Search Publications
A deeper solution to the actual geometry of CCD mosaic chips
Vienne, A.; Lin, F. R.; Peng, Q. Y. +2 more
Context. For charge-coupled device (CCD) mosaic chips in the focal plane of a large telescope, the unification for all the measurements of each chip is vital to some scientific projects, such as deep astrometric standards or construction for deeper images that can also seamlessly cover a larger area of the sky. A key part of the reduction involves…
Cloud motion and magnetic fields: Four clouds in the Cepheus Flare region
Maheswar, G.; Dib, S.; Sharma, E.
Context. The Cepheus Flare region consists of a group of dark cloud complexes that are currently active in star formation.
Aims: The aim of this work is to estimate the motions of four clouds, namely L1147/1158, L1172/1174, L1228, and L1251, located at relatively high Galactic latitude (b > 14°) in the Cepheus Flare region. We study the re…
Rapid early gas accretion for the inner Galactic disc. A case for a short accretion timescale
Khoperskov, Sergey; Di Matteo, Paola; Katz, David +3 more
Context. Recent observations of the Milky Way and galaxies at high redshifts suggest that galaxy discs were already in place soon after the Big Bang. While the gas infall history of the Milky Way in the inner disc has long been assumed to be characterised by a short accretion timescale, this has not been directly constrained using observations.
High-resolution images of two wiggling stellar jets, MHO 1502 and MHO 2147, obtained with GSAOI+GeMS
Gómez, M.; Saldaño, H. P.; Kalari, V. M. +3 more
Aims: We investigated the possible cause-effect relation between the wiggling shape of two stellar jets, MHO 1502 and MHO 2147, and the potential binarity of the respective driving stars.
Methods: We present high-angular-resolution H2 (2.122 µm) and K-band images obtained with the Gemini South Adaptive Optics Imager (GSA…
Cloud-cloud collision and star formation in G323.18+0.15
Li, Dalei; Tang, Xindi; Zhou, Jianjun +8 more
We studied the cloud-cloud collision candidate G323.18+0.15 based on signatures of induced filaments, clumps, and star formation. We used archival molecular spectrum line data from the SEDIGISM 13CO (J = 2−1) survey, from the Mopra southern Galactic plane CO survey, and infrared to radio data from the GLIMPSE, MIPS, Hi-GAL, and SGPS sur…
Pre-main sequence stars in LH 91
Panagia, N.; Beccari, G.; De Marchi, G. +3 more
Aims: We study the accretion properties of pre-main sequence (PMS) low-mass stars in the LH 91 association within the Large Magellanic Clouds.
Methods: Using optical multiband photometry obtained with the Hubble Space Telescope, we identify 75 candidates showing Hα excess emission above the 3σ level with equivalent width EWHα …
Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods. II. Population inference
Paltani, Stéphane; Salvato, Mara; Eckert, Dominique +1 more
We present a new Bayesian method for reconstructing the parent distributions of X-ray spectral parameters of active galactic nuclei (AGN) in large surveys. The method uses the probability distribution function (PDF) of posteriors obtained by fitting a consistent physical model to each object with a Bayesian method. The PDFs are often broadly distr…
What is the origin of the stacked radio emission in radio-undetected quasars?. Insights from a radio-infrared image stacking analysis
Retana-Montenegro, E.
Radio emission in the brightest radio quasars can be attributed to processes inherent to active galactic nuclei (AGN) powered by super massive black holes (SMBHs), while the physical origins of the radio fluxes in quasars without radio detections have not been established with full certainly. Deep radio surveys carried out with the Low Frequency A…
The dynamical state of RXCJ1230.7+3439: A multi-substructured merging galaxy cluster
Böhringer, H.; Chon, G.; Barrena, R.
We analyse the kinematical and dynamical state of the galaxy cluster RXCJ1230.7+3439 (RXCJ1230), at z = 0.332 using 93 new spectroscopic redshifts of galaxies acquired at the Telescopio Nazionale Galileo and from SDSS DR16 public data. We study the density galaxy distribution retrieved from photometric SDSS multiband data and find that RXCJ1230 ap…
The nature of the X-ray sources constituting the 6.7 keV Galactic ridge emission
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
We reanalyze the deep Chandra X-ray observations near the Galactic center and show that reliable identifications of X-ray sources can be obtained with the Gaia EDR3 data to investigate which types of stellar sources are responsible for the X-ray emission observed from the Galactic ridge (GRXE). In the central 3 arcmin region 318 X-ray sources are …