A5034805657- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Silicone and Siloxane Chemistry
- Historical Astronomy and Related Studies
- Astrophysical Phenomena and Observations
- Tribology and Lubrication Engineering
Universidad de Guadalajara
2016-2024
Instituto de Astrofísica de Andalucía
2014-2015
Evolved stars such as asymptotic giant branch (AGB), post-AGB stars, proto-planetary nebulae (proto-PNe), and planetary (PNe) show rings arcs around them their nebular shells. We have searched for these morphological features in optical Hubble Space Telescope mid-infrared Spitzer images of ∼650 proto-PNe PNe discovered 29 new sources. Adding those to previous detections, we derive a frequency occurrence ≃8 per cent. All been processed remove the underlying envelope emission enhance outer...
Mid-IR observations of planetary nebulae (PNe) have revealed diffuse emission associated to their main nebular shells and outer envelopes or haloes. The interpretation this is uncertain because the broad-band mid-IR images may include contributions different components. In particular, Spitzer IRAC 8 {\mu}m images, that best reveal these features, can not only H2 lines, but also those ionic species, PAH thermal dust continuum emission. To investigate nature detected in a sample 10 PNe, we...
We analyze the expansion of hydrogen-poor knots and filaments in born-again planetary nebulae A30 A78 based on Hubble Space Telescope (HST) images obtained almost 20 yr apart. The proper motion these features generally increases with distance to central star, but fractional decreases, i.e., is not homologous. As a result, there unique age, which estimated be 610-950 for 600-1140 A78. have experienced complex dynamical processes: current fast stellar wind mass loaded by material ablated from...
We present near-IR K-band intermediate-dispersion spatially-resolved spectroscopic observations of a limited sample bipolar planetary nebulae (PNe). The spectra have been used to determine the excitation mechanism H2 molecule using standard line ratios diagnostics. is predominantly shock-excited in PNe with broad equatorial rings, whereas narrow waists either UV at their cores (e.g., Hb 12) or shock-excitation lobes M1-92). among ring found be correlated emission 1-0 S(1) brighter than...
We have analysed optical, near-, and mid-IR images of the bright planetary nebula (PN) IC 418. These probe unambiguously for first time a number low surface brightness structures shells around main nebula, including radial filaments or rays, system three concentric rings, two detached haloes with sizes ~ 150" 220"\times250", respectively. The is slightly off-centered respect to elliptical outer halo. time-lapse between 10,000-50,000 yr, whereas rings 630 yr. emphasize advantages near-...
We present the XMM-Newton discovery of X-ray emission from planetary nebula (PN) A78, second born-again PN detected in X-rays apart A30. These two PNe share similar spectral and morphological characteristics: they harbor diffuse soft associated with interaction between H-poor ejecta current fast stellar wind a point-like source at position central star (CSPN). analysis CSPN, using for first time an NLTE code expanding atmospheres that takes line blanketing into account UV optical spectra....
We have obtained 24 μm imaging, profiles and fluxes for 224 planetary nebulae (PNe) lying within the limits of Galactic survey undertaken with Multiband Imaging Photometer Spitzer (MIPSGAL). It is noted that most PNe having extended emission also possess circular morphologies, suggesting derives from cool grains located Asymptotic Giant Branch (AGB) mass-loss regimes. Certain these haloes are found to a surface brightness fall-off which may be consistent secularly invariant mass loss...
We provide mid-infrared (MIR) imaging, photometry and profiles for the Galactic supernova remnants (SNRs) G001.0-00.1, G355.9-02.5, G355.6-00.0, W28 based upon data deriving Legacy Infrared Midplane Survey Extraordinaire (GLIMPSE). All of sources show evidence interaction with interstellar medium (ISM), leading to curved frontal structures apparent voids in ISM. An analysis spectral energy distributions (SEDs) Class I young stellar objects (YSOs) within north-westerly region W28, density...
NGC 4660, in the Virgo cluster, is a well-studied elliptical galaxy which has strong disk component (D/T about 0.2-0.3). The central regions including have stellar populations with ages 12-13 Gyr from SAURON studies. However we report discovery of long narrow tidal filament associated deep co-added Schmidt plate images and CCD frames, implying that undergone interaction merger within last few Gyr. relative narrowness implies wet at least one spiral involved, but current state system little...
The supernova remnant (SNR) G357.7+0.3 appears to have caused considerable shredding of the local interstellar medium (ISM), leading formation multiple cloud fragments having bright rims and cometary structures. We investigate five these regions using mid-infrared (MIR) imaging photometry deriving from Spitzer Space Telescope (SST), as well 2MASS near-infrared all sky survey, Mid-Course Science Experiment (MSX), Multiband Imaging Photometer for (MIPSGAL) survey Galactic plane. It is noted...
We utilized photometric data from the space telescope AKARI to identify potential planetary nebulae (PNe) and proto-planetary (PPNe) candidates. Using color-color diagram, we found a region with high concentration of established PNe PPNe, comprising about 95% objects. Based on this, identified 67 objects within this that lack definitive classification in existing literature, suggesting they are promising conducted Spectral Energy Distribution (SED) analysis morphological...
ABSTRACT Motivated by the challenges of calculating dynamical masses late-type galaxies (LTGs) and enormous amount data from Sloan Digital Sky Survey (SDSS), we calculate virial a sample approximately 126 000 LTGs sixteenth release SDSS. The mass estimations were made considering Newtonian mechanics, equilibrium velocity dispersion stars gas. procedure gave as result seven for each galaxy. calculated calibrated using spiral with rotation curves. Considering results calibration, find that...
We provide mid- and far-infrared photometry of 857 Galactic planetary nebulae (PNe) using data derived from the AKARI All-Sky Survey. These include fluxes at 9 18 μm obtained with Infrared Camera (IRC), 65, 90, 140 160 far-Infrared Surveyor (FIS). It is noted that IR luminosities youngest PNe are comparable to total central stars, subsequently decline ~ 5102 L where D > 0.08 pc. This consistent an evolution dust opacities, appreciable absorption in young proto-PNe. also note whilst there...