Irene Albarrán Lozano
A5003373473- Astrophysics and Cosmic Phenomena
- Aging, Health, and Disability
- Insurance, Mortality, Demography, Risk Management
- Social Sciences and Policies
- Global Health Care Issues
- Health disparities and outcomes
- Insurance and Financial Risk Management
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Migration, Aging, and Tourism Studies
- Astrophysical Phenomena and Observations
- Advertising and Communication Studies
- Media and Digital Communication
- Comparative International Legal Studies
- Labor Law and Work Dynamics
- Business, Education, Mathematics Research
- Retirement, Disability, and Employment
- Psychological Well-being and Life Satisfaction
- Educational Technology in Learning
- Employment, Labor, and Gender Studies
- demographic modeling and climate adaptation
- Journalism and Media Studies
- Finance, Taxation, and Governance
- Chronic Obstructive Pulmonary Disease (COPD) Research
Universidad Carlos III de Madrid
2011-2023
Universidad Complutense de Madrid
2000-2016
Universidad de Extremadura
2003-2011
Universidad de Alcalá
2011
Supermassive black holes with masses of millions to billions solar are commonly found in the centers galaxies. Astronomers seek image jet formation using radio interferometry, but still suffer from insufficient angular resolution. An alternative method resolve small structures is measure time variability their emission. Here, we report on gamma-ray observations galaxy IC 310 obtained MAGIC telescopes revealing doubling scales faster than 4.8 min. Causality constrains size emission region be...
We present the results of stereoscopic observations satellite galaxy Segue 1 with MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours good-quality data, this is deepest observational campaign on any dwarf performed so far in very high energy range electromagnetic spectrum. search large data sample for signals dark matter particles mass 100 GeV 20 TeV. For we use full likelihood analysis method, which provides optimal sensitivity to characteristic gamma-ray spectral...
We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, Whipple, among other instruments collaborations. was found in its typical (non-flaring) activity state, with flux of about half that the Crab Nebula, yet light curves show significant variability at all wavelengths, highest being X-rays. determined power spectral densities (PSD) most wavelengths...
Among more than fifty blazars detected in very high energy (VHE, E>100GeV) gamma-rays, only three belong to the subclass of Flat Spectrum Radio Quasars (FSRQs). MAGIC observed FSRQ PKS 1510-089 February-April 2012 during a activity state (HE, E>100 MeV) gamma-ray band by AGILE and Fermi. observations result detection source with significance 6.0 sigma. In agreement previous VHE source, we find no statistically significant variability daily, weekly or monthly time scales. The other two...
Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal to characterize detail source gamma-ray emission, together with radio-to-X-ray during non-flaring (low) activity, which less often than occasional flaring (high) activity. We organized a multiwavelength (MW) campaign on between March May 2008. This multi-instrument effort included most sensitive instruments northern hemisphere, namely imaging atmospheric...
The radio galaxy NGC 1275, recently identified as a very high energy (VHE, >100 GeV) gamma-ray emitter by MAGIC, is one of the few non-blazar AGN detected in VHE regime. In order to better understand origin emission and locate it within galaxy, we studied contemporaneous multi-frequency observations 1275 modeled overall spectral distribution (SED). We analyzed unpublished MAGIC carried out between Oct. 2009 Feb. 2010, previously published ones taken Aug. 2010 2011. multi-band variability...
Context. The radio galaxy IC 310 has recently been identified as a gamma-ray emitter based on observations at GeV energies with Fermi-LAT and very high (VHE, E>100GeV) the MAGIC telescopes. Originally classified head-tail galaxy, nature of this object is subject controversy since its nucleus shows blazar-like behavior. Aims. In order to understand origin VHE emission we studied spectral flux variability from X-ray band regime. Methods. light curve above 300GeV measured telescopes Oct. 2009...
We present a study of the very high energy (VHE; E > 100 GeV) gamma-ray emission blazar PKS 1424+240 observed with MAGIC telescopes. The primary aim this paper is multiwavelength spectral characterization and modeling blazar, which made particularly interesting by recent discovery lower limit its redshift z 0.6 makes it promising candidate to be most distant VHE source. source has been telescopes in gamma rays for total observation time ~33.6 h from 2009 2011. was marginally detected during...
The pulsar wind nebula (PWN) 3C 58 is one of the historical very-high-energy (VHE; E>100 GeV) gamma-ray source candidates. It energized by highest spin-down power pulsars known (5% Crab pulsar) and it has been compared to Nebula due their morphological similarities. This object was previously observed imaging atmospheric Cherenkov telescopes (Whipple, VERITAS MAGIC), although not detected, with an upper limit 2.4% Unit (C.U.) at VHE. detected Fermi-LAT a spectrum extending beyond 100 GeV. We...
