2024MNRAS.534.2196D

Query : 2024MNRAS.534.2196D

2024MNRAS.534.2196D - Mon. Not. R. Astron. Soc., 534, 2196-2203 (2024/November-1)

Explaining the oblate morphology of dwarf spheroidals with wave dark matter perturbations.

DELLA MONICA R., DE MARTINO I. and BROADHURST T.

Abstract (from CDS):

We investigate whether the oblate, spheroidal morphology of common dwarf spheroidal galaxies (dSph) may result from the slow relaxation of stellar orbits within a halo of wave dark matter ( $\psi$ DM) when starting from an initial disc of stars. Stellar orbits randomly walk over a Hubble time, perturbed by the pervasive 'granular' interference pattern of $\psi$ DM, that fully modulates the dark matter density on the de Broglie scale. Our simulations quantify the level of stellar disc thickening over the Hubble time, showing that distribution of stars is predicted to become an oblate spheroid of increasing radius, that plausibly accounts for the morphology of dSph galaxies. We predict a low level of residual rotation remains after a Hubble time at the 1-3 km/s level, depending on orientation, that compares with recent claims of rotation for some well-studied local dSph galaxies. This steady internal dynamical evolution may be witnessed directly with JWST for well-resolved dwarf galaxies, appearing more oblate with look back time and tending to small discs of young stars at high redshift.

Journal keyword(s): gravitation - galaxies: dwarf - galaxies: haloes - galaxies: kinematics and dynamics - dark matter

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	Z 318-18	G	15 09 08.0	+67 13 21		13.60	10.6			~	1459	0

Query : 2024MNRAS.534.2196D

Basic data :

Z 318-18 -- Galaxy

G (2008ApJ,DDO,...)

15 09 08.0 +67 13 21 (Optical) [ ] D 2021ApJ...922..267C

15 08 31.5 +67 24 42 [ ]

104.9662 +44.8009 [ ]

0.056 0.074 [0.078 0.099 ] C 1995AJ....110.2747S

V(km/s) -246.9 [0.1] / z(spectroscopic) -0.000823 [0.000000] / cz -246.80 [0.10] C 2012AJ....144....4M

dSph D 2012AJ....144....4M

32.2333 32.2333 90 (NIR) E 2008MNRAS.389.1924F

B 13.60 [~] D 2005A&A...436..443V

V 10.6 [0.5] D 2012AJ....144....4M

K 8.17 [~] D 2008MNRAS.389.1924F

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`NAME UMi`	`MCG+11-18-030`	`NAME Ursa Minor Dwarf Galaxy`	`Z 1508.2+6723`
`Anon 1508+67`	`NAME UMi dSph`	`UGC 9749`	`[VDD93] 204`
`DDO 199`	`NAME Ursa Minor`	`UZC J150910.2+671252`	`EQ 1508+674`
`K73 663`	`NAME UMi Galaxy`	`Z 318-18`
`LEDA 54074`	`NAME UMi Dwarf Galaxy`	`Z 319-1`

References (1459 between 1850 and 2026) (Total 1459)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : Z 318-18

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K73 663 UGC 9749

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