2014A&A...569A...6K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.06CET16:52:12

2014A&A...569A...6K - Astronomy and Astrophysics, volume 569A, 6-6 (2014/9-1)

Molecular tendrils feeding star formation in the Eye of the Medusa. The Medusa merger in high resolution 12CO 2-1 maps.

KOENIG S., AALTO S., LINDROOS L., MULLER S., GALLAGHER III J.S., BESWICK R.J., PETITPAS G. and JUETTE E.

Abstract (from CDS):

Studying molecular gas properties in merging galaxies gives us important clues to the onset and evolution of interaction-triggered starbursts. NGC 4194 (the Medusa merger) is particularly interesting to study, since its FIR-to-CO luminosity ratio rivals that of ultraluminous galaxies (ULIRGs), despite its lower luminosity compared to ULIRGs, which indicates a high star formation efficiency (SFE) that is relative to even most spirals and ULIRGs. We study the molecular medium at an angular resolution of 0.65"x0.52" (∼120x98pc) through our observations of 12CO 2-1 emission using the Submillimeter Array (SMA). We compare our 12CO 2-1 maps with the optical Hubble Space Telescope and high angular resolution radio continuum images to study the relationship between molecular gas and the other components of the starburst region. The molecular gas is tracing the complicated dust lane structure of NGC 4194 with the brightest emission being located in an off-nuclear ring-like structure with ∼320pc radius, the Eye of the Medusa. The bulk CO emission of the ring is found south of the kinematical center of NGC 4194. The northern tip of the ring is associated with the galaxy nucleus, where the radio continuum has its peak. Large velocity widths associated with the radio nucleus support the notion of NGC 4194 hosting an active galactic nucleus. A prominent, secondary emission maximum in the radio continuum is located inside the molecular ring. This suggests that the morphology of the ring is partially influenced by massive supernova explosions. From the combined evidence, we propose that the Eye of the Medusa contains a shell of swept up material where we identify a number of giant molecular associations. We propose that the Eye may be the site of an efficient starburst of 5-7M/yr, but it would still constitute only a fraction of the 30-50M/yr star formation rate of the Medusa. Furthermore, we find that ∼50% of the molecular mass of NGC 4194 is found in extended filamentary-like structures tracing the minor and major axis dust lanes. We suggest that molecular gas is transported along these lanes, providing the central starburst region with fuel. Interestingly, a comparison with locations of super star clusters (SSCs) reveal that the molecular gas and the SSCs are not co-spatial.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: individual: NGC 4194 - galaxies: starburst - galaxies: active - radio lines: ISM - ISM: molecules

Simbad objects: 22

goto Full paper

goto View the reference in ADS

Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3002 2
2 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1201 3
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1562 2
4 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 611 0
5 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1155 1
6 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2060 1
7 ICRF J092703.0+390220 Sy1 09 27 03.0139516273 +39 02 20.847968628   17.17 17.00 16.486   ~ 937 1
8 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4044 5
9 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5430 6
10 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 351 1
11 NGC 3729 GiP 11 33 49.321 +53 07 31.79   12.2       ~ 179 1
12 8C 1150+812 QSO 11 53 12.49919940 +80 58 29.1545750     18.5 18.54   ~ 225 1
13 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 419 2
14 NGC 4441 GiG 12 27 20.402 +64 48 05.64   13.5       ~ 70 0
15 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1818 3
16 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3893 4
17 NGC 5216 GiP 13 32 06.9096470880 +62 42 02.417160507   16.80 16.14     ~ 111 0
18 NGC 5218 GiP 13 32 10.4287653669 +62 46 04.126116981   13.1       ~ 147 1
19 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2280 2
20 NGC 5248 GiG 13 37 32.069 +08 53 06.22   11.4       ~ 456 0
21 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2727 4
22 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2557 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2014A&A...569A...6K and select 'bookmark this link' or equivalent in the popup menu


2021.03.06-16:52:12

© Université de Strasbourg/CNRS

    • Contact