Analysis NGC1275 Dec 2022 w IRF interpolation Priyadarshi

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NGC 1275 December 2022

General information

  • Name of the source: NGC 1275, Perseus A, 3C 84
  • Brief description of the source:
    • Seyfert 2 Galaxy
    • z = 0.0175
    • RA: 3 19 48.16 (hh mm ss), Dec: +41 30 42.1088 (dd mm ss)
    • RA, Dec in deg (ICRS): 49.95066663, 41.5116969
  • Analysis by Chaitanya Priyadarshi ((IFAE - cpriyadarshi@ifae.es)

Data-taking information

  • Dates of data-taking: 20221220
    • 20221220 (1.34 h)
      • ZD range (deg): [34.61, 51.48]
      • AZ range (deg): [-59.00, 56.85]
      • Runs: 11522, 11528 - 11531
      • Joint observations with MAGIC? : No

Monte Carlo information

For getting a closer data-MC comparison, we produce MC data along various sky positions (nodes) as a preliminary method to facilitate a better Random Forest model for the reconstruction and to interpolate IRFs from various sky positions to the target position of each Observation Run.

DL1 data

This includes whether you use LSTOSA, specific versions of lstchain, dllab scripts, cleaning levels, and calibration information.


DL1a files produced by LSTOSA (lstchain v0.9)

  • original real DL1a data
/fefs/aswg/data/real/DL1/{Date}/v0.9/tailcut84/
  • lstchain v0.9 tailcut8-4 (with cleaning based on pedestal RMS, dynamical cleaning)
 /fefs/aswg/data/real/DL1/20221220/v0.9/tailcut84/log/lstchain_config_v0.9.4_from2022onwards_heuristic.json
  • MC nodes: tailcut8-4 (with cleaning based on pedestal RMS), dynamic cleaning, NSB tuning
 /fefs/aswg/data/mc/DL1/AllSky/20221104_src3_dec3476_4822_tuned/{Testing, Training}Dataset/

Random forest

Here we use the TrainingDataset nodes, selected along the declination path (or closer to) of the selected source (BL Lac here). The "dec3476" part in the production ID refers to the declination angle of +34.76 deg and similarly for "4822". We have combined the Training nodes of the 2 declination lines to have a better RF model for the declination path of the source NGC 1275.

In this new RF model production, we include zenith and azimuth pointing parameters as well.

  • lstchain v0.9.13dev source-independent, dynamic cleaning, NSB tuning on BL Lac,
 /fefs/aswg/workspace/seiya.nozaki/BLLac_paper/20221104_src3_dec3476_4822_tuned/merged/srcindep/RF/trained_models/

For IRF interpolation

Here we create an almost uniform grid of nodes of sky positions for TestingDataset MC, so as to facilitate IRF interpolation in the parameter space of cos zenith and the sin of angle (delta) between the geomagnetic field and the particle shower direction. IRF interpolation is performed using pyirf v0.7.

  • Link to MC DL2 files used:

/fefs/aswg/workspace/seiya.nozaki/BLLac_paper/20221104_src3_dec3476_4822_tuned/merged/srcindep/DL2_MC/data/

  • Particle types: ring-wobble gamma (offset range = [0.3999, 0.4001] deg)

Source pointings Run 11522 11531.png

DL2 data

The DL2 files of the real data are stored here - /fefs/aswg/workspace/chaitanya.priyadarshi/real_data/AGN/NGC1275/v09x/tailcut84/DL2/real/src_indep/20221104_dec3476_4822_tuned/{Date}

DL3 data selection

For energy-dependent cuts

Information about your DL3 data selection.

  • intensity > 50
  • r: [0, 1]
  • wl: [0.01, 1]
  • leakage_intensity_width_2: [0, 1]
  • source-independent
    • gh_efficiency: 0.8
    • theta_containment: 0.8

Off regions Run 11522 11531 w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

  • Energy-dependent Gammaness and Theta cut distribution

Gammaness cuts all Run 11522 11531.png Rad max all Run 11522 11531.png

High-level analysis

  • lstchain Tools to generate source-independent IRF and DL3
  • Science Tool: gammapy 1.0
  • point-like IRF, 1D analysis

For DL3 data reduction to DL4 dataset,

  • OFF regions selected - 2 Wobble
  • Excluded region: IC 310, circular region with radius 0.3 deg
  • Safe Energy mask for systematics - Yes
  • Energy axes -
    • True: 10 GeV to 100 TeV with 5 bins per decade
    • Reco: 10 GeV to 100 TeV with 5 bins per decade

For spectral analysis,

  • Model used - Power Law + EBL (Dominguez)
  • Reference energy used by calculating the decorrelation energy with a Power Law fit, 366 GeV
  • Spectral Fit energy range - 39.8 GeV to 100 TeV with 5 bins per decade
  • Spectral fit with gammapy default optimization - minuit

For LC,

  • E_min = 100 Gev

Analysis Results

Cross-check with Crab Nebula

Analysis_Crab_Nebula_Dec_2022_w_IRF_interpolation_Priyadarshi

Theta2 plot

  • Single energy bin

Theta2 counts NGC1275 5 wob obs Run 11522 to 11531 1 en bins cut 04 std.png Theta2 excess NGC1275 5 wob obs Run 11522 to 11531 1 en bins cut 04 std.png

  • 5 bins per decade in energy

Theta2 counts NGC1275 5 wob obs Run 11522 to 11531 20 en bins cut 04 std.png Theta2 excess NGC1275 5 wob obs Run 11522 to 11531 20 en bins cut 04 std.png

Significance map

Excess map

Spectral results

For energy-dependent cuts

  • 20 Dec dataset

Preliminary LC and SED

  • Intrinsic spectrum: Power Law

Model parameters correlation Run 11522 11531 pl ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

Model parameters Run 11522 11531 pl ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

LC min 100 max 100000 Run 11522 11531 pl ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

SED 2 Run 11522 11531 pl ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

  • Intrinsic spectrum: Log Parabola

Model parameters correlation Run 11522 11531 lp ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

Model parameters Run 11522 11531 lp ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

LC min 100 max 100000 Run 11522 11531 lp ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png

SED 2 Run 11522 11531 lp ebl dominguez w safe en mask min 39.8 GeV 2 off 5 energy bin p dec.png