Search Publications
Early science with the Large Millimeter Telescope: observations of extremely luminous high-z sources identified by Planck
Terlevich, E.; Terlevich, R.; Yun, Min S. +17 more
We present 8.5 arcsec resolution 1.1-mm continuum imaging and CO spectroscopic redshift measurements of eight extremely bright submillimetre galaxies identified from the Planck and Herschel surveys, taken with the Large Millimeter Telescope's AzTEC and Redshift Search Receiver instruments. We compiled a candidate list of high-redshift galaxies by …
Late-time Photometry of Type Ia Supernova SN 2012cg Reveals the Radioactive Decay of 57 Co
Rest, Armin; Riess, Adam G.; Graur, Or +3 more
Seitenzahl et al. have predicted that roughly three years after its explosion, the light we receive from a Type Ia supernova (SN Ia) will come mostly from reprocessing of electrons and X-rays emitted by the radioactive decay chain 57Co → 57Fe, instead of positrons from the decay chain 56Co → 56Fe that do…
A 5 x 109 Msun Black Hole in NGC 1277 from Adaptive Optics Spectroscopy
Gebhardt, Karl; Richstone, Douglas O.; Husemann, Bernd +4 more
The nearby lenticular galaxy NGC 1277 is thought to host one of the largest black holes known, however the black hole mass measurement is based on low spatial resolution spectroscopy. In this paper, we present Gemini Near-infrared Integral Field Spectrometer observations assisted by adaptive optics. We map out the galaxy's stellar kinematics withi…
A comprehensive comparative test of seven widely used spectral synthesis models against multi-band photometry of young massive-star clusters
Östlin, G.; Cignoni, M.; Calzetti, D. +13 more
We test the predictions of spectral synthesis models based on seven different massive-star prescriptions against Legacy ExtraGalactic UV Survey (LEGUS) observations of eight young massive clusters in two local galaxies, NGC 1566 and NGC 5253, chosen because predictions of all seven models are available at the published galactic metallicities. The …
The Grism Lens-Amplified Survey from Space (GLASS). III. A Census of Lyα Emission at z ≳ 7 from HST Spectroscopy
Vulcani, B.; Hoag, A.; Bradač, M. +15 more
We present a census of Lyα emission at z≳ 7, utilizing deep near-infrared Hubble Space Telescope grism spectroscopy from the first six completed clusters of the Grism Lens-Amplified Survey from Space (GLASS). In 24/159 photometrically selected galaxies we detect emission lines consistent with Lyα in the GLASS spectra. Based on the distribution of …
Characterizing cometary electrons with kappa distributions
Frahm, R. A.; Eriksson, A.; Henri, P. +17 more
The Rosetta spacecraft has escorted comet 67P/Churyumov-Gerasimenko since 6 August 2014 and has offered an unprecedented opportunity to study plasma physics in the coma. We have used this opportunity to make the first characterization of cometary electrons with kappa distributions. Two three-dimensional kappa functions were fit to the observations…
The Close AGN Reference Survey (CARS). What is causing Mrk 1018's return to the shadows after 30 years?
Combes, F.; Scharwächter, J.; Eckart, A. +11 more
We recently discovered that the active galactic nucleus (AGN) of Mrk 1018 has changed optical type again after 30 yr as a type 1 AGN. Here we combine Chandra, NuStar, Swift, Hubble Space Telescope and ground-based observations to explore the cause of this change. The 2-10 keV flux declines by a factor of ~8 between 2010 and 2016. We show with our …
Detecting direct collapse black holes: making the case for CR7
van den Bosch, Frank C.; Natarajan, Priyamvada; Zackrisson, Erik +4 more
We propose that one of the sources in the recently detected system CR7 by Sobral et al. through spectrophotometric measurements at z = 6.6 harbours a direct collapse black hole (DCBH). We argue that the LW radiation field required for direct collapse in source A is provided by sources B and C. By tracing the LW production history and star formatio…
Explosive Chromospheric Evaporation in a Circular-ribbon Flare
Guo, Y.; Li, D.; Ji, H. S. +3 more
In this paper, we report our multiwavelength observations of the C4.2 circular-ribbon flare in active region (AR) 12434 on 2015 October 16. The short-lived flare was associated with positive magnetic polarities and a negative polarity inside, as revealed by the photospheric line-of-sight magnetograms. Such a magnetic pattern is strongly indicative…
The ATLASGAL survey: distribution of cold dust in the Galactic plane. Combination with Planck data
Menten, K. M.; Weiss, A.; Henning, Th. +9 more
Context. Sensitive ground-based submillimeter surveys, such as ATLASGAL, provide a global view on the distribution of cold dense gas in the Galactic plane at up to two-times better angular-resolution compared to recent space-based surveys with Herschel. However, a drawback of ground-based continuum observations is that they intrinsically filter em…