GALFIT-CORSAIR: implementing the core-Sersic model into GALFIT

Abstract

We introduce GALFIT-CORSAIR: a publicly available, fully retro-compatible modification of the 2D fitting software GALFIT (v.3) which adds an implementation of the core-Sersic model. We demonstrate the software by fitting the images of NGC 5557 and NGC 5813, which have been previously identified as core-Sersic galaxies by their 1D radial light profiles. These two examples are representative of different dust obscuration conditions, and of bulge/disk decomposition. To perform the analysis, we obtained deep Hubble Legacy Archive (HLA) mosaics in the F555W filter (~V-band). We successfully reproduce the results of the previous 1D analysis, modulo the intrinsic differences between the 1D and the 2D fitting procedures. The code and the analysis procedure described here have been developed for the first coherent 2D analysis of a sample of core-Sersic galaxies, which will be presented in a forth-coming paper. As the 2D analysis provides better constraining on multi-component fitting, and is fully seeing-corrected, it will yield complementary constraints on the missing mass in depleted galaxy cores.

Accepted for publication in PASP; A binary version of GALFIT-CORSAIR is publicly available at http://astronomy.swin.edu.au/~pbonfini/galfit-corsair/

References in corpus (23)

• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of Fast and Slow Rotators
• A concise reference to (projected) Sersic R^{1/n} quantities, including Concentration, Profile Slopes, Petrosian indices, and Kron Magnitudes
• The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies
• HST photometry of dwarf elliptical galaxies in Coma, and an explanation for the alleged structural dichotomy between dwarf and bright elliptical galaxies
• The ATLAS3D project - II. Morphologies, kinemetric features and alignment between photometric and kinematic axes of early-type galaxies
• The Centers of Early-Type Galaxies with HST. V. New WFPC2 Photometry
• GEMS: Galaxy fitting catalogues and testing parametric galaxy fitting codes
• A New Empirical Model for the Structural Analysis of Early-type Galaxies and a Critical Review of the Nuker Model
• Evidence for a New Elliptical-Galaxy Paradigm: Sersic and Core Galaxies
• The Centers of Early-Type Galaxies with HST. VI. Bimodal Central Surface Brightness Profiles
• Mass Deficits, Stalling Radii, and the Merger Histories of Elliptical Galaxies
• BUDDA: A New Two-Dimensional Bulge/Disk Decomposition Code for Detailed Structural Analysis of Galaxies
• Image Decomposition of Barred Galaxies and AGN Hosts
• GALAPAGOS: From Pixels to Parameters
• Core depletion from coalescing supermassive black holes
• The ACS Fornax Cluster Survey. II. The Central Brightness Profiles of Early-Type Galaxies: A Characteristic Radius on Nuclear Scales and the Transition from Central Luminosity Deficit to Excess
• The Atlas-3D project - IX. The merger origin of a fast and a slow rotating Early-Type Galaxy revealed with deep optical imaging: first results
• Depleted cores, multi-component fits, and structural parameter relations for luminous early-type galaxies
• Detection of Radial Surface Brightness Fluctuation and Color Gradients in elliptical galaxies with ACS
• Central Stellar Mass Deficits in the Bulges of Local Lenticular Galaxies, and the Connection with Compact z ~ 1.5 Galaxies
• Sizing up Partially-Depleted Galaxy Cores
• The connection between radio-loudness and central surface brightness profiles in optically-selected low-luminosity active galaxies

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• Galaxy bulges and their massive black holes: a review
• A remarkably large depleted core in the Abell 2029 BCG IC 1101
• $Profiler$ - A Fast and Versatile New Program for Decomposing Galaxy Light Profiles
• The quest for the largest depleted galaxy core: supermassive black hole binaries and stalled in-falling satellites
• Reading the tea leaves in the $M_{\mathrm{bh}}$-$M_{\ast ,\mathrm{sph}}$ and $M_{\mathrm{bh}}$-$R_{\mathrm{e},\mathrm{sph}}$ diagrams: dry and gaseous mergers with remnant angular momentum
• The link between brightest cluster galaxy properties and large scale extensions of 38 DAFT/FADA and CLASH clusters in the redshift range 0.2<z<0.9
• Core shapes and orientations of core-Sersic galaxies
• Inside-out star formation quenching and the need for a revision of bulge-disk decomposition concepts for spiral galaxies
• Too big to be real? No depleted core in Holm 15A
• Modelling dust rings in early-type galaxies through a sequence of radiative transfer simulations and 2D image fitting
• A new fitting concept for the robust determination of Sérsic model parameters
• 2D Surface Brightness Modelling of Large 2MASS Galaxies I: Photometry and Structural Parameters
• Elliptical (E) and ellicular (ES) galaxies in the M_bh-M_*,sph diagram, and a merger-driven explanation for the origin of ES galaxies, anti-truncated stellar discs in lenticular galaxies, and the Sersicification of E galaxy light profiles