Search Publications
The Star Formation Efficiency during Reionization as Inferred from the Hubble Frontier Fields
Lidz, Adam; Sipple, Jackson
A recent ultraviolet luminosity function (UVLF) analysis in the Hubble Frontier Fields, behind foreground lensing clusters, has helped solidify estimates of the faint-end of the z ~ 5-9 UVLF at up to 5 mag fainter than in the field. These measurements provide valuable information regarding the role of low-luminosity galaxies in reionizing the univ…
Self-interacting Dark Matter Interpretation of Crater II
Yang, Daneng; Yu, Hai-Bo; Zhang, Xingyu +1 more
The satellite galaxy Crater II of the Milky Way is extremely cold and exceptionally diffuse. These unusual properties are challenging to understand in the standard model of cold dark matter. We use controlled N-body simulations to investigate the formation of Crater II in self-interacting dark matter (SIDM), where dark matter particles can scatter…
The metal-poor atmosphere of a potential sub-Neptune progenitor
Fortney, Jonathan J.; Désert, Jean-Michel; Petigura, Erik A. +12 more
Young transiting exoplanets offer a unique opportunity to characterize the atmospheres of freshly formed and evolving planets. We present the transmission spectrum of V1298 Tau b, a 23-Myr-old warm Jupiter-sized (0.91 ± 0.05 RJ, where RJ is the radius of Jupiter) planet orbiting a pre-main-sequence star. We detect a mostly cl…
The rate and contribution of mergers to mass assembly from NIRCam observations of galaxy candidates up to 13.3 billion years ago
Santini, Paola; Calabrò, Antonello; Castellano, Marco +8 more
We present an analysis of the galaxy merger rate in the redshift range
A biconical ionised gas outflow and evidence of positive feedback in NGC 7172 uncovered by MIRI/JWST
Rouan, D.; Rigopoulou, D.; Gandhi, P. +35 more
We present observations of the type-2 Seyfert NGC 7172 obtained with the medium-resolution spectrometer (MRS) of the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST). This galaxy hosts one of the lowest ionised gas mass outflow rates (Ṁout ∼ 0.005 M⊙ yr‑1) in a sample of six active gala…
J-PLUS: Toward a homogeneous photometric calibration using Gaia BP/RP low-resolution spectra
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Carrasco, J. M. +21 more
Aims: We present the photometric calibration of the 12 optical passbands for the Javalambre Photometric Local Universe Survey (J-PLUS) third data release (DR3) comprising 1642 pointings of two square degrees each.
Methods: We selected nearly 1.5 million main sequence stars with a signal-to-noise ratio larger than ten in the 12 J-PLUS pas…
High Hard X-Ray Polarization in Cygnus X-1 Confined to the Intermediate Hard State: Evidence for a Variable Jet Component
Rao, A. R.; Bhalerao, Varun; Mithun, N. P. S. +7 more
Cygnus X-1, the well-known accreting black hole system, exhibits several observational features hinting at an intricate interplay between the accretion disk, its atmosphere known as the corona, and the putative relativistic jet. It has been extensively studied using all available observational methods, including using the newly available technique…
The Dynamic, Chimeric Inner Disk of PDS 70
Banzatti, Andrea; Gaidos, Eric; Shappee, Benjamin J. +4 more
Transition disks, with inner regions depleted in dust and gas, could represent later stages of protoplanetary disk evolution when newly formed planets are emerging. The PDS 70 system has attracted particular interest because of the presence of two giant planets in orbits at tens of astronomical units within the inner disk cavity, at least one of w…
The host dark matter haloes of the first quasars
Costa, Tiago
If z > 6 quasars reside in rare, massive haloes, ΛCDM cosmology predicts they should be surrounded by an anomalously high number of bright companion galaxies. Here, I show that these companion galaxies should also move unusually fast. Using a new suite of cosmological, 'zoom-in' hydrodynamic simulations, I present predictions for the velocity d…
DEIMOS spectroscopy of z = 6 protocluster candidate in COSMOS - a massive protocluster embedded in a large-scale structure?
Casey, Caitlin M.; Zavala, Jorge A.; Brammer, Gabriel +14 more
We present the results of our Keck/DEep Imaging Multi-Object Spectrograph spectroscopic follow-up of candidate galaxies of I-band-dropout protocluster candidate galaxies at z ~ 6 in the COSMOS field. We securely detect Lyman α emission lines in 14 of the 30 objects targeted, 10 of them being at z = 6 with a signal-to-noise ratio of 5-20; the remai…