Search Publications
Cloud-scale radio surveys of star formation and feedback in Triangulum Galaxy M 33: VLA observations
Menten, K. M.; Braine, J.; Beck, R. +11 more
Studying the interplay between massive star formation and the interstellar medium (ISM) is paramount to understand the evolution of galaxies. Radio continuum (RC) emission serves as an extinction-free tracer of both massive star formation and the energetic components of the ISM. We present a multiband RC survey of the Local Group galaxy M 33 down …
The high-velocity clouds above the disc of the outer Milky Way: misty precipitating gas in a region roiled by stellar streams
Tripp, Todd M.
The high-velocity clouds (HVCs) in the outer Milky Way at 20° < l < 190° have similar spatial locations, metallicities, and kinematics. Moreover, their locations and kinematics are coincident with several extraplanar stellar streams. The HVC origins may be connected to the stellar streams, either stripped directly from them or precipitated b…
Probing infrared excess connection with Li enhancement among red clump giants
Reddy, Bacham E.; Muthumariappan, C.; Mallick, Anohita
We have performed a search among low-mass red giants for finding evidence for merger scenario for triggering He-flash and subsequent Li enhancement. We chose a sample of red giants from GALAH survey with well-measured Li abundances, and near- and mid-IR fluxes from 2MASS and WISE surveys, respectively. The sample contains 418 cool red clump giants…
The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel
Massardi, M.; Enia, A. F. M.; Negrello, M. +6 more
We investigate the radio/far-infrared (FIR) correlation for a sample of 28 bright high-redshift (1 ≲ z ≲ 4) star-forming galaxies selected in the FIR from the Herschel-ATLAS fields as candidates to be strongly gravitationally lensed. The radio information comes either from high sensitivity dedicated Australia Telescope Compact Array observations a…
Probing computational methodologies in predicting mid-infrared spectra for large polycyclic aromatic hydrocarbons
Rigopoulou, D.; García-Bernete, I.; Roche, P. F. +3 more
We extend the prediction of vibrational spectra to large sized polycyclic aromatic hydrocarbon (PAH) molecules comprising up to ~1500 carbon atoms by evaluating the efficiency of several computational chemistry methodologies. We employ classical mechanics methods (Amber and Gaff) with improved atomic point charges, semi-empirical (PM3, and density…
Constraining density and metallicity of the Milky Way's hot gas halo from O VII spectra and ram-pressure stripping
Martynenko, Nickolay
Milky Way's (MW) hot gaseous halo extends up to the Galactic virial radius (~200 kpc) and contains a significant component of baryon mass of the Galaxy. The halo properties can be constrained from X-ray spectroscopic observations and from satellite galaxies' ram-pressure stripping studies. Results of the former method crucially depend on the gas m…
Synthetic photometry of OB star clusters with stochastically sampled IMFs: analysis of models and HST observations
Grebel, Eva K.; Charlot, Stephane; Wofford, Aida +13 more
We present a pilot library of synthetic NUV, U, B, V, and I photometry of star clusters with stochastically sampled IMFs and ionized gas for initial masses, Mi = 103, 104, and 105 M⊙; t = 1, 3, 4, and 8 Myr; Z = 0.014 and Z = 0.002; and log(US) = -2 and -3. We compare the library wi…
Low X-ray surface brightness clusters: implications on the scatter of the M-T and L-T relations
Andreon, S.; Moretti, A.; Trinchieri, G.
We aim at studying scaling relations of a small but well-defined sample of galaxy clusters that includes the recently discovered class of objects that are X-ray faint for their mass. These clusters have an average low X-ray surface brightness, a low gas fraction, and are underrepresented (by a factor of 10) in X-ray surveys or entirely absent in S…
Measuring the smearing of the Galactic 511-keV signal: positron propagation or supernova kicks?
Calore, Francesca; Siegert, Thomas; Panther, Fiona H. +4 more
We use 15 years of $\gamma$-ray data from INTEGRAL/SPI in a refined investigation of the morphology of the Galactic bulge positron annihilation signal. Our spatial analysis confirms that the signal traces the old stellar population in the bulge and reveals for the first time that it traces the boxy bulge and nuclear stellar bulge. Using a 3D smoot…
First evidence of a collision between two unrelated open clusters in the Milky Way
Piatti, Andrés E.; Malhan, Khyati
We report the first evidence of an ongoing collision between two star clusters in our Galaxy, namely IC 4665 and Collinder 350. These are open clusters located at a distance of ~330 pc from the Sun and ~100 pc above the Galactic plane, and they both have prograde motions with only a small difference in their velocities (Collinder 350 moves $\sim 5…