Search Publications
First high-resolution optical spectra of the distant emission-line star VES 723 (IRAS 02110+6212)
Miroshnichenko, A. S.; Manset, N.; Klochkova, V. G. +3 more
The first high-resolution spectra (resolving powers of R ≥ 60 000) of the emission-line star VES 723, which has an unknown evolutionary status, were taken at the 6-m Big Telescope Alt-Azimuthal and the 3.6-m Canada-France-Hawaii Telescope. The spectrum is dominated with powerful emission lines of neutral hydrogen and helium, and forbidden singly i…
A puzzling non-detection of [O III] and [C II] from a z ≈ 7.7 galaxy observed with ALMA
Taniguchi, Y.; Umehata, H.; Zackrisson, E. +12 more
Context. Characterizing the galaxy population in the early Universe holds the key to understanding the evolution of these objects and the role they played in cosmic reionization. However, there have been very few observations at the very highest redshifts to date.
Aims: In order to shed light on the properties of galaxies in the high-redshift…
Probing the physical properties of the intergalactic medium using blazars
Morris, Simon L.; Fumagalli, Michele; Gatuzz, Efrain +1 more
We use Swift blazar spectra to estimate the key intergalactic medium (IGM) properties of hydrogen column density ($\mathit {N}\small {\rm HXIGM}$), metallicity, and temperature over a redshift range of 0.03 ≤ z ≤ 4.7, using a collisional ionization equilibrium model for the ionized plasma. We adopted a conservative approach to the blazar continuum…
The Y dwarf population with HST: unlocking the secrets of our coolest neighbours - I. Overview and first astrometric results
Bedin, L. R.; Fontanive, C.; Bardalez Gagliuffi, D. C.
In this paper, we present our project that aims at determining accurate distances and proper motions for the Y brown dwarf population using the Hubble Space Telescope. We validate the program with our first results, using a single new epoch of observations of the Y0pec dwarf WISE J163940.83-684738.6. These new data allowed us to refine its proper …
The effect of thermal conductivity on the outgassing and local gas dynamics from cometary nuclei
Thomas, N.; Marschall, R.; Gerig, S. -B. +3 more
Aims: The aim of this work is to investigate the parameters influencing the generation of the inner comae of a comet with a spherical nucleus and to model the gas activity distribution around its nuclei. Here, we investigate the influence of thermal conductivity combined with sub-surface H2O and CO2-ice sources on insola…
Primordial black hole origin for thermal gamma-ray bursts
Barco, Oscar
A binary black hole (BH) astrophysical scenario where a mass-constrained (2.5 × 10-13M⊙) primordial black hole (PBH) undergoes a radial fall on to its heavier component (such as a supermassive black hole, SMBH) is described as an intense gamma-ray emission event. As the relativistic PBH approaches the Schwarschild SMBH event …
Type III Radio Bursts Observations on 20th August 2017 and 9th September 2017 with LOFAR Bałdy Telescope
Zucca, Pietro; Vocks, Christian; Mann, Gottfried +7 more
[C II] and CO Emission along the Bar and Counter-arms of NGC 7479
Laine, Seppo; Fadda, Dario; Appleton, Philip N.
We present new SOFIA [C II] and ALMA COJ=1→0 observations of the nearby asymmetric barred spiral galaxy NGC 7479. The data, which cover the whole bar of the galaxy and the counter-arms visible in the radio continuum, are analyzed in conjunction with a wealth of existing visible, infrared, radio, and X-ray data. As in most normal galaxie…
The warm-up phase in massive star-forming cores around RCW 120
Wiebe, D. S.; Kirsanova, M. S.; Salii, S. V. +3 more
We study molecular emission in a massive condensation at the border of the H II region RCW 120, paying particular attention to the Core 1 and 2 objects, the most massive fragments of the condensation found previously by ALMA. The latter fragment was previously suggested to host a high-mass analogue of Class 0 young stellar object. We present spect…
Active galactic nuclei catalog from the AKARI NEP-Wide field
Goto, Tomotsugu; Kim, Seong Jin; Ho, Simon C. -C. +12 more
Context. The north ecliptic pole (NEP) field provides a unique set of panchromatic data that are well suited for active galactic nuclei (AGN) studies. The selection of AGN candidates is often based on mid-infrared (MIR) measurements. Such methods, despite their effectiveness, strongly reduce the breadth of resulting catalogs due to the MIR detecti…