Search Publications
Graphene oxide nanoparticles in the interstellar medium
Sarre, P. J.
Dust particles play a major role in the formation, evolution and chemistry of interstellar clouds, stars, and planetary systems. Commonly identified forms include amorphous and crystalline carbon-rich particles and silicates. Also present in many astrophysical environments are polycyclic aromatic hydrocarbons (PAHs), detected through their infrare…
Resolving the Interstellar Medium in Ultraluminous Infrared QSO Hosts with ALMA
Kohno, Kotaro; Daddi, Emanuele; Gao, Yu +8 more
We present ALMA observations of the CO(1-0) line and 3 mm continuum emission in eight ultraluminous infrared (IR) quasi-stellar objects (QSOs) at z = 0.06-0.19. All eight IR QSO hosts are clearly resolved in their CO molecular gas emission with a median source size of 3.2 kpc, and seven out of eight sources are detected in 3 mm continuum, which is…
Compact star-forming galaxies preferentially quenched to become PSBs in z < 1 clusters
Simpson, Chris; Wild, Vivienne; Almaini, Omar +5 more
We analyse the structure of galaxies with high specific star formation rate (SSFR) in cluster and field environments in the redshift range 0.5 < z < 1.0. Recent studies have shown that these galaxies are strongly depleted in dense environments due to rapid environmental quenching, giving rise to post-starburst galaxies (PSBs). We use effecti…
HST/COS Observations of the Warm Ionized Gaseous Halo of NGC 891
Bregman, Joel N.; Qu, Zhijie; Hodges-Kluck, Edmund J.
The metallicity of galactic gaseous halos provides insights into accretion and feedback of galaxies. The nearby edge-on galaxy NGC 891 has a multicomponent gaseous halo and a background active galactic nucleus (AGN; LQAC 035+042 003) projected 5 kpc above the disk near the minor axis. Against the UV continuum of this AGN, we detect lines from 13 i…
Discovery statistics and 1/a distribution of long-period comets detected during 1801-2017
Dybczyński, Piotr A.; Królikowska, Małgorzata
For the last two decades, we have been observing a huge increase in discoveries of long-period comets (LPCs), especially those with large perihelion distances. We collected data for a full sample of LPCs discovered during 1801-2017, including their osculating orbits, discovery moments (to study the discovery distances) and original semimajor axes …
New luminous blue variable candidates in NGC 4736
Vinokurov, A.; Solovyeva, Y.; Atapin, K. +8 more
We have found three new luminous blue variable (LBV) candidates in the star-forming galaxy NGC 4736. They show typical well-known LBV spectra, broad and strong hydrogen lines, He I lines, many Fe II lines, and forbidden [Fe II] and [Fe III]. Using archival Hubble Space Telescope and ground-based telescope data, we have estimated the bolometric mag…
Star formation in far-IR AGN and non-AGN galaxies in the green valley - II. Morphological analysis
Pović, Mirjana; Väisänen, Petri; Mahoro, Antoine +2 more
This paper studies morphological properties of 103 green valley FIR active and 2609 non-active galaxies presented in Mahoro, Pović & Nkundabakura (2017). The photometric data from the COSMOS survey were used, and the morphological parameters, such as Abraham and Conselice-Bershady concentration indices, Gini, M20 moment of light, and asymmetry…
Chemical analysis of K giants in the young open cluster NGC 2345
Pereira, C. B.; Holanda, N.; Drake, N. A.
We present results for the elemental abundances of five K giants of the young open cluster NGC 2345. The atmospheric parameters of the studied giants and their chemical abundances were determined using high-resolution optical spectroscopy. In this study, we determine abundances of light elements (Li, C, N), light odd-Z elements (Na, Al), α-element…
Detailed study of the Milky Way globular cluster Laevens 3
Martin, Nicolas; Ibata, Rodrigo A.; Mackey, Dougal +4 more
We present a photometric and spectroscopic study of the Milky Way satellite Laevens 3. Using MegaCam/Canada-France-Hawaii Telescope g and i photometry and Keck II/DEIMOS multi-object spectroscopy, we refine the structural and stellar properties of the system. The Laevens 3 colour-magnitude diagram shows that it is quite metal-poor, old (13.0 ± 1.0…
Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +34 more
Context. The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox. The Anhur region in the southern part of the comet's larger lobe was found to be highly eroded, enriched in volatiles, and highly active.
Aims: We analyze high-…