Chang-Es. Vii. Magnetic Outflows From the Virgo Cluster Galaxy NGC 4388

Damas-Segovia, Ancor; Beck, Rainer; Vollmer, B.; Wiegert, Theresa; Krause, M.; Irwin, Judith A.; Weżgowiec, M.; Li, Jiangtao; Dettmar, R.‐J.; English, Jayanne; Wang, Q. Daniel

doi:10.3847/0004-637x/824/1/30

Cited by 39 publications

(44 citation statements)

References 55 publications

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“…Examples are NGC 4388 (e.g. Hummel & Saikia 1991;Damas-Segovia et al 2016, among others) and NGC 3079 (Hummel, Van Gorkom, & Kotanyi 1984, and others) and these are also seen in the panels of Appendix B. Fig.…”

Section: Jets/lobesmentioning

confidence: 87%

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

Irwin

Wiegert

Merritt

et al. 2019

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The CHANG-ES galaxy sample consists of 35 nearby edge-on galaxies that have been observed using the VLA at 1.6 GHz and 6.0 GHz. Here we present the 3rd data release of our sample, namely the B-configuration 1.6 GHz sample. In addition, we make available the band-to-band spectral index maps between 1.6 GHz and 6.0 GHz, the latter taken in the matching resolution C-configuration. The images can be downloaded from https://www.queensu.ca/changes. These are our highest resolution images (≈ 3 arcsec) and we examine the possible presence of low luminosity active galactic nuclei in the sample as well as some in-disk structure. New features can be seen in the spectral index maps that are masked in the total intensity emission, including hidden spiral arms in NGC 3448 and two previously unknown radio lobes on either side of the nucleus of NGC 3628. Our AGN detection rate, using only radio criteria, is 55% which we take as a lower limit because some weaker embedded AGNs are likely present which could be revealed at higher resolution. Archival XMM-Newton data were used to search for further fingerprints of the AGNs in the studied sample. In galaxy disks, discrete regions of flat spectral index are seen, likely due to a thermal emission fraction that is higher than the global average.

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Section: Jets/lobesmentioning

confidence: 87%

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

Irwin

Wiegert

Merritt

et al. 2019

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“…Dust extinction effects decrease with increasing wavelength, and so IR emission should be largely unaffected. The Continuum Halos in Nearby Galaxies -an EVLA Survey (CHANG-ES; Irwin et al 2012aIrwin et al ,b, 2013Wiegert et al 2015;Irwin et al 2015;Li et al 2016;Damas-Segovia et al 2016;Irwin et al 2016) aims to establish the connection between star formation in galaxy disks and non-thermal processes, like halo magnetic fields, CR injection and propagation, and active galactic nuclei (AGN). To accomplish this goal, CHANG-ES has observed 35 highly-inclined galaxies in the nearby universe with the NSF's Karl G. Jansky Very Large Array (VLA) in B, C, and D configurations.…”

Section: Introductionmentioning

confidence: 99%

CHANG-ES X: Spatially Resolved Separation of Thermal Contribution from Radio Continuum Emission in Edge-on Galaxies

Vargas

Mora-Partiarroyo

Schmidt

et al. 2018

ApJ

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We analyze the application of star formation rate (SFR) calibrations using Hα and 22 micron infrared imaging data in predicting the thermal radio component for a test sample of 3 edge-on galaxies (NGC 891, NGC 3044, and NGC 4631) in the Continuum Halos in Nearby Galaxies -an EVLA Survey (CHANG-ES). We use a mixture of Hα and 24 micron calibration from Calzetti et al. (2007), and a linear 22 micron only calibration from Jarrett et al. (2013) on the test sample. We apply these relations on a pixel-to-pixel basis to create thermal prediction maps in the two CHANG-ES bands: Land C-band (1.5 GHz and 6.0 GHz, respectively). We analyze the resulting non-thermal spectral index maps, and find a characteristic steepening of the non-thermal spectral index with vertical distance from the disk after application of all methods. We find possible evidence of extinction in the 22 micron data as compared to 70 micron Spitzer Multband Imaging Photometer (MIPS) imaging in NGC 891. We analyze a larger sample of edge-on and face-on galaxy 25 micron to 100 micron flux ratios, and find that the ratios for edge-ons are systematically lower by a factor of 1.36, a result we attribute to excess extinction in the mid-IR in edge-ons. We introduce a new calibration for correcting the Hα luminosity for dust when galaxies are edge-on or very dusty.

