215.67 Å) and the O I triplet (1302.17, 1304.86, and 1306.03 Å) are bright far-ultraviolet (FUV) emission lines that trace the stellar chromosphere. Observations of stellar Lyα and O I using the Hubble Space Telescope's (HST) most sensitive FUV spectrograph, the Cosmic Origins Spectrograph (COS), are contaminated with geocoronal emission…
Surveying the Giant H II Regions of the Milky Way with SOFIA: V. DR7 and K3-50
Lim, Wanggi; De Buizer, James M.; Radomski, James T. +1 more
We present our fifth set of results from our mid-infrared imaging survey of Milky Way Giant H II (GH II) regions with our detailed analysis of DR7 and K3-50. We obtained 20/25 and 37 µm imaging maps of both regions using the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy. We investigate the multiscale properties o…
X-ray flashes from the low-mass X-ray binary IGR J17407−2808
Santangelo, A.; Ducci, L.; Romano, P. +4 more
IGR J17407−2808 is an enigmatic and poorly studied X-ray binary that was recently observed quasi-simultaneously with NuSTAR and XMM-Newton. In this paper we report the results of this observational campaign. During the first 60 ks of observation, the source was caught in a relatively low emission state characterised by a modest variability and an …
Water production rates from SOHO/SWAN observations of comets C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS)
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +2 more
In 2021 and 2022 the hydrogen comae of three long period comets, C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS) were observed with the Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the SOlar and Heliosphere Observer (SOHO) satellite. SWAN obtains nearly daily full-sky images of the hydrogen Lyman-α distr…
Star formation in the centre of NGC 1808 as observed by ALMA
Chen, Guangwen; Kong, Xu; Bendo, George J. +2 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 85.69- and 99.02-GHz continuum emission and H42α and H40α lines emission from the central 1 kpc of NGC 1808. These forms of emission are tracers of photoionizing stars but unaffected by dust obscuration that we use to test the applicability of other commonly star format…
Luminosity Outburst of a High-mass Young Stellar Object Triggered by the Surrounding Radiation Field
Liu, Jun-Ting; Chen, Xi; Li, Bin +8 more
We present observations of the 6.7 GHz methanol and 4.8 GHz formaldehyde masers toward the high-mass young stellar object G24.33+0.14 (hereafter G24). Our observations were conducted from 2019 to 2021 using the Shanghai Tianma 65 m Radio Telescope and the Very Large Array in response to the luminosity outburst event traced by these two species mas…