Search Publications
High-resolution X-ray spectra of RS Ophiuchi (2006 and 2021): Revealing the cause of SSS variability
Ness, J. -U.; Munari, U.; Orio, M. +9 more
Context. The ~ 10-20 yr recurrent symbiotic nova RS Oph exploded on 2021 August 9, the seventh confirmed recorded outburst since 1898. During the previous outburst in 2006, the current fleet of X-ray space observatories was already in operation, and thanks to the longevity of Swift, XMM-Newton, and Chandra, a direct comparison between these two ou…
Evidence for Population-dependent Vertical Motions and the Long-lived Nonsteady Lopsided Milky Way Warp
Li, Xiang; Ting, Yuan-Sen; Wang, Hai-Feng +3 more
We present a Galactic disk vertical velocity analysis using OB type stars (OB stars), red clump (RC) stars, and main-sequence turnoff (MSTO) stars with different average age populations crossmatched with LAMOST DR5 and Gaia DR3. We show that the vertical velocities of the three populations clearly vary with the Galactocentric distance (R) and the …
The Tucana dwarf spheroidal: a distant backsplash galaxy of M31?
Navarro, Julio F.; McConnachie, Alan; Santos-Santos, Isabel M. E.
We use the APOSTLE Local Group (LG) cosmological hydrosimulations to examine the properties of 'backsplash' galaxies, i.e. dwarfs that were within the virial boundaries of the Milky Way (MW) or M31 in the past, but are today outside their virial radius (r200). More than half of all dwarfs between $1\text{ and }2\, r_{200}$ of each prima…
Orbital Decay in an Accreting and Eclipsing 13.7 Minute Orbital Period Binary with a Luminous Donor
Kulkarni, S. R.; Riddle, Reed; Chakrabarty, Deepto +24 more
We report the discovery of ZTF J0127+5258, a compact mass-transferring binary with an orbital period of 13.7 minutes. The system contains a white dwarf accretor, which likely originated as a post-common envelope carbon-oxygen (CO) white dwarf, and a warm donor (T eff,donor = 16,400 ± 1000 K). The donor probably formed during a common en…
Euclid preparation. XXX. Performance assessment of the NISP red grism through spectroscopic simulations for the wide and deep surveys
Aussel, H.; Rodighiero, G.; Palazzi, E. +235 more
This work focusses on the pilot run of a simulation campaign aimed at investigating the spectroscopic capabilities of the Euclid Near-Infrared Spectrometer and Photometer (NISP), in terms of continuum and emission line detection in the context of galaxy evolutionary studies. To this purpose, we constructed, emulated, and analysed the spectra of 49…
The First Flight of the Marshall Grazing Incidence X-Ray Spectrometer (MaGIXS)
Reeves, Katharine K.; Del Zanna, Giulio; Golub, Leon +35 more
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on 2021 July 30 from the White Sands Missile Range in New Mexico. MaGIXS is a unique solar observing telescope developed to capture X-ray spectral images of coronal active regions in the 6-24 Å wavelength range. Its novel design takes advantage of recent…
On the Reionization-era Globular Cluster in the Low-mass Galaxy Eridanus II
Dolphin, Andrew E.; Weisz, Daniel R.; Savino, Alessandro
Using color-magnitude diagrams from deep archival Hubble Space Telescope imaging, we self-consistently measure the star formation history of Eridanus II (Eri II), the lowest-mass galaxy (M ⋆(z = 0) ~ 105 M ⊙) known to host a globular cluster (GC), and the age, mass, and metallicity of its GC. The GC (~13.2 ± 0.4 Gy…
Magnetically activated accretion outbursts of pre-main-sequence discs
Bae, Jaehan; Hartmann, Lee; Cleaver, Jacob
We investigate whether triggering of the magnetorotational instability (MRI) in protoplanetary discs can account for the wide diversity of observed accretion outbursts. We show that short-lived, relatively low accretion rate events probably result from triggering in the inner disc and can occur at low surface densities, comparable to or smaller th…
Discovering strongly lensed quasar candidates with catalogue-based methods from DESI Legacy Surveys
Zou, Hu; Li, Nan; He, Zizhao +3 more
Context. The Hubble tension, revealed by a ~5σ discrepancy between measurements of the Hubble-Lemaitre constant among observations of the early and local Universe, is one of the most significant problems in modern cosmology. In order to better understand the origin of this mismatch, independent techniques to measure H0, such as strong l…
The star formation history and the nature of the mass-metallicity relation of passive galaxies at 1.0 < z < 1.4 from VANDELS
De Lucia, G.; Marchesini, D.; Nonino, M. +9 more
We derived stellar ages and metallicities [Z/H] for ~70 passive early-type galaxies (ETGs) selected from VANDELS survey over the redshift range 1.0 < z < 1.4 and stellar mass range 10 < log(M*/M⊙) < 11.6. We find significant systematics in their estimates depending on models and wavelength ranges considered. Using…