Search Publications
Comparing the host galaxy ages of X-ray selected AGN in COSMOS. Obscured AGN are associated with older galaxies
Georgantopoulos, I.; Lanzuisi, G.; Mountrichas, G. +3 more
We explore the properties of the host galaxies of X-ray selected AGN in the COSMOS field using the Chandra Legacy sample and the LEGA-C survey VLT optical spectra. Our main goal is to compare the relative ages of the host galaxies of the obscured and unobscured AGN by means of the calcium break Dn(4000) and the Hδ Balmer line…
A characterization of ASAS-SN core-collapse supernova environments with VLT+MUSE. I. Sample selection, analysis of local environments, and correlations with light curve properties
Lyman, J. D.; Galbany, L.; Gutiérrez, C. P. +17 more
Context. The analysis of core-collapse supernova (CCSN) environments can provide important information on the life cycle of massive stars and constrain the progenitor properties of these powerful explosions. The MUSE instrument at the Very Large Telescope (VLT) enables detailed local environment constraints of the progenitors of large samples of C…
Spitzer thermal phase curve of WASP-121 b
Morello, G.; Lagage, P. -O.; Tan, J. C. +2 more
Aims: We analyse unpublished Spitzer observations of the thermal phase-curve of WASP-121 b, a benchmark ultra-hot Jupiter.
Methods: We adopted the wavelet pixel-independent component analysis technique to remove challenging instrumental systematic effects in these datasets and we fit them simultaneously with parametric light-curve models…
Multiwavelength Observations of a New Redback Millisecond Pulsar 4FGL J1910.7-5320
Strader, Jay; Kong, Albert K. H.; Aydi, Elias +9 more
We present the study of multiwavelength observations of an unidentified Fermi Large Area Telescope (LAT) source, 4FGL J1910.7-5320, a new candidate redback millisecond pulsar binary. In the 4FGL 95% error region of 4FGL J1910.7-5320, we find a possible binary with a 8.36 hr orbital period from the Catalina Real-Time Transient Survey, confirmed by …
The volume density of giant low surface brightness galaxies
Galaz, Gaspar; Chilingarian, Igor V.; Saburova, Anna S. +5 more
Rare giant low surface brightness galaxies (gLSBGs) act as a stress test for the current galaxy formation paradigm. To answer the question 'How rare are they?', we estimate their volume density in the local Universe. A visual inspection of 120 deg2 covered by deep Subaru Hyper Suprime-Cam data was performed independently by four team me…
Spectroscopy of the supernova H0pe host galaxy at redshift 1.78
Ryan, R. E.; Yun, M. S.; Dole, H. +42 more
Supernova (SN) H0pe was discovered as a new transient in James Webb Space Telescope (JWST) NIRCam images of the galaxy cluster
UNIONS: The impact of systematic errors on weak-lensing peak counts
Gavazzi, Raphaël; Hudson, Michael J.; Kilbinger, Martin +6 more
Context. The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is an ongoing deep photometric multiband survey of the northern sky. As part of UNIONS, the Canada-France Imaging Survey (CFIS) provides r-band data, which we use to study weak-lensing peak counts for cosmological inference.
Aims: We assess systematic effects for weak-len…
A tale of a tail: a tidally disrupting ultra-diffuse galaxy in the M81 group
Cuillandre, Jean-Charles; Arimoto, Nobuo; Okamoto, Sakurako +4 more
We present the discovery of a giant tidal tail of stars associated with F8D1, the closest known example of an ultra-diffuse galaxy (UDG). F8D1 sits in a region of the sky heavily contaminated by Galactic cirrus and has been poorly studied since its discovery two decades ago. The tidal feature was revealed in a deep map of resolved red giant branch…
The GRAVITY young stellar object survey. X. Probing the inner disk and magnetospheric accretion region of CI Tau
Lutz, D.; Sturm, E.; Tacconi, L. J. +52 more
Context. T Tauri stars are known to be the cradle of planet formation. Most exoplanets discovered to date lie at the very inner part of the circumstellar disk (<1 au). The innermost scale of young stellar objects is therefore a compelling region to be addressed, and long-baseline interferometry is a key technique to unveil their mysteries.
…
Universality in the random walk structure function of luminous quasi-stellar objects
Tang, Ji-Jia; Wolf, Christian; Tonry, John
Rapidly growing black holes are surrounded by accretion disks that make them the brightest objects in the Universe. Their brightness is known to be variable, but the causes of this are not implied by simple disk models and still debated. Due to the small size of accretion disks and their great distance, there are no resolved images addressing the …