J/A+A/681/A7 UVIT FUV image for NGC 1512 (Robin+, 2024)
What drives the wheels of evolution in NGC 1512? A UVIT study.
Robin T., Kartha S.S., Ujjwal K., Saha K., Parekh V., George K., Mathew B.
<Astron. Astrophys. 681, A7 (2024)>
=2024A&A...681A...7R 2024A&A...681A...7R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Ultraviolet
Keywords: galaxies: spiral - galaxies: interaction - galaxies: star formation
Abstract:
Environmental and secular processes play a pivotal role in the
evolution of galaxies. These can be due to external processes
such as interactions or internal processes due to the action of bar,
bulge and spiral structures. Ongoing star formation in spiral galaxies
can be affected by these processes. By studying the star formation
progression in the galaxy, we can gain insights into the role of
different processes that regulate the overall evolution of a galaxy.
The ongoing interaction between barred-spiral galaxy NGC 1512 and its
satellite NGC 1510 offers an opportunity to investigate how galactic
interactions and the presence of a galactic bar influence the
evolution of NGC 1512. We aim to understand the recent star formation
activity in the galaxy pair and thus gain insight into the evolution
of NGC 1512.
The UltraViolet Imaging Telescope (UVIT) onboard AstroSat enables us
to characterize the star-forming regions in the galaxy with a superior
spatial resolution of ∼85pc in the galaxy rest frame. We identified
and characterized 175 star-forming regions in the UVIT FUV image of
NGC 1512 and correlated with the neutral hydrogen (Hi) distribution.
Extinction correction was applied to the estimated photometric
magnitude.We traced the star-forming spiral arms of the galaxy and
studied the star formation properties across the galaxy in detail.
We detected localized regions of star formation enhancement and
distortions in the galactic disk. We found this to be consistent with
the distribution of Hi in the galaxy. This is evidence of past and
ongoing interactions affecting the star formation properties of the
galaxy. We studied the properties of the inner ring. We find that the
regions of the inner ring show maximum star formation rate density
(log(SFRDmean[M☉/yr/kpc2])~-1.7) near the major axis of
the bar, hinting at a possible crowding effect in these regions. The
region of the bar in the galaxy is also depleted of UV emission. This
absence suggests that the galactic bar may have played an active role
in the redistribution of gas and quenching of star formation inside
identified bar region. Hence, we suggest that both the secular and
environmental factors might be influencing the evolution of NGC 1512.
Description:
UVIT observed the galaxy pair of NGC 1512/1510 in FUV and NUV channels
(PI: Kanak Saha, Obs. ID: G07_068). NGC 1512 has been observed in
broadband filters of F154W (FUV, hereafter) and N242W (NUV, hereafter)
on 30 Aug 2017.
Objects:
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RA (2000) DE Designation(s)
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04 03 54.28 -43 20 55.8 NGC 1512 = ESO 250-4
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 105 1 Information on fits image
fits/* . 1 fits image
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 39 A10 "datime" Obs.date Observation date
41- 46 I6 Kibyte size Size of FITS file
48- 77 A30 --- FileName Name of FITS file, in subdirectory fits
79-105 A27 --- Title Title of the FITS file
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Acknowledgements:
Robin Thomas, robin.thomas(at)christuniversity.in
(End) Patricia Vannier [CDS] 31-Aug-2023