Conference Presentations by R. Sethuram
Papers by R. Sethuram
AIP Conference Proceedings, 2015
Active galaxies have powerhouses of radiation in their nuclear regions that are driven by accreti... more Active galaxies have powerhouses of radiation in their nuclear regions that are driven by accreting supermassive black holes. The accretion system also generates outflows of ionized gas and synchrotron-emitting bipolar jets of plasma, which could have a significant impact on the host galaxy. We have initiated an investigation into the physics of nearby active galaxies by studying the morphology, kinematics, excitation abundance structure, and radio structure of about 120 nearby targets. We present a few early results from this investigation.
Bulletin of the …, 2005
Emission-line stars in young open clusters are identified to study their properties, as a functio... more Emission-line stars in young open clusters are identified to study their properties, as a function of age, spectral type and evolutionary state. 207 open star clusters were observed using the slitless spectroscopy method and 157 emission stars were identified in 42 clusters. We have found 54 new emission-line stars in 24 open clusters, out of which 19 clusters are found to house emission stars for the first time. The Classical Be (CBe) stars are located all along the main sequence (MS) in the optical colour magnitude diagram (CMD) of clusters of all ages, which indicates that the Be phenomenon is unlikely only due to core contraction near the turn-off. A spectroscopic study of 152 CBe stars in 42 young open clusters was performed using medium resolution spectra in 3700−9000 Å range, to understand the Be phenomenon. Stars in the B0−B2 spectral bin are found be spun up towards the end of their MS life time, suggesting that early type stars evolve to become Be stars. Similar variation in properties were not found for stars in the later spectral types (B4−A0), suggesting that the Be phenomenon differs in early type and late type stars. Spectroscopic studies were done for the identified Herbig Ae/Be (HAeBe) stars. The star formation history of the hosting cluster was estimated by identifying pre-MS stars. The ages of HAeBe stars were estimated. The duration of star formation in the hosting cluster were found to be about 10 Myr.
Monthly Notices of the Royal Astronomical Society, 2018
JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium ... more JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium of galaxies in the local Universe. As part of the survey we perform 850 μm continuum measurements with SCUBA-2 for a representative sample of 193 Herschel-selected galaxies with M * > 10 9 M , as well as integrated CO(2-1) line fluxes with RxA3m for a subset of 90 of these galaxies. The sample is selected from fields covered by the Herschel-ATLAS survey that are also targeted by the MaNGA optical integral-field spectroscopic survey. The new JCMT observations combined with the multiwavelength ancillary data will allow for the robust characterization of the properties of dust in the nearby Universe, and the benchmarking of scaling relations between dust, gas, and global galaxy properties. In this paper we give an overview of the survey objectives and details about the sample selection and JCMT observations, present a consistent 30-band UV-to-FIR photometric catalogue with derived properties, and introduce
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Conference Presentations by R. Sethuram
Papers by R. Sethuram