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22 papers · 2 filters
A survey of Ly emission around Damped Ly absorbers at with the Keck Cosmic Web Imager
Grecco A. Oyarzun, Marc Rafelski, Nissim Kanekar +3
We present Keck Cosmic Web Imager (KCWI) Ly integral field spectroscopy of the fields surrounding 14 Damped Ly absorbers (DLAs) at . Of these 14 DLAs, 9 have hig…
Constraining the geometry of the reflection nebula NGC 2023 with [O I]: Emission & Absorption
Bhaswati Mookerjea, Goeran Sandell, Rolf Guesten +3
We have mapped the NGC 2023 reflection nebula in the 63 and 145 micron transitions of [O I] and the 158 micron [C II] spectral lines using the heterodyne receiver upGREAT on SOFIA.…
Parsec scales of carbon chain and complex organic molecules in AFGL 2591 and IRAS 20126
P. Freeman, S. Bottinelli, R. Plume +3
(Abridged) There is a diverse chemical inventory in protostellar regions leading to the classification of extreme types of systems. Warm carbon chain chemistry sources, for one, ar…
Star formation history of mass-selected galaxies in the ELAIS-N1 Field
E. F. Ocran, M. Vaccari, J. M. Stil +3
We measure the specific star formation rates of \textit{K}-band selected galaxies from the ELAIS-N1 by stacking GMRT data at 610 MHz. We identify a sample of SFGs, spanning $\rm{0.…
XQR-30: Black Hole Masses and Accretion Rates of 42 z>6 Quasars
C. Mazzucchelli, M. Bischetti, V. D'Odorico +19
We present bolometric luminosities, black hole masses and Eddington ratios for 42 luminous quasars at z>6 using high signal-to-noise ratio VLT/X-Shooter spectra, acquired in the en…
XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
Valentina D'Odorico, E. Banados, G. D. Becker +46
The final phase of the reionization process can be probed by rest-frame UV absorption spectra of quasars at z>6, shedding light on the properties of the diffuse intergalactic mediu…
Dependence of galactic bars on the tidal density field in the SDSS
Qi'an Deng, Ying Zu, Shadab Alam +1
As a key driver of the secular evolution of disc galaxies, bar formation is potentially linked to the surrounding tidal field. We systematically investigate the dependence of bars…
Investigating the OH-H2 relation in diffuse Galactic clouds
Katherine Rawlins, Bhaswati Mookerjea
We investigate the correlation between OH and H2 column densities in diffuse Galactic clouds, in order to identify potential molecular tracers of interstellar H2. For this, we anal…
AFGL 5180 and AFGL 6366S: sites of hub-filament systems at the opposite edges of a filamentary cloud
A. K. Maity, L. K. Dewangan, N. K. Bhadari +3
We present a multi-scale and multi-wavelength study to unveil massive star formation (MSF) processes around sites AFGL 5180, and AFGL 6366S, both hosting a Class II 6.7 GHz methano…
Spectral age distribution for radio-loud active galaxies in the XMM-LSS field
Siddhant Pinjarkar, Martin J. Hardcastle, Jeremy J. Harwood +5
Jets of energetic particles, as seen in FR type-I and FR type-II sources, ejected from the center of Radio-Loud AGN affect the sources surrounding intracluster medium/intergalactic…
New quasar proximity zone size measurements at using the enlarged XQR-30 sample
Sindhu Satyavolu, Anna-Christina Eilers, Girish Kulkarni +15
Proximity zones of high-redshift quasars are unique probes of their central supermassive black holes as well as the intergalactic medium in the last stages of reionization. We pres…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z=6.61 Quasar
Feige Wang, Jinyi Yang, Joseph F. Hennawi +56
We present the first results from the JWST ASPIRE program (A SPectroscopic survey of biased halos In the Reionization Era). This program represents an imaging and spectroscopic sur…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of Quasars Using JWST
Jinyi Yang, Feige Wang, Xiaohui Fan +53
Studies of rest-frame optical emission in quasars at have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (…
UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at ~ 0.35 kpc resolution
Rakhi R, Geethika Santhosh, Prajwel Joseph +14
NGC 5291, an early-type galaxy surrounded by a giant HI ring, is believed to be formed from collision with another galaxy. Several star forming complexes and tidal dwarf galaxies a…
Probing the Global Dust Properties and Cluster Formation Potential of the Giant Molecular Cloud G148.24+00.41
Vineet Rawat, M. R. Samal, D. L. Walker +8
Clouds more massive than about M are potential sites of massive cluster formation. Studying the properties of such clouds in the early stages of their evolution offe…
Radio spectral properties of star-forming galaxies between 150-5000MHz in the ELAIS-N1 field
Fangxia An, M. Vaccari, P. N. Best +9
By combining high-sensitivity LOFAR 150MHz, uGMRT 400MHz and 1,250MHz, GMRT 610MHz, and VLA 5GHz data in the ELAIS-N1 field, we study the radio spectral properties of radio-detecte…
UVIT observations of the Small Magellanic Cloud: Point source catalogue
Ashish Devaraj, Prajwel Joseph, C. S. Stalin +2
Three fields in the outskirts of the Small Magellanic Cloud were observed by the Ultra-Violet Imaging Telescope (UVIT) on board AstroSat, during 31 December 2017 and 01 January 201…
Structure and Kinematics of Sh2-138 -- A distant hub-filament system in the outer Galactic plane
Kshitiz Mallick, Lokesh Dewangan, Devendra Ojha +2
We present a molecular line study of the Sh2-138 (IRAS 22308+5812) hub-filament system with an aim to investigate its structure and kinematics. Archival CO molecular line data from…
Spiral Structure and Massive Star formation in the Hub-Filament-System G326.27-0.49
Bhaswati Mookerjea, V. S. Veena, Rolf Guesten +2
Hub-filament systems (HFSs) are potential sites of formation of star clusters and high mass stars. To understand the HFSs and to provide observational constraints on current theori…
Kronberger 55: A Candidate for End-dominated Collapse Scenario
Aayushi Verma, Saurabh Sharma, Lokesh Dewangan +5
Using optical photometric observations from 1.3m Devasthal Fast Optical Telescope and deep near-infrared (NIR) photometric observations from TANSPEC mounted on 3.6m Devasthal Optic…
Investigating the morphology and CO gas kinematics of Sh2-112 region
Kshitiz Mallick, Saurabh Sharma, Lokesh Dewangan +3
We present a study of the molecular cloud in Sh2-112 massive star forming region using the 3-2 transition of CO isotopologues - CO, 13CO, and C18O; supplemented in part by CGPS HI…
AGN Feedback Through Multiple Jet Cycles in the Seyfert Galaxy NGC 2639
Vaishnav V. Rao, Preeti Kharb, Rubinur K. +7
The Seyfert galaxy NGC 2639 was known to exhibit three episodes of AGN jet/lobe activity. We present here the upgraded Giant Metrewave Radio Telescope (uGMRT) 735 MHz image of NGC…