A5037297971- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- Spectroscopy and Laser Applications
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- History and Developments in Astronomy
- Methane Hydrates and Related Phenomena
- Ionosphere and magnetosphere dynamics
- Phase Equilibria and Thermodynamics
- Plant Water Relations and Carbon Dynamics
- CCD and CMOS Imaging Sensors
- Advanced Vision and Imaging
- Mathematics and Applications
- Social Skills and Education
- Photocathodes and Microchannel Plates
- Non-Invasive Vital Sign Monitoring
- Violence, Education, and Gender Studies
Universidad de Guanajuato
2012-2024
National Council for Scientific and Technological Development
1997-2001
Valongo Observatory
1998-2001
National Observatory
1998-2001
Observatoire des Sciences de l’Univers Terre Homme Environnement Temps Astronomie
2001
Brera Astronomical Observatory
2000
Financiadora de Estudos e Projetos
1999
Laboratório Nacional de Astrofísica
1997-1998
National Institute for Space Research
1995-1997
Cerro Tololo Inter-American Observatory
1997
A large sample of Abell clusters galaxies, selected for the likely presence a dominant galaxy, is used to study dynamical properties brightest cluster members (BCMs). From visual inspection Digitized Sky Survey images combined with redshift information we identify 1426 candidate BCMs located in 1221 different components associated 1169 clusters. This largest published so far such galaxies. our own morphological classification find that ∼92% are early-type galaxies and 48% cD type. We confirm...
We report Hubble Space Telescope imaging, obtained 155 and 449 days after the 2006 outburst of recurrent nova RS Ophiuchi, together with ground-based spectroscopic observations, from Observatorio Astron\'omico Nacional en San Pedro M\'artir, Baja California, M\'exico at Astrof\'isico Guillermo Haro, Cananea, Sonora, M\'exico. The observations first epoch were used as inputs to model geometry kinematic structure evolving Oph nebular remnant. find that modeled remnant comprises two distinct...
We have conducted a new spectroscopic survey to characterize the nature of nuclear activity in Hickson compact group (HCG) galaxies and establish its frequency. obtained intermediate-resolution optical spectroscopy for 200 member corrected underlying stellar population contamination using galaxy templates. Spectra 11 additional been acquired from ESO 6dF public archives, emission-line ratios taken literature 59 more galaxies. Here we present results our classification 270 galaxies, which...
We present the results of spectral classification 82 brightest galaxies in a sample 17 compact groups. verify that active galactic nuclei (AGNs) are preferentially located most early-type and luminous groups, as is usually observed field. But these AGNs also appear to be systematically concentrated toward central parts Our observations suggest correlation between activity types, morphologies, densities This consistent with scenario which groups evolve by interacting their environment...
We present the results of classification spectral activity types for 193 galaxies from a new sample 49 compact groups in southern hemisphere (SCGs). The SCGs represents selected automated fashion digitized galaxy catalog, covering an area ∼5200 deg2 around south Galactic pole. It is complete up to m ∼ 14.5 bj brightest group. This very well suited statistical studies properties as it unaffected by biases introduced visual selection methods. analysis SCG confirms previously obtained...
Using a sample of 91 galaxies distributed over 27 compact groups (CGs) galaxies, we define an index that allows us to quantify their level activity due active galactic nucleus (AGN) or star formation. By combining the mean with morphological type in group, are able evolutionary state groups. We find they span sequence correlates spatial configuration CG. distinguish three main types: A, B, and C. Type A CGs show predominantly low velocity dispersions rich late-type spirals formation harbor...
We present the results of a morphological study based on NIR images 25 galaxies, with different levels nuclear activity, in 8 Compact Groups Galaxies (CGs). perform independently two analysis: isophotal and asymmetries. The yielded by analysis are highly consistent. For first time, it is possible to show that deviations from pure ellipses produced inhomogeneous stellar mass distributions related galaxy interactions mergers. find evidence asymmetries 74% galaxies our sample. In 59% these...
