Coordinated visible and infrared monitoring of rapid variations of Markarian 501 - First results with FOVIA

Bibcode
1992A&AS...93....1K
Kidger, M. R.; de Diego, J. A.
Bibliographical reference

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 93, April 1992, p. 1-10.

Advertised on:
4
1992
Number of authors
2
IAC number of authors
2
Citations
10
Refereed citations
9
Description
The paper presents simultaneous monitoring of the BL Lacertae object Markarian 501 obtained in the visible and near infrared using a double photometer system on the 1.5 m Carlos Sanchez Telescope situated in El Observatorio del Teide (Tenerife) and CCD photometry in U and B taken with the 1 m Jacobus Kapteyn Telescope of El Observatorio del Roque de los Muchachos (La Palma). Evidence is seen of coordinated variability on time scales of hours in the variations in the visible and infrared. A brief infrared flare is seen on one night which has a formal probability of reality of approximately 99 percent and which is not seen in the B light curve. If real, this flare presents considerable difficulties with the framework of existing models. The results demonstrate the value of having a single telescope equipped to observe simultaneously in two different ranges of the spectrum. These data are compared with CCD photometry in U and B taken at other epochs.
Type
Refereed
BL Lacertae objects
Infrared photometry
Markarian galaxies

It may interest you

  • Refereed
    Characterisation at Cryogenic Temperatures of an Attenuator for an Application of Astrophysical Instrumentation with MKIDs
    The use of non-cryogenic certified commercial electronics for cryogenic applications may be attractive due to their cost and availability, but it also carries risks related to reliability, performance and thermal compatibility. The decision to use commercial components that are not certified for cryogenics instead of components specifically
    Rodríguez Ramos L.F. et al.

    Advertised on:

    12
    2024
  • Refereed
    The return of FarNet-II: Generation of solar far-side magnetograms from helioseismic data
    Context. The far-side activity of the Sun can be inferred by interpreting the near-side wave field using local helioseismic techniques. However, detections are limited to strongly active regions because signal-to-noise ratio of the data is low. Recently, we developed the FarNet and FarNet-II neural networks to improve the identification of active
    Broock, E. G. et al.

    Advertised on:

    12
    2024
    Bibcode
    2024A&A...692A.182B
    Citations
    0
  • Refereed
    Non-local thermodynamic equilibrium inversions of the Si I 10827 Å spectral line
    Inferring the coupling of different atmospheric layers requires observing spectral lines sensitive to the atmospheric parameters, particularly the magnetic field vector, at various heights. The best way to tackle this goal is to perform multi-line observations simultaneously. For instance, the new version of the Gregor Infrared Spectrograph
    Quintero Noda, C. et al.

    Advertised on:

    12
    2024
    Bibcode
    2024A&A...692A.169Q
    Citations
    0