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“…Damas-Segovia et al (2016) reported a southern jet with a scale of 1 kpc. Extended radio emission is observed in our 33 GHz map with a P.A.…”

Section: J2000mentioning

confidence: 99%

Radio continuum of galaxies with H₂O megamaser disks: 33 GHz VLA data

Kamali

Henkel

Brunthaler

et al. 2017

A&A

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Context. Galaxies with H 2 O megamaser disks are active galaxies in whose edge-on accretion disks 22 GHz H 2 O maser emission has been detected. Because their geometry is known, they provide a unique view into the properties of active galactic nuclei. Aims. The goal of this work is to investigate the nuclear environment of galaxies with H 2 O maser disks and to relate the maser and host galaxy properties to those of the radio continuum emission of the galaxy. Methods. The 33 GHz (9 mm) radio continuum properties of 24 galaxies with reported 22 GHz H 2 O maser emission from their disks are studied in the context of the multiwavelength view of these sources. The 29-37 GHz Ka-band observations are made with the Jansky Very Large Array in B, CnB, or BnA configurations, achieving a resolution of ∼ 0.2 -0.5 arcseconds. Hard X-ray data from the Swift/BAT survey and 22 µm infrared data from WISE, 22 GHz H 2 O maser data and 1.4 GHz data from NVSS and FIRST surveys are also included in the analysis. Results. Eighty-seven percent (21 out of 24) galaxies in our sample show 33 GHz radio continuum emission at levels of 4.5 -240 σ. Five sources show extended emission (deconvolved source size larger than 2.5 times the major axis of the beam), including one source with two main components and one with three main components. The remaining detected 16 sources (and also some of the above-mentioned targets) exhibit compact cores within the sensitivity limits. Little evidence is found for extended jets (>300 pc) in most sources. Either they do not exist, or our chosen frequency of 33 GHz is too high for a detection of these supposedly steep spectrum features. In only one source among those with known maser disk orientation, NGC 4388, did we find an extended jet-like feature that appears to be oriented perpendicular to the H 2 O megamaser disk. NGC 2273 is another candidate whose radio continuum source might be elongated perpendicular to the maser disk. Smaller 100-300 pc sized jets might also be present, as is suggested by the beam-deconvolved morphology of our sources. Whenever possible, central positions with accuracies of 20-280 mas are provided. A correlation analysis shows that the 33 GHz luminosity weakly correlates with the infrared luminosity. The 33 GHz luminosity is anticorrelated with the circular velocity of the galaxy. The black hole masses show stronger correlations with H 2 O maser luminosity than with 1.4 GHz, 33 GHz, or hard X-ray luminosities. Furthermore, the inner radii of the disks show stronger correlations with 1.4 GHz, 33 GHz, and hard X-ray luminosities than their outer radii, suggesting that the outer radii may be affected by disk warping, star formation, or peculiar density distributions.

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Chang-Es. Vii. Magnetic Outflows From the Virgo Cluster Galaxy NGC 4388

Cited by 39 publications

References 55 publications

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

CHANG-ES X: Spatially Resolved Separation of Thermal Contribution from Radio Continuum Emission in Edge-on Galaxies

Radio continuum of galaxies with H₂O megamaser disks: 33 GHz VLA data

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Chang-Es. Vii. Magnetic Outflows From the Virgo Cluster Galaxy NGC 4388

Cited by 39 publications

References 55 publications

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

CHANG-ES X: Spatially Resolved Separation of Thermal Contribution from Radio Continuum Emission in Edge-on Galaxies

Radio continuum of galaxies with H2O megamaser disks: 33 GHz VLA data

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Radio continuum of galaxies with H₂O megamaser disks: 33 GHz VLA data