NGC 1275

General information

• Name of the source: NGC 1275
• Brief description of the source:

- Object type : FR-I Radio Galaxy + Spiral galaxy (in interaction)

- RA: 3 19 48.16 (hh mm ss), Dec: +41 30 42.1088 (dd mm ss)

NGC 1275 data analysis

Related analysis pages

Analysis_NGC1275_Dec_2022_w_IRF_interpolation_Priyadarshi (Dec 2022, source-independent, IRF interpolation, energy-dependent cuts. Dec 20 flare for ATel https://www.astronomerstelegram.org/?read=15819 )

Analysis_NGC1275_Dec_2022_source_dep_Nozaki (Dec 20 Flare, source-dependent, IRF interpolation, energy-dependent cuts for ATel https://www.astronomerstelegram.org/?read=15819 )

Cycle I (including major flare Dec 2022)

Mireia

• Producer: Mireia Nievas Rosillo <mnievas@iac.es>

Data acquisition

(below some key points from Abelardo's old datacheck selection notebook, only showing those relevant for data selection)

• ZD and AZ distributions

• NSB vs moon altitude and vs run number

• Rate of cosmics

• Rate of pulses above a given pulse size

• NSB after all cuts

Data selection

• 204 wobble runs for the selected source (out of 246)
• Observation time: 53.56 hours (out of 65.53 hours)
• (most data in Perseus-MA mode, shared with IC310, some runs in NGC1275 pointing mode)
• (moon data is removed)

1 : 2022-12-20 : [11522, 11528, 11529, 11530, 11531, 11532, 11522, 11528, 11529, 11530, 11531, 11532]
2 : 2022-12-21 : [11546, 11547, 11548, 11549, 11550]
3 : 2022-12-22 : [11566, 11568, 11569, 11570, 11571, 11572, 11573, 11574, 11566, 11568, 11569, 11570, 11571, 11572, 11573, 11574]
4 : 2022-12-23 : [11595, 11596, 11597, 11598, 11599, 11600]
5 : 2023-01-13 : [11618, 11619]
6 : 2023-01-14 : [11641, 11642, 11643, 11644, 11641, 11642, 11643, 11644]
7 : 2023-01-15 : [11660, 11661, 11662, 11663, 11660, 11661, 11662, 11663]
8 : 2023-08-15 : [13935, 13936, 13937, 13938, 13939, 13940, 13941, 13942, 13943, 13944]
9 : 2023-08-17 : [13987, 13988, 13989, 13990, 13991, 13992, 13993, 13994, 13995, 13996]
10 : 2023-08-18 : [14020, 14021, 14022, 14023]
11 : 2023-08-20 : [14069, 14070, 14071, 14072, 14073]
12 : 2023-08-21 : [14093, 14094, 14095, 14096, 14097, 14098, 14099, 14100]
13 : 2023-09-11 : [14258]
14 : 2023-09-16 : [14456]
15 : 2023-09-18 : [14495]
16 : 2023-09-19 : [14590]
17 : 2023-09-20 : [14623, 14624, 14625, 14626]
18 : 2023-09-21 : [14668, 14669]
19 : 2023-09-22 : [14700, 14701, 14702, 14703, 14704]
20 : 2023-09-23 : [14712, 14713, 14715, 14718, 14719, 14720, 14721]
21 : 2023-09-24 : [14731, 14732, 14733, 14736, 14737, 14738]
22 : 2023-10-09 : [15010, 15011, 15012, 15013, 15014, 15015, 15016, 15017]
23 : 2023-10-10 : [15039, 15040]
24 : 2023-10-11 : [15070, 15071, 15072, 15073, 15074]
25 : 2023-10-12 : [15117, 15118, 15119, 15120]
26 : 2023-11-08 : [15321, 15322, 15323, 15324, 15325, 15326, 15327]
27 : 2023-11-10 : [15401, 15402, 15403, 15404, 15405, 15406, 15407]
28 : 2023-11-11 : [15436, 15437, 15438]
29 : 2023-11-12 : [15470, 15471, 15472, 15473]
30 : 2023-11-16 : [15627, 15628, 15629, 15630, 15631]
31 : 2023-11-17 : [15660, 15661, 15662, 15663, 15664]
32 : 2023-11-19 : [15739, 15740, 15741]
33 : 2023-12-01 : [15786, 15787, 15788]
34 : 2023-12-08 : [15889, 15890, 15891, 15892, 15893]
35 : 2024-01-29 : [16423, 16424, 16425, 16426]
36 : 2024-01-30 : [16438, 16439, 16440, 16441, 16442]
37 : 2024-02-02 : [16492, 16493, 16494, 16495, 16496, 16497, 16498, 16499, 16500, 16501, 16502, 16503]
 

Analysis details

Software and analysis notebook:

• Files (inc. provence): /fefs/aswg/workspace/mireia.nievas/NGC1275
• Pipeline: /fefs/aswg/workspace/mireia.nievas/NGC1275/NGC1275_to_DL3.ipynb
• lstchain: v0.10.5 originally, v0.10.7 now.
• gammapy: 1.1
• ctapipe: 0.19.2
• astropy: 5.3.4

Source:

• Coordinates: RA=49.95066663, DEC=41.5116969 (solved with astropy's SkyCoord / CDS name resolver)
• Closest (chosen) dec track: 48.22 deg.
• Cleaning: default, tail-cuts 8-4.
• Analysis type: source-independent
• IRFs: point-like, energy-dependent gammaness/theta2 cuts

Starting points:

• MC: DL2
• Models
• Data: DL1b (merged files with no images)

Results

Analysis details

• Total significance (per energy bin)

• December flare

• January flare

(note that the highest flux night was with Moon, so not included for now)

720px

• Post-flare

720px

• Per bayesian block bin (from LC analysis, see below)

Theta2 plots for different bayesian blocks

BB0	BB1
BB2	BB3
BB4	BB5
BB6

Light Curve

SED

• Average

• Flux-Binned SED

(from the 2nd plot, I show also the previous state for comparison)

• December

720px

• January

720px

Bayesian blocks from the flux in the run-wise Light Curve to define flux bins, then computing one SED per block.

• Fermi+LST