Search Publications
Stellar clusters in the nuclear regions of AGN with the Advanced Camera for Surveys
Pérez, Enrique; Schmitt, Henrique R.; Cid Fernandes, Roberto +2 more
We explore the role of star clusters in the nuclear regions of galaxies through their connection with active galactic nuclei (AGN). Nuclear star clusters (NCs) are conspicuous in the centers of most nearby galaxies, all along the Hubble sequence. These clusters are probably the faint-end distribution of the central supermassive black holes (SMBHs)…
Gas kinematics in the halo of the warm ULIRG PKS1345+12
Tadhunter, Clive N.; González Delgado, Rosa M.; Rodríguez Zaurín, Javier +1 more
We use long-slit spectra taken with the William Herschel Telescope on La Palma and high-resolution Hubble Space Telescope imaging to study the gas kinematic in the halo of the ultraluminous infrared/radio galaxy PKS1345+12 ( z=0.122). Our long-slit spectra show line splitting at the locations of massive star clusters ( 106<M_{SSC}^{Y…
Star-formation modes in the solar neighborhood
Alfaro, Emilio J.; Elias, Federico; Cabrera-Caño, Jesús
We perform a study into the spatial and kinematical distribution of young open clusters in the solar neighborhood, distinguishing between Gould Belt and local Galactic disk members. We use a previous estimate of the structural parameters of both systems obtained from a sample of O to B6 stars from Hipparcos. The two star-forming regions that domin…
Star formation in NGC5471
Pérez, Enrique; Cerviño, Miguel; Díaz, Ángeles I. +2 more
We present a study of the star formation in the giant HII region NGC5471 in the outskirts of M101. We have performed integrated photometry of the mean emission knots. Stellar population analysis with the code chorizos is compatible with the hypothesis that these regions have at least two different populations. The color–magnitude diagram of the re…
The evolution of star clusters: the resolved-star approach
Calzetti, Daniela; Pellerin, Anne; Harris, Jason +1 more
We present the first results of a new technique to detect, locate, and characterize young dissolving star clusters. Using Hubble Space Telescope/Advanced Camera for Surveys archival images of the nearby galaxy IC2574, we performed stellar PSF photometry and selected the most massive stars as our first test sample. We used a group-finding algorithm…
Properties of the ionised gas of circumnuclear star-forming regions in early-type spirals
Terlevich, Roberto; Terlevich, Elena; Díaz, Ángeles I. +1 more
A study of circumnuclear star-forming regions (CNSFRs) in several early-type spirals has been carried out in order to investigate their main properties: stellar and gas kinematics, dynamical masses, ionising stellar masses, chemical abundances and other properties of the ionised gas. Both high resolution (R∼20,000) and moderate resolution (R∼5000)…
Metal-line system survey: characterizing the low-redshift IGM
Cooksey, Kathy L.; Prochaska, Jason X.
The low-redshift IGM probes the last ten billion years of metal enrichment from galactic feedback processes. We present preliminary results from a survey of intergalactic metal-line absorption systems in archival HST STIS, GHRS, and FUSE spectra of ≈50 z≲2 UV-bright objects. We summarize the detailed analysis of one sightline (PKS1302–102, zQ…