Tracking Galaxy Evolution Through Low-Frequency Radio Continuum Observations using SKA and Citizen-Science Research using Multi-Wavelength Data

Hota, Ananda; Konar, C.; Stalin, C. S.; Vaddi, Sravani; Mohanty, Pradeepta K.; Dabhade, Pratik; Bhoga, Sai Arun Dharmik; Rajoria, Megha; Sethi, Sagar

doi:10.1007/s12036-016-9415-8

Cited by 4 publications

(8 citation statements)

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“…Nevertheless, a few examples of spiral host radio galaxies are known such as J0313-192 (Ledlow et al 1998), Speca (Hota et al 2011), J0314-1906, J2345-0449, J0836+0532 and MCG+07-47-10 (Hota et al 2016. It is likely that such spiral host radio galaxies could be more frequent in the early Universe, prior to the quasar/radio galaxy era (z ∼ 2−3 ) and when spiral galaxies were more prevalent than the merger-remnant ellipticals (Hota et al 2016). Thus, this new object reported here SDSS J103024.95+551622.7, and hosted in a spiral galaxy may represent an opportunity to investigate non-standard modes of relativistic jet production in passively evolving galaxies with smaller black holes masses which may have been more common in the early Universe, prior to the rise of merger-remnant ellipticals and supermassive black holes.…”

Section: Link With Specamentioning

confidence: 99%

Rare Finding of a 100 Kpc Large, Double-lobed Radio Galaxy Hosted in the Narrow-line Seyfert 1 Galaxy SDSS J103024.95+551622.7

Rakshit

Stalin

Hota

et al. 2018

ApJ

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Among the large varieties of active galactic nuclei (AGN) known, narrow line Seyfert 1 (NLSy1) galaxies are a puzzling class, particularly after the discovery of γ-ray emission in a handful of them using observations from the Fermi Gamma-ray Space Telescope. Here, we report the discovery of a rare large double lobed radio source with its radio core associated with a NLSy1 galaxy SDSS J103024.95+551622.7 at z = 0.435. The lobe separation is 116 kpc which is the second largest known projected size among NLSy1 radio sources. This finding is based on the analysis of 1.4 GHz data from the Faint Images of the Radio Sky at Twenty-centimeters (FIRST) archives. Along with the core and edge-brightened lobes we detected significant (30%) fraction of clear diffuse emission showing typical back-flow from FR II radio galaxy lobes. For the source, we estimated a jet power of 3 × 10 44 erg s −1 suggesting that its jet power is similar to that of classical radio galaxies. Emission from the source is also found to be non-variable both in the optical and mid-infrared bands. Identification of more such sources may help to reveal new modes of AGN and understand their role in black hole galaxy evolution.

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Section: Link With Specamentioning

confidence: 99%

Rare Finding of a 100 Kpc Large, Double-lobed Radio Galaxy Hosted in the Narrow-line Seyfert 1 Galaxy SDSS J103024.95+551622.7

Rakshit

Stalin

Hota

et al. 2018

ApJ

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“…Hanny's Voorworp; Lintott et al 2009;Keel et al 2012), new sensitive radio surveys will unearth significant samples. Eventually in the era of Square Kilometre Array radio telescope, "smoking gun" evidences of AGN feedback in a sample can be found where age of the radio relic could possibly match the time-scale of decline in star formation in a post-merger early-type galaxy (Hota et al 2016).…”

Section: Discussionmentioning

confidence: 99%

“…RAD12 was discovered by RAD@home 1 citizen science research collaboratory as reported first in (Hota et al 2014). The innovative socio-scientific design of the RAD@home collaboratory is briefly described in Hota et al (2016). It is a zero-funded, zero-infrastructure, nationwide, Inter-University network of professional astronomers and trained citizen scientists (e-/i-astronomers) who are University students or citizens (irrespective of their age and profession) with University-level science education.…”

Section: Observation and Data Analysismentioning

confidence: 99%

“…63-091346.3, Abolfathi et al 2018) seen in optical and a fainter plume like linear radio emission was seen only on one side and extending directly towards the western galaxy (SDSS J004254.69-091349.4) which is also at the same redshift (𝑧) of 0.076. Hota et al (2016) suggested that it is unlike any head-tail radio galaxies or radio bridges in interacting Taffy galaxies, and the radio jet is likely interacting with the western galaxy but absence of the eastern jet needed further probing.…”

