Testing MOND gravity in the shell galaxy NGC 3923

J 2013

Testing MOND gravity in the shell galaxy NGC 3923

BÍLEK, Michal; Bruno JUNGWIERT; Lucie JÍLKOVÁ; Ivana EBROVÁ; Kateřina BARTOŠKOVÁ et al.

Základní údaje

Originální název

Testing MOND gravity in the shell galaxy NGC 3923

Autoři

BÍLEK, Michal; Bruno JUNGWIERT; Lucie JÍLKOVÁ; Ivana EBROVÁ; Kateřina BARTOŠKOVÁ a Miroslav KŘÍŽEK

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2013, 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: 4.479

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/13:00070675

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1051/0004-6361/201322060

UT WoS

000327847200110

Klíčová slova anglicky

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

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 9. 4. 2014 16:54, Ing. Andrea Mikešková

Anotace

V originále

The elliptical galaxy NGC 3923 is surrounded by numerous stellar shells that are concentric arcs centered on the Galactic core. They are very likely a result of a minor merger and they consist of stars in nearly radial orbits. For a given potential, the shell radii at a given time after the merger can be calculated and compared to observations. The MOdified Newtonian Dynamics (MOND) is a theory that aims to solve the missing mass problem by modifying the laws of classical dynamics in the limit of small accelerations. Hernquist & Quinn (1987, ApJ, 312, 1) claimed that the shell distribution of NGC 3923 contradicted MOND, but Milgrom (1988, ApJ, 332, 86) found several substantial insufficiencies in their work. We test whether the observed shell distribution in NGC 3923 is consistent with MOND using the current observational knowledge of the shell number and positions and of the host galaxy surface brightness profile, which supersede the data available in the 1980s when the last (and negative) tests of MOND viability were performed on NGC 3923. Using the 3.6micro-m bandpass image of NGC 3923 from the Spitzer space telescope we construct the mass profile of the galaxy. The evolution of shell radii in MOND is then computed using analytical formulae. We use 27 currently observed shells and allow for their multi-generation formation, unlike the Hernquist & Quinn one-generation model that used the 18 shells known at the time. Our model reproduces the observed shell radii with a maximum deviation of ~5% for 25 out of 27 known shells while keeping a reasonable formation scenario. A multi-generation nature of the shell system, resulting from successive passages of the surviving core of the tidally disrupted dwarf galaxy, is one of key ingredients of our scenario supported by the extreme shell radial range. The 25 reproduced shells are interpreted as belonging to three generations.

Citovat

BÍLEK, Michal; Bruno JUNGWIERT; Lucie JÍLKOVÁ; Ivana EBROVÁ; Kateřina BARTOŠKOVÁ a Miroslav KŘÍŽEK. Testing MOND gravity in the shell galaxy NGC 3923. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2013, roč. 559, č. 1, s. 110-117. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201322060.

@article{1138094,
   author = {Bílek, Michal and Jungwiert, Bruno and Jílková, Lucie and Ebrová, Ivana and Bartošková, Kateřina and Křížek, Miroslav},
   article_location = {LES ULIS CEDEX A},
   article_number = {1},
   doi = {https://doi.org/10.1051/0004-6361/201322060},
   keywords = {gravitation; galaxies: elliptical and lenticular; cD galaxies; formation of galaxies; NGC 3923; kinematics and dynamics of galaxies},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Testing MOND gravity in the shell galaxy NGC 3923},
   url = {http://adsabs.harvard.edu/abs/2013A%26A...559A.110B},
   volume = {559},
   year = {2013}
}

TY  - JOUR
ID  - 1138094
AU  - Bílek, Michal - Jungwiert, Bruno - Jílková, Lucie - Ebrová, Ivana - Bartošková, Kateřina - Křížek, Miroslav
PY  - 2013
TI  - Testing MOND gravity in the shell galaxy NGC 3923
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 559
IS  - 1
SP  - 110-117
EP  - 110-117
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - gravitation
KW  - galaxies: elliptical and lenticular
KW  - cD galaxies
KW  - formation of galaxies
KW  - NGC 3923
KW  - kinematics and dynamics of galaxies
UR  - http://adsabs.harvard.edu/abs/2013A%26A...559A.110B
L2  - http://adsabs.harvard.edu/abs/2013A%26A...559A.110B
N2  - The elliptical galaxy NGC 3923 is surrounded by numerous stellar shells that are concentric arcs centered on the Galactic core. They are very likely a result of a minor merger and they consist of stars in nearly radial orbits. For a given potential, the shell radii at a given time after the merger can be calculated and compared to observations. The MOdified Newtonian Dynamics (MOND) is a theory that aims to solve the missing mass problem by modifying the laws of classical dynamics in the limit of small accelerations. Hernquist & Quinn (1987, ApJ, 312, 1) claimed that the shell distribution of NGC 3923 contradicted MOND, but Milgrom (1988, ApJ, 332, 86) found several substantial insufficiencies in their work. We test whether the observed shell distribution in NGC 3923 is consistent with MOND using the current observational knowledge of the shell number and positions and of the host galaxy surface brightness profile, which supersede the data available in the 1980s when the last (and negative) tests of MOND viability were performed on NGC 3923. Using the 3.6micro-m bandpass image of NGC 3923 from the Spitzer space telescope we construct the mass profile of the galaxy. The evolution of shell radii in MOND is then computed using analytical formulae. We use 27 currently observed shells and allow for their multi-generation formation, unlike the Hernquist & Quinn one-generation model that used the 18 shells known at the time. Our model reproduces the observed shell radii with a maximum deviation of ~5% for 25 out of 27 known shells while keeping a reasonable formation scenario. A multi-generation nature of the shell system, resulting from successive passages of the surviving core of the tidally disrupted dwarf galaxy, is one of key ingredients of our scenario supported by the extreme shell radial range. The 25 reproduced shells are interpreted as belonging to three generations.
ER  -

BÍLEK, Michal; Bruno JUNGWIERT; Lucie JÍLKOVÁ; Ivana EBROVÁ; Kateřina BARTOŠKOVÁ a Miroslav KŘÍŽEK. Testing MOND gravity in the shell galaxy NGC 3923. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2013, roč.~559, č.~1, s.~110-117. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201322060.

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