New Results on the Structure and Stellar Content of the Outer Regions of the SMC

1991 ◽  
pp. 51-52
Author(s):  
L. T. Gardiner ◽  
M. R. S. Hawkins
Keyword(s):  
Stellar Content

Central kiloparsec of NGC 1326 observed with SINFONI

2020 ◽  
Vol 638 ◽  
pp. A53
Author(s):  
Nastaran Fazeli ◽  
Gerold Busch ◽  
Andreas Eckart ◽  
Françoise Combes ◽  
Persis Misquitta ◽  
...  
Keyword(s):  
Black Hole ◽  
Galaxy Evolution ◽  
Near Infrared ◽  
Velocity Fields ◽  
Molecular Gas ◽  
Nearby Galaxy ◽  
Stellar Content ◽  
Stellar Rotation ◽  
Supermassive Black Hole ◽  
Integral Field Spectrograph

Gas inflow processes in the vicinity of galactic nuclei play a crucial role in galaxy evolution and supermassive black hole growth. Exploring the central kiloparsec of galaxies is essential to shed more light on this subject. We present near-infrared H- and K-band results of the nuclear region of the nearby galaxy NGC 1326, observed with the integral-field spectrograph SINFONI mounted on the Very Large Telescope. The field of view covers 9″ × 9″ (650 × 650 pc2). Our work is concentrated on excitation conditions, morphology, and stellar content. The nucleus of NGC 1326 was classified as a LINER, however in our data we observed an absence of ionised gas emission in the central r ∼ 3″. We studied the morphology by analysing the distribution of ionised and molecular gas, and thereby detected an elliptically shaped, circum-nuclear star-forming ring at a mean radius of 300 pc. We estimate the starburst regions in the ring to be young with dominating ages of < 10 Myr. The molecular gas distribution also reveals an elongated east to west central structure about 3″ in radius, where gas is excited by slow or mild shock mechanisms. We calculate the ionised gas mass of 8 × 105 M⊙ completely concentrated in the nuclear ring and the warm molecular gas mass of 187 M⊙, from which half is concentrated in the ring and the other half in the elongated central structure. The stellar velocity fields show pure rotation in the plane of the galaxy. The gas velocity fields show similar rotation in the ring, but in the central elongated H2 structure they show much higher amplitudes and indications of further deviation from the stellar rotation in the central 1″ aperture. We suggest that the central 6″ elongated H2 structure might be a fast-rotating central disc. The CO(3–2) emission observations with the Atacama Large Millimeter/submillimeter Array reveal a central 1″ torus. In the central 1″ of the H2 velocity field and residual maps, we find indications for a further decoupled structure closer to a nuclear disc, which could be identified with the torus surrounding the supermassive black hole.

The Stellar Content of the Local Group Dwarf Galaxy Phoenix

1999 ◽  
Vol 118 (2) ◽  
pp. 862-882 ◽  
Author(s):  
D. Martínez-Delgado ◽  
C. Gallart ◽  
A. Aparicio
Keyword(s):  
Local Group ◽  
Dwarf Galaxy ◽  
Stellar Content

scholarly journals Mid-Ir Emission of Low-Metallicity Galaxies

1998 ◽  
Vol 11 (1) ◽  
pp. 113-114
Author(s):  
S. Plante ◽  
M. Sauvage ◽  
D. Kunth
Keyword(s):  
Stellar Content ◽  
Ionized Gas ◽  
Band Ratio ◽  
Hii Region ◽  
Stellar Photometry ◽  
North East ◽  
The North ◽  
Low Metallicity ◽  
Ir Emission ◽  
Exact Origin

