Off-Nuclear Star Formation and Obscured Activity in the Luminous Infrared Galaxy NGC 2623

Evans, A. S.; Vavilkin, T.; Pizagno, James; Modica, F.; Mazzarella, J. M.; Iwasawa, K.; Howell, Justin; Surace, J.; Armus, L.; Petric, Andreea; Spoon, H. W. W.; Barnes, Joshua E.; Suer, Terry Ann; Sanders, D. B.; Chan, Ben; Lord, S. D.

doi:10.1086/533499

Cited by 45 publications

(54 citation statements)

References 27 publications

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“…A.1). When considering only the optical colours, our results are in agreement with Evans et al (2008). However, we find that the age estimates can be improved by including the UV data.…”

Section: Merger-induced Star Formation and Evolutionary Schemesupporting

confidence: 86%

“…In NGC 2623 the vast majority of the ionized gas emission comes from the nuclear regions. Outside the nuclear regions, we detect three star forming clusters to the south, in the cluster-rich region found by Evans et al (2008). The latter represents the youngest of the ∼100 clusters in this region.…”

Section: Ionized Gas Emissionmentioning

confidence: 61%

“…We point out that in our spatially resolved observations, the emission lines do not show Seyfert-like line ratios, not even in the nuclear region (see also following section). Although X-ray and IR data point to the existence of an AGN embedded in dust within the inner kiloparsec of the system, the bulk of infrared (and thus bolometric) luminosity is generated by star formation (Evans et al 2008;Petric et al 2011).…”

Section: Emission Line Ratios Sensitive To Ionization Sourcementioning

confidence: 99%

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The spatially resolved stellar population and ionized gas properties in the merger LIRG NGC 2623

Cortijo-Ferrero

Delgado

Pérez

et al. 2017

A&A

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We report on a detailed study of the stellar populations and ionized gas properties in the merger LIRG NGC 2623, analyzing optical integral field spectroscopy from the CALIFA survey and PMAS LArr, multiwavelength HST imaging, and OSIRIS narrow band Hα and [NII]λ6584 imaging. The spectra were processed with the starlight full spectral fitting code, and the results are compared with those for two early-stage merger LIRGs (IC 1623 W and NGC 6090), together with CALIFA Sbc/Sc galaxies. We find that NGC 2623 went through two periods of increased star formation (SF), a first and widespread episode, traced by intermediate-age stellar populations ISP (140 Myr-1.4 Gyr), and a second one, traced by young stellar populations YSP (<140 Myr), which is concentrated in the central regions (<1.4 kpc). Our results are in agreement with the epochs of the first peri-center passage (∼200 Myr ago) and coalescence (<100 Myr ago) predicted by dynamical models, and with high-resolution merger simulations in the literature, consistent with NGC 2623 representing an evolved version of the early-stage mergers. Most ionized gas is concentrated within <2.8 kpc, where LINER-like ionization and high-velocity dispersion (∼220 km s −1 ) are found, consistent with the previously reported outflow. As revealed by the highest-resolution OSIRIS and HST data, a collection of HII regions is also present in the plane of the galaxy, which explains the mixture of ionization mechanisms in this system. It is unlikely that the outflow in NGC 2623 will escape from the galaxy, given the low SFR intensity (∼0.5 M ⊙ yr −1 kpc −2 ), the fact that the outflow rate is three times lower than the current SFR, and the escape velocity in the central areas is higher than the outflow velocity.

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“…A.1). When considering only the optical colours, our results are in agreement with Evans et al (2008). However, we find that the age estimates can be improved by including the UV data.…”

Section: Merger-induced Star Formation and Evolutionary Schemesupporting

confidence: 86%

Section: Ionized Gas Emissionmentioning

confidence: 61%

Section: Emission Line Ratios Sensitive To Ionization Sourcementioning

confidence: 99%

See 1 more Smart Citation

The spatially resolved stellar population and ionized gas properties in the merger LIRG NGC 2623

Cortijo-Ferrero

Delgado

Pérez

et al. 2017

A&A

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“…HST images reveal a remarkable complex of ∼100 super star clusters located predominantly in a region that extends over 3 kpc south of the nucleus in the advanced merger system NGC 2623 (Evans et al 2008). The star clusters have absolute magnitudes similar to those observed in the well-studied Antennae galaxies, and comparison of the broadband colors with population synthesis models indicates ages of 1-100 Myr.…”

Section: Detailed Multiwavelength Studies Of Individual Systemsmentioning

confidence: 72%

AGN and Starbursts in Dusty Galaxy Mergers: Insights from the Great Observatories All-sky LIRG Survey

