Near‐infrared photometry of superthin edge‐on galaxies

Abstract

Present AddressThis is sample for present address text this is sample for present address textWe perform near-infrared photometry of a large sample of 49 superthin edge-on galaxies. These galaxies are selected based on optical photometry because of high radial-to-vertical scale ratio in their stellar disks. The Near Infrared (NIR) H and K observations were conducted with the cryogenic-cooled camera ASTRONIR-CAM on the 2.5m telescope at the Caucasus Mountain Observatory of Lomonosov Moscow State University. A majority of galaxies in our sample show comparable or better photometric depth than the Sloan Digital Sky Survey (SDSS) optical images. We estimate the structural parameters of stellar disks in the galaxies and find that the NIR scale height of stellar disks is comparable to that estimated from the optical, SDSS , and , whereas the H and K scale length of the stellar disks is significantly shorter than in the , and . We investigate if a realistic distribution of dust alone can explain the difference in the scale length and find that in the majority of the galaxies the radial variation of the stellar population is actually responsible for the color distribution. The latter suggests a younger age of the disks periphery, and the inside out building up of stellar disks in the superthin galaxies.

Caucasian mountain observatory of Sternberg astronomical institute: six years of operation

“…-Variability and size-luminosity relation of AGNs (Oknyansky et al 2017;Ilić et al 2020;Cho et al 2020) -Study of variable stars associated with maser sources (Sobolev et al 2019) -Star-forming regions at the periphery of the supershell surrounding the Cyg OB1 association (Sitnik et al 2020(Sitnik et al , 2019Tatarnikova et al 2016) -Optical and NIR-photometry of X-ray sources with black holes, microquasars, pre-main sequence and post-AGB objects (Cherepashchuk et al 2019a,b) -Spectroscopy of an ultramassive white dwarf (Pshirkov et al 2020) -Colour and polarimetric variability of UXORs; young stellar object jets photometry (Dodin et al 2020a(Dodin et al , 2019Berdnikov et al 2017) -Analysis of temporal evolution of the circumstellar envelopes of evolved stars at high angular resolution (Safonov et al 2019b;Fedoteva et al 2020) -Spectral characterization of solar system bodies (Busarev et al 2018) -Near-infrared photometry of superthin edge-on galaxies (Bizyaev et al 2020) -Spectral characterization and identification of SRG/eRosita sources (Dodin et al 2020b) -High-accuracy monitoring of exoplanet transits (Benni et al 2020).…”

Spectral Observations of Superthin Galaxies

“…We targeted some of selected galaxies for NIR photometric observations (see below) and attempted to observe more objects to enhance the NIR sample in coordination with the sample by Bizyaev et al (2020).…”

“…The paper Bizyaev et al (2020) describes near infrared photometry of 49 galaxies from our list. We conducted additional observations of 18 galaxies with the NICFPS camera on the 3.5m telescope at the Apache Point Observatory (APO).…”

“…Flat fielding and image co-adding was done using the IRAF standard packages. Similar to Bizyaev et al (2020), we applied photometric calibration of the images via non-saturated stars in the fields identified also in the 2MASS survey. Typically we used seven stars in each field and applied the 2MASS-MKO transformation from Legget et al (2006).…”

“…Note that the names of the galaxies from the EGIS catalogue contain RA and Dec coordinates of their center in decimal degrees. In SDSS', hereafter EGIS 1 ) A part of these galaxies was observed in the near-infrared (NIR) by Bizyaev et al (2020).…”