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Low [O/Fe] Ratio in a Luminous Galaxy at the Early Cosmic Epoch (z > 10): Signature of Short Delay Time or Bright Hypernovae/Pair-instability Supernovae?
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +12 more
We present an [O/Fe] ratio of a luminous galaxy GN-z11 at z = 10.60 derived with the deep public JWST/NIRSpec data. We fit the medium-resolution grating (G140M, G235M, and G395M) data with the model spectra consisting of BPASS-stellar and CLOUDY-nebular spectra in the rest-frame UV wavelength ranges with Fe absorption lines, carefully masking the …
Abell 746: A Highly Disturbed Cluster Undergoing Multiple Mergers
Brunetti, G.; Lovisari, L.; Jee, M. J. +21 more
We present deep XMM-Newton, Karl G. Jansky Very Large Array, and upgraded Giant Metrewave Radio Telescope observations of Abell 746, a cluster that hosts a plethora of diffuse emission sources that provide evidence for the acceleration of relativistic particles. Our new XMM-Newton images reveal a complex morphology of the thermal gas with several …
Forming localized dust concentrations in a dust ring: DM Tau case study. The asymmetric 7 mm dust continuum of the DM Tau disk
Dong, Ruobing; Kataoka, Akimasa; Liu, Hauyu Baobab +8 more
Context. Previous high-angular-resolution 225 GHz (~1.3 mm) continuum observations of the transitional disk DM Tau have resolved an outer ring at 20-120 au radii that is weakly azimuthally asymmetric.
Aims: We aim to examine dust growth and filtration in the outer ring of DM Tau.
Methods: We performed ~0″.06 (~8.7 au) resolution Karl G. …
TEMPLATES: Characterization of a Merger in the Dusty Lensing SPT0418–47 System
Hutchison, Taylor A.; Mahler, Guillaume; Rigby, Jane R. +24 more
We present JWST and Atacama Large Millimeter/submillimeter Array (ALMA) imaging for the lensing system SPT0418‑47, which includes a strongly lensed, dusty, star-forming galaxy at redshift z = 4.225 and an associated multiply imaged companion. The JWST NIRCam and MIRI imaging observations presented in this paper were acquired as part of the Early R…
X-ray view of dissipative warm corona in active galactic nuclei
Bianchi, S.; Petrucci, P. O.; Belmont, R. +8 more
Context. Detections of the X-ray spectra of active galactic nuclei (AGNs) typically reveal a noticeable excess of soft X-rays beyond the extrapolation of the power-law trend observed between 2 and 10 keV. However, the cause of this surplus remains unclear. In the scenario of soft Comptonization, observations suggest a warm corona temperature, rang…
E-XQR-30: The evolution of Mg II, C II, and O I across 2 < z < 6
Lai, Samuel; Bosman, Sarah E. I.; Meyer, Romain A. +12 more
Intervening metal absorbers in quasar spectra at z > 6 can be used as probes to study the chemical enrichment of the Universe during the Epoch of Reionization. This work presents the comoving line densities (dn/dX) of low-ionization absorbers, namely, Mg II (2796 Å), C II (1334 Å), and O I (1302 Å) across 2 < z < 6 using the E-XQR-30 meta…
Hunting down white dwarf-main sequence binaries using multiwavelength observations
Chatterjee, Sourav; Nayak, Prasanta K.; Ganguly, Anindya
Identification of white dwarfs (WD) with main-sequence (MS) companions and characterization of their properties can put important constraints on our understanding of binary stellar evolution and guide the theoretical predictions for a wide range of interesting transient events relevant for, e.g. Rubin Observatory (LSST), ZTF, and LISA. In this stu…
Mid-infrared Spectrum of the Disk around the Forming Companion GQ Lup B Revealed by JWST/MIRI
Banzatti, Andrea; MacDonald, Ryan J.; Stolker, Tomas +5 more
GQ Lup B is a forming brown dwarf companion (M ∼ 10–30 M J) showing evidence for an infrared excess associated with a disk surrounding the companion itself. Here we present mid-infrared (MIR) observations of GQ Lup B with the Medium Resolution Spectrometer (MRS) on JWST, spanning 4.8–11.7 µm. We remove the stellar contamination us…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the Circumgalactic Medium Metal Enrichment at z > 6 Using the JWST and VLT
Chevallard, Jacopo; Hennawi, Joseph F.; Fan, Xiaohui +27 more
We characterize the multiphase circumgalactic medium (CGM) and galaxy properties at z = 6.0–6.5 in four quasar fields from the James Webb Space Telescope A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE) program. We use the Very Large Telescope/X-shooter spectra of quasar J0305–3150 to identify one new metal absorber at z = 6…
Examining the nature of the ultraluminous X-ray source Holmberg II X-1
Pinto, C.; Di Salvo, T.; Roberts, T. P. +4 more
We present a comprehensive spectral analysis of the ultraluminous X-ray source Holmberg II X-1 using broadband and high-resolution X-ray spectra taken with the XMM-Newton satellite over a period of 19 yr, taking advantage of data from a recent campaign. We tested several models for the broadband spectra, including a double thermal component provid…