NGC 595 is a giant Hɪɪ region located in the western part of the spiral galaxy M 33. It is the second in importance in this galaxy, after NGC 604. At 0.84 Mpc, HST is able to resolve its stellar content. Malumuth et al. (1996) obtained HST UV, U, B and V images of this region and derived an ionizing luminosity of 5 × 1050 phots-1 and an average reddening EB-V = 0.36±0.28 mag. The stars are mostly concentrated in the central part of the region, where little emission of gas is seen (the ionized gas lies more in a shell around the stars, figure 1a). Wilson & Scoville (1993) showed the molecular gas to be situated in the south-east part of the region, just outside of the bright knot of stars. Viallefond et al. (1986) found a reddening gradient in the north-east/south-west direction by observing the Hi gas, which was confirmed by Malumuth et al. (1996) with stellar photometry. We obtained ISO images for NGC 595 in the 5.0 to 8.5 μm range. The emission in this spectral range is dominated by the so-called PAH bands. Current interpretation of these has them originating from stochastically heated molecules. Two of these bands are located in the range observed, at 6.2 μm and 7.7 μm. Stochastic heating implies that the in-band flux is directly proportional to the number of photons absorbed by the molecules. For typical HII regions, Cohen et al. (1989) found 0.58 for the I6.2/I7.7 in-band ratio. However many processes, ionization, dehydrogenation, can modify this ratio. Furthermore, an underlying continuum is present though its exact origin is unknown.

scholarly journals The stellar content of the Hamburg/ESO survey

2001 ◽  
Vol 375 (2) ◽  
pp. 366-374 ◽  
Author(s):  
N. Christlieb ◽  
P. J. Green ◽  
L. Wisotzki ◽  
D. Reimers
Keyword(s):  
Stellar Content

scholarly journals The Stellar Content of 10 Dwarf Irregular Galaxies

1998 ◽  
Vol 116 (6) ◽  
pp. 2886-2915 ◽  
Author(s):  
Regina E. Schulte-Ladbeck ◽  
Ulrich Hopp
Keyword(s):  
Stellar Content ◽  
Irregular Galaxies ◽  
Dwarf Irregular Galaxies

scholarly journals Very low-mass stellar content of the young supermassive Galactic star cluster Westerlund 1

2017 ◽  
Vol 602 ◽  
pp. A22 ◽  
Author(s):  
M. Andersen ◽  
M. Gennaro ◽  
W. Brandner ◽  
A. Stolte ◽  
G. de Marchi ◽  
...  
Keyword(s):  
Star Cluster ◽  
Stellar Content ◽  
Low Mass

scholarly journals STAR FORMATION AND YOUNG STELLAR CONTENT IN THE W3 GIANT MOLECULAR CLOUD

2011 ◽  
Vol 743 (1) ◽  
pp. 39 ◽  
Author(s):  
Alana Rivera-Ingraham ◽  
Peter G. Martin ◽  
Danae Polychroni ◽  
Toby J. T. Moore
Keyword(s):  
Star Formation ◽  
Molecular Cloud ◽  
Stellar Content ◽  
Giant Molecular Cloud

scholarly journals Radial Age and Metal Abundance Gradients in the Stellar Content of M32

2005 ◽  
Vol 129 (2) ◽  
pp. 712-728 ◽  
Author(s):  
James A. Rose ◽  
Nobuo Arimoto ◽  
Nelson Caldwell ◽  
Ricardo P. Schiavon ◽  
Alexandre Vazdekis ◽  
...  
Keyword(s):  
Stellar Content ◽  
Metal Abundance

scholarly journals THE STRUCTURE AND STELLAR CONTENT OF THE OUTER DISKS OF GALAXIES: A NEW VIEW FROM THE Pan-STARRS1 MEDIUM DEEP SURVEY

2015 ◽  
Vol 800 (2) ◽  
pp. 120 ◽  
Author(s):  
Zheng Zheng ◽  
David A. Thilker ◽  
Timothy M. Heckman ◽  
Gerhardt R. Meurer ◽  
W. S. Burgett ◽  
...  
Keyword(s):  
Stellar Content ◽  
Deep Survey ◽  
New View
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