Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of... more Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of low surface brightness radio lobes, known as ‘wings’ aligned at a certain angle with the primary jets. Depending on the location of wings, these galaxies look like X or Z and are known as X-shaped Radio Galaxy (XRG) or Z-shaped Radio Galaxy (ZRG). We report the identification of 33 winged radio sources from the LOFAR Two-metre Sky Survey First Data Release (LoTSS DR1) out of which 21 sources are identified as X-shaped radio galaxies and 12 as Z-shaped radio galaxies. Optical counterparts are identified for 14 XRGs (67 per cent) and 12 ZRGs (100 per cent). We studied various physical parameters of these sources like spectral index, radio luminosity and power. The radio spectrum of the majority of XRGs and ZRGs is steep (α 1400 > 0.5), which is typical of lobe dominated radio galaxies. The statistical studies are done on the relative size of the major and minor axes and the angle betwe...
Hybrid Morphology Radio Sources (HyMoRS) are a very rare and newly discovered subclass of radio g... more Hybrid Morphology Radio Sources (HyMoRS) are a very rare and newly discovered subclass of radio galaxies that have mixed FR morphology i.e., these galaxies have FR-I structure on one side of the core and FR-II structure on the other side of the core. We systematically searched for HyMoRS using VLA Faint Images of the Radio Sky at Twenty-cm (FIRST) survey at 1400 MHz and identified forty-five confirmed HyMoRS and five candidates HyMoRS. Our finding significantly increased the known sample size of HyMoRS. HyMoRS may play an essential role in understanding the interaction of jets with the interstellar medium and a very debated topic of the FR dichotomy. We identified optical/IR counterparts for thirty-nine sources in our catalogue. In our sample of sources, five sources had Quasar-like behavior. We had estimated the spectral index and radio luminosity of HyMoR sources in our catalogue, when possible. We found that the source J1336+2329 (logL = 26.93 W Hz−1sr−1) was the most luminous an...
The peculiar morphology of Head-Tail (HT) radio galaxies indicates strong interactions between th... more The peculiar morphology of Head-Tail (HT) radio galaxies indicates strong interactions between the radio jets and their intra-cluster medium. We systematically search for HT radio galaxies from LOFAR Two-metre Sky Survey first data release (LoTSS DR1) at 144 MHz frequency. We present here a catalogue of fifty new HT radio sources, among them, five are Narrow-Angle Tailed sources (NATs) and forty-five are Wide Angle Tailed sources (WATs). NATs are characterized by tails bent in a narrow ‘V’ like shape with less than a ninety-degree opening angle. For WAT radio galaxies, the opening angle between jets is more than ninety degrees which exhibit wide ‘C’ like morphologies. We found that thirty-one out of fifty HT sources are associated with known galaxy clusters. The various physical properties and statistical studies of these HT sources are also presented in this paper. Subject headings: galaxies: active – galaxies: jets – quasars: general – radio continuum: galaxies
The study of Head Tail (HT) radio galaxies track the information of associated galaxy clusters. W... more The study of Head Tail (HT) radio galaxies track the information of associated galaxy clusters. With the help of the VLA FIRST survey at 1.4 GHz, we detected 607 new HT radio sources, among them, 398 are Wide Angle Tail (WAT) and 216 are Narrow-Angle Tail (NAT) sources. NAT sources generally have ‘V’ shaped structure with an opening angle less than ninety degrees and for WAT sources opening angle between the jets is more than ninety degrees. We found that almost 80 per cent of our sources are associated with a known galaxy cluster. We mentioned various useful physical properties of these HT sources. Taking advantage of a large sample of newly discovered HT sources, various statistical studies have been done. The luminosity range of sources presented in the current paper is 10 ≤ L1.4GHz ≤ 10 erg sec−1. We identified optical counterparts for 193 WAT and 104 NAT sources. The sources are found up to redshift 2.08. Subject headings: galaxies: active – galaxies: formation – galaxies: jets...
Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of... more Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of low surface brightness radio lobes, known as 'wings' aligned at a certain angle with the primary jets. Depending on the location of wings, these galaxies look like X or Z and are known as X-shaped Radio Galaxy (XRG) or Z-shaped Radio Galaxy (ZRG). We report the identification of 33 winged radio sources from the LOFAR Two-metre Sky Survey First Data Release (LoTSS DR1) out of which 21 sources are identified as X-shaped radio galaxies and 12 as Z-shaped radio galaxies. Optical counterparts are identified for 14 XRGs (67 per cent) and 12 ZRGs (100 per cent). We studied various physical parameters of these sources like spectral index, radio luminosity and power. The radio spectrum of the majority of XRGs and ZRGs is steep (α 144 1400 > 0.5), which is typical of lobe dominated radio galaxies. The statistical studies are done on the relative size of the major and minor axes and the angle between the major axis and minor axis for XRGs.
Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of... more Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of low surface brightness radio lobes, known as ‘wings’ aligned at a certain angle with the primary jets. Depending on the location of wings, these galaxies look like X or Z and are known as X-shaped Radio Galaxy (XRG) or Z-shaped Radio Galaxy (ZRG). We report the identification of 33 winged radio sources from the LOFAR Two-metre Sky Survey First Data Release (LoTSS DR1) out of which 21 sources are identified as X-shaped radio galaxies and 12 as Z-shaped radio galaxies. Optical counterparts are identified for 14 XRGs (67 per cent) and 12 ZRGs (100 per cent). We studied various physical parameters of these sources like spectral index, radio luminosity and power. The radio spectrum of the majority of XRGs and ZRGs is steep (α 1400 > 0.5), which is typical of lobe dominated radio galaxies. The statistical studies are done on the relative size of the major and minor axes and the angle betwe...
Hybrid Morphology Radio Sources (HyMoRS) are a very rare and newly discovered subclass of radio g... more Hybrid Morphology Radio Sources (HyMoRS) are a very rare and newly discovered subclass of radio galaxies that have mixed FR morphology i.e., these galaxies have FR-I structure on one side of the core and FR-II structure on the other side of the core. We systematically searched for HyMoRS using VLA Faint Images of the Radio Sky at Twenty-cm (FIRST) survey at 1400 MHz and identified forty-five confirmed HyMoRS and five candidates HyMoRS. Our finding significantly increased the known sample size of HyMoRS. HyMoRS may play an essential role in understanding the interaction of jets with the interstellar medium and a very debated topic of the FR dichotomy. We identified optical/IR counterparts for thirty-nine sources in our catalogue. In our sample of sources, five sources had Quasar-like behavior. We had estimated the spectral index and radio luminosity of HyMoR sources in our catalogue, when possible. We found that the source J1336+2329 (logL = 26.93 W Hz−1sr−1) was the most luminous an...
The peculiar morphology of Head-Tail (HT) radio galaxies indicates strong interactions between th... more The peculiar morphology of Head-Tail (HT) radio galaxies indicates strong interactions between the radio jets and their intra-cluster medium. We systematically search for HT radio galaxies from LOFAR Two-metre Sky Survey first data release (LoTSS DR1) at 144 MHz frequency. We present here a catalogue of fifty new HT radio sources, among them, five are Narrow-Angle Tailed sources (NATs) and forty-five are Wide Angle Tailed sources (WATs). NATs are characterized by tails bent in a narrow ‘V’ like shape with less than a ninety-degree opening angle. For WAT radio galaxies, the opening angle between jets is more than ninety degrees which exhibit wide ‘C’ like morphologies. We found that thirty-one out of fifty HT sources are associated with known galaxy clusters. The various physical properties and statistical studies of these HT sources are also presented in this paper. Subject headings: galaxies: active – galaxies: jets – quasars: general – radio continuum: galaxies
The study of Head Tail (HT) radio galaxies track the information of associated galaxy clusters. W... more The study of Head Tail (HT) radio galaxies track the information of associated galaxy clusters. With the help of the VLA FIRST survey at 1.4 GHz, we detected 607 new HT radio sources, among them, 398 are Wide Angle Tail (WAT) and 216 are Narrow-Angle Tail (NAT) sources. NAT sources generally have ‘V’ shaped structure with an opening angle less than ninety degrees and for WAT sources opening angle between the jets is more than ninety degrees. We found that almost 80 per cent of our sources are associated with a known galaxy cluster. We mentioned various useful physical properties of these HT sources. Taking advantage of a large sample of newly discovered HT sources, various statistical studies have been done. The luminosity range of sources presented in the current paper is 10 ≤ L1.4GHz ≤ 10 erg sec−1. We identified optical counterparts for 193 WAT and 104 NAT sources. The sources are found up to redshift 2.08. Subject headings: galaxies: active – galaxies: formation – galaxies: jets...
Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of... more Winged radio sources are a small sub-class of extragalactic radio sources which display a pair of low surface brightness radio lobes, known as 'wings' aligned at a certain angle with the primary jets. Depending on the location of wings, these galaxies look like X or Z and are known as X-shaped Radio Galaxy (XRG) or Z-shaped Radio Galaxy (ZRG). We report the identification of 33 winged radio sources from the LOFAR Two-metre Sky Survey First Data Release (LoTSS DR1) out of which 21 sources are identified as X-shaped radio galaxies and 12 as Z-shaped radio galaxies. Optical counterparts are identified for 14 XRGs (67 per cent) and 12 ZRGs (100 per cent). We studied various physical parameters of these sources like spectral index, radio luminosity and power. The radio spectrum of the majority of XRGs and ZRGs is steep (α 144 1400 > 0.5), which is typical of lobe dominated radio galaxies. The statistical studies are done on the relative size of the major and minor axes and the angle between the major axis and minor axis for XRGs.
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Papers by Shobha Kumari