Search Publications
Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2
Debattista, Victor P.; Amarante, João A. S.; Beraldo e Silva, Leandro +2 more
Since thin disc stars are younger than thick disc stars on average, the thin disc is predicted by some models to start forming after the thick disc had formed, around 10 Gyr ago. Accordingly, no significant old thin disc population should exist. Using 6D coordinates from Gaia-DR2 and age estimates from Sanders & Das, we select ∼24 000 old star…
X-ray irradiation and evaporation of the four young planets around V1298 Tau
Mallonn, M.; Poppenhaeger, K.; Ketzer, L.
Planets around young stars are thought to undergo atmospheric evaporation due to the high magnetic activity of the host stars. Here we report on X-ray observations of V1298 Tau, a young star with four transiting exoplanets. We use X-ray observations of the host star with Chandra and ROSAT to measure the current high-energy irradiation level of the…
A new radio census of neutron star X-ray binaries
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +16 more
We report new radio observations of a sample of 36 neutron star (NS) X-ray binaries, more than doubling the sample in the literature observed at current-day sensitivities. These sources include 13 weakly magnetized (B < 1010 G) and 23 strongly magnetized (B ≥ 1010 G) NSs. 16 of the latter category reside in high-mass X-ray…
The UV-brightest Lyman continuum emitting star-forming galaxy
Pérez-Fournon, I.; Schaerer, D.; Marques-Chaves, R. +5 more
We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = -24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ratio rest-frame UV spectroscopy with the Gran Te…
The quasar feedback survey: discovering hidden Radio-AGN and their connection to the host galaxy ionized gas
Thomson, A. P.; Alexander, D. M.; Mainieri, V. +18 more
We present the first results from the Quasar Feedback Survey, a sample of 42 z < 0.2, [O III] luminous AGNs ( L[O III] > 1042.1 ergs s-1) with moderate radio luminosities (i.e. L1.4GHz > 1023.4 W Hz-1; median L1.4GHz = 5.9 × 1023 W Hz-1). Us…
RoboPol: AGN polarimetric monitoring data
Pearson, T. J.; Papadakis, I.; Blinov, D. +29 more
We present uniformly reprocessed and re-calibrated data from the RoboPol programme of optopolarimetric monitoring of active galactic nuclei (AGNs), covering observations between 2013, when the instrument was commissioned, and 2017. In total, the data set presented in this paper includes 5068 observations of 222 AGN with Dec. > -25○. …
PHANGS-HST: star cluster spectral energy distribution fitting with CIGALE
Van Dyk, Schuyler D.; Kruijssen, J. M. Diederik; Leroy, Adam K. +24 more
The sensitivity and angular resolution of photometric surveys executed by the Hubble Space Telescope (HST) enable studies of individual star clusters in galaxies out to a few tens of megaparsecs. The fitting of spectral energy distributions (SEDs) of star clusters is essential for measuring their physical properties and studying their evolution. W…
The non-linear infrared-radio correlation of low-z galaxies: implications for redshift evolution, a new radio SFR recipe, and how to minimize selection bias
Zamorani, Giovanni; Schinnerer, Eva; Vardoulaki, Eleni +7 more
The infrared-radio correlation (IRRC) underpins many commonly used radio luminosity-star formation rate (SFR) calibrations. In preparation for the new generation of radio surveys, we revisit the IRRC of low-z galaxies by (a) drawing on the best currently available infrared (IR) and 1.4 GHz radio photometry, plus ancillary data over the widest poss…
Lyman-alpha spectroscopy of extreme [O III] emitting galaxies at z ≃ 2-3: implications for Lyα visibility and LyC leakage at z > 6
Charlot, Stéphane; Chevallard, Jacopo; Tang, Mengtao +3 more
Spectroscopic observations of massive z > 7 galaxies selected to have extremely large [O III] + H β equivalent width (EW ~1500 Å) have recently revealed large Ly α detection rates, in contrast to the weak emission seen in the general population. Why these systems are uniquely visible in Ly α at redshifts where the intergalactic medium (IGM) is …
Anomaly detection in the Zwicky Transient Facility DR3
Pruzhinskaya, M. V.; Malanchev, K. L.; Ishida, E. E. O. +12 more
We present results from applying the SNAD anomaly detection pipeline to the third public data release of the Zwicky Transient Facility (ZTF DR3). The pipeline is composed of three stages: feature extraction, search of outliers with machine learning algorithms, and anomaly identification with followup by human experts. Our analysis concentrates in …