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On the Sun's distance from the center and the shape of the inner halo in the Galaxy: Gaia EDR3, HST and literature globular clusters
Gedalin, Michael; Jiang, Ing-Guey; Griv, Evgeny
A statistical method is used to derive both the Sun's distance r0 from the Galactic Center (GC) and the 3D geometry of the inner (< 25 kpc) halo. The spatial distribution of the 138 Gaia EDR3 globular clusters (GCs) with distances established on a combination of HST and literature data of Baumgardt and Vasiliev (2021) is explored. An…
J-PLUS: Discovery and characterisation of ultracool dwarfs using Virtual Observatory tools. II. Second data release and machine learning methodology
Hernández-Monteagudo, C.; Caballero, J. A.; Martín, E. L. +20 more
Context. Ultracool dwarfs (UCDs) comprise the lowest mass members of the stellar population and brown dwarfs, from M7 V to cooler objects with L, T, and Y spectral types. Most of them have been discovered using wide-field imaging surveys, for which the Virtual Observatory (VO) has proven to be of great utility.
Aims: We aim to perform a searc…
Spectroscopic Mapping of Io's Surface with HST/STIS: SO2 Frost, Sulfur Allotropes, and Large-scale Compositional Patterns
Brown, Michael E.; Trumbo, Samantha K.; Davis, M. Ryleigh +1 more
Io's intense volcanic activity results in one of the most colorful surfaces in the solar system. Ultraviolet and visible-wavelength observations of Io are critical to uncovering the chemistry behind its volcanic hues. Here, we present global, spatially resolved ultraviolet-visible spectra of Io from the Space Telescope Imaging Spectrograph on the …
Ram pressure stripping in the z ∼ 0.5 galaxy cluster MS 0451.6-0305
Durret, F.; Ebeling, H.; Jauzac, M. +3 more
Context. The pressure exerted by the ambient hot X-ray gas on cluster galaxies can lead to the presence of ram pressure stripped (RPS) galaxies, characterized by asymmetric shapes, and, in some cases, tails of blue stars and/or X-ray gas, with increased star formation.
Aims: With the aim of increasing the known sample of RPS galaxies at redsh…
Two years of optical and NIR observations of the superluminous supernova UID 30901 discovered by the UltraVISTA SN survey
Milvang-Jensen, B.; Fynbo, J. P. U.; Anderson, J. P. +6 more
We present deep optical and near-infrared photometry of UID 30901, a superluminous supernova (SLSN) discovered during the UltraVISTA survey. The observations were obtained with VIRCAM (YJHKs) mounted on the VISTA telescope, DECam (griz) on the Blanco telescope, and SUBARU Hyper Suprime-Cam (HSC; grizy). These multiband observations comp…
The Nearby Dwarf Irregular Galaxy IC 1613 and Its Complex Bubble Region: Chandra and VLA Observations
Schlegel, E. M.; Pannuti, Thomas G.; Moiseev, A. +2 more
We observed the nearby irregular galaxy IC 1613 with the Chandra X-ray Observatory, for 49.9 ks using the ACIS S3 chip, and with the VLA at 6 cm for 0.7 hr. The Chandra observation targeted the extensive bubble region in the northeast quadrant. We detect 31 sources within the D 25 diameter above a significance of 3σ corresponding to a p…
A Photometric and Spectroscopic Study of the Short-period Algol EW Boötis with a δ Sct Pulsator
Hong, Kyeongsoo; Lee, Jae Woo; Kim, Chun-Hwey +4 more
In this paper, we present Transiting Exoplanet Survey Satellite (TESS) photometry and high-resolution spectra of the short-period Algol EW Boo. We obtained double-lined radial velocities (RVs) from the time-series spectra and measured the effective temperature of the primary star as T eff,1 = 8560 ± 118 K. For the orbital period study, …
Detection of an unidentified soft X-ray emission feature in NGC 5548
Gu, Liyi; Ward, Martin; Mehdipour, Missagh +17 more
Context. NGC 5548 is an X-ray bright Seyfert 1 active galaxy. It exhibits a variety of spectroscopic features in the soft X-ray band, in particular including the absorption by the active galactic nucleus (AGN) outflows of a broad range of ionization states, with column densities up to 1027 m−2, and having speeds up to several…
Quantitative Evaluation of Coronal Magnetic Field Models Using Tomographic Reconstructions of Electron Density
Arge, C. N.; Henney, C. J.; Wang, T. J. +3 more
We introduce a new quantitative approach for assessing the quality of coronal magnetic field models. The method compares the location of the magnetic neutral line at a specified height in the magnetic field model with the locations of localized density peaks in the coronal electron density, as measured using coronal rotational tomography. This app…
PNV J00444033+4113068: Early superhumps with 0.7 mag amplitude and non-red color
Maehara, Hiroyuki; Nogami, Daisaku; Uemura, Makoto +13 more
In the first days of WZ Sge-type dwarf nova (DN) outbursts, the 2 : 1 resonance induces a spiral arm structure in the accretion disk, which is observed as early superhumps in optical light curves. We reports on our optical observations of an eclipsing WZ Sge-type DN PNV J00444033+4113068 during its 2021 superoutburst using the 3.8 m Seimei telesco…