English
Related papers

Related papers: Complex central structures suggest complex evoluti…

200 papers

A catalogue of the morphological features for the complete Spitzer Survey of Stellar Structure in Galaxies (S$^4$G), including 2352 nearby galaxies, is presented. The measurements are made using 3.6 $\mu$m images, largely tracing the old…

Astrophysics of Galaxies · Physics 2015-10-21 M. Herrera-Endoqui , S. Díaz-García , E. Laurikainen , H. Salo

We present the results from a wide-field imaging study of globular cluster (GC) systems in three early-type galaxies. Combinations of Subaru/Suprime-Cam, CFHT/MegaCam and HST/WFPC2/ACS data were used to determine the GC system properties of…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Sreeja S. Kartha , Duncan A. Forbes , Lee R. Spitler , Aaron J. Romanowsky , Jacob A. Arnold , Jean P. Brodie

We investigate the stellar population properties of pseudo-bulges in barred galaxies drawn from the Sloan Digital Sky Survey (SDSS DR7) to assess how bars regulate central star formation and secular evolution. Our sample comprises barred…

Astrophysics of Galaxies · Physics 2026-04-21 Kavin Kumar N R , Saili Keshri , Sudhanshu Barway

Double bars have been proposed as a means of transporting molecular gas past inner Lindblad resonances into the nuclear regions, where it can fuel active or starburst nuclei. Thus far, the existence of double bars has been determined…

Astrophysics · Physics 2009-11-07 Glen Petitpas , Christine Wilson

Updating Kormendy & Kennicutt (2004, ARAA, 42, 603), we review internal secular evolution of galaxy disks. One consequence is the growth of pseudobulges that often are mistaken for true (merger-built) bulges. Many pseudobulges are…

Astrophysics · Physics 2008-10-16 John Kormendy , David B. Fisher

Optical red spectra of a set of 18 bright barred spiral galaxies are presented. The study is aimed at determining the local kinematics, and the physical conditions of ionized gas in the compact nucleus (inside a diameter of 5") and in the…

Astrophysics · Physics 2007-05-23 J. A. Garcia-Barreto , H. Aceves , O. Kuhn , G. Canalizo , R. Carrillo , J. Franco

[Abridged] We examine the physical properties of 173 cluster members in CL1358+62 (z=0.33) from HST WFPC2 imaging taken in the F606W & F814W filters (rest-frame B & V) over a 2.2x2.2 Mpc^2 field. Structural parameters are measured for each…

Astrophysics · Physics 2009-11-07 Kim-Vy Tran , Luc Simard , Garth Illingworth , Marijn Franx

We investigate possible environmental and morphological trends in the $z\sim0$ bar fraction using two carefully selected samples representative of a low-density environment (the isolated galaxies from the AMIGA sample) and of a dense…

Cosmology and Nongalactic Astrophysics · Physics 2011-11-08 Lea Giordano , Kim-Vy H. Tran , Ben Moore , Amelie Saintonge

There are only a few tracers available to probe the kinematics of individual early-type galaxies beyond one effective radius. Here we directly compare a sample of planetary nebulae (PNe), globular clusters (GCs) and galaxy starlight…

This study uses r-band images from the Eighth Data Release of the Sloan Digital Sky Survey (SDSS DR8) to study bars in lenticular (S0) galaxies in one of the nearest rich cluster environments, the Coma cluster. We develop techniques for bar…

Astrophysics of Galaxies · Physics 2015-06-18 George B. Lansbury , John R. Lucey , Russell J. Smith

We use 3.6 $\mu$m imaging from the S$^{4}$G survey to characterize the typical stellar density profiles ($\Sigma_{\ast}$) and bars as a function of fundamental galaxy parameters (e.g. the total stellar mass $M_{\ast}$), providing…

Astrophysics of Galaxies · Physics 2017-03-29 Simón Díaz-García , Heikki Salo , Eija Laurikainen

We present surface photometry for the central regions of a sample of 48 spiral galaxies (mostly unbarred and barred of types Sbc or Sc) observed with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. Surface…

We examine the nuclear morphology, kinematics, and stellar populations in nearby S0 galaxy NGC 404 using a combination of adaptive optics assisted near-IR integral-field spectroscopy, optical spectroscopy, and HST imaging. These…

NGC 6791 is a unique stellar cluster, key to our understanding of both the multiple stellar population phenomenon and the evolution and assembly of the Galaxy. However, despite many investigations, its nature is still very controversial.…

Astrophysics of Galaxies · Physics 2018-11-07 Sandro Villanova , Giovanni Carraro , Douglas Geisler , Lorenzo Monaco , Paulina Assmann

We use the bulge Sersic index n and bulge-to-total ratio (B/T) to explore the fundamental question of how bulges form. We perform 2D bulge-disk-bar decomposition on H-band images of 143 bright, high stellar mass (>1.0e10 solar masses)…

Astrophysics · Physics 2014-11-18 Tim Weinzirl , Shardha Jogee , Sadegh Khochfar , Andreas Burkert , John Kormendy

We present results of millimeter line observations toward four local gas-rich galaxies (NGC 3079, NGC 4258, NGC 6240 and VII Zw 31) with the IRAM 30 meter millimeter telescope. More than 33 lines in these four sources were detected,…

Astrophysics of Galaxies · Physics 2018-11-05 Fei Li , Junzhi Wang , Minzhi Kong , Shanghuo Li

We have used the EFAR sample of galaxies to study the light distributions of early-type galaxies. We decompose the 2D light distribution of the galaxies in a flattened spheroidal component with a Sersic radial light profile and an inclined…

We present a SALT-RSS spectroscopic study of a sample of S0 galaxies established by Vaghmare et al. (2015) as having pseudobulges using a combination of photometric criteria. We extract the spectra of various regions along the galaxy major…

Astrophysics of Galaxies · Physics 2018-08-22 Kaustubh Vaghmare , Sudhanshu Barway , Petri Väisänen , Rajin Ramphul , Yogesh Wadadekar , Ajit Kembhavi

The discovery over the last several decades of moderate luminosity AGNs in disk-dominated galaxies - which show no "classical" bulges - suggests that secular mechanisms represent an important growth pathway for supermassive black holes in…

We present data for a sample of 45 spiral galaxies over a range of Hubble types, imaged in the near-IR J and K bands. Parameters are calculated describing the bulge, disk and bar K-band light distributions, and we look for correlations…

Astrophysics · Physics 2007-05-23 M. S. Seigar , P. A. James
‹ Prev 1 3 4 5 6 7 10 Next ›