A photometric comprehensive study of circumnuclear star forming rings: the sample

Abstract

We present photometry in U, B, V, R and I continuum bands and in H$\alpha$ and H$\beta$ emission lines for a sample of 336 circumnuclear star forming regions (CNSFR) located in early type spiral galaxies with different levels of activity in their nuclei. They are nearby galaxies, with distances less than 100 Mpc, 60\% of which are considered as interacting objects. This survey of 20 nuclear rings aims to provide insight into their star formation properties as age, stellar population and star formation rate. Extinction corrected H$\alpha$ luminosities range from $1.3\times 10^{38}$ to $4\times 10^{41}erg{s}^{-1}$, with most of the regions showing values between 39.5 $\le logL(H\alpha )\le$ 40, which implies masses for the ionizing clusters higher than $2\times 10^5{M}_{\odot }$. H$\alpha$ and H$\beta$ images have allowed us to obtain an accurate measure of extinction. We have found an average value of A${}_V$ = 1.85 magnitudes. (U-B) colour follows a two maximum distribution around (U-B)$\simeq$ -0.7, and -0.3; (R-I) also presents a bimodal behaviour, with maximum values of 0.6 and 0.9. Reddest (U-B) and (R-I) regions appear in non-interacting galaxies. Reddest (R-I) regions lie in strongly barred galaxies. For a significant number of HII regions the observed colours and equivalent widths are not well reproduced by single burst evolutionary theoretical models.

Accepted for publication in MNRAS. Accepted 15 May 2015. Received, 21 April 2015

References in corpus (12)

• Optical Spectroscopy and Nebular Oxygen Abundances of the Spitzer/SINGS Galaxies
• Nuclear spirals as feeding channels to the Supermassive Black Hole: the case of the galaxy NGC 6951
• A Connection between Star Formation in Nuclear Rings and their Host Galaxies
• The metal abundance of circumnuclear star forming regions in early type spirals. Spectrophotometric observations
• Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
• Molecular gas in NUclei of GAlaxies (NUGA) XV. Molecular gas kinematics in the inner 3kpc of NGC6951
• Molecular gas in NUclei of GAlaxies (NUGA): VIII The Seyfert 2 NGC6574
• "Hidden" Seyfert 2 Galaxies in the Chandra Deep Field North
• The Radio Jet Interaction in NGC 5929: Direct Detection of Shocked Gas
• Multiwavelength study of the star formation in the bar of NGC 2903
• Optical detection of the radio supernova SN 2000ft in the circumnuclear region of the luminous infrared galaxy NGC 7469
• Detection of X-ray elongated emission from a ultraluminous X-ray source in the interacting pair of galaxies NGC 5953/5954

Cited by in corpus (10)

• Star formation in the dwarf Seyfert galaxy NGC 4395: Evidence for both AGN and SNe feedback?
• Constraining HeII Reionization Detection Uncertainties via Fast Radio Bursts
• Inner and outer star forming regions over the disks of spiral galaxies. I. Sample characterization
• Nuclear starburst activity induced by elongated bulges in spiral galaxies
• Chemical abundances in Seyfert galaxies -- VIII. Argon abundance estimates
• Inner and outer star forming regions over the disks of spiral galaxies. II. A comparative of physical properties and evolutionary stages
• Physical properties of circumnuclear ionising clusters. I. NGC 7742
• Physical properties of circumnuclear ionising clusters. II. NGC 7469
• Optical/Near-IR spatially resolved study of the H II galaxy Tol 02
• Chemical abundances in Seyfert galaxies -- VII. Direct abundance determination of neon based on optical and infrared emission lines