Mazzarella

2013

Proc. IAU

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Abstract. The Great Observatories All-sky LIRG Survey (GOALS) is combining imaging and spectroscopic data from the Herschel, Spitzer, Hubble, GALEX, Chandra, and XMM-Newton space telescopes augmented with extensive ground-based observations in a multiwavelength study of approximately 180 Luminous Infrared Galaxies (LIRGs) and 20 Ultraluminous Infrared Galaxies (ULIRGs) that comprise a statistically complete subset of the 60μm-selected IRAS Revised Bright Galaxy Sample. The objects span the full range of galaxy environments (giant isolated spirals, wide and close pairs, minor and major mergers, merger remnants) and nuclear activity types (Seyfert 1, Seyfert 2, LINER, starburst/HII), with proportions that depend strongly on the total infrared luminosity. I will review the science motivations and present highlights of recent results selected from over 25 peer-reviewed journal articles published recently by the GOALS Team. Statistical investigations include detection of high-ionization Fe K emission indicative of deeply embedded AGN, comparison of UV and far-IR properties, investigations of the fraction of extended emission as a function of wavelength derived from mid-IR spectroscopy, mid-IR spectral diagnostics and spectral energy distributions revealing the relative contributions of AGN and starbursts to powering the bolometric luminosity, and quantitative structure analyses that delineate the evolution of stellar bars and nuclear stellar cusps during the merger process. Multiwavelength dissections of individual systems have unveiled large populations of young star clusters and heavily obscured AGN in early-stage (II Zw 96), intermediate-stage (Mrk 266, Mrk 273), and late-stage (NGC 2623, IC 883) mergers. A recently published study that matches numerical simulations to the observed morphology and gas kinematics in mergers has placed four systems on a timeline spanning 175-260 million years after their first passages, and modeling of additional (U)LIRGs is underway. A very brief description of ongoing work with Herschel and ALMA will be given. The talk will conclude with a discussion of the demographics of dual AGN (kpc-scale orbits) in the GOALS sample, including the difficulty of their detection and confirmation, a proposed sequence representing a progression from dual AGN to binary AGNs (sub-pc scale orbits), and implications for the scarcity of confirmed binary QSOs in recent large surveys. Grant support from NASA is gratefully acknowledged.

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“…An outline of the GOALS project and a multi-wavelength analysis of the LIRG VV340 are given in Armus et al (2009). Evans et al (2008) and Inami et al (2010) present a similar multi-wavelength analysis of LIRGs NGC 2623 and CGCG448-020, respectively. Howell et al (2010) compares the IR and UV properties of LIRGs and Díaz-Santos et al (2010) discusses the extent of the MIR emission across a large sample of LIRGs.…”

Section: Introductionmentioning

confidence: 99%

Mid-Infrared Spectral Diagnostics of Luminous Infrared Galaxies

Petric¹

2010

AIP Conference Proceedings

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We present a statistical analysis of the mid-infrared (MIR) spectra of 248 luminous infrared (IR) galaxies (LIRGs) which comprise the Great Observatories All-sky LIRG Survey (GOALS) observed with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. The GOALS sample enables a direct measurement of the relative contributions of star formation and active galactic nuclei (AGNs) to the total IR emission from a large sample of local LIRGs. The AGN contribution to the MIR emission (f AGN ) is estimated by employing several diagnostics based on the properties of the [Ne v], [O iv], and [Ne ii] fine-structure gas emission lines, the 6.2 μm polycyclic aromatic hydrocarbon (PAH), and the shape of the MIR continuum. We find that 18% of all LIRGs contain an AGN and that in 10% of all sources the AGN contributes more than 50% of the total IR luminosity. Summing up the total IR luminosity contributed by AGNs in all our sources suggests that AGNs supply ∼12% of the total energy emitted by LIRGs. The average spectrum of sources with an AGN looks similar to the average spectrum of sources without an AGN, but it has lower PAH emission and a flatter MIR continuum. AGN-dominated LIRGs have higher IR luminosities, warmer MIR colors, and are found in interacting systems more often than pure starburst LIRGs. However, we find no linear correlations between these properties and f AGN . We used the IRAC colors of LIRGs to confirm that finding AGNs on the basis of their MIR colors may miss ∼40% of AGN-dominated (U)LIRGs.

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Off-Nuclear Star Formation and Obscured Activity in the Luminous Infrared Galaxy NGC 2623

Cited by 45 publications

References 27 publications

The spatially resolved stellar population and ionized gas properties in the merger LIRG NGC 2623

The spatially resolved stellar population and ionized gas properties in the merger LIRG NGC 2623

AGN and Starbursts in Dusty Galaxy Mergers: Insights from the Great Observatories All-sky LIRG Survey

Mid-Infrared Spectral Diagnostics of Luminous Infrared Galaxies

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