LZIFU: an emission-line fitting toolkit for integral field spectroscopy data

Ho, I-Ting; Medling, Anne M.; Groves, Brent; Rich, Jeffrey A.; Rupke, David S. N.; Hampton, Elise; Kewley, Lisa J.; Bland-Hawthorn, Joss; Croom, S. M.; Richards, Samuel N.; Schaefer, Adam L.; Sharp, Robert; Sweet, Sarah M.

doi:10.1007/s10509-016-2865-2

Cited by 99 publications

(81 citation statements)

References 58 publications

(82 reference statements)

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“…In a first instance, we applied the likelihood ratio test to our data (Eq. 1 in Ho et al 2016), obtaining however mixed results, in some cases in obvious contradiction with reality. We thus decided to select the spectra with double components based on visual inspection.…”

Section: Kinematics Of the Gasmentioning

confidence: 90%

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An Interacting Galaxy Pair at the Origin of a Light Echo

Merluzzi

Busarello

Dopita

et al. 2018

ApJ

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In a low-density region of the Shapley supercluster we identified an interacting galaxy pair at redshift z = 0.04865 in which the Seyfert-2 nucleus of the main galaxy (ShaSS 073) is exciting an extended emission line region (EELR, ∼ 170 kpc 2 ) in the disk of the less massive companion (ShaSS 622). New integral-field spectroscopy and the multi-band data-set, spanning from far-ultraviolet to far-infrared and radio wavelengths, allowed us to obtain a detailed description of the ShaSS 622-073 system. The gas kinematics shows hints of interaction, although the overall velocity field shows a quite regular rotation in both galaxies, thus suggesting that we are observing their first encounter as confirmed by the estimated distance of 21 kpc between the two galaxy centers. The detected ∼ 2 − 3 kpc AGN outflow and the geometry of the EELR in ShaSS 622 support the presence of a hollow bi-cone structure. The status and sources of the ionization across the whole system have been analysed through photoionization models and a Bayesian approach which prove a clear connection between the AGN and the EELR. The luminosity of the AGN (2.4 × 10 44 erg s −1 ) is a factor 20 lower than the power needed to excite the gas in the EELR (4.6×10 45 erg s −1 ) indicating a dramatic fading of the AGN in the last 3 × 10 4 yr. ShaSS 073-622 provides all the ingredients listed in the recipe of a light echo where a high-ionised region maintains memory of a preceding more energetic phase of a now faded AGN. This is the first case of a light echo observed between two galaxies.

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Section: Kinematics Of the Gasmentioning

confidence: 90%

“…The statistical significance of decomposition in spectral fitting has been extensively discussed in the literature (e.g. Ho et al 2016). In a first instance, we applied the likelihood ratio test to our data (Eq.…”

Section: Kinematics Of the Gasmentioning

confidence: 99%

An Interacting Galaxy Pair at the Origin of a Light Echo

Merluzzi

Busarello

Dopita

et al. 2018

ApJ

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“…Following Kreckel et al (2016), we fit the stellar continuum with MIUSCAT templates (Vazdekis et al 2012) and measure emission lines using LZIFU (Ho et al 2016) assuming single Gaussian fits. These emission lines can serve as diagnostics for the mechanism that ionizes and excites the gas.…”

Section: Datamentioning

confidence: 99%

A Revised Planetary Nebula Luminosity Function Distance to NGC 628 Using Muse

Kreckel

Groves

Bigiel

et al. 2017

ApJ

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Distance uncertainties plague our understanding of the physical scales relevant to the physics of star formation in extragalactic studies. The planetary nebulae luminosity function (PNLF) is one of very few techniques that can provide distance estimates to within ∼10%, however it requires a planetary nebula (PN) sample that is uncontaminated by other ionizing sources. We employ optical IFU spectroscopy using MUSE on the VLT to measure [OIII] line fluxes for sources unresolved on 50 pc scales within the central star-forming galaxy disk of NGC 628. We use diagnostic line ratios to identify 62 PNe, 30 supernova remnants and 87 HII regions within our fields. Using the 36 brightest PNe we determine a new PNLF distance modulus of 29.91 +0.08 −0.13 mag (9.59 +0.35 −0.57 Mpc), in good agreement with literature values but significantly larger than the previously reported PNLF distance. We are able to explain the discrepancy and recover the previous result when we reintroduce SNR contaminants to our sample. This demonstrates the power of full spectral information over narrowband imaging in isolating PNe. Given our limited spatial coverage within the galaxy, we show that this technique can be used to refine distance estimates even when IFU observations cover only a fraction of a galaxy disk.

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“…Examples of these products are shown in Figure 10 for a selection of galaxies spanning the range of stellar masses in DR1. Ho et al (2016b). These fits include corrections for underlying stellar-continuum absorption.…”

Section: Emission-line Physics Value-addedmentioning

confidence: 99%

The SAMI Galaxy Survey: Data Release One with emission-line physics value-added products

Green

Croom

Scott

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the first major release of data from the SAMI Galaxy Survey. This data release focuses on the emission-line physics of galaxies. Data Release One includes data for 772 galaxies, about 20% of the full survey. Galaxies included have the redshift range 0.004 < z < 0.092, a large mass range (7.6 < log M * / M < 11.6), and star-formation rates of ∼ 10 −4 to ∼ 10 1 M yr −1 . For each galaxy, we include two spectral cubes and a set of spatially resolved 2D maps: single-and multicomponent emission-line fits (with dust extinction corrections for strong lines), local dust extinction and star-formation rate. Calibration of the fibre throughputs, fluxes and differential-atmosphericrefraction has been improved over the Early Data Release. The data have average spatial resolution of 2.16 arcsec (FWHM) over the 15 arcsec diameter field of view and spectral (kinematic) resolution R = 4263 (σ = 30 km s −1 ) around Hα. The relative flux calibration is better than 5% and absolute flux calibration better than ±0.22 mag, with the latter estimate limited by galaxy photometry. The data are presented online through the Australian Astronomical Observatory's Data Central.

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LZIFU: an emission-line fitting toolkit for integral field spectroscopy data

Cited by 99 publications

References 58 publications

An Interacting Galaxy Pair at the Origin of a Light Echo

An Interacting Galaxy Pair at the Origin of a Light Echo

A Revised Planetary Nebula Luminosity Function Distance to NGC 628 Using Muse

The SAMI Galaxy Survey: Data Release One with emission-line physics value-added products

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