Enhanced Doppler Beaming for Dust-enshrouded Objects and
Pulsars in the Galactic Center

J 2021

Enhanced Doppler Beaming for Dust-enshrouded Objects and Pulsars in the Galactic Center

ZAJAČEK, Michal

Základní údaje

Originální název

Enhanced Doppler Beaming for Dust-enshrouded Objects and Pulsars in the Galactic Center

Autoři

ZAJAČEK, Michal (703 Slovensko, garant, domácí)

Vydání

The Astrophysical Journal, IOP Publishing Ltd. 2021, 0004-637X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.521

Kód RIV

RIV/00216224:14310/21:00119133

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.3847/1538-4357/ac043a

UT WoS

000673777500001

Klíčová slova anglicky

Galactic center; Stellar photometry; Relativistic binary stars

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 14. 12. 2021 10:59, Mgr. Marie Šípková, DiS.

Anotace

V originále

Stars within the innermost part of the nuclear star cluster can reach orbital velocities up to a few percent of the light speed. As analyzed by Rafikov, Doppler boosting of stellar light may be of relevance at the pericenter of stellar orbits, especially with the upcoming high-precision photometry in the near- and mid-infrared bands. Here we analyze the previously neglected effect of the infrared spectral index of monitored objects on the Doppler-boosted continuum emission in a narrow photometric band. In contrast to main-sequence stars, the detected compact infrared-excess dust-enshrouded objects have an enhanced Doppler-boosting effect by as much as an order of magnitude, with the variability amplitude of the order of 10% for the most eccentric orbits. In a similar way, pulsars dominated by nonthermal synchrotron emission are also expected to exhibit a stronger Doppler-boosted signal by a factor of at least 4 in comparison with canonical S stars. In case the stellar orbit is robustly determined, the relative flux variation can thus provide hints about the nature of the objects. For extended dust-enshrouded objects, such as G1, that are variable due to tidal, ellipsoidal, bow-shock, and irradiation effects, the subtraction of the expected Doppler-boosting variations will help to better comprehend their internal physics. In addition, the relative flux variability due to higher-order relativistic effects is also modified for different negative spectral indices in a way that it can obtain both positive and negative values with the relative variability of the order of 1%.

Návaznosti

GX21-13491X, projekt VaV

Název: Zkoumání žhavého vesmíru a porozumění kosmické zpětné vazbě (Akronym: EHU)

Investor: Grantová agentura ČR, Exploring the Hot Universe and Understanding Comic Feedback

Citovat

ZAJAČEK, Michal. Enhanced Doppler Beaming for Dust-enshrouded Objects and Pulsars in the Galactic Center. The Astrophysical Journal. IOP Publishing Ltd., 2021, roč. 915, č. 2, s. "111", 7 s. ISSN 0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ac043a.

@article{1786598,
   author = {Zajaček, Michal},
   article_number = {2},
   doi = {http://dx.doi.org/10.3847/1538-4357/ac043a},
   keywords = {Galactic center; Stellar photometry; Relativistic binary stars},
   language = {eng},
   issn = {0004-637X},
   journal = {The Astrophysical Journal},
   title = {Enhanced Doppler Beaming for Dust-enshrouded Objects and Pulsars in the Galactic Center},
   url = {https://doi.org/10.3847/1538-4357/ac043a},
   volume = {915},
   year = {2021}
}

TY  - JOUR
ID  - 1786598
AU  - Zajaček, Michal
PY  - 2021
TI  - Enhanced Doppler Beaming for Dust-enshrouded Objects and Pulsars in the Galactic Center
JF  - The Astrophysical Journal
VL  - 915
IS  - 2
SP  - "111"
EP  - "111"
PB  - IOP Publishing Ltd.
SN  - 0004637X
KW  - Galactic center
KW  - Stellar photometry
KW  - Relativistic binary stars
UR  - https://doi.org/10.3847/1538-4357/ac043a
N2  - Stars within the innermost part of the nuclear star cluster can reach orbital velocities up to a few percent of the light speed. As analyzed by Rafikov, Doppler boosting of stellar light may be of relevance at the pericenter of stellar orbits, especially with the upcoming high-precision photometry in the near- and mid-infrared bands. Here we analyze the previously neglected effect of the infrared spectral index of monitored objects on the Doppler-boosted continuum emission in a narrow photometric band. In contrast to main-sequence stars, the detected compact infrared-excess dust-enshrouded objects have an enhanced Doppler-boosting effect by as much as an order of magnitude, with the variability amplitude of the order of 10% for the most eccentric orbits. In a similar way, pulsars dominated by nonthermal synchrotron emission are also expected to exhibit a stronger Doppler-boosted signal by a factor of at least 4 in comparison with canonical S stars. In case the stellar orbit is robustly determined, the relative flux variation can thus provide hints about the nature of the objects. For extended dust-enshrouded objects, such as G1, that are variable due to tidal, ellipsoidal, bow-shock, and irradiation effects, the subtraction of the expected Doppler-boosting variations will help to better comprehend their internal physics. In addition, the relative flux variability due to higher-order relativistic effects is also modified for different negative spectral indices in a way that it can obtain both positive and negative values with the relative variability of the order of 1%.
ER  -

ZAJAČEK, Michal. Enhanced Doppler Beaming for Dust-enshrouded Objects and Pulsars in the Galactic Center. \textit{The Astrophysical Journal}. IOP Publishing Ltd., 2021, roč.~915, č.~2, s.~''111'', 7 s. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ac043a.

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