English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present results obtained from ALMA CO (2-1) data of the double-barredgalaxy NGC 3504. With three times higher angular resolution (~ 0."8) thanprevious studies, our observations reveal an inner molecular gas bar, a nuclearring, and four inner spiral arm-like structures in the central 1 kpc region.Furthermore, the CO emission is clearly aligned with the two dust lanes in theouter bar region, with differences in shape and intensity between them. Thetotal molecular gas mass in the observed region (50"x57") is estimated to be$\sim 3.1\times 10^9 \, {\rm M}_{\odot}$, which is 17 per cent of the stellarmass. We used the Kinemetry package to fit the velocity field and found thatcircular motion strongly dominates at $R= 0.3-0.8$ kpc, but radial motionbecomes important at $R<0.3$ kpc and $R=1.0-2.5$ kpc, which is expected due tothe presence of the inner and outer bars. Finally, assuming that the gas movesalong the dust lanes in the bar rotating frame, we derived the pattern speed ofthe outer bar to be $ 18\pm5$ km s$^{-1}$ kpc$^{-1}$, the average streamingvelocities on each of the two dust lanes to be 165 and 221 km s$^{-1}$, and thetotal mass inflow rate along the dust lanes to be 12 M$_{\odot}$ yr$^{-1}$. Ourresults give a new example of an inner gas bar within a gas-rich double-barredgalaxy and suggest that the formation of double-barred galaxies could beassociated with the existence of such gas structures.

Morphological and Kinematical Analysis of the Double-barred Galaxy NGC 3504 Using ALMA CO (2-1) Data