Section: Observation and Data Analysismentioning

confidence: 99%

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RAD@home citizen science discovery of an AGN spewing a large unipolar radio bubble onto its merging companion galaxy

Hota,

Dabhade,

Vaddi

et al. 2022

Preprint

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AGN feedback during galaxy merger has been the most favoured model to explain black hole-galaxy co-evolution. However, how the AGN-driven jet/wind/radiation is coupled with the gas of the merging galaxies, which leads to positive feedback, momentarily enhanced star formation, and subsequently negative feedback, a decline in star formation, is poorly understood. Only a few cases are known where the jet and companion galaxy interaction leads to minor off-axis distortions in the jets and enhanced star formation in the gas-rich minor companions. Here, we briefly report one extraordinary case, RAD12, discovered by RAD@home citizen science collaboratory, where for the first time a radio jet-driven bubble (∼ 137 kpc) is showing a symmetric reflection after hitting the incoming galaxy which is not a gas-rich minor but a gas-poor early-type galaxy in a major merger. Surprisingly, neither positive feedback nor any radio lobe on the counter jet side, if any, is detected. It is puzzling if RAD12 is a genuine one-sided jet or a case of radio lobe trapped, compressed and re-accelerated by shocks during the merger. This is the first imaging study of RAD12 presenting follow-up with the GMRT, archival MeerKAT radio data and CFHT optical data.

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“…(Salome et al 2016;Santoro et al 2015;Croft et al 2006;Evans et al 2008;Zovaro et al 2020). This is in contrast to the wellknown negative feedback that is required for AGNfeedback models to explain black hole galaxy coevolution (e.g., Springel et al 2005;Croton et al 2006;Hopkins et al 2006;Fabian 2012;Hota et al 2012Hota et al , 2016Hardcastle & Croston 2020). The second unique case, which is the focus of this manuscript, is in the 'Jellyfish' or 'Fireball' galaxy where the triggering mechanism is almost opposite.…”

Section: Introductionmentioning

confidence: 98%

The sharpest ultraviolet view of the star formation in an extreme environment of the nearest Jellyfish Galaxy IC 3418

et al. 2021

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We present the far ultraviolet (FUV) imaging of the nearest Jellyfish or Fireball galaxy IC3418/ VCC 1217, in the Virgo cluster of galaxies, using Ultraviolet Imaging Telescope (UVIT) onboard the AstroSat satellite. The young star formation observed here in the 17 kpc long turbulent wake of IC3418, due to ram pressure stripping of cold gas surrounded by hot intra-cluster medium, is a unique laboratory that is unavailable in the Milky Way. We have tried to resolve star forming clumps, seen compact to GALEX UV images, using better resolution available with the UVIT and incorporated UV-optical images from Hubble Space Telescope archive. For the first time, we resolve the compact star forming clumps (fireballs) into sub-clumps and subsequently into a possibly dozen isolated stars. We speculate that many of them could be blue supergiant stars which are cousins of SDSS J122952.66?112227.8, the farthest star (*17 Mpc) we had found earlier surrounding one of these compact clumps. We found evidence of star formation rate (4-7.4 9 10 -4 M yr -1 ) in these fireballs, estimated from UVIT flux densities, to be increasing with the distance from the parent galaxy. We propose a new dynamical model in which the stripped gas may be developing vortex street where the vortices grow to compact star forming clumps due to self-gravity. Gravity winning over turbulent force with time or length along the trail can explain the puzzling trend of higher star formation rate and bluer/younger stars observed in fireballs farther away from the parent galaxy.

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Tracking Galaxy Evolution Through Low-Frequency Radio Continuum Observations using SKA and Citizen-Science Research using Multi-Wavelength Data

Cited by 4 publications

References 97 publications

Rare Finding of a 100 Kpc Large, Double-lobed Radio Galaxy Hosted in the Narrow-line Seyfert 1 Galaxy SDSS J103024.95+551622.7

Rare Finding of a 100 Kpc Large, Double-lobed Radio Galaxy Hosted in the Narrow-line Seyfert 1 Galaxy SDSS J103024.95+551622.7

RAD@home citizen science discovery of an AGN spewing a large unipolar radio bubble onto its merging companion galaxy

The sharpest ultraviolet view of the star formation in an extreme environment of the nearest Jellyfish Galaxy IC 3418

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