Search Publications
HUBPUG: proper motions for local group dwarfs observed with HST utilizing Gaia as a reference frame
Weisz, Daniel R.; Savino, Alessandro; Kallivayalil, Nitya +6 more
We present the method behind HUBPUG, a software tool built for recovering systemic proper motions (PMs) of targets (e.g. clusters or resolved galaxies) in Hubble Space Telescope (HST) fields with two epochs of observations by utilizing stars observed by Gaia as a foreground frame of reference.HST PM experiments have typically relied on the use of …
Search for LBVs in the Local Volume galaxies: study of two stars in NGC 1156
Vinokurov, A.; Solovyeva, Y.; Atapin, K. +7 more
We continue the search for luminous blue variables (LBVs) in Local Volume galaxies in order to study their fundamental parameters. In this paper, we report the discovery of two new LBVs in the dwarf irregular galaxy NGC 1156. Both stars exhibit spectral variability simultaneously with strong brightness variations: ΔRc = 0.84 ± 0.23…
X-ray non-detection of PSR J0250 + 5854
Esposito, P.; Rigoselli, M.; Stappers, B. W. +1 more
We conducted a deep XMM-Newton observing campaign on the 23.5-s radio pulsar PSR J0250 + 5854 in order to better understand the connection between long-period, radio-emitting neutron stars and their high-energy-emitting counterparts. No X-ray emission was detected resulting in an upper limit in the bolometric luminosity of PSR J0250 + 5854 of <…
Second-generation protoplanetary discs around evolved binaries: a high-resolution polarimetric view with SPHERE/IRDIS
Ertel, Steve; Van Winckel, Hans; Andrych, Kateryna +3 more
Binary post-asymptotic giant branch (post-AGB) stars are products of a poorly understood binary interaction process that occurs during the AGB phase. These systems comprise a post-AGB primary star, a main-sequence secondary companion and a stable circumbinary disc. Studying the structure and properties of these circumbinary discs is crucial for ga…
Extended radio emission in the galaxy cluster MS 0735.6+7421 detected with the Karl G. Jansky Very Large Array
Hlavacek-Larrondo, J.; van Weeren, R. J.; Haggard, D. +7 more
MS 0735.6+7421 (z = 0.216) is a massive cool core galaxy cluster hosting one of the most powerful active galactic nuclei (AGNs) outbursts known. The radio jets of the AGN have carved out an unusually large pair of X-ray cavities, each reaching a diameter of 200 kpc. This makes MS 0735.6+7421 a unique case to investigate active galactic nuclei feed…
Exploring the evolution of dust temperature using spectral energy distribution fitting in a large photometric survey
Stanway, Elizabeth R.; Jones, Gareth T.
Panchromatic analysis of galaxy spectral energy distributions, spanning from the ultraviolet to the far-infrared, probes not only the stellar population but also the properties of interstellar dust through its extinction and long-wavelength re-emission. However, little work has exploited the full power of such fitting to constrain the redshift evo…
XTE J1906+090: a persistent low-luminosity Be X-ray binary
Sidoli, L.; La Palombara, N.; Bird, A. J. +1 more
We present new results from INTEGRAL and Swift observations of the hitherto poorly studied and unidentified X-ray source XTE J1906+090. A bright hard X-ray outburst (luminosity of ~1036 erg s-1 above 20 keV) has been discovered with INTEGRAL observations in 2010, this being the fourth outburst ever detected from the source. S…
The MUSE Ultra Deep Field (MUDF). IV. A pair of X-ray weak quasars at the heart of two extended Lyα nebulae
Haardt, Francesco; Rafelski, Marc; Lusso, Elisabeta +10 more
We present the results obtained from follow-up observations of the MUSE Ultra Deep Field (MUDF) at X-ray energies with XMM-Newton. The MUDF is centred on a unique field with two bright, physically associated quasars at z ≃ 3.23, separated by ~500 kpc in projection. Both quasars are embedded within extended Lyα nebulae (${\gtrsim}100\,{\rm kpc}$ at…
The spectroscopic orbit of HD 168112 A,B in NGC 6604: another massive binary target for interferometry
Simón-Díaz, S.; Gamen, R.; Maíz Apellániz, J. +8 more
We present the first spectroscopic orbit of the O-type double-lined star HD 168112 A,B. We analyse 101 high-resolution optical spectra identifying the absorption lines of both components. The orbital solution presents a relatively long period, P = 513.52 ± 0.01 d, and a high eccentricity, e = 0.743 ± 0.005. The binary system consists of two very s…
The first X-ray look at SMSS J114447.77-430859.3: the most luminous quasar in the last 9 Gyr
Salvato, M.; Buchner, J.; Nandra, K. +18 more
SMSS J114447.77-430859.3 (z = 0.83) has been identified in the SkyMapper Southern Survey as the most luminous quasar in the last $\sim 9\, \rm Gyr$ . In this paper, we report on the eROSITA/Spectrum-Roentgen-Gamma (SRG) observations of the source from the eROSITA All Sky Survey, along with presenting results from recent monitoring performed using …