Search Publications
ALMA [C II] 158 µm Detection of a Redshift 7 Lensed Galaxy behind RXJ1347.1-1145
Carilli, Chris; Fontana, Adriano; Treu, Tommaso +14 more
We present the results of ALMA spectroscopic follow-up of a z = 6.766 Lyα emitting galaxy behind the cluster RX J1347.1-1145. We report the detection of [C II] 158 µm line fully consistent with the Lyα redshift and with the peak of the optical emission. Given the magnification of µ = 5.0 ± 0.3, the intrinsic (corrected for lensing) lum…
A population of eruptive variable protostars in VVV
Minniti, D.; Lucas, P. W.; Thompson, M. A. +10 more
We present the discovery of 816 high-amplitude infrared variable stars (ΔKs > 1 mag) in 119 deg2 of the Galactic mid-plane covered by the VISTA Variables in the Via Lactea (VVV) survey. Almost all are new discoveries and about 50 per cent are young stellar objects (YSOs). This provides further evidence that YSOs are the co…
Effective temperatures of cataclysmic-variable white dwarfs as a probe of their evolution
Reichart, D. E.; Knigge, C.; Gänsicke, B. T. +29 more
We present HST spectroscopy for 45 cataclysmic variables (CVs), observed with HST/COS and HST/STIS. For 36 CVs, the white dwarf is recognisable through its broad Ly α absorption profile and we measure the white dwarf effective temperatures (Teff) by fitting the HST data assuming log g = 8.35, which corresponds to the average mass for CV…
Determining the Intrinsic CME Flux Rope Type Using Remote-sensing Solar Disk Observations
Palmerio, E.; Kilpua, E. K. J.; Green, L. M. +4 more
A key aim in space weather research is to be able to use remote-sensing observations of the solar atmosphere to extend the lead time of predicting the geoeffectiveness of a coronal mass ejection (CME). In order to achieve this, the magnetic structure of the CME as it leaves the Sun must be known. In this article we address this issue by developing…
Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b
Deming, Drake; Madhusudhan, Nikku; Gandhi, Siddharth +4 more
We find evidence for a strong thermal inversion in the dayside atmosphere of the highly irradiated hot Jupiter WASP-18b ({T}{eq}=2411 {{K}}, M=10.3 {M}J) based on emission spectroscopy from Hubble Space Telescope secondary eclipse observations and Spitzer eclipse photometry. We demonstrate a lack of water vapor in either abso…
Characterizing Intracluster Light in the Hubble Frontier Fields
Schmidt, Kasper B.; Treu, Tommaso; Vulcani, Benedetta +3 more
We investigate the intracluster light (ICL) in the six Hubble Frontier Field clusters at 0.3< z< 0.6. We employ a new method, which is free from any functional form of the ICL profile, and exploit the unprecedented depth of this Hubble Space Telescope imaging to map the ICL’s diffuse light out to clustrocentric radii R∼ 300 {kpc} ({µ }…
The dust-to-ices ratio in comets and Kuiper belt objects
Fulle, M.; Colangeli, L.; Della Corte, V. +7 more
Comet 67P/Churyumov-Gerasimenko (67P hereinafter) is characterized by a dust transfer from the southern hemi-nucleus to the night-side northern dust deposits, which constrains the dust-to-ices mass ratio inside the nucleus to values a factor of 2 larger than that provided by the lost mass of gas and non-volatiles. This applies to all comets becaus…
Extremely Small Sizes for Faint z ∼ 2-8 Galaxies in the Hubble Frontier Fields: A Key Input for Establishing Their Volume Density and UV Emissivity
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +3 more
We provide the first observational constraints on the sizes of the faintest galaxies lensed by the Hubble Frontier Fields (HFF) clusters. Ionizing radiation from faint galaxies likely drives cosmic reionization, and the HFF initiative provides a key opportunity to find such galaxies. However, we cannot assess their ionizing emissivity without a ro…
On the kinematic detection of accreted streams in the Gaia era: a cautionary tale
Haywood, M.; Combes, F.; Gómez, A. +4 more
The ΛCDM cosmological scenario predicts that our Galaxy should contain hundreds of stellar streams in the solar vicinity, fossil relics of the merging history of the Milky Way and more generally of the hierarchical growth of galaxies. Because of the mixing time scales in the inner Galaxy, it has been claimed that these streams should be difficult …
Panchromatic Hubble Andromeda Treasury. XVIII. The High-mass Truncation of the Star Cluster Mass Function
Dolphin, Andrew E.; Williams, Benjamin F.; Johnson, L. Clifton +7 more
We measure the mass function for a sample of 840 young star clusters with ages between 10 and 300 Myr observed by the Panchromatic Hubble Andromeda Treasury (PHAT) survey in M31. The data show clear evidence of a high-mass truncation: only 15 clusters more massive than {10}4 {M}⊙ are observed, compared to the ∼100 expected f…