MOND prediction of a new giant shell in the elliptical galaxy
NGC 3923

J 2014

MOND prediction of a new giant shell in the elliptical galaxy NGC 3923

BÍLEK, Michal; Kateřina BARTOŠKOVÁ; Ivana EBROVÁ a Bruno JUNGWIERT

Základní údaje

Originální název

MOND prediction of a new giant shell in the elliptical galaxy NGC 3923

Autoři

BÍLEK, Michal; Kateřina BARTOŠKOVÁ; Ivana EBROVÁ a Bruno JUNGWIERT

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2014, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 4.378

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/14:00076851

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

gravitation; galaxies: kinematics and dynamics; galaxies: formation; galaxies: elliptical and lenticular; cD; galaxies: individual: NGC 3923

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 27. 4. 2015 21:19, Ing. Andrea Mikešková

Anotace

V originále

Context. Stellar shells, which form axially symmetric systems of arcs in some elliptical galaxies, are most likely remnants of radial minor mergers. They are observed up a radius of similar to 100 kpc. The stars in them oscillate in radial orbits. The radius of a shell depends on the free-fall time at the position of the shell and on the time since the merger. We previously verified the consistency of shell radii in the elliptical galaxy NGC 3923 with its most probable MOND potential. Our results implied that an as yet undiscovered shell exists at the outskirts of the galaxy. Aims. We here extend our study by assuming more general models for the gravitational potential to verify the prediction of the new shell and to estimate its position. Methods. We tested the consistency of the shell radial distribution observed in NGC 3923 with a wide variety of MOND potentials of the galaxy. The potentials differed in the mass-to-light ratio and in distance to the galaxy. We considered different MOND interpolation functions, values of the acceleration constant a(0), and density profiles of the galaxy. We verified the functionality of our code on a Newtonian self-consistent simulation of the formation of a shell galaxy. Results. Our method reliably predicts that exactly one new outermost shell exists at a galactocentric radius of about 1900 '' (similar to 210 kpc) on the southwestern side of the galaxy. Its estimated surface brightness is about 28 mag arcsec(-2) in B - a value accessible by current instruments. This prediction enables a rare test of MOND in an elliptical down to an acceleration of a(0)/10. The predictive power of our method is verified by reconstructing the position of the largest known shell from the distribution of the remaining shells.

Návaznosti

MUNI/A/0773/2013, interní kód MU

Název: Pokročilé problémy teoretické fyziky a astrofyziky

Investor: Masarykova univerzita, Pokročilé problémy teoretické fyziky a astrofyziky, DO R. 2020_Kategorie A - Specifický výzkum - Studentské výzkumné projekty

Citovat

BÍLEK, Michal; Kateřina BARTOŠKOVÁ; Ivana EBROVÁ a Bruno JUNGWIERT. MOND prediction of a new giant shell in the elliptical galaxy NGC 3923. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2014, roč. 566, JUNE, s. "nestránkováno", 11 s. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201423935.

@article{1202785,
   author = {Bílek, Michal and Bartošková, Kateřina and Ebrová, Ivana and Jungwiert, Bruno},
   article_location = {LES ULIS CEDEX A},
   article_number = {JUNE},
   doi = {https://doi.org/10.1051/0004-6361/201423935},
   keywords = {gravitation; galaxies: kinematics and dynamics; galaxies: formation; galaxies: elliptical and lenticular; cD; galaxies: individual: NGC 3923},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {MOND prediction of a new giant shell in the elliptical galaxy NGC 3923},
   url = {http://adsabs.harvard.edu/abs/2014A%26A...566A.151B},
   volume = {566},
   year = {2014}
}

TY  - JOUR
ID  - 1202785
AU  - Bílek, Michal - Bartošková, Kateřina - Ebrová, Ivana - Jungwiert, Bruno
PY  - 2014
TI  - MOND prediction of a new giant shell in the elliptical galaxy NGC 3923
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 566
IS  - JUNE
SP  - "nestránkováno"
EP  - "nestránkováno"
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - gravitation
KW  - galaxies: kinematics and dynamics
KW  - galaxies: formation
KW  - galaxies: elliptical and lenticular
KW  - cD
KW  - galaxies: individual: NGC 3923
UR  - http://adsabs.harvard.edu/abs/2014A%26A...566A.151B
L2  - http://adsabs.harvard.edu/abs/2014A%26A...566A.151B
N2  - Context. Stellar shells, which form axially symmetric systems of arcs in some elliptical galaxies, are most likely remnants of radial minor mergers. They are observed up a radius of similar to 100 kpc. The stars in them oscillate in radial orbits. The radius of a shell depends on the free-fall time at the position of the shell and on the time since the merger. We previously verified the consistency of shell radii in the elliptical galaxy NGC 3923 with its most probable MOND potential. Our results implied that an as yet undiscovered shell exists at the outskirts of the galaxy. Aims. We here extend our study by assuming more general models for the gravitational potential to verify the prediction of the new shell and to estimate its position. Methods. We tested the consistency of the shell radial distribution observed in NGC 3923 with a wide variety of MOND potentials of the galaxy. The potentials differed in the mass-to-light ratio and in distance to the galaxy. We considered different MOND interpolation functions, values of the acceleration constant a(0), and density profiles of the galaxy. We verified the functionality of our code on a Newtonian self-consistent simulation of the formation of a shell galaxy. Results. Our method reliably predicts that exactly one new outermost shell exists at a galactocentric radius of about 1900 '' (similar to 210 kpc) on the southwestern side of the galaxy. Its estimated surface brightness is about 28 mag arcsec(-2) in B - a value accessible by current instruments. This prediction enables a rare test of MOND in an elliptical down to an acceleration of a(0)/10. The predictive power of our method is verified by reconstructing the position of the largest known shell from the distribution of the remaining shells.
ER  -

BÍLEK, Michal; Kateřina BARTOŠKOVÁ; Ivana EBROVÁ a Bruno JUNGWIERT. MOND prediction of a new giant shell in the elliptical galaxy NGC 3923. \textit{ASTRONOMY \&{} ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2014, roč.~566, JUNE, s.~''nestránkováno'', 11 s. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201423935.

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