Search Publications
The CO-to-H2 Conversion Factor in the Barred Spiral Galaxy M83
Lee, Amanda M.; Koda, Jin; Hirota, Akihiko +2 more
We analyze the CO-to-H2 conversion factor (α CO) in the nearby barred spiral galaxy M83. We present new H I observations from the VLA and single-dish GBT in the disk of the galaxy, and combine them with maps of CO(1-0) integrated intensity and dust surface density from the literature. α CO and the gas-to-dust ratio…
Towards a complete picture of the Sco-Cen outflow
Alves, J.; Piecka, M.; Hutschenreuter, S.
Previous studies have presented strong evidence that the Sun is crossing an outflow originating from the Scorpius-Centaurus OB association (Sco-Cen). Understanding this outflow's origin and structure illuminates how massive star formation shapes the interstellar medium (ISM) and helps predict future Galactic conditions that will affect our Solar S…
Flare Hunting in Hot Subdwarf and White Dwarf Stars from Cycles 1–5 of TESS Photometry
Hermes, J. J.; Ma, Xiao-Yu; Zong, Weikai +9 more
Stellar flares are critical phenomena on stellar surfaces, which are closely tied to stellar magnetism. While extensively studied in main-sequence (MS) stars, their occurrence in evolved compact stars, specifically hot subdwarfs and white dwarfs (WDs), remains scarcely explored. Based on Cycles 1–5 of TESS photometry, we conducted a pioneering sur…
The Fourth S-PLUS Data Release: 12-filter photometry covering 3000 square degrees in the southern hemisphere
Werle, A.; Mendes de Oliveira, C.; Beers, T. C. +68 more
Context. The Southern Photometric Local Universe Survey (S-PLUS) is a project to map ~9300 sq deg of the sky using twelve bands (seven narrow and five broadbands). Observations are performed with the T80-South telescope, a robotic telescope located at the Cerro Tololo Observatory in Chile. The survey footprint consists of several large contiguous …
A Potential Second Shutoff from AT2018fyk: An Updated Orbital Ephemeris of the Surviving Star under the Repeating Partial Tidal Disruption Event Paradigm
Wevers, T.; Coughlin, E. R.; Hinkle, Jason T. +4 more
The tidal disruption event (TDE) AT2018fyk showed a rapid dimming event 500 days after discovery, followed by a rebrightening roughly 700 days later. It has been hypothesized that this behavior results from a repeating partial TDE (rpTDE), such that prompt dimmings/shutoffs are coincident with the return of the star to pericenter and rebrightening…
Weakly supervised anomaly detection in the Milky Way
Buckley, Matthew R.; Shih, David; Thanvantri, Sowmya +3 more
Large-scale astrophysics data sets present an opportunity for new machine learning techniques to identify regions of interest that might otherwise be overlooked by traditional searches. To this end, we demonstrate how Classification Without Labels (CWOLA), a weakly supervised anomaly detection method, can help identify cold stellar streams within …
The new Herschel/PACS Point Source Catalogue
Altieri, B.; Paladini, R.; Audard, M. +6 more
Context. Herschel operated as an observatory, and therefore it did not cover the whole sky, but still observed ~8% of it. The first version of an overall Herschel/PACS Point Source Catalogue (PSC) was released in 2017. The data are still unique and are very important for research using far-infrared information, especially because no new far-infrar…
The most variable VVV sources: eruptive protostars, dipping giants in the nuclear disc and others
Minniti, D.; Bayo, A.; Saito, R. K. +16 more
We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young stellar objects (YSOs) and detect unusual or new types of infrared variable source. We find 222 variable or transi…
An X-Ray and Radio View of the 2022 Reactivation of the Magnetar SGR J1935+2154
Campana, S.; Tiengo, A.; Götz, D. +19 more
Recently, the Galactic magnetar SGR J1935+2154 has garnered attention due to its emission of an extremely luminous radio burst, reminiscent of fast radio bursts (FRBs). SGR J1935+2154 is one of the most active magnetars, displaying flaring events nearly every year, including outbursts as well as short and intermediate bursts. Here, we present our …
Massive star formation in the hub-filament system of RCW 117
Ojha, D. K.; Vig, S.; Ghosh, S. K. +1 more
We present a multiwavelength investigation of the hub-filament system RCW 117 (IRAS 17059-4132), which shows intricate filamentary features in the far-infrared, mapped using Herschel images. We obtain the column density and dust temperature maps for the region using the Herschel images and identify 88 cores and 12 filaments from the column density…