To better constrain the hypotheses proposed to explain why only a few quasars are radio loud (RL), we compare characteristics of 1958 nearby $(z\le 0.3)$ SDSS quasars, covered by FIRST and NVSS surveys. Only 22\% RL with $\log(L_{1.4{\rm GHz}}) \ge 22.5$ W Hz$^{-1}$, majority being compact (C), weak sources (WRS), < 24.5$ Hz$^{-1}$. 15\% have extended morphologies: 3\% core jet (J), 2\% one lobe (L), 10\% two lobes (T), powerful (PRS), In general, higher bolometric luminosities ionisation...
In the course of an extensive campaign to measure radial velocities galaxies in a selected sample compact groups photometrically studied by de Carvalho et al., we report discovery system very rich starburst and active galactic nuclei. This is HCG 16 Hickson's catalog groups. The seven brightest form kinematical group with biweighted estimate mean velocity VBI = 3959 ± 66 km s-1, dispersion σBI 86 55 median radius ⟨R⟩ 0.197 Mpc, density ⟨D⟩ 217 Mpc-3, total absolute magnitude MB -22.1. From...
In the course of Pico dos Dias survey (PDS), we identified stellar-like object PDS 456 at coordinates α = 17h28m19796, δ -14°15'5587 (epoch 2000), with a relatively nearby (z 0.184) and bright (B 14.69) quasar. Its position Galactic l 104, b +112, near bulge Galaxy, may explain why it was not detected before. The optical spectrum is typical luminous quasar, showing broad (FWHM ~ 4000 km s-1) Hβ line, very intense Fe II lines, weak [O III] λ5007 line. associated to infrared source IRAS...
We present new K-band spectroscopy for a sample of 48 starburst galaxies, obtained using UKIRT in Hawaii. This constitutes fair the most common types galaxies found nearby Universe, containing with different morphologies, masses and metallicities, far-infrared luminosity LIR<1010 L⊙. The variety near-infrared spectral features shown by these implies bursts characteristics, which suggests that we survey star formation histories or at stages their burst evolution.
We discuss the nature of galaxies found in Pico dos Dias Survey (PDS) for young stellar objects. The PDS were selected from IRAS Point Source catalog. They have flux density moderate or high quality at 12, 25, and 60 μm spectral indices ranges -3.00 ≤ α(25, 12) + 0.35 -2.50 α(60, 25) +0.85. These criteria allowed detection 382 galaxies, which are a mixture starburst Seyfert galaxies. Most included catalog warm sources by de Grijp et al. remaining constitute homogeneous sample luminous [log F...
We present an analysis of the spectra 62 galaxies in 15 compact groups. The are classified into four activity classes: without emission, starburst galaxies, luminous AGNs (Seyfert and LINERs), low-luminosity (LLAGNs). star formation Hickson group (HCG) starbursts is more intense than normal spirals, but comparable to that observed starburst-nucleus (SBNGs) field. In general, HCG have mean solar gas metallicity do not follow metallicity-luminosity relation traced by early-type SBNGs field,...
We have determined the metallicity (O/H) and nitrogen abundance (N/O) of a sample 122,751 star-forming galaxies (SFGs) from Data Release 7 Sloan Digital Sky Survey. For all these we also their morphology obtained comprehensive picture star formation history (SFH) using spectral synthesis code STARLIGHT. The comparison chemical with SFH allows us to describe evolution SFGs in nearby universe (z ⩽ 0.25) manner consistent stellar populations morphologies. A high fraction (45%) our show an...
Abstract Using Sloan Digital Sky Survey (SDSS) spectra, we applied an automatic method to search for outflows (OFs) in three large samples of narrow-line active galactic nuclei (AGN) at low redshifts ( z < 0.4), separated into spectral activity classes: radio-loud galaxies (RGs), 15,793; radio-quiet Seyfert 2 AGN (Sy2), 18,585; and LINERs, 25,656. In general, the probability detecting OF decreases along sequence Sy1→Sy2→LINER/RG independently class, wind velocity, traced by W 80,...
