• Host galaxy magnitude of OJ 287 from its colours at minimum light 

  Valtonen, Mauri J; Dey, Lankeswar; Zola, S; Ciprini, S; Kidger, M; Pursimo, T; Gopakumar, A; Matsumoto, K; Sadakane, K; Caton, D. B; Nilsson, K; Komossa, S; Bagaglia, M; Baransky, A; Boumis, P; Boyd, D; Castro-Tirado, A. J; Debski, B; Drozdz, M; Perez, A. Escartin; Fiorucci, M; Garcia, F; Gazeas, K; Ghosh, S; Godunova, V; Gomez, J. L; Gredel, R; Grupe, D; Haislip, J. B; Henning, T; Hurst, G; Janík, J; Kouprianov, V. V; Lehto, H; Liakos, A; Mathur, S; Mugrauer, M; Nogues, R. Naves; Nucciarelli, G; Ogloza, W; Ojha, D. K; Pajdosz-Śmierciak, U; Pascolini, S; Poyner, G; Reichart, D. E; Rizzi, N; Roncella, F; Sahu, D. K; Sillanpää, A; Simon, A; Siwak, M; Alfaro, F. C. Soldán; Sonbas, E; Tosti, G; Vasylenko, V; Webb, J. R; Zielinski, P (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)

  OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum light when the AGN activity is so low that ...
• Growth of disc-like pseudo-bulges in SDSS DR7 since z = 0.1 

  Ankit Kumar; Kataria, Sandeep Kumar (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)

  Cosmological simulations predict more classical bulges than their observational counterparts in the local Universe. Here, we quantify evolution of the bulges since z = 0.1 using photometric parameters of nearly 39 000 ...
• Radio Evolution of a Type IIb Supernova SN 2016gkg 

  Nayana, A. J; Chandra, Poonam; Krishna, Anoop; Anupama, G. C (American Astronomical Society, 2022-08-01)

  We present extensive radio monitoring of a Type IIb supernova (SN IIb), SN 2016gkg during t ∼ 8−1429 days postexplosion at frequencies ν ∼ 0.33−25 GHz. The detailed radio light curves and spectra are broadly consistent with ...
• Properties of ubiquitous magnetic reconnection events in the lower solar atmosphere 

  Joshi, Jayant; Rouppe van der Voort, Luc H. M (EDP Sciences, 2022-08)

  Context. Magnetic reconnection in the deep solar atmosphere can give rise to enhanced emission in the Balmer hydrogen lines, a phenomenon referred to as Ellerman bombs. Recent high-quality Hβ observations indicate that ...
• Implications of an Extended Dark Energy Model with Massive Neutrinos 

  Sharma, Ravi Kumar; Pandey, Kanhaiya L; Das, Subinoy (American Astronomical Society, 2022-08-01)

  Recently there have been reports of finding a lower bound on the neutrino mass parameter (Σmν) when using the Atacama Cosmology Telescope (ACT) and SPTpol data; however, these bounds on the Σmν are still weaker for most ...
• Galactic Chemical Evolution of Exoplanet Hosting Stars: Are High-mass Planetary Systems Young? 

  Swastik, C; Banyal, R. K; Narang, Mayank; Manoj, P; Sivarani, T; Rajaguru, S. P; Athira Unni; Banerjee, Bihan (American Astronomical Society, 2022-08-01)

  The imprints of stellar nucleosynthesis and chemical evolution of the galaxy can be seen in different stellar populations, with older generation stars showing higher α-element abundances and the later generations ...
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow 

  Das, Santabrata; Nandi, Anuj; Stalin, C. S; Rakshit, Suvendu; Dihingia, Indu Kalpa; Singh, Swapnil; Aktar, Ramiz; Mitra, Samik (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)

  We study the relativistic, inviscid, advective accretion flow around the black holes and investigate a key feature of the accretion flow, namely the shock waves. We observe that the shock-induced accretion solutions are ...
• The role of magnetic fields in the stability and fragmentation of filamentary molecular clouds: two case studies at OMC-3 and OMC-4 

  Li, Pak Shing; Lopez-Rodriguez, Enrique; Archana Soam; Klein, Richard I (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)

  We present the stability analysis of two regions, OMC-3 and OMC-4, in the massive and long molecular cloud complex of Orion A. We obtained 214 μm HAWC + /SOFIA polarization data, and we make use of archival data for the ...
• Spectroscopic Study of Four Metal-poor Carbon Stars from the Hamburg/ESO Survey: On Confirming the Low-mass Nature of Their Companions* 

  Shejeelammal, J; Goswami, A (American Astronomical Society, 2022-08-01)

  Elemental abundances of extrinsic carbon stars provide insight into the poorly understood origin and evolution of elements in the early Galaxy. In this work, we present the results of a detailed spectroscopic analysis of ...
• The X-Ray and Radio Loud Fast Blue Optical Transient AT2020mrf: Implications for an Emerging Class of Engine-driven Massive Star Explosions 

  Yao, Yuhan; Ho, Anna Y. Q; Medvedev, Pavel; Nayana, A. J; Perley, Daniel A; Kulkarni, S. R; Chandra, Poonam; Sazonov, Sergey; Gilfanov, Marat; Khorunzhev, Georgii; Khatami, David K; Sunyaev, Rashid (American Astronomical Society, 2022-08-01)

  We present AT2020mrf (SRGe J154754.2+443907), an extra-galactic (z = 0.1353) fast blue optical transient (FBOT) with a rise time of tg,rise = 3.7 days and a peak luminosity of Mg,peak = −20.0. Its optical spectrum ...
• Nature of helicity injection in non-erupting solar active regions 

  Vemareddy, P (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)

  Using time-sequence vector magnetic field and coronal observations from Solar Dynamics Observatory, we report the observations of the magnetic field evolution and coronal activity in four emerging active regions (ARs). ...
• Flux and spectral variability of Mrk 421 during its moderate activity state using NuSTAR: Possible accretion disc contribution? 

