Transparency and Interdependence

Mauro, Salvatore Di

doi:10.1007/978-981-4585-11-8_10

Cited by 42 publications

(70 citation statements)

References 3 publications

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“…Therefore IGRB represents the sum of a true extragalactic diffuse component, plus the contribution of unresolved sources (which mimic and contaminate the diffuse component). According to , Di Mauro (2015) and , unresolved HSPs/BL lacs may be the dominant component of the IGRB at E > 10 GeV and indeed, here we bring evidence of a population composed of faint γ-ray HSP blazars near the detectability threshold from Fermi-LAT, that was previously undetected. Based on the model for individual sources, we calculate their corresponding fluxes for each energy bin (E bin are listed in Table 1), and sum over our γ-ray detections at |b| > 10 Ackermann et al (2015a), following the same E bin steps as theirs.…”

Section: The Isotropic γ-Ray Background: Contribution From Hsp Blazarsupporting

confidence: 73%

Searching forγ-ray signature in WHSP blazars

Arsioli

Chang

2017

A&A

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Aims. A direct search of γ-ray emission centered on multifrequency selected candidates is a valuable complementary approach to the standard search adopted in current γ-ray Fermi-LAT catalogs. Our sources are part of the 2WHSP sample that was assembled with the aim of providing targets for Imaging Atmospheric Cherenkov Telescopes (IACT). A likelihood analysis based on their known position enabled us to detect 150 γ-ray excess signals that have not yet been reported in previous γ-ray catalogs (1FGL, 2FGL, 3FGL). By identifying new sources, we solve a fraction of the extragalactic isotropic γ-ray background (IGRB) composition, improving the description of the γ-ray sky. Methods. We perform data reduction with the Fermi Science Tools using positions from 400 high synchrotron peaked (HSP) blazars as seeds of tentative γ-ray sources; none of them have counterparts from previous 1FGL, 2FGL and 3FGL catalogs. Our candidates are part of the 2WHSP sample (currently the largest set of HSP blazars). We focus on HSPs characterized by bright synchrotron component with peak flux ν f (ν) ≥ 10 −12.1 erg/cm 2 /s, testing the hypothesis of having a γ-ray source in correspondence to the WHSP positions. Our likelihood analysis considers the 0.3−500 GeV energy band, integrating over 7.2 yr of Fermi-LAT observation and making use of the Pass 8 data release. Results. From the 400 candidates tested, a total of 150 2WHSPs showed excess γ-ray signature: 85 high-significance detections with test statistic (TS) > 25, and 65 lower-significance detections with TS between 10 to 25. We assume a power law spectrum in the 0.3−500 GeV band and list the spectrum parameters describing all 150 new γ-ray sources. We study the γ-ray photon spectral index distribution, the likelihood of detection according to the synchrotron peak brightness (figure of merit parameter), and plot the measured γ-ray LogN-LogS of HSP blazars, also discussing the portion of the IGRB that has been resolved by the present work. We also report on four cases where we could resolve source confusion and find counterparts for unassociated 3FGL sources with the help of high-energy TS maps together with multifrequency data. The 150 new γ-ray sources are named with the acronym 1BIGB for the first version of the Brazil ICRANet Gamma-ray Blazar catalog, in reference to the cooperation agreement supporting this work.

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Section: The Isotropic γ-Ray Background: Contribution From Hsp Blazarsupporting

confidence: 73%

Searching forγ-ray signature in WHSP blazars

Arsioli

Chang

2017

A&A

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“…α Cen (Guenther & Demarque 2000;Morel et al 2000, Théevenin et al 2002Eggenberger et al 2004); η Boo (Christensen-Dalsgaard et al 1995;Di Mauro et al 2004;Guenther 2004). A recent review on the problem and prospects of the modeling of the solar-like oscillators is presented by Di Mauro (2013).…”

Section: Asteroseismic Modelingmentioning

confidence: 99%

Asteroseismology of Pulsating Stars

Joshi

2015

J Astrophys Astron

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Abstract.The success of helioseismology is due to its capability of measuring p-mode oscillations in the Sun. This allows us to extract informations on the internal structure and rotation of the Sun from the surface to the core. Similarly, asteroseismology is the study of the internal structure of the stars as derived from stellar oscillations. In this review we highlight the progress in the observational asteroseismology, including some basic theoretical aspects. In particular, we discuss our contributions to asteroseismology through the study of chemically peculiar stars under the "Nainital-Cape Survey" project being conducted at ARIES, Nainital since 1999. This survey aims to detect new rapidly-pulsating Ap (roAp) stars in the northern hemisphere. We also discuss the contribution of ARIES towards the asteroseismic study of the compact pulsating variables. We comment on the future prospects of our project in the light of the new optical 3.6-m telescope to be install at Devasthal (ARIES). Finally, we present a preliminary optical design of the high-speed imaging photometers for this telescope.

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“…4.1) Figure 5 shows location in the H-R diagram of the solar-type pulsating stars with few typical solar-like targets. Some recent reviews on asteroseismology of solar-like oscillators include those by [15,38,108,33,53].…”

Section: Solar-like Pulsatorsmentioning

confidence: 99%

A review on Asteroseismology

Mauro¹,

Pia²

2017

Proceedings of Frontier Research in Astrophysics – II — PoS(FRAPWS2016)

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Over the last decade, thanks to the successful space missions launched to detect stellar pulsations, Asteroseismology has produced an extraordinary revolution in astrophysics, unveiling a wealth of results on structural properties of stars over a large part of the H-R diagram. Particularly impressive has been the development of Asteroseismology for stars showing solarlike oscillations, which are excited and intrinsically damped in stars with convective envelopes. Here I will review on the modern era of Asteroseismology with emphasis on results obtained for solar-like stars and discuss its potential for the advancement of stellar physics.

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Transparency and Interdependence

Cited by 42 publications

References 3 publications

Searching forγ-ray signature in WHSP blazars

Searching forγ-ray signature in WHSP blazars

Asteroseismology of Pulsating Stars

A review on Asteroseismology

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