Search Publications
CSS1603+19: a low-mass polar near the cataclysmic variable period minimum
Thorstensen, John R.; Zakamska, Nadia L.; Hwang, Hsiang-Chih +1 more
CSS1603+19 is a cataclysmic variable (CV) with an orbital period of 81.96 min, near the minimal period of CVs. It is unusual in having a strong mid-infrared excess inconsistent with thermal emission from a brown dwarf companion. Here, we present time-resolved multiwavelength observations of this system. WISE photometry indicates that the mid-infra…
Probing general relativity in galactic scales at z 0.3
Chies-Santos, Ana L.; Furlanetto, Cristina; Melo-Carneiro, Carlos R.
General Relativity (GR) has been successfully tested mainly at Solar system scales; however, galaxy-scale tests have become popular in the last few decades. In this work, we investigate the ηPPN parameter, which is commonly defined by the ratio of two scalar potentials that appears in the cosmological linearly perturbed metric. Under th…
Gas absorption towards the η Tel debris disc: winds or clouds?
Rebollido, Isabel; Panić, Olja; Iglesias, Daniela P.
η Telescopii is an ~23 Myr old A-type star surrounded by an edge-on debris disc hypothesized to harbour gas. Recent analysis of far- and near-ultraviolet spectroscopic observations of η Tel found absorption features at ~-23 and ~-18 km s-1 in several atomic lines, attributed to circumstellar and interstellar gas, respectively. In this w…
The dual nature of the tidal tails of NGC 5904 (M5)
Piatti, Andrés E.
The tangential velocity dispersion of stars belonging to the Milky Way globular cluster's tidal tails has recently been found from N-body simulations to be a parameter that distinguishes between cored and cuspy profiles of low-mass dwarf galaxy dark matter subhaloes where that globular cluster formed, and the in situ formation scenario. In this co…
Centre-to-limb variations in coronal hole and quiet sun regions obtained with IRIS spectroscopic observations
Young, Peter R.; Kayshap, Pradeep
The centre-to-limb variations (CLV) of Gaussian fit parameters of the transition region Si IV 1402.77 Å spectral line in quiet Sun (QS) and coronal hole (CH) regions are presented. The results are derived from a full-disc mosaic scan obtained by the Interface Region Imaging Spectrograph on 2017 September 24. The CLV for a CH transition region line…
The X-ray point source population hosted by globular clusters in the elliptical galaxy NGC 4261
Kundu, Arunav; Dage, Kristen C.; Zepf, Stephen E. +4 more
Utilizing archival Chandra X-ray Observatory data and Hubble Space Telescope globular cluster catalogues, we probe the time-domain properties of the low mass X-ray binary population in the elliptical galaxy NGC 4261. Of the 98 unique X-ray sources identified in this study, 62 sources are within the optical field of view and, of those, 33 per cent …
Discovery of five Green pea galaxies with double-peaked narrow [O III] lines
Zheng, Zhen-Ya; Wang, Jun-Xian; Malhotra, Sangeeta +9 more
Although double-peaked narrow emission-line galaxies have been studied extensively in the past years, only a few are reported with the Green pea (GP) galaxies. Here we present our discovery of five GP galaxies with double-peaked narrow [O III] emission lines, referred to as DPGPs, selected from the LAMOST and SDSS spectroscopic surveys. We find th…
A variable active galactic nucleus at z = 2.06 triply-imaged by the galaxy cluster MACS J0035.4-2015
Koekemoer, Anton M.; Charlot, Stéphane; Chevallard, Jacopo +32 more
We report the discovery of a triply imaged active galactic nucleus (AGN), lensed by the galaxy cluster MACS J0035.4-2015 (zd = 0.352). The object is detected in Hubble Space Telescope imaging taken for the RELICS program. It appears to have a quasi-stellar nucleus consistent with a point-source, with a de-magnified radius of re
Resolving a merger in a hyperluminous submillimeter galaxy at z = 2.82
Smail, Ian; Bertoldi, F.; Chapman, S. C. +1 more
We present the resolved properties of the z = 2.82 hyperluminous infrared Galaxy (HyLIRG) HS1700.850.1, the brightest 850 $\mu$m source found in the SCUBA-2 followup to the Keck Baryonic Structure Survey fields (S850$\mu$m =19.5 mJy), and amongst the most luminous starbursts known at any redshift.- Using the IRAM-NOEMA interferometer in…
A blazar candidate for the Fermi source 4FGL J1848.7-0129
Luque-Escamilla, Pedro L.; Martí, Josep; Combi, Jorge A. +2 more
The Fermi source 4FGL J1848.7-0129 has been historically related to the globular cluster GLIMPSE-C01 since its very first detection. Although this association is widely accepted, as it appears in the most recent Fermi catalogue, it deserves to be revisited given the multiwavelength evidences and the recent discovery of variable X-ray sources in th…