  Mondal, S; Priyanka Rani; Stalin, C. S; Chakrabarti, S. K; Rakshit, S (EDP Sciences, 2022-07)

  Context. The X-ray emission in BL Lac objects is believed to be dominated by synchrotron emission from their relativistic jets. However, when the jet emission is not strong, one could expect signatures of X-ray emission ...
• Accretion disc sizes from continuum reverberation mapping of AGN selected from the ZTF survey 

  Jha, Vivek Kumar; Joshi, Ravi; Chand, Hum; Wu, Xue-Bing; Ho, Luis C; Rastogi, Shantanu; Ma, Qinchun (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)

  We present the accretion disc-size estimates for a sample of 19 active galactic nuclei (AGNs) using the optical g-, r-, and i-band light curves obtained from the Zwicky Transient Facility survey. All the AGNs have reliable ...
• Probing infrared excess connection with Li enhancement among red clump giants 

  Mallick, Anohita; Reddy, B. E; Muthumariappan, C (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)

  We have performed a search among low-mass red giants for finding evidence for merger scenario for triggering He-flash and subsequent Li enhancement. We chose a sample of red giants from GALAH survey with well-measured Li ...
• Quasi-periodic spicule-like cool jets driven by Alfvén pulses 

  Singh, B; Srivastava, A. K; Sharma, K; Mishra, S. K; Dwivedi, B. N (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)

  We perform a 2.5D magnetohydrodynamic simulation to gain a comprehensive understanding of the formation of spicule-like cool jets caused by initial transverse velocity pulses akin to Alfven´ pulses in the solar chromosphere. ...
• Formation and Abundance of Late-forming Primordial Black Holes as Dark Matter 

  Chakraborty, Amlan; Chanda, Prolay K; Pandey, Kanhaiya L; Das, Subinoy (American Astronomical Society, 2022-06-20)

  We propose a novel mechanism where primordial black hole (PBH) dark matter is formed much later in the history of the universe, between the epochs of Big Bang nucleosynthesis and cosmic microwave background photon decoupling. ...
• Circular Polarization Observations of Type II Solar Radio Bursts and the Coronal Magnetic Field 

  Ramesh, R; Kathiravan, C; Ebenezer, E (American Astronomical Society, 2022-06-10)

  It is well known that magnetic field strength (B) in the solar corona can be calculated using the Alfvén Mach number (MA) and Alfvén speed (vA) of the magnetohydrodynamic shock waves associated with coronal type II radio ...
• In Search of Short Gamma-Ray Burst Optical Counterparts with the Zwicky Transient Facility 

  Ahumada, Tomás; Anand, Shreya; Coughlin, Michael W; Andreoni, Igor; Kool, Erik C; Kumar, Harsh; Reusch, Simeon; Sagués-Carracedo, Ana; Stein, Robert; Cenko, Bradley S; Kasliwal, Mansi M; Singer, Leo P; Dunwoody, Rachel; Mangan, Joseph; Bhalerao, Varun; Bulla, Mattia; Burns, Eric; Graham, Matthew J; Kaplan, David L; Perley, Daniel; Almualla, Mouza; Bloom, Joshua S; Cunningham, Virginia; De, Kishalay; Gatkine, Pradip; Ho, Anna Y. Q; Karambelkar, Viraj; Kong, Albert K. H; Yao, Yuhan; Anupama, G. C; Barway, Sudhanshu; Ghosh, Shaon; Itoh, Ryosuke; McBreen, Sheila; Bellm, Eric C; Fremling, Christoffer; Laher, Russ R; Mahabal, Ashish A; Riddle, Reed L; Rosnet, Philippe; Rusholme, Ben; Smith, Roger; Sollerman, Jesper; Bissaldi, Elisabetta; Fletcher, Corinne; Hamburg, Rachel; Mailyan, Bagrat; Malacaria, Christian; Roberts, Oliver (American Astronomical Society, 2022-06-10)

  The Fermi Gamma-ray Burst Monitor (GBM) triggers on-board in response to ∼40 short gamma-ray bursts (SGRBs) per year; however, their large localization regions have made the search for optical counterparts a challenging ...
• NuSTAR spectral analysis of three Seyfert galaxies: NGC 3227, NGC 5548, and MR 2251−178 

  Pal, Indrani; Stalin, C. S; Mallick, L; Priyanka Rani (EDP Sciences, 2022-06)

  Context. The observed nuclear X-ray emission in the radio-quiet category of active galactic nuclei (AGN) is believed to be from a compact region, the corona, which is situated in the vicinity of central supermassive black ...
• Variable mass accretion and failed wind explain changing-look phenomena in NGC 1365 

  Mondal, Santanu; Adhikari, T. P; Hryniewicz, K; Stalin, C. S; Pandey, Ashwani (EDP Sciences, 2022-06)

  Changing-look active galactic nuclei (CLAGNs) show a complex nature in their X-ray spectral shape and line-of-sight column-density variation. The physical mechanisms responsible for these variations are unclear. Here, we ...

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