We study the multifrequency emission and spectral properties of quasar 3C 279. observed 279 in very high energy (VHE, E>100GeV) gamma rays, with MAGIC telescopes during 2011, for first time stereoscopic mode. combine these measurements observations at other bands: (HE, E>100MeV) rays from Fermi-LAT, X-rays RXTE, optical KVA telescope radio 43GHz, 37GHz 15GHz VLBA, Mets\"ahovi OVRO polarisation Liverpool telescopes. During (February to April 2011) was a low state optical, X-ray rays. The did...
The high-frequency-peaked BL Lac (HBL) 1ES 0806+524 (z = 0.138) was discovered in VHE $\gamma$ rays 2008. Until now, the broad-band spectrum of has been only poorly characterized, particular at high energies. We analysed multiwavelength observations from to radio performed 2011 January March, which were triggered by activity detected optical frequencies. These constitute most precise determination emission date. stereoscopic MAGIC yielded a $\gamma$-ray signal above 250 GeV $(3.7 \pm 0.7)$...
We aim to characterize the broadband emission from 2FGL J2001.1+4352, which has been associated with unknown-redshift blazar MG4 J200112+4352. Based on its gamma-ray spectral properties, it was identified as a potential very high energy (VHE; E > 100 GeV) emitter. The source observed MAGIC first in 2009 and later 2010 within multi-instrument observation campaign. observations yielded 14.8 hours of good quality stereoscopic data. object monitored at radio, optical energies during years 2011....
The Crab pulsar is the only astronomical pulsed source detected at very high energy (VHE, E>100GeV) gamma-rays. emission mechanism of VHE pulsation not yet fully understood, although several theoretical models have been proposed. In order to test new models, we measured light curve and spectra with precision by means deep observations. We analyzed 135 hours selected MAGIC data taken between 2009 2013 in stereoscopic mode. discuss spectral shape connection lower energies, 4.6 years {\it...
PG 1553+113 is a very-high-energy (VHE, $E>100\,\mathrm{GeV}$) $\gamma$-ray emitter classified as BL Lac object. Its redshift constrained by intergalactic absorption lines in the range $0.4<z<0.58$. The MAGIC telescopes have monitored source's activity since 2005. In early 2012, was found high-state, and later, April of same year, source reached its highest VHE flux state detected so far. Simultaneous observations carried out X-rays during 2012 show similar flaring behaviour. contrast, at...
HESS J1857+026 is an extended TeV gamma-ray source that was discovered by H.E.S.S. as part of its Galactic plane survey. Given broadband spectral energy distribution and spatial coincidence with the young energetic pulsar PSR J1856+0245, has been put forward a wind nebula (PWN) candidate. MAGIC performed follow-up observations aimed at mapping down to energies approaching 100 GeV in order better understand complex morphology. observed 2010, yielding 29 hours good quality stereoscopic data...
Context. 1ES 1011+496 (z = 0.212) was discovered in very high-energy (VHE, E> 100 GeV) γ rays with MAGIC 2007. The absence of simultaneous data at lower energies led to an incomplete characterization the broadband spectral energy distribution (SED).
ABSTRACT We split the components corresponding to disability-free survival probability, and disability probability. Our analysis is conducted for men women separately, age groups over 64 years. discuss estimation of a multiple state model under several scenarios when only single survey cross-sectional data available. The conclusions are used level Spanish elderly population helpful develop welfare programs insurance products.
The number of known very high energy (VHE) blazars is ∼50, which small in comparison to the detected other frequencies. This situation a handicap for population studies blazars, emit about half their luminosity γ-ray domain. Moreover, VHE if distant, allow study environment that high-energy γ-rays traverse path towards Earth, like extragalactic background light (EBL) and intergalactic magnetic field (IGMF), hence they have special interest astrophysics community. We present first detection...
Motivated by the Costamante & Ghisellini (2002) predictions we investigated if blazar 1ES 1727+502 (z=0.055) is emitting very high energy (VHE, E>100 GeV) gamma rays. We observed BL Lac object in stereoscopic mode with two MAGIC telescopes during 14 nights between May 6th and June 10th 2011, for a total effective observing time of 12.6 hours. For study multiwavelength spectral distribution (SED) use simultaneous optical R-band data from KVA telescope, archival UV/optical X-ray observations...