scholarly journals Probing the circumnuclear stellar populations of starburst galaxies in the near-infrared

2014 ◽  
Vol 443 (2) ◽  
pp. 1754-1778 ◽  
Author(s):  
N. Z. Dametto ◽  
R. Riffel ◽  
M. G. Pastoriza ◽  
A. Rodríguez-Ardila ◽  
J. A. Hernandez-Jimenez ◽  
...  
Keyword(s):  
Near Infrared ◽  
Stellar Populations ◽  
Starburst Galaxies

Excitation Mechanism of Near‐Infrared [Feii] Emission in Seyfert and Starburst Galaxies

2000 ◽  
Vol 528 (1) ◽  
pp. 186-200 ◽  
Author(s):  
Hideaki Mouri ◽  
Kimiaki Kawara ◽  
Yoshiaki Taniguchi
Keyword(s):  
Near Infrared ◽  
Starburst Galaxies ◽  
Excitation Mechanism

scholarly journals Extragalactic GCs in the near-infrared: genuinely old in E/S0's?

2009 ◽  
Vol 5 (S262) ◽  
pp. 315-316
Author(s):  
Ana L. Chies-Santos ◽  
Søren S. Larsen
Keyword(s):  
Globular Cluster ◽  
Stellar Population ◽  
Near Infrared ◽  
Local Group ◽  
Stellar Populations ◽  
Age Dating ◽  
Early Type ◽  
Optical Photometry ◽  
Star Forming ◽  
Optical Images

Globular cluster (GC) systems are powerful probes to study the evolutionary histories of galaxies, being tracers of major star fomation episodes (Brodie & Strader 2006). They are found around all major galaxies and are easy to see far beyond the local group. Age dating GCs therefore helps pinpoint epochs of major star forming events. Spectroscopic age dating though (Strader et al. 2005) is extremely time consuming and can only access the few brightest clusters. An alternative is to combine near-infrared (NIR) and optical photometry, and therefore have a better chance in lifting the age metallicity degeneracy than with optical colours alone. This approach relies in testing GC colours against simple stellar population (SSP) models. The first studies following this technique showed the possible existence of a high percentage of intermediate age (2-3 Gyrs) GCs in early-type galaxies known to contain old stellar populations from integrated light studies. Two strong cases can be listed: NGC 4365 (Puzia et al. 2002, Larsen et al. 2005) and NGC 5846 (Hempel et al. 2003). In the present study we combine NIR deep photometry obtained with the WHT/LIRIS instrument and archival HST/ACS optical images to determine g(F475W), z(F840LP) and K(2.2m) magnitudes and colours of GCs in 14 early-type galaxies.

scholarly journals 30 Doradus as a Nearby Infrared Guide to Starbursts

1999 ◽  
Vol 190 ◽  
pp. 247-248 ◽  
Author(s):  
M. D. Thornley ◽  
N.M. Förster Schreiber ◽  
H.W.W. Spoon ◽  
R. Genzel ◽  
D. Lutz ◽  
...  
Keyword(s):  
Fine Structure ◽  
Short Wavelength ◽  
Massive Stars ◽  
Stellar Populations ◽  
Starburst Galaxies ◽  
Fine Structure Lines ◽  
30 Doradus

We are exploring the properties of obscured starburst galaxies, using observations of atomic fine structure lines taken with the Short Wavelength Spectrometer aboard ISO. However, it is important to ascertain how well our starburst models can recover the properties of the stellar populations in more distant starbursts. For this purpose, we use observations of a nebular “shell” in the 30 Doradus region, to show that our models reliably predict the presence of the very massive stars observed directly in the 30 Doradus region.

scholarly journals Near-Infrared Stellar Populations in the metal-poor, Dwarf irregular Galaxies Sextans A and Leo A

2018 ◽  
Vol 14 (S343) ◽  
pp. 429-430
Author(s):  
Olivia C. Jones ◽  
Matthew T. Maclay ◽  
Martha L. Boyer ◽  
Margaret Meixner ◽  
Iain McDonald
Keyword(s):  
Near Infrared ◽  
Infrared Camera ◽  
Stellar Populations ◽  
Asymptotic Giant Branch ◽  
Evolved Stars ◽  
Irregular Galaxies ◽  
Tentative Evidence ◽  
Period Variable ◽  
Red Giant ◽  
Dwarf Irregular Galaxies

AbstractWe present JHK observations of the metal-poor $$(\left[ {{\rm{Fe}}/{\rm{H}}} \right] < - 1.40)$$ dwarf-irregular galaxies, Leo A and Sextans A, obtained with the WIYN High-resolution Infrared Camera. Their near-IR stellar populations are characterized by using a combination of color-magnitude diagrams and by identifying long-period variable (LPV) stars. We detected red giant and asymptotic giant branch (AGB) stars, consistent with membership of the galaxy’s intermediate-age populations (2-8 Gyr old). We identify 32 dusty evolved stars in Leo A and 101 dusty stars in Sextans A, confirming that metal-poor stars can form substantial amounts of dust. We also find tentative evidence for oxygen-rich dust formation at low metallicity, contradicting previous models that suggest oxygen-rich dust production is inhibited in metal-poor environments. The majority of this dust is produced by a few very dusty evolved stars.

scholarly journals A near-infrared VISTA of the Small Magellanic Cloud

2018 ◽  
Vol 14 (S344) ◽  
pp. 53-56
Author(s):  
Maria-Rosa L. Cioni ◽  
Florian Niederhofer ◽  
Stefano Rubele ◽  
Ning-Chen Sun
Keyword(s):  
Near Infrared ◽  
Stellar Populations ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Level Of Detail ◽  
Star Formation History ◽  
Main Body ◽  
Small Magellanic Cloud ◽  
Formation History ◽  
The Galaxy

AbstractVISTA observed the Small Magellanic Cloud (SMC), as part of the VISTA survey of the Magellanic Clouds system (VMC), for six years (2010–2016). The acquired multi-epoch YJKs images have allowed us to probe the stellar populations to an exceptional level of detail across an unprecedented wide area in the near-infrared. This contribution highlights the most recent VMC results obtained on the SMC focusing, in particular, on the clustering of young stellar populations, on the proper motion of stars in the main body of the galaxy and on the spatial distribution of the star formation history.

Sign in / Sign up

Export Citation Format

Share Document