Search Publications
Scaling relations of X-ray luminous clusters in the Hyper Suprime-Cam Subaru Strategic Program field
Fukazawa, Yasushi; Okabe, Nobuhiro; Poon, Helen +2 more
We present the XMM-Newton X-ray analysis of 19 X-ray luminous galaxy clusters of low- to mid-redshift (<0.4) selected from the MCXC (Meta-Catalog of X-Ray Detected Clusters of Galaxies) cluster catalogue in the Hyper Suprime-Cam Subaru Strategic Programme field. We derive the hydrostatic equilibrium mass and study scaling relations using (i) th…
The MeerKAT Galaxy Clusters Legacy Survey: star formation in massive clusters at 0.15 < z < 0.35
Knowles, K.; Clarke, T. E.; Hilton, M. +5 more
We investigate dust-unbiased star formation rates (SFRs) as a function of the environment in 20 massive clusters ($M_{200}\gt 4\times 10^{14}\, {\rm M}_{\odot }$) between 0.15 < $z$ < 0.35 using radio luminosities (L1.4GHz) from the recently released MeerKAT Galaxy Cluster Legacy Survey catalogue. We use optical data from the Dark…
N2/CO ratio in comets insensitive to orbital evolution
Mousis, O.; Jehin, E.; Anderson, S. E. +2 more
Comets are seen as depleted in nitrogen compared to the protosolar value, but a small number exhibit significantly higher than typical N2/CO ratios: C/1908 R1 (Morehouse), C/1940 R2 (Cunningham), C/1947 S1 (Bester), C/1956 R1 (Arend-Roland), C/1957 P1 (Mrkos), C/1961 R1 (Humason), C/1969 Y1 (Bennett), C/1973 E1 (Kohoutek), C/1975 V1-A (…
Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly α emitters and IGM transmission in the COSMOS field at z ∼ 5
Ono, Yoshiaki; Ouchi, Masami; Hennawi, Joseph F. +5 more
We present a novel technique called 'photometric IGM tomography' to map the intergalactic medium (IGM) at z ≃ 4.9 in the COSMOS field. It utilizes deep narrow-band (NB) imaging to photometrically detect faint Ly α forest transmission in background galaxies across the Subaru/Hyper-Suprime Cam (HSC)'s $1.8\rm \, sq.\, deg$ field of view and locate L…
The vertex coordinates of the Galaxy's stellar systems according to the Gaia DR3 catalogue
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +2 more
We present the results of determining the coordinates of the vertices of various stellar systems, the centroids of which are located in the Galactic plane. To do this, the positions, parallaxes, proper motions, and radial velocities of red giants and subgiants contained in the Gaia DR3 catalogue have been used. When determining the components of t…
NGTS clusters survey - V. Rotation in the Orion star-forming complex
Ramsay, Gavin; Wheatley, Peter J.; Moyano, Maximiliano +16 more
We present a study of rotation across 30 square degrees of the Orion Star-forming Complex, following a ~200 d photometric monitoring campaign by the Next Generation Transit Survey (NGTS). From 5749 light curves of Orion members, we report periodic signatures for 2268 objects and analyse rotation period distributions as a function of colour for 178…
Kpc-scale properties of dust temperature in terms of dust mass and star formation activity
Sandstrom, Karin M.; Leroy, Adam K.; Rosolowsky, Erik +7 more
We investigate how dust temperature is affected by local environmental quantities, especially dust surface density (Σdust), dust-to-gas ratio (D/G), and interstellar radiation field. We compile multiwavelength observations in 46 nearby galaxies, uniformly processed with a common physical resolution of 2 kpc. A physical dust model is use…
Novae in M51: a new, much higher rate from multi-epoch HST data
van Dokkum, Pieter; Conroy, Charlie; Shara, Michael M. +2 more
Accurate determination of the rates of nova eruptions in different kinds of galaxies gives us strong constraints on those galaxies' underlying white dwarf and binary populations, and those stars' spatial distributions. Until 2016, limitations inherent in ground-based surveys of external galaxies - and dust extinction in the Milky Way - significant…
Searching for ejected supernova companions in the era of precise proper motion and radial velocity measurements
Lyman, J. D.; Groot, P. J.; Wiersema, K. +7 more
The majority of massive stars are born in binaries, and most unbind upon the first supernova. With precise proper motion surveys such as Gaia, it is possible to trace back the motion of stars in the vicinity of young remnants to search for ejected companions. Establishing the fraction of remnants with an ejected companion, and the photometric and …
High-resolution spectroscopic analysis of four new chemically peculiar stars
Pereira, C. B.; Sneden, C.; Drake, N. A. +3 more
We present detailed chemical compositions of four stars on the first-ascent red giant branch that are classified as chemically peculiar, but lack comprehensive analyses at high spectral resolution. For BD+03°2688, HE 0457-1805, HE 1255-2324, and HE 2207-1746, we derived metallicities [Fe/H] = -1.21, -0.19, -0.31, and -0.55, respectively, indicatin…