ABRIDGED: We study the Star Formation History (SFH) of 210 galaxies members 55 Hickson Compact Groups (HCG) and 309 from Catalog Isolated Galaxies (CIG). The SFH traces variation star formation over lifetime a galaxy, yields consequently snapshot picture its formation. Comparing SFHs in these extremes galaxy density, allows us to determine main effects (CG) on galaxies. fit our spectra using spectral synthesis code STARLIGHT obtain stellar population contents mean ages HCG CIG three...
view Abstract Citations (26) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Photometric and Polarimetric Variability Mass-Loss Rate of the Massive Binary Wolf-Rayet Star HDE 311884 (WN6+O5:V) Moffat, Anthony F. J. ; Drissen, Laurent Robert, Carmelle Lamontagne, Robert Coziol, Roger Mousseau, Normand Niemela, Virpi S. Cerruti, Miguel A. Seggewiss, Wilhelm van Weeren, Niels polarimetric monitoring (W-R) + O-type binary system = WR 47 over many...
Based on a new survey of AGN activity in compact groups galaxies, we report remarkable deficiency broad-line AGNs as compared to narrow-line AGNs. The cause such could be related the average low luminosity CGs: 1039 ergs s−1. This result may imply lower accretion rates CG AGNs, making regions (BLRs) undetectable, or indicate genuine absence BLRs. Both phenomena are consistent with gas stripping through tidal interaction and dry mergers.
We discuss the nature and origin of nuclear activity observed in a sample 292 SDSS narrow-emission-line galaxies, considered to have formed evolved isolation. All these galaxies are spiral like show some kind activity. The fraction Narrow Line AGNs (NLAGNs) Transition type Objects (TOs; NLAGN with circumnuclear star formation) is relatively high, amounting 64% galaxies. There definite trend for NLAGNs appear early-type spirals, while forming TOs found later-type spirals. verify that...
Using the Multi-Element Radio-Linked Interferometer Network (MERLIN), we have acquired a high spatial resolution spectral image of OH megamaser (OHMM) in nearby starburst ‘galaxy’ known as IIZw 096. We also optical B, V, R, I and Hα images with 1.5-m telescope San Pedro Mártir. By comparing MERLIN observations Hubble archive images, are able to pinpoint location maser emission this object; OHMM seems be associated faint reddish, compact-round structure (a few hundred parsecs) off-centre...
Using a new color-color diagnostic diagram in the mid infrared built from WISE data, MIRDD, we compare narrow emission-line galaxies (NELGs) that exhibit different activity types (star-forming galaxies, SFGs, and AGNs, i.e.,LINERs, Sy2s TOs), with broad-line AGNs (QSOs Sy1s) BL Lac objects at low redshift ($z \le 0.25$). We show occupy MIRDD same region as LINERs, whereas QSOs Sy1s an intermediate region, between LINERs Sy2s.In these trace sequence can be reproduced by power law, $F_\nu =...
view Abstract Citations (30) References (46) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Montreal Blue Galaxy Survey. 1. First List of Ultraviolet- Bright Candidate Coziol, Roger ; Demers, Serge Pena, Miriam Torres-Peimbert, Silvia Fontaine, G. Wesemael, F. Lamontagne, R. We describe and present the first results a UV-bright galaxy survey using Montreal-Cambridge-Tololo (MCT) plate collection. Visual inspection 57 CTIO Curtis Schmidt plates, covering...
We present and discuss the second list of Montreal Blue Galaxy survey. Following inspection 71 plates, we found 237 new candidates with B < 15.5. 73 percent them are also detected by IRAS. Spectrophotometry was carried out, at medium resolution, for a subset 40 objects leading to identification three AGNs producing 13 radial velocities. Spectral classification our confirms previous finding !hat majority starburst nucleus galaxies similar studied Balzano [ApJ, 268, 602(1983)]. Our survey...
The metallicities derived from spectroscopic observations of a sample Starburst Nucleus Galaxies (SBNGs) are compared to those several other types galaxies (normal giant galaxies, Irregular and HII galaxies) drawn the literature. SBNGs deficient in metals with respect normal same morphological type, suggesting that - still process formation. Breaking into early-types (Sb earlier) late-types reveals former seem follow linear luminosity-metallicity relation as irregular elliptical whereas...