Документ взят из кэша поисковой машины. Адрес оригинального документа : http://hea.iki.rssi.ru/conf/hea2010/Presentations/23/Moiseev.pdf Дата изменения: Wed Jan 26 13:25:08 2011 Дата индексирования: Tue Oct 2 00:46:47 2012 Кодировка: Windows-1251 Поисковые слова: рер р р р р р р р р р р р р р

: ?

,

( )

, (- ) (New Mexico State University)



CDM 15-30 /c (Tikhonov & Klypin, 2009, MNRAS). (Hoeft et al., 2006; Loeb, 2008) ? + + , ..
CGCG 269-049


HI HII
IFUs, Fabry-Perot interferometers ISM Spatial resolution Velocity resolution Ionized gas 1-2 arcsec 10-30 km/s 21 cm radio inrerferometers Neutral hydrogen 10-50 arcsec 2-10 km/s

GMRT(Begum et al, 2008)

DDO125 HI

HI and HII (, , .): IC10, 1613 ( , 2003-2008) NGC 2366 (van Eymeren et al, 2008) NGC 4861 (van Eymeren et al, 2009)

H

6-m telescope, SCORPIO/FPI


UGC 8508 (SDSS)

sion disper ocity gas vel d Ionize

HI and HII rotation velocities

<

HI

>

: V/>1 !


:
HII , .. HII>10-20 km/s (Skillman & Balick, 1984; Melnik et al., 1987)
GHIIRs (Melnick et al., 1999): (1) HII
HII

=9.7 km/s for T=10000

(2) : , , "" (3) : , ( ,

(Tenorio-Tagle, 1993) HII, HII (Terlevich & Melnick, 1981; Melnick et al., 1987, 1988, 2000)

?



(dIrr, BCDG):
I Zw 18 (Petrosian et al. 1997), Mrk 86 (Gil de Paz et al. 1997) NGC4449 - Muсoz-Tuсуn et al (1998) NGC 2366, NGC 4861 (van Eymeren et al, 2008-2009)

( , ):
6 BCDGs - Цstlin et al (1999) 23 dIRR in GHASP - Epinat et al (2008), ~10 ...

6- :

VIIZw403 - . (2006) KK12, DDO125, U8508 - ( - . Begum) 9 BCDG Muсoz-Tuсуn(IAC), Martines-Delgado, et al. (2007)

( 2002-2005):

:

12 ,(Moiseev et al., 2010) 23 .

: 48 MB=-11...-18.5


: -
SCORPIO (, , 2005) 6- , Ha
: 6 arcmin : 0.35-0.70 arcsec/px : 0.5 - 0.8 Е

(=FWHM/2.35 = 9.5-14.5 km/s)

6- : www.sao.ru


H images

Velocity fields



=15 km/s Voigt profile fitting (Moiseev & Egorov, 2008)

=39 km/s


"I-"
+ Ha

( )

gas
Intensity

HII



HII (Terlevich & Melnick, 1981; Melnick et al, 1988, 1989, 2000)
gas



.. . .

= intensity-weighted velocity dispersion


:


?





Merging and outflow

UG993

Moiseev, Pustilnik, Kniazev (2010)

NGC 4460
Moiseev, Karachentsev, Kaisin (2010)




V

: ћ ( HI) ћ , .


...

Green et al. (2010, Nature,467, 684)


?


48 , MB=-11...-18 ( ), , . --



--
(44/48=92%) , : Vmax>Vres Ha image Mrk 36 Velocities Model Velocities-model

MB=-14.9

UGC5423

MB=-14.7


Vmax (LEDA+our measurements)



gas

has no correlation with amplitude of ionized gas rotation curve


Dopita (2005)


CGCG 269-049: an example of Vmax~10 km/s
CGCG 269-049

HI data: Begun et al (2006)


HI and HII velocity dispersion
Correction for the dynamical support provided by random motions (the "asymmetric drift" correction) for HI velocities Begum & Chengalur (2004)

Is asymmetric drift correction applicable to ionized gas motions? BUT

The turbulent motions of gaseous component in giant extragalactic HII regions are supersonic (Skillman & Balick, 1984; Melnik et al., 1987)



HII>10-20

km/s


Supersonic motions in giant HII regions: (Muсoz-Tuсуn et al., 1996)

Martines-Delgado, et al.(2007): Sigma vs. Peak inentsity diagrams in 3 BCDG


Why do we study inner kinematics of dwarf galaxies?
Below some mass the halos are expected to stop producing galaxies inside them. - stellar feedback (Dekel & Silk, 1986) - photoionization (Bullock et al., 2000)

may play a significant role in quenching starformation in too small halos.
(

Loeb, 2008): Vlim below which halos have essentially no gas infall due to increase
of Jeans mass caused by UV background at the epoch of reionization:
TIGM is the temperature of intergalactic medium gas ionized by stars.

Vlim = 34 ћ (TIGM /1.5 ћ104 K)

1/2

km/s,

(Hoeft et al., 2006): high-resolution hydrodynamic simulations, assuming that cosmological UV-background photo-evaporates baryons out of halos of dwarf galaxies, and thereby limits their cooling and starformation rate.

We start work on mass modelling and dark matter content of smallest star forming galaxies. Observational data: Ha (FPI) and HI (references) velocity fields