Search Publications
Multiwavelength detection of an ongoing FUOr-type outburst on a low-mass YSO
Minniti, D.; Bayo, A.; Alonso-García, J. +13 more
During the pre-main-sequence evolution, Young Stellar Objects (YSOs) assemble most of their mass during the episodic accretion process. The rarely seen FUOr-type events are valuable laboratories to investigate the outbursting nature of YSOs. Here, we present multiwavelength detection of a high-amplitude eruptive source in the young open cluster Vd…
Growing local arm inferred by the breathing motion
Kawata, Daisuke; Fujii, Michiko S.; Baba, Junichi +1 more
Theoretical models of spiral arms suggest that the spiral arms provoke a vertical bulk motion in disc stars. By analysing the breathing motion, a coherent asymmetric vertical motion around the mid-plane of the Milky Way disc, with Gaia DR3, we found that a compressing breathing motion presents along the Local arm. On the other hand, with an N-body…
Accretion and obscuration in merger-dominated luminous red quasars
Piconcelli, Enrico; Lacy, Mark; LaMassa, Stephanie +2 more
We present an analysis of the X-ray properties of 10 luminous, dust-reddened quasars from the FIRST-2MASS (F2M) survey based on new and archival Chandra observations. These systems are interpreted to be young, transitional objects predicted by merger-driven models of quasar/galaxy co-evolution. The sources have been well studied from the optical t…
The stellar mass function of quiescent galaxies in 2 < z < 2.5 protoclusters
Cooper, M. C.; Muzzin, Adam; Forrest, Ben +21 more
We present an analysis of the galaxy stellar mass function (SMF) of 14 known protoclusters between 2.0 < z < 2.5 in the COSMOS field, down to a mass limit of 109.5 M⊙. We use existing photometric redshifts with a statistical background subtraction, and consider star-forming and quiescent galaxies identified from (NUV - …
The Giant Molecular Cloud G148.24+00.41: gas properties, kinematics, and cluster formation at the nexus of filamentary flows
Zavagno, A.; Samal, M. R.; Ojha, D. K. +9 more
Filamentary flows towards the centre of molecular clouds have been recognized as a crucial process in the formation and evolution of stellar clusters. In this paper, we present a comprehensive observational study that investigates the gas properties and kinematics of the Giant Molecular Cloud G148.24+00.41 using the observations of CO (1-0) isotop…
Warp and flare of the old Galactic disc as traced by the red clump stars
Ganesh, Shashikiran; Schultheis, Mathias; Uppal, Namita
Our study aims to investigate the outer disc structure of the Milky Way Galaxy using the red clump (RC) stars. We analysed the distribution of the largest sample of RC stars to date, homogeneously covering the entire Galactic plane in the range of 40° ≤ ℓ ≤ 340° and -10° ≤ b ≤ +10°. This sample allows us to model the RC star distribution in the Ga…
An optically thin view of the flaring chromosphere: non-thermal widths in a chromospheric condensation during an X-class solar flare
Kowalski, Adam F.; Kerr, Graham S.; Allred, Joel C. +2 more
The bulk of solar flare energy is deposited in the chromosphere. Flare ribbons and footpoints in the chromosphere therefore offer great diagnostic potential of flare energy release and transport processes. High-quality observations from the Interface Region Imaging Spectrograph (IRIS) spacecraft have transformed our view of the Sun's atmospheric r…
The extreme coronal line emitter AT 2022fpx: varying optical polarization properties and late-time X-ray flare
Reynolds, Thomas M.; Liodakis, Ioannis; Carbajo-Hijarrubia, Juan +8 more
Supermassive black holes disrupt passing stars, producing outbursts called tidal disruption events (TDEs). TDEs have recently gained attention due to their unique dynamics and emission processes, which are still not fully understood. Especially, the so-called optical TDEs are of interest as they often exhibit delayed or obscured X-ray emission fro…
Behind the mask: can HARMONI@ELT detect biosignatures in the reflected light of Proxima b?
Vigan, Arthur; Carlotti, Alexis; Pereira-Santaella, Miguel +7 more
Proxima b is a rocky exoplanet in the habitable zone of the nearest star system and a key test case in the search for extraterrestrial life. Here, we investigate the characterization of a potential Earth-like atmosphere around Proxima b in reflected light via molecule mapping, combining high-resolution spectroscopy (HRS) and high contrast imaging,…
Revealing the chemical structure of the Magellanic Clouds with APOGEE. I. Calculating individual stellar ages of RGB stars in the Large Magellanic Cloud
Choi, Yumi; Cunha, Katia; Smith, Verne V. +12 more
Stellar ages are critical for understanding the temporal evolution of a galaxy. We calculate the ages of over 6000 red giant branch stars in the Large Magellanic Cloud (LMC) observed with SDSS-IV / APOGEE-S. Ages are derived using multiband photometry, spectroscopic parameters (