Search Publications
Characteristics of mid-infrared PAH emission from star-forming galaxies selected at 250 µm in the North Ecliptic Pole field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +11 more
Evolutionary properties of infrared (IR) luminous galaxies are important keys to understand dust-obscured star formation history and galaxy evolution. Based on near- to mid-IR imaging with nine continuous filters of the AKARI space telescope, we present the characteristics of dusty star-forming (SF) galaxies showing polycyclic aromatic hydrocarbon…
SuperWASP dispositions and false positive catalogue
Bouchy, F.; Deleuil, M.; Queloz, D. +32 more
SuperWASP, the Northern hemisphere WASP observatory, has been observing the skies from La Palma since 2004. In that time, more than 50 planets have been discovered with data contributions from SuperWASP. In the process of validating planets, many false-positive candidates have also been identified. The TESS telescope is set to begin observations o…
The HST large programme on NGC 6752 - III. Detection of the peak of the white dwarf luminosity function
Salaris, M.; Apai, D.; Anderson, J. +10 more
We report on the white dwarf (WD) cooling sequence of the old globular cluster NGC 6752, which is chemically complex and hosts a blue horizontal branch. This is one of the last globular cluster WD cooling sequences accessible to imaging by the Hubble Space Telescope. Our photometry and completeness tests show that we have reached the peak of the l…
The `Big Dipper': the nature of the extreme variability of the AGN SDSS J2232-0806
MacLeod, Chelsea L.; Landt, Hermine; Kynoch, Daniel +3 more
SDSS J2232-0806 (the `Big Dipper') has been identified as a `slow-blue nuclear hypervariable': a galaxy with no previously known active nucleus, blue colours, and large-amplitude brightness evolution occurring on a time-scale of years. Subsequent observations have shown that this source does indeed contain an active galactic nucleus (AGN). Our opt…
Searching for hot subdwarf stars from the LAMOST Spectra. II. Pure spectroscopic identification method for hot subdwarfs
Zhao, Gang; Németh, Péter; Zhao, Jingkun +2 more
Employing a new machine-learning method, named the hierarchical extreme learning machine (HELM) algorithm, we identified 56 hot subdwarf stars in the first data release (DR1) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) survey. The atmospheric parameters of the stars are obtained by fitting the profiles of hydrogen (H)…
Keck HIRES spectroscopy of SkyMapper commissioning survey candidate extremely metal-poor stars
Schmidt, B. P.; Da Costa, G. S.; Marino, A. F. +11 more
We present results from the analysis of high-resolution spectra obtained with the Keck HIRES spectrograph for a sample of 17 candidate extremely metal-poor (EMP) stars originally selected from commissioning data obtained with the SkyMapper telescope. Fourteen of the stars have not been observed previously at high dispersion. Three have [Fe/H] ≤ -3…
Anomalous behaviour of the UV-optical continuum bands in NGC 5548
Knigge, C.; Kriss, G. A.; Starkey, D. A. +8 more
During the 2014 HST/Swift and ground-based multiwavelength monitoring campaign of NGC 5548 [active galactic nucleus (AGN) STORM], the UV-optical broad emission lines exhibited anomalous, decorrelated behaviour relative to the far-UV continuum flux variability. Here, we use key diagnostic emission lines (Ly α and He II) for this campaign to infer a…
An all-sky search for R Coronae Borealis stars in ASAS-SN
Kochanek, C. S.; Stanek, K. Z.; Dong, Subo +6 more
We report the discovery of 19 new R Coronae Borealis (RCB) star and DY Per candidates with light curves from the All-Sky Automated Survey for Supernovae. We examined both an existing set of 1602 near/mid-infrared (IR) selected candidates and an additional 2615 candidates selected to have near/mid-IR spectral energy distributions consistent with th…
The morpho-kinematics of the circumstellar envelope around the AGB star EP Aqr
Winters, J. M.; Tuan-Anh, P.; Hoai, D. T. +6 more
ALMA observations of CO(1-0) and CO(2-1) emissions of the circumstellar envelope of EP Aqr, an oxygen-rich asymptotic giant branch star, are reported. A thorough analysis of their properties is presented using an original method based on the separation of the data cube into a low-velocity component associated with an equatorial outflow and a faste…
Modelling the abundance structure of isocyanic acid (HNCO) towards the low-mass solar type protostar IRAS 16293-2422
Menten, Karl M.; Loinard, Laurent; Wiesenfeld, Laurent +5 more
Isocyanic acid (HNCO), the most stable of the simplest molecules containing the four main elements essential for organic chemistry, has been observed in several astrophysical environments such as molecular clouds, star-forming regions, external galaxies, and comets. In this work, we model HNCO spectral line profiles towards the low-mass solar type…