Browsing by Author "Rojas, A. F."
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- ItemAccurate classification of 75 counterparts of objects detected in the 54-month Palermo Swift/BAT hard X-ray catalogue(2014) Parisi, P.; Masetti, N.; Rojas, A. F.; Jiménez Bailón, E.; Chavushyan, V.; Palazzi, E.; Bassani, L.; Bazzano, A.; Bird, A. J.; Galaz, Gaspar; Minniti, D.; Morelli, L.; Ubertini, P.; Parisi, P.; Masetti, N.; Rojas, A. F.; Jiménez Bailón, E.; Chavushyan, V.; Palazzi, E.; Bassani, L.; Bazzano, A.; Bird, A. J.; Galaz, Gaspar; Minniti, D.; Morelli, L.; Ubertini, P.
- ItemBASS XXXI: Outflow scaling relations in low redshift X-ray AGN host galaxies with MUSE(2022) Kakkad, D.; Sani, E.; Rojas, A. F.; Mallmann, Nicolas D.; Veilleux, S.; Bauer, Franz E.; Ricci, F.; Mushotzky, R.; Koss, M.; Ricci, C.; Treister, E.; Privon, George C.; Nguyen, N.; Bär, R.; Harrison, F.; Oh, K.; Powell, M.; Riffel, R.; Stern, D.; Trakhtenbrot, B.; Urry, C. M.Ionized gas kinematics provide crucial evidence of the impact that active galactic nuclei (AGNs) have in regulating star formation in their host galaxies. Although the presence of outflows in AGN host galaxies has been firmly established, the calculation of outflow properties such as mass outflow rates and kinetic energy remains challenging. We present the [O iii]lambda 5007 ionized gas outflow properties of 22 z<0.1 X-ray AGN, derived from the BAT AGN Spectroscopic Survey using MUSE/VLT. With an average spatial resolution of 1 arcsec (0.1-1.2 kpc), the observations resolve the ionized gas clouds down to sub-kiloparsec scales. Resolved maps show that the [O iii] velocity dispersion is, on average, higher in regions ionized by the AGN, compared to star formation. We calculate the instantaneous outflow rates in individual MUSE spaxels by constructing resolved mass outflow rate maps, incorporating variable outflow density and velocity. We compare the instantaneous values with time-averaged outflow rates by placing mock fibres and slits on the MUSE field-of-view, a method often used in the literature. The instantaneous outflow rates (0.2-275 M-circle dot yr(-1)) tend to be two orders of magnitude higher than the time-averaged outflow rates (0.001-40 M-circle dot yr(-1)). The outflow rates correlate with the AGN bolometric luminosity (L-bol similar to 10(42.71)-10(45.62) erg s(-1)) but we find no correlations with black hole mass (10(6.1)-10(8.9) M-circle dot), Eddington ratio (0.002-1.1), and radio luminosity (10(21)-10(26) W Hz(-1)). We find the median coupling between the kinetic energy and L-bol to be 1 per cent, consistent with the theoretical predictions for an AGN-driven outflow.
- ItemStellar variability in the VVV survey(2013) Catelan, Márcio; Minniti, D.; Lucas, P. W.; Dékány, I.; Saito, R. K.; Angeloni, Rodolfo; Alonso-García, J.; Hempel, M.; Helminiak, Krzysztof Grzegorz; Jordán, A.; Contreras Ramos, Rodrigo Andrés; Navarrete, C.; Beamin Muhlenbrock, Juan Carlos; Rojas, A. F.; Gran, F.; Ferreira Lopes, C. E.; Contreras Peña, Carlos Eduardo; Kerins, E.; Huckvale, L.; Rejkuba, M.; Cohen, R.; Mauro, F.; Borissova, J.; Amigo, P.; Eyheramendy Duerr, Susana; Pichara Baksai, Karim Elías; Espinoza, N.; Navarro, C.; Hajdu, G.; Calderón Espinoza, Diego Nicolás; Muro, G. A.; Andrews, H.; Motta, V.; Kurtev, R.; Emerson, J. P.; Moni Bidin, C.; Chené, A. -N.The Vista Variables in the Via Lactea (VVV) ESO Public Survey is an ongoing time-series, near-infrared (IR) survey of the Galactic bulge and an adjacent portion of the inner disk, covering 562 square degrees of the sky, using ESOs VISTA telescope. The survey has provided superb multi-color photometry in 5 broadband filters ($Z$, $Y$, $J$, $H$, and $K_s$), leading to the best map of the inner Milky Way ever obtained, particularly in the near-IR. The main variability part of the survey, which is focused on $K_s$-band observations, is currently underway, with bulge fields having been observed between 31 and 70 times, and disk fields between 17 and 36 times. When the survey is complete, bulge (disk) fields will have been observed up to a total of 100 (60) times, providing unprecedented depth and time coverage. Here we provide a first overview of stellar variability in the VVV data, including examples of the light curves that have been collected thus far, scientific applications, and our efforts towards the automated classification of VVV light curves....
- ItemStellar variability in the VVV survey: overview and first results(2013) Catelan, Márcio; Minniti, D.; Lucas, P. W.; Dékány, I.; Saito, R. K.; Angeloni, Rodolfo; Alonso-García, J.; Hempel, M.; Hełminiak, K.; Jordán, A.; Contreras Ramos, Rodrigo Andrés; Navarrete, C.; Beamin Muhlenbrock, Juan Carlos; Rojas, A. F.; Gran, F.; Ferreira Lopes, C. E.; Contreras Peña, Carlos Eduardo; Kerins, E.; Huckvale, L.; Rejkuba, M.; Cohen, R.; Mauro, F.; Borissova, J.; Amigo, P.; Eyheramendy Duerr, Susana; Pichara Baksai, Karim Elías; Espinoza, N.; Navarro, C.; Hajdu, G.; Calderón Espinoza, Diego Nicolás; Muro, G. A.; Andrews, H.; Motta, V.; Kurtev, R.; Emerson, J. P.; Moni Bidin, C.; Chené, A. -N.The Vista Variables in the Vía Láctea (VVV) ESO Public Survey is an ongoing time-series, near-infrared (IR) survey of the Galactic bulge and an adjacent portion of the inner disk, covering 562 square degrees of the sky, using ESOs VISTA telescope. The survey has provided superb multi-color photometry in 5 broadband filters (Z, Y, J, H, and K<SUB>s</SUB> ), leading to the best map of the inner Milky Way ever obtained, particularly in the near-IR. The main part of the survey, which is focused on the variability in the K<SUB>s</SUB> -band, is currently underway, with bulge fields observed between 34 and 73 times, and disk fields between 34 and 36 times. When the survey is complete, bulge (disk) fields will have been observed up to a total of 100 (60) times, providing unprecedented depth and time coverage in the near-IR. Here we provide a first overview of stellar variability in the VVV data....
- ItemThe nature of 50 Palermo Swift-BAT hard X-ray objects through optical spectroscopy(2017) Rojas, A. F.; Masetti, N.; Minniti, D.; Jiménez Bailón, E.; Chavushyan, V.; Hau, G.; McBride, V. A.; Bassani, L.; Bazzano, A.; Galaz, Gaspar; Rojas, A. F.; Masetti, N.; Minniti, D.; Jiménez Bailón, E.; Chavushyan, V.; Hau, G.; McBride, V. A.; Bassani, L.; Bazzano, A.; Galaz, Gaspar