Search Publications
SDSS-IV MaNGA: Identification and multiwavelength properties of Type-1 AGN in the DR15 sample
Negrete, C. A.; Hernández-Toledo, H. M.; Ibarra-Medel, H. +2 more
We present a method to identify type-1 active galactic nuclei (AGNs) in the central 3 arcsec integrated spectra of galaxies in the MaNGA DR15 sample. It is based on flux ratios estimates in spectral bands flanking the expected H α broad component H αBC. The high signal-to-noise ratio obtained (mean S/N = 84) permits the identification o…
The changing-look AGN NGC 1566 in quiescence with XMM-Newton: a nuclear starburst and an AGN competing in power?
Santos-Lleó, M.; Ballo, L.; Jiménez Bailón, E. +8 more
Star formation accretion on to the super massive black holes (SMBHs) and feedback processes link the evolution of galaxies with their SMBHs. X-ray observations in the imaging and spectral regime have revealed to be an important tool to study the connection between nuclear activity and circumnuclear star formation in nearby active galactic nuclei (…
Gamma-ray light curves and spectra of classical novae
Siegert, Thomas; Leung, Shing-Chi
The nucleosynthesis in classical novae, in particular that of radioactive isotopes, is directly measurable by its γ-ray signature. Despite decades of observations, MeV γ-rays from novae have never been detected - neither individually at the time of the explosion, nor as a result of radioactive decay, nor the diffuse Galactic emission from the nova…
A new method to correct for host star variability in multiepoch observations of exoplanet transmission spectra
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +5 more
Transmission spectra of exoplanets orbiting active stars suffer from wavelength-dependent effects due to stellar photospheric heterogeneity. WASP-19b, an ultra-hot Jupiter (Teq ~ 2100 K), is one such strongly irradiated gas-giant orbiting an active solar-type star. We present optical (520-900 nm) transmission spectra of WASP-19b obtaine…
The Three Hundred project: dissecting the Fundamental Plane of galaxy clusters up to z = 1
Cui, Weiguang; Umetsu, Keiichi; Meneghetti, Massimo +2 more
We perform a systematic study of the recently discovered Fundamental Plane of galaxy clusters (CFP) using ~250 simulated clusters from The Three Hundred project, focusing on the stability of the plane against different temperature definitions and its dependence on the dynamical relaxation state of clusters. The CFP is characterized by $T\propto M_…
On the precision of full-spectrum fitting of simple stellar populations - IV. A systematic comparison with results from colour-magnitude diagrams
Goudfrooij, Paul; Asa'd, Randa; As'ad, A. M.
In this fourth paper of a series on the precision of ages of stellar populations obtained through the full-spectrum fitting technique, we present a first systematic analysis that compares the age, metallicity, and reddening of star clusters obtained from resolved and unresolved data [namely colour-magnitude diagrams (CMDs) and integrated-light spe…
Gas inflows in the polar ring of NGC 4111: the birth of an AGN
Lützgendorf, Nora; Ma, Chung-Pei; Gebhardt, Karl +14 more
We have used Hubble Space Telescope (HST) images, SAURON Integral Field Spectroscopy (IFS), and adaptative optics assisted Gemini NIFS near-infrared K-band IFS to map the stellar and gas distribution, excitation and kinematics of the inner few kpc of the nearby edge-on S0 galaxy NGC 4111. The HST images map its ≈450 pc diameter dusty polar ring, w…
YOUNG Star detrending for Transiting Exoplanet Recovery (YOUNGSTER) - II. Using self-organizing maps to explore young star variability in sectors 1-13 of TESS data
Armstrong, David J.; Pollacco, Don; Battley, Matthew P.
Young exoplanets and their corresponding host stars are fascinating laboratories for constraining the time-scale of planetary evolution and planet-star interactions. However, because young stars are typically much more active than the older population, in order to discover more young exoplanets, greater knowledge of the wide array of young star va…
IFU observations of the inner 200 pc of NGC 4546: gas rotation, non-circular motions, and ionized outflows
Riffel, Rogemar A.; Heckler, Kelly F.; Ricci, Tiago V.
We present a detailed analysis of the ionized gas distribution and kinematics in the inner ~ 200 pc of NGC 4546, host of a low-luminosity active galactic nucleus (LLAGN). Using GMOS-IFU observations, with a spectral coverage of 4736-6806 Å and an angular resolution of 0.7 arcsec, we confirm that the nuclear emission is consistent with photoionizat…
The local universe in the era of large surveys - II. multi-wavelength characterization of activity in nearby S0 galaxies
del Olmo, A.; Jiménez-Palau, C.; Solanes, J. M. +2 more
This is the second paper in a series using data from tens of thousands S0 galaxies of the local Universe (z ≲ 0.1) retrieved from the NASA-Sloan Atlas. It builds on the outcomes of the previous work, which introduced a new classification scheme for these objects based on the principal component analysis (PCA) of their optical spectrum and its proj…